即使Android手機處於鎖定模式/在鎖定屏幕上也要啟動活動

Question

即使手機處於鎖定模式，我如何也可以開始活動，以便可以訪問我的應用程序？

我想先使用ringAlarm()發出警報，然后轉到另一個活動，該活動將顯示alertdialog以停止警報。

如果手機處於活動狀態，它可以正常工作，但是當手機處於鎖定狀態時，它會不斷發出警報，並且在我解鎖手機時，停止警報按鈕不會激活。 請幫我。 預先感謝您的幫助。

這是我的代碼：

public class EAlarmReceiver extends BroadcastReceiver {
public static String sender;
public static String sms = "";
public static Ringtone r;
public void onReceive(Context context, Intent intent) {
    // TODO Auto-generated method stub
    Bundle bundle = intent.getExtras(); 
    Object[] pdusObj = (Object[]) bundle.get("pdus"); 
    SmsMessage[] messages = new SmsMessage[pdusObj.length]; 
    for (int i = 0; i<pdusObj.length; i++) 
    { 
            messages[i] = SmsMessage.createFromPdu ((byte[]) 
            pdusObj[i]); 
            sender = messages[i].getOriginatingAddress();
            sms = messages[i].getMessageBody();//save sms to string
    } 

    for (SmsMessage msg : messages) {
        if (msg.getMessageBody().contains("alert")) {

            Intent openStopAlarm = new Intent("proj.receiver.STOPALARM");
            openStopAlarm.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK|Intent.FLAG_ACTIVITY_NO_HISTORY);
            ringAlarm(context);
            context.startActivity(openStopAlarm);
            abortBroadcast();
        }//end if
    }//end for
}// end onreceive

//ring the alarm
public void ringAlarm(Context context)
{
     Uri alert = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_ALARM);
     if(alert == null){
         // alert is null, using backup
         alert = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);
         if(alert == null){  // 
             // alert backup is null, using 2nd backup
             alert = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_RINGTONE);               
         }
     }
     r = RingtoneManager.getRingtone(context.getApplicationContext(), alert);
     AudioManager audioManager = (AudioManager)context.getSystemService(Context.AUDIO_SERVICE);
     int maxVolumeAlarm = audioManager.getStreamMaxVolume(AudioManager.STREAM_ALARM);
     int maxVolumeRing = audioManager.getStreamMaxVolume(AudioManager.STREAM_RING);
     audioManager.setRingerMode(AudioManager.RINGER_MODE_NORMAL);
     audioManager.setStreamVolume(AudioManager.STREAM_ALARM, maxVolumeAlarm,AudioManager.FLAG_REMOVE_SOUND_AND_VIBRATE);
     audioManager.setStreamVolume(AudioManager.STREAM_RING, maxVolumeRing,AudioManager.FLAG_REMOVE_SOUND_AND_VIBRATE);
     r.play();
        Toast.makeText(context.getApplicationContext(), "alarm started", Toast.LENGTH_LONG).show();
}
//end ringAlarm()
}

我已經看過有關如何執行此操作的代碼，但是我不知道如何使用它。 所以我仍然有同樣的問題。 這是代碼。

public class DismissLock extends Activity {

PowerManager pm;
WakeLock wl;
KeyguardManager km;
KeyguardLock kl;

@Override
protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);
    Log.i("INFO", "onCreate() in DismissLock");
    pm = (PowerManager) getSystemService(Context.POWER_SERVICE);
    km=(KeyguardManager)getSystemService(Context.KEYGUARD_SERVICE);
    kl= km.newKeyguardLock("INFO");
    wl = pm.newWakeLock(PowerManager.FULL_WAKE_LOCK | PowerManager.ACQUIRE_CAUSES_WAKEUP|PowerManager.ON_AFTER_RELEASE, "INFO");
    wl.acquire(); //wake up the screen
    kl.disableKeyguard();// dismiss the keyguard

    setContentView(R.layout.main);
}

@Override
protected void onPause() {
    // TODO Auto-generated method stub
    super.onPause();
    wl.release(); 
}

@Override
protected void onResume() {
    // TODO Auto-generated method stub
    super.onResume();
    wl.acquire();//must call this!
}

}

Answer 1

您只需要設置一些其他的窗口標志：

getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON
        + WindowManager.LayoutParams.FLAG_DISMISS_KEYGUARD|
        + WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED|
        + WindowManager.LayoutParams.FLAG_TURN_SCREEN_ON);

資料來源： 默認鎖定屏幕上的Android活動

Answer 2

getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON
    + WindowManager.LayoutParams.FLAG_DISMISS_KEYGUARD|
    + WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED|
    + WindowManager.LayoutParams.FLAG_TURN_SCREEN_ON);

將上述代碼粘貼到您要在鎖定屏幕上執行的活動中。 將代碼放入oncreate（）;