防止我的 android 应用程序在 device/screen 为 sleeping/locked 时自动启动

Question

问题是，如果我的应用程序是运行并且设备（屏幕）被锁定，则应用程序会在设备锁定时重新启动（我知道，因为我可以在启动时听到我的应用程序的声音).

[编辑]

这看起来很复杂。我认为在应用程序中关闭声音会更容易，但我不知道如何仅在设备处于睡眠状态时执行此操作：

public void playSound(int id){
    if(!DEVICE_IS_ASLEEP())
        snds[id].play(soundID[id], 1, 1, 0, 0, 1);
}

Answer 1

您可以registerReceiver使用Context（可能在服务内部）

//assuming user starting Service by press smth in app (or simple open it), so the screen will be on for sure
boolean screenOn=true;

//put this inside your onCreate
private void initBroadcasts(){
    IntentFilter filter = new IntentFilter();
    filter.addAction(Intent.ACTION_SCREEN_ON);
    filter.addAction(Intent.ACTION_SCREEN_OFF);
    filter.addAction(Intent.ACTION_USER_PRESENT);
    //new feature from API 17 - screensaver (?)
    if(android.os.Build.VERSION.SDK_INT>=17){
        filter.addAction(Intent.ACTION_DREAMING_STARTED);
        filter.addAction(Intent.ACTION_DREAMING_STOPPED);
    }

    screenOn = getScreenUnlocked();
    this.registerReceiver(screenBroadcastReceiver, filter);
}

screenBroadcastReceiver 是一个 BroadcastReceiver，如下所示：

private BroadcastReceiver screenBroadcastReceiver = new BroadcastReceiver() {
    @Override
    public void onReceive(Context context, Intent myIntent) {
        if(myIntent.getAction().equals(Intent.ACTION_SCREEN_ON))
            screenOn=getScreenUnlocked();
        else if(myIntent.getAction().equals(Intent.ACTION_SCREEN_OFF))
            screenOn=false;
        else if(myIntent.getAction().equals(Intent.ACTION_USER_PRESENT))
            screenOn=true;
        else if(android.os.Build.VERSION.SDK_INT>=17){
            if(myIntent.getAction().equals(Intent.ACTION_DREAMING_STARTED))
                screenOn=false;
            else if(myIntent.getAction().equals(Intent.ACTION_DREAMING_STOPPED))
                screenOn=getScreenUnlocked();
        }
    }
};

检查屏幕是否解锁：

private boolean getScreenUnlocked(){
    KeyguardManager kgMgr = 
            (KeyguardManager) getSystemService(Context.KEYGUARD_SERVICE);
    return !kgMgr.inKeyguardRestrictedInputMode();
}

Answer 2

当屏幕锁定等应用发生配置更改时，activity 会重新启动。你会在 Whosebug 上得到很多答案来避免这个问题，比如 this; but according to Google Engineers, it is bad practice to retain the activity. You will get the proper answer about how to avoid this problem here

防止我的 android 应用程序在 device/screen 为 sleeping/locked 时自动启动

Prevent my android app starts automatically when the device/screen is sleeping/locked

android

screen

locked

sleep-mode