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当用户按下电源按钮（ - >屏幕关闭）时，我试图保存当前电池电量。锁定屏幕不工作时保存当前电池电量
起初我有这将启动每当手机启动的广播接收机。它的任务是启动一个服务，该服务创建另一个广播接收器用于屏蔽/打开意图（因为在清单中指定屏幕关闭意图不会工作，我通过此服务动态创建它）
MyStartupReceiver
public class MyStartupReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context c, Intent i) {
if(i.getAction().equals(Intent.ACTION_BOOT_COMPLETED))
{
Log.d("Boot completed", "Boot completed");
c.startService(new Intent(c, CreateReceiverService.class));
}
}
}
CreateReceiverService
public class CreateReceiverService extends Service {
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
// TODO Auto-generated method stub
IntentFilter filter = new IntentFilter(Intent.ACTION_SCREEN_OFF);
filter.addAction(Intent.ACTION_USER_PRESENT);
filter.addAction(Intent.ACTION_BATTERY_CHANGED);
BroadcastReceiver mReceiver = new ScreenReceiver();
registerReceiver(mReceiver, filter);
Log.d("Service", "Receiver registered");
return super.onStartCommand(intent, flags, startId);
}
而这里的ScreenRece艾弗
public class ScreenReceiver extends BroadcastReceiver {
private int lastBatteryLevel;
@Override
public void onReceive(Context c, Intent i) {
if(i.getAction().equals(Intent.ACTION_USER_PRESENT))
{
Log.d("Screen unlock", "Screen unlock");
}
else if(i.getAction().equals(Intent.ACTION_SCREEN_OFF))
{
Log.d("Screen off", "Screen off");
Intent s = new Intent(c, ActionService.class);
s.putExtra("LVL", lastBatteryLevel);
c.startService(s);
}
else if(i.getAction().equals(Intent.ACTION_BATTERY_CHANGED))
{
lastBatteryLevel = i.getIntExtra(BatteryManager.EXTRA_LEVEL, -1);
Log.d("Battery changed", "level = "+lastBatteryLevel);
}
}
现在我的问题： 的ActionService应该节省电池电量，以一个首选项文件： ActionService
public class ActionService extends Service {
private SharedPreferences p = PreferenceManager.getDefaultSharedPreferences(this);
Editor e = p.edit();
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
// TODO Auto-generated method stub
e.putInt("LOCKLVL", intent.getIntExtra("LVL", -1));
e.commit();
Log.d("Saved preference", "saved "+p.getInt("LOCKLVL", -1));
return super.onStartCommand(intent, flags, startId);
}
的问题是，接收到屏幕关闭意图时什么也没发生 - 我的ActionService，应该保存电池电量，不叫。
我logcat的输出是：
Receiver registered
Screen off
和没有输出 ActionService的Log.d（ “保存偏好”， “拯救 ”+ p.getInt（“ LOCKLVL”，-1） ）;
我甚至尝试设置激活锁定这样的： ScreenReceiver
else if(i.getAction().equals(Intent.ACTION_SCREEN_OFF))
{
WakelockHelper.acquireCpuWakeLock(c); //WAKELOCK TRY
Log.d("Screen off", "Screen off"); //OUTPUT OK
Intent s = new Intent(c, ActionService.class);
s.putExtra("LVL", lastBatteryLevel);
c.startService(s); //NOT CALLED
}
，并释放其偏好保存后。 但这并没有改变任何东西。
只要是完整的，这是我WakelockHelper
类public class WakelockHelper {
private static PowerManager.WakeLock sCpuWakeLock;
static void acquireCpuWakeLock(Context context) {
if (sCpuWakeLock != null) {
return;
}
PowerManager pm = (PowerManager) context.getSystemService(Context.POWER_SERVICE);
sCpuWakeLock = pm.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK,"Tag");
sCpuWakeLock.acquire();
Log.i("Wakelock", "Wakelock set");
}
static void releaseCpuLock() {
if (sCpuWakeLock != null) {
sCpuWakeLock.release();
sCpuWakeLock = null;
Log.i("Wakelock", "Wakelock released");
}
}
}
所以，我怎么能保存在用户锁定手机当前电池电量？ 为什么我的服务无法在屏幕截图后启动？ 为什么wakelock没有改变什么？
谢谢！