1 通过禁用组件和启用组件更换

1.1 配置Activity

<activity
    android:name=".tztCommHeadPageActivity"
    android:configChanges="orientation|keyboardHidden|fontScale|screenSize"
    android:label="@string/tzt_app_name"
    android:screenOrientation="portrait"
    android:theme="@style/tzt_HeadPage_Theme.White">
    <intent-filter>
        <action android:name="android.intent.action.MAIN" />
        <category android:name="android.intent.category.LAUNCHER" />
    </intent-filter>
</activity>

1.2 配置多个icon

Android可以配置多个activity-alias标签 来为指定activity设置多个引用
targetActivity指定点击图标后响应的Activity， name属性为activity-alias唯一标识，java代码中通过该参数获得该activity引用

        <activity
            android:name=".activity.SplashActivity"
            android:hardwareAccelerated="true"
            android:screenOrientation="portrait"
            android:theme="@style/AppThemeTransparentBackground">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
            <meta-data
                android:name="android.app.shortcuts"
                android:resource="@xml/shortcuts" />
        </activity>

        <activity-alias
            android:name=".activity.Test11"
            android:enabled="true"
            android:icon="@drawable/ic_au"
            android:label="双11"
            android:targetActivity=".activity.SplashActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
            <meta-data
                android:name="android.app.shortcuts"
                android:resource="@xml/shortcuts" />
        </activity-alias>

1.3 changeIcon

利用PackageManager.setComponentEnabledSetting

/**
 * 启用组件 * 
 * @param componentName
 * 重要方法
 */
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);
}

/**
 * 禁用组件 * 
 * @param componentName
 * 重要方法
 */
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);
}

然后调用方法就可以了

private void initLauncherIcon() {
        ComponentName mDefault =getComponentName();
        ComponentName mEday11 = new ComponentName(
                getBaseContext(),
                "com.xx.xx.activity.Test11");
        ComponentName mEday65 = new ComponentName(
                getBaseContext(),
                "com.xx.xx.activity.Test65");
        mPm = getApplicationContext().getPackageManager();
        changeIcon65(mDefault, mEday65);
    }

    public void changeIcon65(ComponentName disable, ComponentName enable) {
        disableComponent(disable);
        enableComponent(enable);
    }

注意：

• PackageManager.DONT_KILL_APP 不会立即杀死进程，所以替换时会等待几秒钟才会生效。
• pm.setComponentEnabledSetting(componentName,PackageManager.COMPONENT_ENABLED_STATE_DISABLED,0);这里参数传0，可以立即杀死进程，并及时更换icon（一般我们使用这个方式）

2 隐藏app图标以及隐式启动

2.1 隐藏APP桌面图标

在启动的activity的AndroidManifest注册中，添加隐式启动的data：

<data android:host="TestActivity" android:scheme="cn.fly2think.activity" />

在入口Activity处添加申明

<data android:host="TestActivity" android:scheme="cn.fly2think.activity"
                    tools:ignore="AppLinkUrlError" />

    <application
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name" >
        <activity
            android:name="cn.fly2think.activity.TestActivity"
            android:label="@string/app_name"
            android:theme="@style/AppTheme" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <data android:host="TestActivity" android:scheme="cn.fly2think.activity"
                    tools:ignore="AppLinkUrlError" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

    </application>

1.2 通过另一个APP隐式启动

    public void starAct() {
        Intent intent = new Intent();
        ComponentName cn = new ComponentName("com.fly2think.yiilock",
                "cn.fly2think.activity.TestActivity");
        intent.setComponent(cn);
        Uri uri = Uri.parse("cn.fly2think.activity.TestActivity");
        intent.setData(uri);
        startActivity(intent);
    }

参考

Android动态修改icon
【Android】隐藏app图标以及隐式启动其他APP