我有一个检查网站更新的服务，我希望它能在发现更新时引起振动，即使屏幕关闭或锁定。
目前只有在屏幕没有关闭/锁定时才会有震动。即使屏幕关闭/锁定，所有其他功能都可以正常工作。
Vibrator vibrator = (Vibrator) getSystemService(VIBRATOR_SERVICE);
long[] pattern = new long[]{0, 400, 200, 400};
if (Build.VERSION.SDK_INT >= 26) { // New API
vibrator.vibrate(VibrationEffect.createWaveform(pattern,0));
} else { // Old API
vibrator.vibrate(pattern, 0);
}
即使手机屏幕关闭，我该如何使其震动？我尝试使用WakeLock，但貌似这不是问题的原因。
当屏幕开启时，一切都正常，我已经设置好了所有权限。
Handler handlerVibrate;
Vibrator vibrator;
private void vibrate(){
// this handler will keep vibrator running even with screen off (vibrator stops when the phone has the screen off)
vibrator = (Vibrator) getSystemService(Context.VIBRATOR_SERVICE);
handlerVibrate = new Handler();
handlerVibrate.post(new Runnable() {
@Override
public void run() {
if(vibrator != null) {
Log.d("mainActivity", "handler");
long[] pattern = {0, 500, 500};
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
vibrator.vibrate(VibrationEffect.createWaveform(pattern, 0)); // repeat at index 0
} else {
//deprecated in API 26
vibrator.vibrate(pattern, 0); // repeat at index 0
}
}
if(CONDITIONS TO STOP/CONTINUE){
// keep launching so that it keeps vibrating even with the screen off
handlerVibrate.postDelayed(this, 1000);
} else {
if(vibrator != null) {
vibrator.cancel();
}
}
}
});
}
WorkManager或前台服务。否则，它们可能无法按预期执行，因为系统会在一定时间后将它们杀死。public class ScreenReceiver extends BroadcastReceiver {
public static boolean wasScreenOn = true;
@Override
public void onReceive(Context context, Intent intent) {
if (intent.getAction().equals(Intent.ACTION_SCREEN_OFF)) {
// DO WHATEVER YOU NEED TO DO HERE
Vibrator v = (Vibrator) getSystemService(Context.VIBRATOR_SERVICE);
long[] pattern = new long[]{0, 400, 200, 400};
// Only perform this pattern one time (-1 means "do not repeat")
v.vibrate(pattern, -1);
wasScreenOn = false;
} else if (intent.getAction().equals(Intent.ACTION_SCREEN_ON)) {
// AND DO WHATEVER YOU NEED TO DO HERE
wasScreenOn = true;
}
}
}
public class ExampleActivity extends Activity {
@Override
protected void onCreate() {
// INITIALIZE RECEIVER
IntentFilter filter = new IntentFilter(Intent.ACTION_SCREEN_ON);
filter.addAction(Intent.ACTION_SCREEN_OFF);
BroadcastReceiver mReceiver = new ScreenReceiver();
registerReceiver(mReceiver, filter);
// YOUR CODE
}
@Override
protected void onPause() {
// WHEN THE SCREEN IS ABOUT TO TURN OFF
if (ScreenReceiver.wasScreenOn) {
// THIS IS THE CASE WHEN ONPAUSE() IS CALLED BY THE SYSTEM DUE TO A SCREEN STATE CHANGE
System.out.println("SCREEN TURNED OFF");
} else {
// THIS IS WHEN ONPAUSE() IS CALLED WHEN THE SCREEN STATE HAS NOT CHANGED
}
super.onPause();
}
@Override
protected void onResume() {
// ONLY WHEN SCREEN TURNS ON
if (!ScreenReceiver.wasScreenOn) {
// THIS IS WHEN ONRESUME() IS CALLED DUE TO A SCREEN STATE CHANGE
System.out.println("SCREEN TURNED ON");
} else {
// THIS IS WHEN ONRESUME() IS CALLED WHEN THE SCREEN STATE HAS NOT CHANGED
}
super.onResume();
}
}
参考资料:
https://thinkandroid.wordpress.com/2010/01/24/handling-screen-off-and-screen-on-intents/
根据您的解释
我有一个服务，用于检查我的网站上的更新
您以某种频率检查网站的更新。在尝试连接服务器之前，请确保获取唤醒锁定，否则您的应用程序将无法连接到互联网。
如果屏幕关闭时无法获取唤醒锁定，您也可以尝试通过显示通知或按照this answer来编程地打开屏幕。
我认为问题可能是因为您可能在检测到更新后尝试获取唤醒锁定。