PackageManager pm = getApplicationContext().getPackageManager();
        System.out.println(getComponentName());
        //去除舊圖示，不去除的話會出現2個App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.wen.icontest.ActivityAlias2"),
                PackageManager.COMPONENT_ENABLED_STATE_ENABLED,
                PackageManager.DONT_KILL_APP);
 

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

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
            </intent-filter>
        </activity>
        <activity-alias
            android:name="com.example.wen.icontest.ActivityAlias1"
            android:enabled="true"
            android:icon="@mipmap/ic_1"
            android:label="@string/app_name"
            android:targetActivity=".MainActivity" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity-alias>
        <activity-alias
            android:name="com.example.wen.icontest.ActivityAlias2"
            android:enabled="false"
            android:icon="@mipmap/ic_2"
            android:label="@string/app_name"
            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>