android – PowerManager wakelock没有从服务中唤醒设备
作者:互联网
我有一个应用程序,每分钟都有一个后台服务.如果它处于睡眠状态,我希望服务唤醒设备.我使用的是PowerManager,但设备没有唤醒.有什么想法吗?提前致谢.
@Override
protected void onHandleIntent(Intent intent) {
PowerManager pm = (PowerManager) getSystemService(Context.POWER_SERVICE);
PowerManager.WakeLock wl = pm.newWakeLock(PowerManager.FULL_WAKE_LOCK,
"My Tag");
wl.acquire();
// do work as device is awake
wl.release();
}
[EDIT1]
这就是我从Activity启动服务的方式.
// get a Calendar object with current time
Calendar cal = Calendar.getInstance();
// add 5 minutes to the calendar object
cal.add(Calendar.MINUTE, 1);
Intent intent = new Intent(getApplicationContext(), AlarmReceiver.class);
intent.putExtra("alarm_message", "sending outstanding transactions");
// In reality, you would want to have a static variable for the
// request code instead of 192837
PendingIntent sender = PendingIntent.getBroadcast(
getApplicationContext(), 192837, intent,
PendingIntent.FLAG_UPDATE_CURRENT);
// Get the AlarmManager service
AlarmManager am = (AlarmManager) getSystemService(ALARM_SERVICE);
// am.set(AlarmManager.RTC_WAKEUP, cal.getTimeInMillis(), sender);
// 86400000 = 24 hours
// 43200000 = 12 hours
// 3600000 = 1hr
// 1800000 = 30 mins
// 300000 = 5 mins
am.setRepeating(AlarmManager.RTC_WAKEUP, cal.getTimeInMillis(),60000,sender);
AlarmReceiver类
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.widget.Toast;
import android.os.Bundle;
public class AlarmReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
try {
Bundle bundle = intent.getExtras();
String message = bundle.getString("alarm_message");
// Toast.makeText(context, message, Toast.LENGTH_SHORT).show();
Intent myIntent = new Intent(context,
SendOutstandingTransactions.class);
myIntent.setAction("com.carefreegroup.startatboot.MyService");
context.startService(myIntent);
} catch (Exception e) {
Toast.makeText(
context,
"There was an error somewhere, but we still received an alarm",
Toast.LENGTH_SHORT).show();
e.printStackTrace();
}
}
}
以下类调用我想在设备处于睡眠状态时启动的Activity.
SendOutstandingTransactions IntentService.
protected void onHandleIntent(Intent intent) {
PowerManager pm = (PowerManager) getSystemService(Context.POWER_SERVICE);
PowerManager.WakeLock wl = pm.newWakeLock(PowerManager.FULL_WAKE_LOCK,
"My Tag");
wl.acquire();
if (hasMessageDisplayed == false) {
Intent i = new Intent(this, DisplayMessageActivity.class);
i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(i);
}
wl.release();
}
[EDIT2]
@Override
public void onDestroy() {
super.onDestroy();
PowerManager pm = (PowerManager) this.getSystemService(Context.POWER_SERVICE);
PowerManager.WakeLock wl = pm.newWakeLock(
PowerManager.PARTIAL_WAKE_LOCK, "com.something.alarm");
// Acquire the lock
if (wl.isHeld()) wl.release();
}
解决方法:
要么使用Commonsware的WakefulIntentService,要么这样做:
class YourService extends IntentService {
private static final String LOCK_NAME = YourService.class.getName()
+ ".Lock";
private static volatile WakeLock lockStatic = null; // notice static
synchronized private static PowerManager.WakeLock getLock(Context context) {
if (lockStatic == null) {
PowerManager mgr = (PowerManager) context
.getSystemService(Context.POWER_SERVICE);
lockStatic = mgr.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK,
LOCK_NAME);
lockStatic.setReferenceCounted(true);
}
return (lockStatic);
}
public static void startYourService(Context ctxt, Intent i) { // STATIC
getLock(ctxt.getApplicationContext()).acquire();
ctxt.startService(i);
}
public YourService(String name) {
super(name);
setIntentRedelivery(true);
}
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
PowerManager.WakeLock lock = getLock(this.getApplicationContext());
if (!lock.isHeld() || (flags & START_FLAG_REDELIVERY) != 0) {
lock.acquire();
}
super.onStartCommand(intent, flags, startId);
return (START_REDELIVER_INTENT);
}
@Override
protected void onHandleIntent(Intent intent) {
try {
// do your thing
} finally {
PowerManager.WakeLock lock = getLock(this.getApplicationContext());
if (lock.isHeld()) lock.release();
}
}
}
在你的接收器中:
Bundle bundle = intent.getExtras();
String message = bundle.getString("alarm_message");
// Toast.makeText(context, message, Toast.LENGTH_SHORT).show();
Intent myIntent = new Intent(context, SendOutstandingTransactions.class);
myIntent.setAction("com.carefreegroup.startatboot.MyService");
YourService.startYourService(context, myIntent)
这实际上是@CommonsWare WakefulIntentService的核心(不确定START_FLAG_REDELIVERY,我应该问其中一天)
标签:power-management,android,android-wake-lock 来源: https://codeday.me/bug/20190927/1824546.html