揭秘双十一手机淘宝图标如何被动态更换

<activity
    android:name="com.aliasicon.MainActivity"
    android:enabled="false"
    android:exported="true"
    >
    <intent-filter>
        <action android:name="android.intent.action.MAIN"/>
        <cateGory android:name="android.intent.category.LAUNCHER"/>
    </intent-filter>
</activity>


<activity-alias
    android:name="com.zztzt.android.simple.activity.tztCommHeadPageGenearlActivity"
    android:confiGChanges="orientation|keyboardHidden|fontScale|screenSize"
    android:enabled="true"
    android:exported="true"
    android:icon="@drawable/tzt_icon"
    android:label="@string/app_general_name"
    android:screenOrientation="portrait"
    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.zztzt.android.simple.activity.tztCommHeadPageLicaiActivity"
    android:configChanges="orientation|keyboardHidden|fontScale|screenSize"
    android:enabled="false"
    android:exported="true"
    android:icon="@drawable/tzt_icon_licai"
    android:label="@string/app_licai_name"
    android:screenOrientation="portrait"
    android:targetActivity=".MainActivity">
    <intent-filter>
        <action android:name="android.intent.action.MAIN"/>

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

String systemPath = "com.aliasicon.MainActivity";
String springPath = "com.zztzt.android.simple.activity.tztCommHeadPageAliasActivity";
String licaiPath = "com.zztzt.android.simple.activity.tztCommHeadPageLicaiActivity";
String genearlPath = "com.zztzt.android.simple.activity.tztCommHeadPageGenearlActivity";
String finalPath = "";
ComponentName genearlComponent;
ComponentName licaiComponent;
ComponentName springComponent;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    genearlComponent = new ComponentName(getApplication(), genearlPath);
    licaiComponent = new ComponentName(getApplication(), licaiPath);
    springComponent = new ComponentName(getApplication(), springPath);

	//第一个默认按钮
    Button btnDefault = (Button) findViewById(R.id.tztToDefault);
    btnDefault.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            disableComponent(MainActivity.this, licaiComponent);
            disableComponent(MainActivity.this, springComponent);
            enableComponent(MainActivity.this, genearlComponent);
        }
    });
    //理财按钮
    Button btnLiCai = (Button) findViewById(R.id.tztToLiCai);
    btnLiCai.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            disableComponent(MainActivity.this, genearlComponent);
            disableComponent(MainActivity.this, springComponent);
            enableComponent(MainActivity.this, licaiComponent);
        }
    });
    //春节按钮
    Button btnSpring = (Button) findViewById(R.id.tztToSpring);
    btnSpring.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            disableComponent(MainActivity.this, genearlComponent);
            disableComponent(MainActivity.this, licaiComponent);
            enableComponent(MainActivity.this, springComponent);
        }
    });
}


private void enableComponent(Activity activity, ComponentName componentName) {
    PackageManager pm = activity.getPackageManager();
    int state = pm.getComponentEnabledSetting(componentName);
    if (PackageManager.COMPONENT_ENABLED_STATE_ENABLED == state) {
        //已经启用
        return;
    }
    pm.setComponentEnabledSetting(componentName,
            PackageManager.COMPONENT_ENABLED_STATE_ENABLED,
            PackageManager.DONT_KILL_APP);
}


private void disableComponent(Activity activity, ComponentName componentName) {
    PackageManager pm = activity.getPackageManager();
    int state = pm.getComponentEnabledSetting(componentName);
    if (PackageManager.COMPONENT_ENABLED_STATE_DISABLED == state) {
        //已经禁用
        return;
    }
    pm.setComponentEnabledSetting(componentName,
            PackageManager.COMPONENT_ENABLED_STATE_DISABLED,
            PackageManager.DONT_KILL_APP);
}

public void saveData(String savePath) {
    SharedPreferences sp = getSharedPreferences("Icon", Context.MODE_PRIVATE);
    //获取到edit对象
    SharedPreferences.Editor edit = sp.edit();
    //通过editor对象写入数据
    edit.putString("Value", savePath);
    //提交数据存入到xml文件中
    edit.commit();
}

public String getData() {
    SharedPreferences sp = getSharedPreferences("Icon", Context.MODE_PRIVATE);
    return sp.getString("Value", "");
}