Question

我正在使用处理程序反复提示用户输入每个例如5分钟。当设备进入休眠模式并且屏幕被锁定时，当我的应用提示用户输入时，如何唤醒设备？我试过这个，但似乎没有用。我在清单中添加了WAKE_LOCK权限。

class BtHandler extends Handler {
    private PowerManager pm;
    private WakeLock wl;

    @Override
    public void handleMessage(Message msg) {
        pm = (PowerManager)FixedNode.this.getSystemService(Context.POWER_SERVICE);
        if (!pm.isScreenOn()) {
            wl = pm.newWakeLock(PowerManager.FULL_WAKE_LOCK, "TAG");
            wl.acquire();
        }
        FixedNode.this.setAlwaysDiscoverable();
        wl.release();
    }
}

有什么想法吗？

编辑：使用AlarmManager广播自定义意图。

mReceiver = new BroadcastReceiver() {

    @Override
    public void onReceive(Context context, Intent intent) {
        Vibrator v = (Vibrator) getSystemService(Context.VIBRATOR_SERVICE);
        v.vibrate(300);
        PowerManager pm = (PowerManager) getSystemService(Context.POWER_SERVICE);
        KeyguardManager km = (KeyguardManager) getSystemService(Context.KEYGUARD_SERVICE);
        WakeLock wl = null;

        if (!pm.isScreenOn()) {
            KeyguardLock kl = km.newKeyguardLock("TAG");
            kl.disableKeyguard();
            wl = pm.newWakeLock(
                PowerManager.SCREEN_BRIGHT_WAKE_LOCK | 
                PowerManager.ACQUIRE_CAUSES_WAKEUP, "TAG");
            wl.acquire();
        }

        Toast.makeText(context, "Alarm worked", Toast.LENGTH_LONG).show();
        wl.release();
    }
};

mFilter = new IntentFilter(ACTION_NAME);

Intent mIntent = new Intent(ACTION_NAME);        
PendingIntent pendingIntent = PendingIntent.getBroadcast(this, 0, mIntent, 0);
AlarmManager am = (AlarmManager) getSystemService(ALARM_SERVICE);
am.set(AlarmManager.RTC_WAKEUP, System.currentTimeMillis() + (120 * 1000), pendingIntent);
Toast.makeText(this, "Alarm set", Toast.LENGTH_LONG).show();

Answer 1

通常wakelock实际开启屏幕。所以你应该用

获得唤醒锁

ACQUIRE_CAUSES_WAKEUP

作为附加标志。

Answer 2

查看AlarmManager类 http://developer.android.com/reference/android/app/AlarmManager.html 这就像“cron”

好的，这是一段工作代码 - 首先是活动类：

import android.app.Activity;
import android.app.AlarmManager;
import android.app.PendingIntent;
import android.content.Intent;
import android.os.Bundle;
import android.os.PowerManager;
import android.os.PowerManager.WakeLock;

public class MainActivity extends Activity {
    private WakeLock wl;

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        //acquire wake lock
        PowerManager pm = (PowerManager) getSystemService(POWER_SERVICE);
        wl = pm.newWakeLock(PowerManager.ACQUIRE_CAUSES_WAKEUP|PowerManager.SCREEN_BRIGHT_WAKE_LOCK, "TAG");
        wl.acquire();

        // schedule alarm
        Intent i = new Intent();
        i.setAction(WakeReciever.WAKE_INTENT);
        PendingIntent pIntent = PendingIntent.getBroadcast(this, 0, i, 0);

        AlarmManager am = (AlarmManager) getSystemService(ALARM_SERVICE);
        am.set(AlarmManager.RTC_WAKEUP, System.currentTimeMillis() + 120000,
                pIntent);
    }

    @Override
    protected void onPause() {
        wl.release();
        super.onPause();
    }

}

接下来是BroadcastReceiver：

package com.test;

import android.content.BroadcastReceiver;
import android.content.Intent;
import android.content.Context;
import android.os.PowerManager;
import android.os.PowerManager.WakeLock;

public class WakeReciever extends BroadcastReceiver {
    public static final String WAKE_INTENT = "com.test.WAKE"; 


    /**
     * @see android.content.BroadcastReceiver#onReceive(Context,Intent)
     */
    @Override
    public void onReceive(Context context, Intent intent) {
        //acquire wake lock

        PowerManager pm = (PowerManager) context.getSystemService(Context.POWER_SERVICE);
        WakeLock wl = pm.newWakeLock(PowerManager.FULL_WAKE_LOCK | PowerManager.ACQUIRE_CAUSES_WAKEUP, "TAG");
        wl.acquire();


        //start activity
        Intent i = new Intent();
        i.setClassName("com.test", "com.test.MainActivity");
        i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);

        context.startActivity(i);

        wl.release();
    }
}

最后不要忘记清单文件：

<?xml version="1.0" encoding="UTF-8"?>
<manifest android:versionCode="1" android:versionName="1.0"
    package="com.test" xmlns:android="http://schemas.android.com/apk/res/android">
    <uses-sdk android:minSdkVersion="8"/>
    <uses-permission android:name="android.permission.WAKE_LOCK"></uses-permission>
    <application android:icon="@drawable/icon" android:label="@string/app_name">
        <activity android:label="@string/app_name" android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN"/>
                <category android:name="android.intent.category.LAUNCHER"/>
            </intent-filter>
        </activity>
        <receiver android:name=".WakeReciever" android:enabled="true">
            <intent-filter>
                <action android:name="com.test.WAKE"></action>
            </intent-filter>
        </receiver>

    </application>
</manifest>

Answer 3

从我看到的情况来看，你在获取后立即释放唤醒锁。这就是为什么它给人的印象是不工作。将其移除并将其放在获取它的方法之外的其他位置。

mReceiver = new BroadcastReceiver() {

    @Override
    public void onReceive(Context context, Intent intent) {
        Vibrator v = (Vibrator) getSystemService(Context.VIBRATOR_SERVICE);
        v.vibrate(300);
        PowerManager pm = (PowerManager) getSystemService(Context.POWER_SERVICE);
        KeyguardManager km = (KeyguardManager) getSystemService(Context.KEYGUARD_SERVICE);
        WakeLock wl = null;

        if (!pm.isScreenOn()) {
            KeyguardLock kl = km.newKeyguardLock("TAG");
            kl.disableKeyguard();
            wl = pm.newWakeLock(
                PowerManager.SCREEN_BRIGHT_WAKE_LOCK | 
                PowerManager.ACQUIRE_CAUSES_WAKEUP, "TAG");
            wl.acquire();
        }

        Toast.makeText(context, "Alarm worked", Toast.LENGTH_LONG).show();
    }
};

当应用提示用户时唤醒设备

3 个答案: