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CFSDN坚持开源创造价值，我们致力于搭建一个资源共享平台，让每一个IT人在这里找到属于你的精彩世界.
这篇CFSDN的博客文章实例详解Android快速开发工具类总结由作者收集整理，如果你对这篇文章有兴趣，记得点赞哟.
1、日志工具类 Log.java 。
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public
class
L
{
private
L()
{
/* 不可被实例化 */
throw
new
UnsupportedOperationException(
"Cannot be instantiated!"
);
}
// 是否需要打印bug，可以在application的onCreate函数里面初始化
public
static
boolean
isDebug =
true
;
private
static
final
String TAG =
"DefaultTag"
;
// 下面四个是默认tag的函数
public
static
void
i(String msg)
{
if
(isDebug)
Log.i(TAG, msg);
}
public
static
void
d(String msg)
{
if
(isDebug)
Log.d(TAG, msg);
}
public
static
void
e(String msg)
{
if
(isDebug)
Log.e(TAG, msg);
}
public
static
void
v(String msg)
{
if
(isDebug)
Log.v(TAG, msg);
}
// 下面是传入自定义tag的函数
public
static
void
i(String tag, String msg)
{
if
(isDebug)
Log.i(tag, msg);
}
public
static
void
d(String tag, String msg)
{
if
(isDebug)
Log.i(tag, msg);
}
public
static
void
e(String tag, String msg)
{
if
(isDebug)
Log.i(tag, msg);
}
public
static
void
v(String tag, String msg)
{
if
(isDebug)
Log.i(tag, msg);
}
}
|
2、Toast统一管理类 Tost.java 。
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public
class
T
{
private
T()
{
/* cannot be instantiated */
throw new UnsupportedOperationException("cannot be instantiated");
}
public static boolean isShow = true;
/**
* 短时间显示Toast
*/
public static void showShort(Context context, CharSequence message)
{
if (isShow)
Toast.makeText(context, message, Toast.LENGTH_SHORT).show();
}
/**
* 短时间显示Toast
* @param message 要显示的字符串资源的id
*/
public static void showShort(Context context, int message)
{
if (isShow)
Toast.makeText(context, message, Toast.LENGTH_SHORT).show();
}
/**
* 长时间显示Toast
*/
public static void showLong(Context context, CharSequence message)
{
if (isShow)
Toast.makeText(context, message, Toast.LENGTH_LONG).show();
}
/**
* 长时间显示Toast
*/
public static void showLong(Context context, int message)
{
if (isShow)
Toast.makeText(context, message, Toast.LENGTH_LONG).show();
}
/**
* 自定义显示Toast时间
*/
public static void show(Context context, CharSequence message, int duration)
{
if (isShow)
Toast.makeText(context, message, duration).show();
}
/**
* 自定义显示Toast时间
*/
public
static
void
show(Context context,
int
message,
int
duration)
{
if
(isShow)
Toast.makeText(context, message, duration).show();
}
}
|
3、SharedPreferences封装类 SPUtils.java 和 PreferencesUtils.java 。
1. SPUtils.java 。
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public
class
SPUtils
{
/**
* 保存在手机里面的文件名
*/
public
static
final
String FILE_NAME =
"share_data"
;
/**
* 保存数据的方法，我们需要拿到保存数据的具体类型，然后根据类型调用不同的保存方法
*
* @param context
* @param key
* @param object
*/
public
static
void
put(Context context, String key, Object object)
{
SharedPreferences sp = context.getSharedPreferences(FILE_NAME,
Context.MODE_PRIVATE);
SharedPreferences.Editor editor = sp.edit();
if
(object
instanceof
String)
{
editor.putString(key, (String) object);
}
else
if
(object
instanceof
Integer)
{
editor.putInt(key, (Integer) object);
}
else
if
(object
instanceof
Boolean)
{
editor.putBoolean(key, (Boolean) object);
}
else
if
(object
instanceof
Float)
{
editor.putFloat(key, (Float) object);
}
else
if
(object
instanceof
Long)
{
editor.putLong(key, (Long) object);
}
else
{
editor.putString(key, object.toString());
}
SharedPreferencesCompat.apply(editor);
}
/**
* 得到保存数据的方法，我们根据默认值得到保存的数据的具体类型，然后调用相对于的方法获取值
*
* @param context
* @param key
* @param defaultObject
* @return
*/
public
static
Object get(Context context, String key, Object defaultObject)
{
SharedPreferences sp = context.getSharedPreferences(FILE_NAME,
Context.MODE_PRIVATE);
if
(defaultObject
instanceof
String)
{
return
sp.getString(key, (String) defaultObject);
}
else
if
(defaultObject
instanceof
Integer)
{
return
sp.getInt(key, (Integer) defaultObject);
}
else
if
(defaultObject
instanceof
Boolean)
{
return
sp.getBoolean(key, (Boolean) defaultObject);
}
else
if
(defaultObject
instanceof
Float)
{
return
sp.getFloat(key, (Float) defaultObject);
}
else
if
(defaultObject
instanceof
Long)
{
return
sp.getLong(key, (Long) defaultObject);
}
return
null
;
}
/**
* 移除某个key值已经对应的值
* @param context
* @param key
*/
public
static
void
remove(Context context, String key)
{
SharedPreferences sp = context.getSharedPreferences(FILE_NAME,
Context.MODE_PRIVATE);
SharedPreferences.Editor editor = sp.edit();
editor.remove(key);
SharedPreferencesCompat.apply(editor);
}
/**
* 清除所有数据
* @param context
*/
public
static
void
clear(Context context)
{
SharedPreferences sp = context.getSharedPreferences(FILE_NAME,
Context.MODE_PRIVATE);
SharedPreferences.Editor editor = sp.edit();
editor.clear();
SharedPreferencesCompat.apply(editor);
}
/**
* 查询某个key是否已经存在
* @param context
* @param key
* @return
*/
public
static
boolean
contains(Context context, String key)
{
SharedPreferences sp = context.getSharedPreferences(FILE_NAME,
Context.MODE_PRIVATE);
return
sp.contains(key);
}
/**
* 返回所有的键值对
*
* @param context
* @return
*/
public
static
Map<String, ?> getAll(Context context)
{
SharedPreferences sp = context.getSharedPreferences(FILE_NAME,
Context.MODE_PRIVATE);
return
sp.getAll();
}
/**
* 创建一个解决SharedPreferencesCompat.apply方法的一个兼容类
*
* @author zhy
*
*/
private
static
class
SharedPreferencesCompat
{
private
static
final
Method sApplyMethod = findApplyMethod();
/**
* 反射查找apply的方法
*
* @return
*/
@SuppressWarnings
({
"unchecked"
,
"rawtypes"
})
private
static
Method findApplyMethod()
{
try
{
Class clz = SharedPreferences.Editor.
class
;
return
clz.getMethod(
"apply"
);
}
catch
(NoSuchMethodException e)
{
}
return
null
;
}
/**
* 如果找到则使用apply执行，否则使用commit
*
* @param editor
*/
public
static
void
apply(SharedPreferences.Editor editor)
{
try
{
if
(sApplyMethod !=
null
)
{
sApplyMethod.invoke(editor);
return
;
}
}
catch
(IllegalArgumentException e)
{
}
catch
(IllegalAccessException e)
{
}
catch
(InvocationTargetException e)
{
}
editor.commit();
}
}
}
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对SharedPreference的使用做了建议的封装，对外公布出put，get，remove，clear等等方法； 。
注意一点，里面所有的commit操作使用了SharedPreferencesCompat.apply进行了替代，目的是尽可能的使用apply代替commit. 首先说下为什么，因为commit方法是同步的，并且我们很多时候的commit操作都是UI线程中，毕竟是IO操作，尽可能异步； 所以我们使用apply进行替代，apply异步的进行写入； 但是apply相当于commit来说是new API呢，为了更好的兼容，我们做了适配； SharedPreferencesCompat也可以给大家创建兼容类提供了一定的参考 。
2. SPUtils.java 。
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public
class
PreferencesUtils {
public
static
String PREFERENCE_NAME =
"TrineaAndroidCommon"
;
private
PreferencesUtils() {
throw
new
AssertionError();
}
/**
* put string preferences
*
* @param context
* @param key The name of the preference to modify
* @param value The new value for the preference
* @return True if the new values were successfully written to persistent storage.
*/
public
static
boolean
putString(Context context, String key, String value) {
SharedPreferences settings = context.getSharedPreferences(PREFERENCE_NAME, Context.MODE_PRIVATE);
SharedPreferences.Editor editor = settings.edit();
editor.putString(key, value);
return
editor.commit();
}
/**
* get string preferences
*
* @param context
* @param key The name of the preference to retrieve
* @return The preference value if it exists, or null. Throws ClassCastException if there is a preference with this
* name that is not a string
* @see #getString(Context, String, String)
*/
public
static
String getString(Context context, String key) {
return
getString(context, key,
null
);
}
/**
* get string preferences
*
* @param context
* @param key The name of the preference to retrieve
* @param defaultValue Value to return if this preference does not exist
* @return The preference value if it exists, or defValue. Throws ClassCastException if there is a preference with
* this name that is not a string
*/
public
static
String getString(Context context, String key, String defaultValue) {
SharedPreferences settings = context.getSharedPreferences(PREFERENCE_NAME, Context.MODE_PRIVATE);
return
settings.getString(key, defaultValue);
}
/**
* put int preferences
*
* @param context
* @param key The name of the preference to modify
* @param value The new value for the preference
* @return True if the new values were successfully written to persistent storage.
*/
public
static
boolean
putInt(Context context, String key,
int
value) {
SharedPreferences settings = context.getSharedPreferences(PREFERENCE_NAME, Context.MODE_PRIVATE);
SharedPreferences.Editor editor = settings.edit();
editor.putInt(key, value);
return
editor.commit();
}
/**
* get int preferences
*
* @param context
* @param key The name of the preference to retrieve
* @return The preference value if it exists, or -. Throws ClassCastException if there is a preference with this
* name that is not a int
* @see #getInt(Context, String, int)
*/
public
static
int
getInt(Context context, String key) {
return
getInt(context, key, -);
}
/**
* get int preferences
*
* @param context
* @param key The name of the preference to retrieve
* @param defaultValue Value to return if this preference does not exist
* @return The preference value if it exists, or defValue. Throws ClassCastException if there is a preference with
* this name that is not a int
*/
public
static
int
getInt(Context context, String key,
int
defaultValue) {
SharedPreferences settings = context.getSharedPreferences(PREFERENCE_NAME, Context.MODE_PRIVATE);
return
settings.getInt(key, defaultValue);
}
/**
* put long preferences
*
* @param context
* @param key The name of the preference to modify
* @param value The new value for the preference
* @return True if the new values were successfully written to persistent storage.
*/
public
static
boolean
putLong(Context context, String key,
long
value) {
SharedPreferences settings = context.getSharedPreferences(PREFERENCE_NAME, Context.MODE_PRIVATE);
SharedPreferences.Editor editor = settings.edit();
editor.putLong(key, value);
return
editor.commit();
}
/**
* get long preferences
*
* @param context
* @param key The name of the preference to retrieve
* @return The preference value if it exists, or -. Throws ClassCastException if there is a preference with this
* name that is not a long
* @see #getLong(Context, String, long)
*/
public
static
long
getLong(Context context, String key) {
return
getLong(context, key, -);
}
/**
* get long preferences
*
* @param context
* @param key The name of the preference to retrieve
* @param defaultValue Value to return if this preference does not exist
* @return The preference value if it exists, or defValue. Throws ClassCastException if there is a preference with
* this name that is not a long
*/
public
static
long
getLong(Context context, String key,
long
defaultValue) {
SharedPreferences settings = context.getSharedPreferences(PREFERENCE_NAME, Context.MODE_PRIVATE);
return
settings.getLong(key, defaultValue);
}
/**
* put float preferences
*
* @param context
* @param key The name of the preference to modify
* @param value The new value for the preference
* @return True if the new values were successfully written to persistent storage.
*/
public
static
boolean
putFloat(Context context, String key,
float
value) {
SharedPreferences settings = context.getSharedPreferences(PREFERENCE_NAME, Context.MODE_PRIVATE);
SharedPreferences.Editor editor = settings.edit();
editor.putFloat(key, value);
return
editor.commit();
}
/**
* get float preferences
*
* @param context
* @param key The name of the preference to retrieve
* @return The preference value if it exists, or -. Throws ClassCastException if there is a preference with this
* name that is not a float
* @see #getFloat(Context, String, float)
*/
public
static
float
getFloat(Context context, String key) {
return
getFloat(context, key, -);
}
/**
* get float preferences
*
* @param context
* @param key The name of the preference to retrieve
* @param defaultValue Value to return if this preference does not exist
* @return The preference value if it exists, or defValue. Throws ClassCastException if there is a preference with
* this name that is not a float
*/
public
static
float
getFloat(Context context, String key,
float
defaultValue) {
SharedPreferences settings = context.getSharedPreferences(PREFERENCE_NAME, Context.MODE_PRIVATE);
return
settings.getFloat(key, defaultValue);
}
/**
* put boolean preferences
*
* @param context
* @param key The name of the preference to modify
* @param value The new value for the preference
* @return True if the new values were successfully written to persistent storage.
*/
public
static
boolean
putBoolean(Context context, String key,
boolean
value) {
SharedPreferences settings = context.getSharedPreferences(PREFERENCE_NAME, Context.MODE_PRIVATE);
SharedPreferences.Editor editor = settings.edit();
editor.putBoolean(key, value);
return
editor.commit();
}
/**
* get boolean preferences, default is false
*
* @param context
* @param key The name of the preference to retrieve
* @return The preference value if it exists, or false. Throws ClassCastException if there is a preference with this
* name that is not a boolean
* @see #getBoolean(Context, String, boolean)
*/
public
static
boolean
getBoolean(Context context, String key) {
return
getBoolean(context, key,
false
);
}
/**
* get boolean preferences
*
* @param context
* @param key The name of the preference to retrieve
* @param defaultValue Value to return if this preference does not exist
* @return The preference value if it exists, or defValue. Throws ClassCastException if there is a preference with
* this name that is not a boolean
*/
public
static
boolean
getBoolean(Context context, String key,
boolean
defaultValue) {
SharedPreferences settings = context.getSharedPreferences(PREFERENCE_NAME, Context.MODE_PRIVATE);
return
settings.getBoolean(key, defaultValue);
}
}
|
4、单位转换类 DensityUtils.java 。
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public
class
DensityUtils
{
private
DensityUtils()
{
/* cannot be instantiated */
throw new UnsupportedOperationException("cannot be instantiated");
}
/**
* dp转px
*
* @param context
* @param val
* @return
*/
public static int dppx(Context context, float dpVal)
{
return (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP,
dpVal, context.getResources().getDisplayMetrics());
}
/**
* sp转px
*
* @param context
* @param val
* @return
*/
public static int sppx(Context context, float spVal)
{
return (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_SP,
spVal, context.getResources().getDisplayMetrics());
}
/**
* px转dp
*
* @param context
* @param pxVal
* @return
*/
public static float pxdp(Context context, float pxVal)
{
final float scale = context.getResources().getDisplayMetrics().density;
return (pxVal / scale);
}
/**
* px转sp
*
* @param fontScale
* @param pxVal
* @return
*/
public
static
float
pxsp(Context context,
float
pxVal)
{
return
(pxVal / context.getResources().getDisplayMetrics().scaledDensity);
}
}
|
TypedValue:
Container for a dynamically typed data value. Primarily used with Resources for holding resource values. applyDimension(int unit, float value, DisplayMetrics metrics)： Converts an unpacked complex data value holding a dimension to its final floating point value. 。
5、SD卡相关辅助类 SDCardUtils.java 。
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public
class
SDCardUtils
{
private
SDCardUtils()
{
/* cannot be instantiated */
throw new UnsupportedOperationException("cannot be instantiated");
}
/**
* 判断SDCard是否可用
*
* @return
*/
public static boolean isSDCardEnable()
{
return Environment.getExternalStorageState().equals(
Environment.MEDIA_MOUNTED);
}
/**
* 获取SD卡路径
*
* @return
*/
public static String getSDCardPath()
{
return Environment.getExternalStorageDirectory().getAbsolutePath()
+ File.separator;
}
/**
* 获取SD卡的剩余容量 单位byte
*
* @return
*/
public static long getSDCardAllSize()
{
if (isSDCardEnable())
{
StatFs stat = new StatFs(getSDCardPath());
// 获取空闲的数据块的数量
long availableBlocks = (long) stat.getAvailableBlocks() - ;
// 获取单个数据块的大小（byte）
long freeBlocks = stat.getAvailableBlocks();
return freeBlocks * availableBlocks;
}
return ;
}
/**
* 获取指定路径所在空间的剩余可用容量字节数，单位byte
*
* @param filePath
* @return 容量字节 SDCard可用空间，内部存储可用空间
*/
public static long getFreeBytes(String filePath)
{
// 如果是sd卡的下的路径，则获取sd卡可用容量
if (filePath.startsWith(getSDCardPath()))
{
filePath = getSDCardPath();
} else
{// 如果是内部存储的路径，则获取内存存储的可用容量
filePath = Environment.getDataDirectory().getAbsolutePath();
}
StatFs stat = new StatFs(filePath);
long availableBlocks = (long) stat.getAvailableBlocks() - ;
return stat.getBlockSize() * availableBlocks;
}
/**
* 获取系统存储路径
*
* @return
*/
public
static
String getRootDirectoryPath()
{
return
Environment.getRootDirectory().getAbsolutePath();
}
}
|
StatFs 是Android提供的一个类:
Retrieve overall information about the space on a filesystem. This is a wrapper for Unix statvfs(). 。
检索一个文件系统的整体信息空间。这是一个Unix statvfs() 包装器 。
6、屏幕相关辅助类 ScreenUtils.java 。
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public
class
ScreenUtils
{
private
ScreenUtils()
{
/* cannot be instantiated */
throw new UnsupportedOperationException("cannot be instantiated");
}
/**
* 获得屏幕高度
*
* @param context
* @return
*/
public static int getScreenWidth(Context context)
{
WindowManager wm = (WindowManager) context
.getSystemService(Context.WINDOW_SERVICE);
DisplayMetrics outMetrics = new DisplayMetrics();
wm.getDefaultDisplay().getMetrics(outMetrics);
return outMetrics.widthPixels;
}
/**
* 获得屏幕宽度
*
* @param context
* @return
*/
public static int getScreenHeight(Context context)
{
WindowManager wm = (WindowManager) context
.getSystemService(Context.WINDOW_SERVICE);
DisplayMetrics outMetrics = new DisplayMetrics();
wm.getDefaultDisplay().getMetrics(outMetrics);
return outMetrics.heightPixels;
}
/**
* 获得状态栏的高度
*
* @param context
* @return
*/
public static int getStatusHeight(Context context)
{
int statusHeight = -;
try
{
Class<?> clazz = Class.forName("com.android.internal.R$dimen");
Object object = clazz.newInstance();
int height = Integer.parseInt(clazz.getField("status_bar_height")
.get(object).toString());
statusHeight = context.getResources().getDimensionPixelSize(height);
} catch (Exception e)
{
e.printStackTrace();
}
return statusHeight;
}
/**
* 获取当前屏幕截图，包含状态栏
*
* @param activity
* @return
*/
public static Bitmap snapShotWithStatusBar(Activity activity)
{
View view = activity.getWindow().getDecorView();
view.setDrawingCacheEnabled(true);
view.buildDrawingCache();
Bitmap bmp = view.getDrawingCache();
int width = getScreenWidth(activity);
int height = getScreenHeight(activity);
Bitmap bp = null;
bp = Bitmap.createBitmap(bmp, , , width, height);
view.destroyDrawingCache();
return bp;
}
/**
* 获取当前屏幕截图，不包含状态栏
*
* @param activity
* @return
*/
public
static
Bitmap snapShotWithoutStatusBar(Activity activity)
{
View view = activity.getWindow().getDecorView();
view.setDrawingCacheEnabled(
true
);
view.buildDrawingCache();
Bitmap bmp = view.getDrawingCache();
Rect frame =
new
Rect();
activity.getWindow().getDecorView().getWindowVisibleDisplayFrame(frame);
int
statusBarHeight = frame.top;
int
width = getScreenWidth(activity);
int
height = getScreenHeight(activity);
Bitmap bp =
null
;
bp = Bitmap.createBitmap(bmp, , statusBarHeight, width, height
- statusBarHeight);
view.destroyDrawingCache();
return
bp;
}
}
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7、App相关辅助类 APPUtils.java 。
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public
class
AppUtils
{
private
AppUtils()
{
/* cannot be instantiated */
throw new UnsupportedOperationException("cannot be instantiated");
}
/**
* 获取应用程序名称
*/
public static String getAppName(Context context)
{
try
{
PackageManager packageManager = context.getPackageManager();
PackageInfo packageInfo = packageManager.getPackageInfo(
context.getPackageName(), );
int labelRes = packageInfo.applicationInfo.labelRes;
return context.getResources().getString(labelRes);
} catch (NameNotFoundException e)
{
e.printStackTrace();
}
return null;
}
/**
* [获取应用程序版本名称信息]
*
* @param context
* @return 当前应用的版本名称
*/
public
static
String getVersionName(Context context)
{
try
{
PackageManager packageManager = context.getPackageManager();
PackageInfo packageInfo = packageManager.getPackageInfo(
context.getPackageName(), );
return
packageInfo.versionName;
}
catch
(NameNotFoundException e)
{
e.printStackTrace();
}
return
null
;
}
}
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8、软键盘相关辅助类KeyBoardUtils.java 。
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/**
* 打开或关闭软键盘
*/
public
class
KeyBoardUtils
{
/**
* 打卡软键盘
*
* @param mEditText 输入框
* @param mContext 上下文
*/
public
static
void
openKeybord(EditText mEditText, Context mContext)
{
InputMethodManager imm = (InputMethodManager) mContext
.getSystemService(Context.INPUT_METHOD_SERVICE);
imm.showSoftInput(mEditText, InputMethodManager.RESULT_SHOWN);
imm.toggleSoftInput(InputMethodManager.SHOW_FORCED,
InputMethodManager.HIDE_IMPLICIT_ONLY);
}
/**
* 关闭软键盘
*
* @param mEditText 输入框
* @param mContext 上下文
*/
public
static
void
closeKeybord(EditText mEditText, Context mContext)
{
InputMethodManager imm = (InputMethodManager) mContext
.getSystemService(Context.INPUT_METHOD_SERVICE);
imm.hideSoftInputFromWindow(mEditText.getWindowToken(), );
}
}
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9、网络相关辅助类 NetUtils.java 。
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public
class
NetUtils
{
private
NetUtils()
{
/* cannot be instantiated */
throw new UnsupportedOperationException("cannot be instantiated");
}
/**
* 判断网络是否连接
*/
public static boolean isConnected(Context context)
{
ConnectivityManager connectivity = (ConnectivityManager) context
.getSystemService(Context.CONNECTIVITY_SERVICE);
if (null != connectivity)
{
NetworkInfo info = connectivity.getActiveNetworkInfo();
if (null != info && info.isConnected())
{
if (info.getState() == NetworkInfo.State.CONNECTED)
{
return true;
}
}
}
return false;
}
/**
* 判断是否是wifi连接
*/
public static boolean isWifi(Context context)
{
ConnectivityManager cm = (ConnectivityManager) context
.getSystemService(Context.CONNECTIVITY_SERVICE);
if (cm == null)
return false;
return cm.getActiveNetworkInfo().getType() == ConnectivityManager.TYPE_WIFI;
}
/**
* 打开网络设置界面
*/
public
static
void
openSetting(Activity activity)
{
Intent intent =
new
Intent(
"/"
);
ComponentName cm =
new
ComponentName(
"com.android.settings"
,
"com.android.settings.WirelessSettings"
);
intent.setComponent(cm);
intent.setAction(
"android.intent.action.VIEW"
);
activity.startActivityForResult(intent, );
}
}
|
10、Http相关辅助类 HttpUtils.java 。
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/**
* Http请求的工具类
*/
public
class
HttpUtils
{
private
static
final
int
TIMEOUT_IN_MILLIONS = ;
public
interface
CallBack
{
void
onRequestComplete(String result);
}
/**
* 异步的Get请求
*
* @param urlStr
* @param callBack
*/
public
static
void
doGetAsyn(
final
String urlStr,
final
CallBack callBack)
{
new
Thread()
{
public
void
run()
{
try
{
String result = doGet(urlStr);
if
(callBack !=
null
)
{
callBack.onRequestComplete(result);
}
}
catch
(Exception e)
{
e.printStackTrace();
}
};
}.start();
}
/**
* 异步的Post请求
* @param urlStr
* @param params
* @param callBack
* @throws Exception
*/
public
static
void
doPostAsyn(
final
String urlStr,
final
String params,
final
CallBack callBack)
throws
Exception
{
new
Thread()
{
public
void
run()
{
try
{
String result = doPost(urlStr, params);
if
(callBack !=
null
)
{
callBack.onRequestComplete(result);
}
}
catch
(Exception e)
{
e.printStackTrace();
}
};
}.start();
}
/**
* Get请求，获得返回数据
*
* @param urlStr
* @return
* @throws Exception
*/
public
static
String doGet(String urlStr)
{
URL url =
null
;
HttpURLConnection conn =
null
;
InputStream is =
null
;
ByteArrayOutputStream baos =
null
;
try
{
url =
new
URL(urlStr);
conn = (HttpURLConnection) url.openConnection();
conn.setReadTimeout(TIMEOUT_IN_MILLIONS);
conn.setConnectTimeout(TIMEOUT_IN_MILLIONS);
conn.setRequestMethod(
"GET"
);
conn.setRequestProperty(
"accept"
,
"*/*"
);
conn.setRequestProperty(
"connection"
,
"Keep-Alive"
);
if
(conn.getResponseCode() == )
{
is = conn.getInputStream();
baos =
new
ByteArrayOutputStream();
int
len = -;
byte
[] buf =
new
byte
[];
while
((len = is.read(buf)) != -)
{
baos.write(buf, , len);
}
baos.flush();
return
baos.toString();
}
else
{
throw
new
RuntimeException(
" responseCode is not ... "
);
}
}
catch
(Exception e)
{
e.printStackTrace();
}
finally
{
try
{
if
(is !=
null
)
is.close();
}
catch
(IOException e)
{
}
try
{
if
(baos !=
null
)
baos.close();
}
catch
(IOException e)
{
}
conn.disconnect();
}
return
null
;
}
/**
* 向指定 URL 发送POST方法的请求
*
* @param url
* 发送请求的 URL
* @param param
* 请求参数，请求参数应该是 name=value&name=value 的形式。
* @return 所代表远程资源的响应结果
* @throws Exception
*/
public
static
String doPost(String url, String param)
{
PrintWriter out =
null
;
BufferedReader in =
null
;
String result =
""
;
try
{
URL realUrl =
new
URL(url);
// 打开和URL之间的连接
HttpURLConnection conn = (HttpURLConnection) realUrl
.openConnection();
// 设置通用的请求属性
conn.setRequestProperty(
"accept"
,
"*/*"
);
conn.setRequestProperty(
"connection"
,
"Keep-Alive"
);
conn.setRequestMethod(
"POST"
);
conn.setRequestProperty(
"Content-Type"
,
"application/x-www-form-urlencoded"
);
conn.setRequestProperty(
"charset"
,
"utf-"
);
conn.setUseCaches(
false
);
// 发送POST请求必须设置如下两行
conn.setDoOutput(
true
);
conn.setDoInput(
true
);
conn.setReadTimeout(TIMEOUT_IN_MILLIONS);
conn.setConnectTimeout(TIMEOUT_IN_MILLIONS);
if
(param !=
null
&& !param.trim().equals(
""
))
{
// 获取URLConnection对象对应的输出流
out =
new
PrintWriter(conn.getOutputStream());
// 发送请求参数
out.print(param);
// flush输出流的缓冲
out.flush();
}
// 定义BufferedReader输入流来读取URL的响应
in =
new
BufferedReader(
new
InputStreamReader(conn.getInputStream()));
String line;
while
((line = in.readLine()) !=
null
)
{
result += line;
}
}
catch
(Exception e)
{
e.printStackTrace();
}
// 使用finally块来关闭输出流、输入流
finally
{
try
{
if
(out !=
null
)
{
out.close();
}
if
(in !=
null
)
{
in.close();
}
}
catch
(IOException ex)
{
ex.printStackTrace();
}
}
return
result;
}
}
|
11、时间工具类 TimeUtils.java 。
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public
class
TimeUtils {
public
static
final
SimpleDateFormat DEFAULT_DATE_FORMAT =
new
SimpleDateFormat(
"yyyy-MM-dd HH:mm:ss"
);
public
static
final
SimpleDateFormat DATE_FORMAT_DATE =
new
SimpleDateFormat(
"yyyy-MM-dd"
);
private
TimeUtils() {
throw
new
AssertionError();
}
/**
* long time to string
*
* @param timeInMillis
* @param dateFormat
* @return
*/
public
static
String getTime(
long
timeInMillis, SimpleDateFormat dateFormat) {
return
dateFormat.format(
new
Date(timeInMillis));
}
/**
* long time to string, format is {@link #DEFAULT_DATE_FORMAT}
*
* @param timeInMillis
* @return
*/
public
static
String getTime(
long
timeInMillis) {
return
getTime(timeInMillis, DEFAULT_DATE_FORMAT);
}
/**
* get current time in milliseconds
*
* @return
*/
public
static
long
getCurrentTimeInLong() {
return
System.currentTimeMillis();
}
/**
* get current time in milliseconds, format is {@link #DEFAULT_DATE_FORMAT}
*
* @return
*/
public
static
String getCurrentTimeInString() {
return
getTime(getCurrentTimeInLong());
}
/**
* get current time in milliseconds
*
* @return
*/
public
static
String getCurrentTimeInString(SimpleDateFormat dateFormat) {
return
getTime(getCurrentTimeInLong(), dateFormat);
}
}
|
12、文件工具类 FileUtils.java 。
。
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public
class
FileUtils {
public
final
static
String FILE_EXTENSION_SEPARATOR =
"."
;
private
FileUtils() {
throw
new
AssertionError();
}
/**
* read file
*
* @param filePath
* @param charsetName The name of a supported {@link java.nio.charset.Charset </code>charset<code>}
* @return if file not exist, return null, else return content of file
* @throws RuntimeException if an error occurs while operator BufferedReader
*/
public
static
StringBuilder readFile(String filePath, String charsetName) {
File file =
new
File(filePath);
StringBuilder fileContent =
new
StringBuilder(
""
);
if
(file ==
null
|| !file.isFile()) {
return
null
;
}
BufferedReader reader =
null
;
try
{
InputStreamReader is =
new
InputStreamReader(
new
FileInputStream(file), charsetName);
reader =
new
BufferedReader(is);
String line =
null
;
while
((line = reader.readLine()) !=
null
) {
if
(!fileContent.toString().equals(
""
)) {
fileContent.append(
"\r\n"
);
}
fileContent.append(line);
}
return
fileContent;
}
catch
(IOException e) {
throw
new
RuntimeException(
"IOException occurred. "
, e);
}
finally
{
IOUtils.close(reader);
}
}
/**
* write file
*
* @param filePath
* @param content
* @param append is append, if true, write to the end of file, else clear content of file and write into it
* @return return false if content is empty, true otherwise
* @throws RuntimeException if an error occurs while operator FileWriter
*/
public
static
boolean
writeFile(String filePath, String content,
boolean
append) {
if
(StringUtils.isEmpty(content)) {
return
false
;
}
FileWriter fileWriter =
null
;
try
{
makeDirs(filePath);
fileWriter =
new
FileWriter(filePath, append);
fileWriter.write(content);
return
true
;
}
catch
(IOException e) {
throw
new
RuntimeException(
"IOException occurred. "
, e);
}
finally
{
IOUtils.close(fileWriter);
}
}
/**
* write file
*
* @param filePath
* @param contentList
* @param append is append, if true, write to the end of file, else clear content of file and write into it
* @return return false if contentList is empty, true otherwise
* @throws RuntimeException if an error occurs while operator FileWriter
*/
public
static
boolean
writeFile(String filePath, List<String> contentList,
boolean
append) {
if
(ListUtils.isEmpty(contentList)) {
return
false
;
}
FileWriter fileWriter =
null
;
try
{
makeDirs(filePath);
fileWriter =
new
FileWriter(filePath, append);
int
i = ;
for
(String line : contentList) {
if
(i++ > ) {
fileWriter.write(
"\r\n"
);
}
fileWriter.write(line);
}
return
true
;
}
catch
(IOException e) {
throw
new
RuntimeException(
"IOException occurred. "
, e);
}
finally
{
IOUtils.close(fileWriter);
}
}
/**
* write file, the string will be written to the begin of the file
*
* @param filePath
* @param content
* @return
*/
public
static
boolean
writeFile(String filePath, String content) {
return
writeFile(filePath, content,
false
);
}
/**
* write file, the string list will be written to the begin of the file
*
* @param filePath
* @param contentList
* @return
*/
public
static
boolean
writeFile(String filePath, List<String> contentList) {
return
writeFile(filePath, contentList,
false
);
}
/**
* write file, the bytes will be written to the begin of the file
*
* @param filePath
* @param stream
* @return
* @see {@link #writeFile(String, InputStream, boolean)}
*/
public
static
boolean
writeFile(String filePath, InputStream stream) {
return
writeFile(filePath, stream,
false
);
}
/**
* write file
*
* @param file the file to be opened for writing.
* @param stream the input stream
* @param append if <code>true</code>, then bytes will be written to the end of the file rather than the beginning
* @return return true
* @throws RuntimeException if an error occurs while operator FileOutputStream
*/
public
static
boolean
writeFile(String filePath, InputStream stream,
boolean
append) {
return
writeFile(filePath !=
null
?
new
File(filePath) :
null
, stream, append);
}
/**
* write file, the bytes will be written to the begin of the file
*
* @param file
* @param stream
* @return
* @see {@link #writeFile(File, InputStream, boolean)}
*/
public
static
boolean
writeFile(File file, InputStream stream) {
return
writeFile(file, stream,
false
);
}
/**
* write file
*
* @param file the file to be opened for writing.
* @param stream the input stream
* @param append if <code>true</code>, then bytes will be written to the end of the file rather than the beginning
* @return return true
* @throws RuntimeException if an error occurs while operator FileOutputStream
*/
public
static
boolean
writeFile(File file, InputStream stream,
boolean
append) {
OutputStream o =
null
;
try
{
makeDirs(file.getAbsolutePath());
o =
new
FileOutputStream(file, append);
byte
data[] =
new
byte
[];
int
length = -;
while
((length = stream.read(data)) != -) {
o.write(data, , length);
}
o.flush();
return
true
;
}
catch
(FileNotFoundException e) {
throw
new
RuntimeException(
"FileNotFoundException occurred. "
, e);
}
catch
(IOException e) {
throw
new
RuntimeException(
"IOException occurred. "
, e);
}
finally
{
IOUtils.close(o);
IOUtils.close(stream);
}
}
/**
* move file
*
* @param sourceFilePath
* @param destFilePath
*/
public
static
void
moveFile(String sourceFilePath, String destFilePath) {
if
(TextUtils.isEmpty(sourceFilePath) || TextUtils.isEmpty(destFilePath)) {
throw
new
RuntimeException(
"Both sourceFilePath and destFilePath cannot be null."
);
}
moveFile(
new
File(sourceFilePath),
new
File(destFilePath));
}
/**
* move file
*
* @param srcFile
* @param destFile
*/
public
static
void
moveFile(File srcFile, File destFile) {
boolean
rename = srcFile.renameTo(destFile);
if
(!rename) {
copyFile(srcFile.getAbsolutePath(), destFile.getAbsolutePath());
deleteFile(srcFile.getAbsolutePath());
}
}
/**
* copy file
*
* @param sourceFilePath
* @param destFilePath
* @return
* @throws RuntimeException if an error occurs while operator FileOutputStream
*/
public
static
boolean
copyFile(String sourceFilePath, String destFilePath) {
InputStream inputStream =
null
;
try
{
inputStream =
new
FileInputStream(sourceFilePath);
}
catch
(FileNotFoundException e) {
throw
new
RuntimeException(
"FileNotFoundException occurred. "
, e);
}
return
writeFile(destFilePath, inputStream);
}
/**
* read file to string list, a element of list is a line
*
* @param filePath
* @param charsetName The name of a supported {@link java.nio.charset.Charset </code>charset<code>}
* @return if file not exist, return null, else return content of file
* @throws RuntimeException if an error occurs while operator BufferedReader
*/
public
static
List<String> readFileToList(String filePath, String charsetName) {
File file =
new
File(filePath);
List<String> fileContent =
new
ArrayList<String>();
if
(file ==
null
|| !file.isFile()) {
return
null
;
}
BufferedReader reader =
null
;
try
{
InputStreamReader is =
new
InputStreamReader(
new
FileInputStream(file), charsetName);
reader =
new
BufferedReader(is);
String line =
null
;
while
((line = reader.readLine()) !=
null
) {
fileContent.add(line);
}
return
fileContent;
}
catch
(IOException e) {
throw
new
RuntimeException(
"IOException occurred. "
, e);
}
finally
{
IOUtils.close(reader);
}
}
/**
* get file name from path, not include suffix
*
* <pre>
* getFileNameWithoutExtension(null) = null
* getFileNameWithoutExtension("") = ""
* getFileNameWithoutExtension(" ") = " "
* getFileNameWithoutExtension("abc") = "abc"
* getFileNameWithoutExtension("a.mp") = "a"
* getFileNameWithoutExtension("a.b.rmvb") = "a.b"
* getFileNameWithoutExtension("c:\\") = ""
* getFileNameWithoutExtension("c:\\a") = "a"
* getFileNameWithoutExtension("c:\\a.b") = "a"
* getFileNameWithoutExtension("c:a.txt\\a") = "a"
* getFileNameWithoutExtension("/home/admin") = "admin"
* getFileNameWithoutExtension("/home/admin/a.txt/b.mp") = "b"
* </pre>
*
* @param filePath
* @return file name from path, not include suffix
* @see
*/
public
static
String getFileNameWithoutExtension(String filePath) {
if
(StringUtils.isEmpty(filePath)) {
return
filePath;
}
int
extenPosi = filePath.lastIndexOf(FILE_EXTENSION_SEPARATOR);
int
filePosi = filePath.lastIndexOf(File.separator);
if
(filePosi == -) {
return
(extenPosi == - ? filePath : filePath.substring(, extenPosi));
}
if
(extenPosi == -) {
return
filePath.substring(filePosi + );
}
return
(filePosi < extenPosi ? filePath.substring(filePosi + , extenPosi) : filePath.substring(filePosi + ));
}
/**
* get file name from path, include suffix
*
* <pre>
* getFileName(null) = null
* getFileName("") = ""
* getFileName(" ") = " "
* getFileName("a.mp") = "a.mp"
* getFileName("a.b.rmvb") = "a.b.rmvb"
* getFileName("abc") = "abc"
* getFileName("c:\\") = ""
* getFileName("c:\\a") = "a"
* getFileName("c:\\a.b") = "a.b"
* getFileName("c:a.txt\\a") = "a"
* getFileName("/home/admin") = "admin"
* getFileName("/home/admin/a.txt/b.mp") = "b.mp"
* </pre>
*
* @param filePath
* @return file name from path, include suffix
*/
public
static
String getFileName(String filePath) {
if
(StringUtils.isEmpty(filePath)) {
return
filePath;
}
int
filePosi = filePath.lastIndexOf(File.separator);
return
(filePosi == -) ? filePath : filePath.substring(filePosi + );
}
/**
* get folder name from path
*
* <pre>
* getFolderName(null) = null
* getFolderName("") = ""
* getFolderName(" ") = ""
* getFolderName("a.mp") = ""
* getFolderName("a.b.rmvb") = ""
* getFolderName("abc") = ""
* getFolderName("c:\\") = "c:"
* getFolderName("c:\\a") = "c:"
* getFolderName("c:\\a.b") = "c:"
* getFolderName("c:a.txt\\a") = "c:a.txt"
* getFolderName("c:a\\b\\c\\d.txt") = "c:a\\b\\c"
* getFolderName("/home/admin") = "/home"
* getFolderName("/home/admin/a.txt/b.mp") = "/home/admin/a.txt"
* </pre>
*
* @param filePath
* @return
*/
public
static
String getFolderName(String filePath) {
if
(StringUtils.isEmpty(filePath)) {
return
filePath;
}
int
filePosi = filePath.lastIndexOf(File.separator);
return
(filePosi == -) ?
""
: filePath.substring(, filePosi);
}
/**
* get suffix of file from path
*
* <pre>
* getFileExtension(null) = ""
* getFileExtension("") = ""
* getFileExtension(" ") = " "
* getFileExtension("a.mp") = "mp"
* getFileExtension("a.b.rmvb") = "rmvb"
* getFileExtension("abc") = ""
* getFileExtension("c:\\") = ""
* getFileExtension("c:\\a") = ""
* getFileExtension("c:\\a.b") = "b"
* getFileExtension("c:a.txt\\a") = ""
* getFileExtension("/home/admin") = ""
* getFileExtension("/home/admin/a.txt/b") = ""
* getFileExtension("/home/admin/a.txt/b.mp") = "mp"
* </pre>
*
* @param filePath
* @return
*/
public
static
String getFileExtension(String filePath) {
if
(StringUtils.isBlank(filePath)) {
return
filePath;
}
int
extenPosi = filePath.lastIndexOf(FILE_EXTENSION_SEPARATOR);
int
filePosi = filePath.lastIndexOf(File.separator);
if
(extenPosi == -) {
return
""
;
}
return
(filePosi >= extenPosi) ?
""
: filePath.substring(extenPosi + );
}
/**
* Creates the directory named by the trailing filename of this file, including the complete directory path required
* to create this directory. <br/>
* <br/>
* <ul>
* <strong>Attentions:</strong>
* <li>makeDirs("C:\\Users\\Trinea") can only create users folder</li>
* <li>makeFolder("C:\\Users\\Trinea\\") can create Trinea folder</li>
* </ul>
*
* @param filePath
* @return true if the necessary directories have been created or the target directory already exists, false one of
* the directories can not be created.
* <ul>
* <li>if {@link FileUtils#getFolderName(String)} return null, return false</li>
* <li>if target directory already exists, return true</li>
* <li>return {@link java.io.File#makeFolder}</li>
* </ul>
*/
public
static
boolean
makeDirs(String filePath) {
String folderName = getFolderName(filePath);
if
(StringUtils.isEmpty(folderName)) {
return
false
;
}
File folder =
new
File(folderName);
return
(folder.exists() && folder.isDirectory()) ?
true
: folder.mkdirs();
}
/**
* @param filePath
* @return
* @see #makeDirs(String)
*/
public
static
boolean
makeFolders(String filePath) {
return
makeDirs(filePath);
}
/**
* Indicates if this file represents a file on the underlying file system.
*
* @param filePath
* @return
*/
public
static
boolean
isFileExist(String filePath) {
if
(StringUtils.isBlank(filePath)) {
return
false
;
}
File file =
new
File(filePath);
return
(file.exists() && file.isFile());
}
/**
* Indicates if this file represents a directory on the underlying file system.
*
* @param directoryPath
* @return
*/
public
static
boolean
isFolderExist(String directoryPath) {
if
(StringUtils.isBlank(directoryPath)) {
return
false
;
}
File dire =
new
File(directoryPath);
return
(dire.exists() && dire.isDirectory());
}
/**
* delete file or directory
* <ul>
* <li>if path is null or empty, return true</li>
* <li>if path not exist, return true</li>
* <li>if path exist, delete recursion. return true</li>
* <ul>
*
* @param path
* @return
*/
public
static
boolean
deleteFile(String path) {
if
(StringUtils.isBlank(path)) {
return
true
;
}
File file =
new
File(path);
if
(!file.exists()) {
return
true
;
}
if
(file.isFile()) {
return
file.delete();
}
if
(!file.isDirectory()) {
return
false
;
}
for
(File f : file.listFiles()) {
if
(f.isFile()) {
f.delete();
}
else
if
(f.isDirectory()) {
deleteFile(f.getAbsolutePath());
}
}
return
file.delete();
}
/**
* get file size
* <ul>
* <li>if path is null or empty, return -</li>
* <li>if path exist and it is a file, return file size, else return -</li>
* <ul>
*
* @param path
* @return returns the length of this file in bytes. returns - if the file does not exist.
*/
public
static
long
getFileSize(String path) {
if
(StringUtils.isBlank(path)) {
return
-;
}
File file =
new
File(path);
return
(file.exists() && file.isFile() ? file.length() : -);
}
}
|
十3、assets和raw资源工具类 ResourceUtils.java 。
|
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|
public
class
ResourceUtils {
private
ResourceUtils() {
throw
new
AssertionError();
}
/**
* get an asset using ACCESS_STREAMING mode. This provides access to files that have been bundled with an
* application as assets -- that is, files placed in to the "assets" directory.
*
* @param context
* @param fileName The name of the asset to open. This name can be hierarchical.
* @return
*/
public
static
String geFileFromAssets(Context context, String fileName) {
if
(context ==
null
|| StringUtils.isEmpty(fileName)) {
return
null
;
}
StringBuilder s =
new
StringBuilder(
""
);
try
{
InputStreamReader in =
new
InputStreamReader(context.getResources().getAssets().open(fileName));
BufferedReader br =
new
BufferedReader(in);
String line;
while
((line = br.readLine()) !=
null
) {
s.append(line);
}
return
s.toString();
}
catch
(IOException e) {
e.printStackTrace();
return
null
;
}
}
/**
* get content from a raw resource. This can only be used with resources whose value is the name of an asset files
* -- that is, it can be used to open drawable, sound, and raw resources; it will fail on string and color
* resources.
*
* @param context
* @param resId The resource identifier to open, as generated by the appt tool.
* @return
*/
public
static
String geFileFromRaw(Context context,
int
resId) {
if
(context ==
null
) {
return
null
;
}
StringBuilder s =
new
StringBuilder();
try
{
InputStreamReader in =
new
InputStreamReader(context.getResources().openRawResource(resId));
BufferedReader br =
new
BufferedReader(in);
String line;
while
((line = br.readLine()) !=
null
) {
s.append(line);
}
return
s.toString();
}
catch
(IOException e) {
e.printStackTrace();
return
null
;
}
}
/**
* same to {@link ResourceUtils#geFileFromAssets(Context, String)}, but return type is List<String>
*
* @param context
* @param fileName
* @return
*/
public
static
List<String> geFileToListFromAssets(Context context, String fileName) {
if
(context ==
null
|| StringUtils.isEmpty(fileName)) {
return
null
;
}
List<String> fileContent =
new
ArrayList<String>();
try
{
InputStreamReader in =
new
InputStreamReader(context.getResources().getAssets().open(fileName));
BufferedReader br =
new
BufferedReader(in);
String line;
while
((line = br.readLine()) !=
null
) {
fileContent.add(line);
}
br.close();
return
fileContent;
}
catch
(IOException e) {
e.printStackTrace();
return
null
;
}
}
/**
* same to {@link ResourceUtils#geFileFromRaw(Context, int)}, but return type is List<String>
*
* @param context
* @param resId
* @return
*/
public
static
List<String> geFileToListFromRaw(Context context,
int
resId) {
if
(context ==
null
) {
return
null
;
}
List<String> fileContent =
new
ArrayList<String>();
BufferedReader reader =
null
;
try
{
InputStreamReader in =
new
InputStreamReader(context.getResources().openRawResource(resId));
reader =
new
BufferedReader(in);
String line =
null
;
while
((line = reader.readLine()) !=
null
) {
fileContent.add(line);
}
reader.close();
return
fileContent;
}
catch
(IOException e) {
e.printStackTrace();
return
null
;
}
}
}
|
14、单例工具类 SingletonUtils.java 。
|
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2
3
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5
6
7
8
9
10
11
12
13
14
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public
abstract
class
SingletonUtils<T> {
private
T instance;
protected
abstract
T newInstance();
public
final
T getInstance() {
if
(instance ==
null
) {
synchronized
(SingletonUtils.
class
) {
if
(instance ==
null
) {
instance = newInstance();
}
}
}
return
instance;
}
}
|
十5、数据库工具类 SqliteUtils.java 。
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public
class
SqliteUtils {
private
static
volatile
SqliteUtils instance;
private
DbHelper dbHelper;
private
SQLiteDatabase db;
private
SqliteUtils(Context context) {
dbHelper =
new
DbHelper(context);
db = dbHelper.getWritableDatabase();
}
public
static
SqliteUtils getInstance(Context context) {
if
(instance ==
null
) {
synchronized
(SqliteUtils.
class
) {
if
(instance ==
null
) {
instance =
new
SqliteUtils(context);
}
}
}
return
instance;
}
public
SQLiteDatabase getDb() {
return
db;
}
}
|
最后此篇关于实例详解Android快速开发工具类总结的文章就讲到这里了,如果你想了解更多关于实例详解Android快速开发工具类总结的内容请搜索CFSDN的文章或继续浏览相关文章，希望大家以后支持我的博客！ 。
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我在一家医疗保健公司工作，拥有有关患者位置(地址、城市、州、 zip )的信息。我试图确定有多少百分比的患者住在离 5 个特定位置最近的地方。我正在寻找的答案是“25% 的患者住在离#1 地点最近的地
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