Android 像素点Activity保活

在Android应用中开启一个1像素的Activity，由于Activity的级别是比较高的，所以开启1个像素的Activity的方式就可以保证进程是不容易被杀掉的，具体来说，定义一个1像素的Activity，在该Activity中动态注册自定义的广播。

不多说。直接上代码

public class OnePixelReceiver extends BroadcastReceiver {
    @Override
    public void onReceive(Context context, Intent intent) {
        if (intent.getAction().equals(Intent.ACTION_SCREEN_OFF)) {    //屏幕关闭启动1像素Activity
            Intent it = new Intent(context, OnePiexlActivity.class);
            it.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
            context.startActivity(it);
        } else if (intent.getAction().equals(Intent.ACTION_SCREEN_ON)) {   //屏幕打开 结束1像素
            context.sendBroadcast(new Intent("finish"));
            Intent main = new Intent(Intent.ACTION_MAIN);
            main.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
            main.addCategory(Intent.CATEGORY_HOME);
            context.startActivity(main);
        }
    }
}

下面创建一个一像素的Activity

public class OnePiexlActivity extends Activity {

    private BroadcastReceiver endReceiver;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        //设置1像素
        Window window = getWindow();
        window.setGravity(Gravity.LEFT | Gravity.TOP);
        WindowManager.LayoutParams params = window.getAttributes();
        params.x = 0;
        params.y = 0;
        params.height = 1;
        params.width = 1;
        window.setAttributes(params);

        //结束该页面的广播
        endReceiver = new BroadcastReceiver() {
            @Override
            public void onReceive(Context context, Intent intent) {
                finish();
            }
        };
        registerReceiver(endReceiver, new IntentFilter("finish"));
        //检查屏幕状态
        checkScreen();
    }

    @Override
    protected void onResume() {
        super.onResume();
        checkScreen();
    }

    /**
     * 检查屏幕状态  isScreenOn为true  屏幕“亮”结束该Activity
     */
    private void checkScreen() {

        PowerManager pm = (PowerManager) OnePiexlActivity.this.getSystemService(Context.POWER_SERVICE);
        boolean isScreenOn = pm.isScreenOn();
        if (isScreenOn) {
            finish();
        }else{


        }
    }
}

最后在你的MainActivity中

public class MainActivity extends AppCompatActivity {

    OnePixelReceiver mOnepxReceiver;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        mOnepxReceiver = new OnePixelReceiver();
        IntentFilter intentFilter = new IntentFilter();
        intentFilter.addAction("android.intent.action.SCREEN_OFF");
        intentFilter.addAction("android.intent.action.SCREEN_ON");
        intentFilter.addAction("android.intent.action.USER_PRESENT");
        registerReceiver(mOnepxReceiver, intentFilter);

    }
    }