让应用在息屏后保活

在网上了解了一个防止Service在息屏后被杀死的思路,就是监听屏幕亮灭的广播,在息屏的时候,开启1个像素的Activity,在屏幕亮的时候,马上关闭,做到用户无感知。下面贴出代码:

 mScreenStatusReceiver = new ScreenStatusReceiver();    
 IntentFilter screenStatus = newIntentFilter(Intent.ACTION_SCREEN_UP);    
 screenStatus.addAction(Intent.ACTION_SCREEN_OFF);    
 registerReceiver(mScreenStatusReceiver, screenStatus);  
 // 友情提示:切记要记得反注册unregist...哦

 

然后在屏幕广播中写入以下代码:

if(action.equals(Intent.ACTION_SCREEN_OFF)){
            // 当屏幕关闭时,启动一个像素的Activity
            Intent activity = new Intent(context,OnePxActivity.class);
            activity.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
            context.startActivity(activity);
} else if (action.equals(Intent.ACTION_SCREEN_ON)){
            // 用户解锁,关闭Activity
            // 这里发个广播是什么鬼,其实看下面OnePxAcitivity里面的代码就知道了,发这个广播就是为了finish掉OnePxActivity
            Intent broadcast = new Intent("FinishActivity");
            // broadcast.setFlags(32);Intent.FLAG_INCLUDE_STOPPED_PACKAGES
            context.sendBroadcast(broadcast);//发送对应的广播
}

 

以上代码中OnePxActivity就是我所说的1像素的Activity,(中国式英语OnePxActivity) 
下面贴出Activity的代码:

public class OnePxActivity extends Activity {
    protected BroadcastReceiver receiver = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {
            // 收到广播
            OnePxActivity.this.finish();
        }
    };

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        Window window = getWindow();
        // 设置窗口位置在左上角
        window.setGravity(Gravity.LEFT | Gravity.TOP);
        WindowManager.LayoutParams params = window.getAttributes();
        params.x = 0;
        params.y = 0;
        params.width = 1;
        params.height = 1;
        window.setAttributes(params);

        // 动态注册广播,这个广播是在屏幕亮的时候,发送广播,来关闭当前的Activity
        registerReceiver(receiver, new IntentFilter("FinishActivity"));

    }

    @Override
    protected void onDestroy() {
        unregisterReceiver(receiver);
        Log.e(TAG, TAG + "onDestory");
        super.onDestroy();
    }

}

 

OnPxActivity在清单文件(AndroidManifest.xml)中的配置

<activity 
            android:name=".activity.OnePxActivity"            
android:configChanges
="keyboardHidden|orientation|screenSize|navigation|keyboard" android:excludeFromRecents="true" android:exported="false" android:finishOnTaskLaunch="false" android:launchMode="singleInstance" android:process=":process" android:theme="@style/undeadActivityStyle" > </activity>

 

以下是activity的theme(/res/values/styles.xml),具体配置的意思再注释中已经写的很详细。

<style name="undeadActivityStyle">
        <!-- 背景设置为透明 -->
        <item name="android:windowBackground">@android:color/transparent</item>
        <!-- 是否有边框 -->
        <item name="android:windowFrame">@null</item>
        <item name="android:windowNoTitle">true</item>
        <!-- 是否浮动在界面上 -->
        <item name="android:windowIsFloating">true</item>
        <!-- 是否透明 -->
        <item name="android:windowIsTranslucent">true</item>
        <!-- 窗体上面是否有遮盖 -->
        <item name="android:windowContentOverlay">@null</item>
        <!-- 背景是否变暗 -->
        <item name="android:backgroundDimEnabled">false</item>
        <!-- 设置背景透明 -->
        <item name="android:windowIsTranslucent">true</item>
        <!-- 为窗体的Enter和Exit设置动画 -->
        <item name="android:windowAnimationStyle">@null</item>
        <!-- 是否禁止窗体显示前显示的View -->
        <item name="android:windowDisablePreview">true</item>
        <item name="android:windowNoDisplay">false</item>
    </style>

 

转: https://blog.csdn.net/cn_1937/article/details/53933073

 

posted @ 2018-08-21 11:10  云中雀  阅读(1886)  评论(0编辑  收藏  举报