Android 如何设置应用不显示桌面图标，不显示后台运行

1、Manifest文件修改MainActivity属性

<activity android:name=".MainActivity">
    <intent-filter>
        <action android:name="android.intent.action.MAIN" />
        <category android:name="android.intent.category.LAUNCHER" />
        <data android:host="@string/app_name"
            android:scheme="com.xxx.xxx.mainActivity"
            tools:ignore="AppLinkUrlError,ManifestResource"/>
    </intent-filter>
</activity>

2、修改MainActivity

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        moveTaskToBack(isFinishing());
        finish();
    }

@Override
protected void onResume() {
    moveTaskToBack(isFinishing());
    super.onResume();

}

@Override
protected void onNewIntent(Intent intent) {
    moveTaskToBack(isFinishing());
    super.onNewIntent(intent);
    finish();

}