目前市面上很多APP會在重要日期或節假日對應用圖示進行修改，這將用到activity-alias屬性，該屬性可以用於建立多個不同的入口，具體使用如下：

<activity-alias
            android:name=".MainActivity2"
            android:enabled="false"
            android:icon="@drawable/icon2"
            android:label="newIcon"
            android:targetActivity=".MainActivity" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity-alias>
 

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.changeicondemo"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="21" />

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name=".MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

        <!-- name：元件名字 -->
        <!-- enabled：該元件是否啟動 -->
        <!-- icon：元件圖示 -->
        <!-- label：元件標籤說明 -->
        <!-- targetActivity：元件的類 -->
        <activity-alias
            android:name=".MainActivity2"
            android:enabled="false"
            android:icon="@drawable/icon2"
            android:label="newIcon"
            android:targetActivity=".MainActivity" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity-alias>
    </application>

</manifest>
 

public class MainActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        ((Button) findViewById(R.id.btn)).setOnClickListener(new OnClickListener() {
			
			@Override
			public void onClick(View v) {
				// TODO Auto-generated method stub
				changeIcon();
				Intent intent = new Intent(Intent.ACTION_MAIN);//模擬Home鍵點選
				intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
				intent.addCategory(Intent.CATEGORY_HOME);
				startActivity(intent);
			}
		});
    }
    
    private void changeIcon() {  
        PackageManager pm = getApplicationContext().getPackageManager();  
        //去除舊圖示，否則會出現2個圖示  
        pm.setComponentEnabledSetting(getComponentName(),  
                PackageManager.COMPONENT_ENABLED_STATE_DISABLED,  
                PackageManager.DONT_KILL_APP);  
        //顯示新圖示  
        pm.setComponentEnabledSetting(new ComponentName(  
                        getBaseContext(),  
                        "com.example.changeicondemo.MainActivity2"),  
                        PackageManager.COMPONENT_ENABLED_STATE_ENABLED,  
                        PackageManager.DONT_KILL_APP);  
    }  

}
 

activity_main.xml程式碼：

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:gravity="center" >

    <Button
        android:id="@+id/btn"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/hello_world"
         />

</RelativeLayout>

實現思路是通過activity-alias屬性修改應用入口，從而實現應用圖示修改，更新應用圖示可能需要一小段時間，例子比較簡單，完整Demo下載連結:

百度雲盤連結: https://pan.baidu.com/s/1slzABDV 密碼: qxrn