我是 Android 的新手，到目前为止我一直完全遵循 Android 官方教程:https://developer.android.com/training/basics/actionbar/styling.html我正在尝试使用支持库(使用 Theme.AppCompact)更改背景颜色并查看操作栏上的默认 Android 图标。但是当我尝试设置像 #AA0000 这样的十六进制颜色时，Android Studio 给我错误“无法解析符号”(在 themes.xml 的支持库行上)，而且如果没有错误，我也看不到 Android操作栏左侧的图标。

期望是这样的:

真正的结果(当我删除十六进制并设置背景图像以避免错误时)是这样的:

左边的图标不见了(右边的菜单底部也不见了，但我不知道问题是否与屏幕的英寸尺寸有关)。

但是，在这种情况下，我只能设置背景图像，不能设置十六进制颜色，而且我无法查看图标，这些是我的文件(themes.xml 中的十六进制颜色):

Đây làAndroidManifest.xml

package="com.mycompany.myfirstapp" >

<ứng>
    android:allowBackup="true"
    android:icon="@mipmap/ic_launcher"
    android:label="@string/tên_ứng_dụng"
    android:theme="@style/AppTheme" >
    
        android:name=".MyActivity"
        android:label="@string/tên_ứng_dụng"
        android:theme="@style/CustomActionBarTheme" >
        
            

            
        
    
    
        android:name=".DisplayMessageActivity"
        android:label="@string/title_activity_display_message"
        android:parentActivityName=".MyActivity" >
        <>
            android:name="android.support.PARENT_ACTIVITY"
            android:value="com.mycompany.myfirstapp.MyActivity" />
    

Themes.xml

MyActivity.java

public class MyActivity extends AppCompatActivity {
    public final static String EXTRA_MESSAGE = "com.mycompany.myfirstapp.MESSAGE";

    @Ghi đè
    được bảo vệ void onCreate(Gói savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_my);
    }

    @Ghi đè
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu items for use in the action bar
        MenuInflater inflater = getMenuInflater();
        inflater.inflate(R.menu.main_activity_actions, menu);
        return super.onCreateOptionsMenu(menu);
    }

    @Ghi đè
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();

        // Handle presses on the action bar items
        switch (id) {
            case R.id.action_search:
                //openSearch();
                Log.i("MyActivity", "SEARCH PRESSED");
                trả về giá trị đúng;
            case R.id.action_settings:
                //openSettings();
                Log.i("MyActivity", "SETTINGS PRESSED");
                trả về giá trị đúng;
            mặc định:
                return super.onOptionsItemSelected(item);
        }
    }

    /** Called when the user clicks the Send button */
    public void sendMessage(View view) {
        Intent intent = new Intent(this, DisplayMessageActivity.class);
        EditText editText = (EditText) findViewById(R.id.edit_message);
        String message = editText.getText().toString();
        intent.putExtra(EXTRA_MESSAGE, message);
        startActivity(intent);
    }
}

activity_my.xml

xmlns:tools="http://schemas.android.com/tools"
android:layout_width="phù hợp với cha mẹ"
android:layout_height="match_parent"
android:orientation="horizontal" >


    android:layout_weight="1"
    android:layout_width="0dp"
    android:layout_height="wrap_content"
    android:hint="@string/edit_message" />
<>
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="@string/button_send"
    android:onClick="sendMessage"/>

**main_activity_actions.xml

xmlns:app="http://schemas.android.com/apk/res-auto">


    android:icon="@drawable/ic_action_search"
    android:title="@string/action_search"
    app:showAsAction="ifRoom" />


    android:title="@string/action_settings"
    app:showAsAction="never" />

styles.xml