sendWakefulWork 并不总是使用 cwac-wakeful-1.1.0 调用

Question

我有一个问题很久了，我发现了 cwac-wakeful，它可以解决我所有的问题。我想... ：'（ 简而言之，为了解决这个问题，我实现了一个最简单的应用程序，它每 60 秒安排一次警报，并且每次都记录一次。 这是我的代码：

主要活动：

package com.par.hasard.mysimpleapplication;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Button button = (Button)findViewById(R.id.myExportButton);
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                MyLogManager.copyLogToClipboard(view.getContext());
                MyLogManager.emptyLogFile(view.getContext());
            }
        });
        try {
            MyLogManager.createLogFile(this);
            MyLogManager.write(this, "Application launched\n");
            MyAlarmPlanner.planAlarm_v2(this);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

MyAlarmPlanner：

package com.par.hasard.mysimpleapplication;

import android.app.AlarmManager;
import android.app.PendingIntent;
import android.content.Context;
import android.content.Intent;
import android.os.SystemClock;
import android.widget.Toast;
import com.commonsware.cwac.wakeful.WakefulIntentService;
import java.io.IOException;

public class MyAlarmPlanner {
    public static void planAlarm_v2(Context context) throws IOException {
        MyLogManager.write(context, "Beginning of planAlarm_v2\n");
        WakefulIntentService.scheduleAlarms(new MyAppListener(), context, true);
        MyLogManager.write(context, "End of planAlarm_v2\n");
    }
}

MyAppListener：

package com.par.hasard.mysimpleapplication;

import android.app.AlarmManager;
import android.app.PendingIntent;
import android.content.Context;
import android.os.SystemClock;

import com.commonsware.cwac.wakeful.AlarmReceiver;
import com.commonsware.cwac.wakeful.WakefulIntentService;

import java.io.IOException;

public class MyAppListener implements WakefulIntentService.AlarmListener {
    @Override
    public void scheduleAlarms(AlarmManager alarmManager, PendingIntent pendingIntent, Context context) {
        try {
            MyLogManager.write(context, "Beginning of scheduleAlarms\n");
            alarmManager.setExact(AlarmManager.ELAPSED_REALTIME_WAKEUP, SystemClock.elapsedRealtime()+60000, pendingIntent);
            MyLogManager.write(context, "End of scheduleAlarms\n");
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    @Override
    public void sendWakefulWork(Context context) {
        try {
            MyLogManager.write(context, "Beginning of sendWakefulWork\n");
            WakefulIntentService.sendWakefulWork(context, MyAppService.class);
            MyLogManager.write(context, "End of sendWakefulWork\n");
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    @Override
    public long getMaxAge(Context context) {
        return (AlarmManager.INTERVAL_FIFTEEN_MINUTES * 2);
    }
}

我的应用服务：

package com.par.hasard.mysimpleapplication;
import android.content.Intent;
import com.commonsware.cwac.wakeful.WakefulIntentService;
import java.io.IOException;

public class MyAppService extends WakefulIntentService {
    public MyAppService(){
        super("MyAppService");
    }

    @Override
    protected void doWakefulWork(Intent intent) {
        try {
            MyLogManager.write(this, "Beginning of doWakefulWork\n");
            MyAlarmPlanner.planAlarm_v2(this);
            MyLogManager.write(this, "End of doWakefulWork\n");
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

清单：

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.par.hasard.mysimpleapplication">
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
    <uses-permission android:name="android.permission.WAKE_LOCK" />


    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity 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="com.par.hasard.mysimpleapplication.MySimpleWakefulReceiver">
            <intent-filter android:priority="1">
                <action android:name="com.par.hasard.mysimpleapplication.REGULAR_ALARM" />
            </intent-filter>
        </receiver>

        <receiver android:name="com.commonsware.cwac.wakeful.AlarmReceiver">
            <intent-filter>
                <action android:name="android.intent.action.BOOT_COMPLETED"/>
            </intent-filter>

            <meta-data
                android:name="com.commonsware.cwac.wakeful"
                android:resource="@xml/wakeful"/>
        </receiver>
        <service android:enabled="true" android:name="com.par.hasard.mysimpleapplication.MySimpleWakefulService" />
        <service android:enabled="true" android:name="com.par.hasard.mysimpleapplication.MyAppService" />
    </application>

</manifest>

wakeful.xml：

<WakefulIntentService
    listener="com.par.hasard.mysimpleapplication.MyAppListener"
    />

所有这些都可以完美运行，但有时它不会记录任何内容。我认为这是由于我的手机（Sony Xperia）的睡眠模式。但它似乎在其他手机上具有相同的行为。 以下是日志示例：

18/12 2h47m37s304 => Beginning of sendWakefulWork
18/12 2h47m37s311 => End of sendWakefulWork
18/12 2h47m37s316 => Beginning of doWakefulWork
18/12 2h47m37s317 => Beginning of planAlarm_v2
18/12 2h47m37s320 => Beginning of scheduleAlarms
18/12 2h47m37s322 => End of scheduleAlarms
18/12 2h47m37s323 => End of planAlarm_v2
18/12 2h47m37s324 => End of doWakefulWork
18/12 2h48m37s332 => Beginning of sendWakefulWork
18/12 2h48m37s338 => End of sendWakefulWork
18/12 2h48m37s347 => Beginning of doWakefulWork
18/12 2h48m37s348 => Beginning of planAlarm_v2
18/12 2h48m37s350 => Beginning of scheduleAlarms
18/12 2h48m37s351 => End of scheduleAlarms
18/12 2h48m37s352 => End of planAlarm_v2
18/12 2h48m37s353 => End of doWakefulWork
18/12 3h35m6s293 => Beginning of sendWakefulWork    //nothing before ??
18/12 3h35m6s298 => End of sendWakefulWork
18/12 3h35m6s319 => Beginning of doWakefulWork
18/12 3h35m6s327 => Beginning of planAlarm_v2
18/12 3h35m6s331 => Beginning of scheduleAlarms
18/12 3h35m6s338 => End of scheduleAlarms
18/12 3h35m6s340 => End of planAlarm_v2
18/12 3h35m6s345 => End of doWakefulWork
18/12 3h36m7s307 => Beginning of sendWakefulWork
18/12 3h36m7s313 => End of sendWakefulWork
18/12 3h36m7s319 => Beginning of doWakefulWork
18/12 3h36m7s320 => Beginning of planAlarm_v2
18/12 3h36m7s322 => Beginning of scheduleAlarms
18/12 3h36m7s323 => End of scheduleAlarms
18/12 3h36m7s324 => End of planAlarm_v2
18/12 3h36m7s325 => End of doWakefulWork

有人可以帮我吗？

Answer 1

就时间间隔而言，您很可能正在 Android 6.0+ 设备上体验打盹模式，或者某些制造商在旧设备上提供的等效模式（例如 SONY 的 STAMINA 模式）。除了将您的应用添加到适当的白名单中（例如，对于打盹，设置 > 应用 >（齿轮图标）> 特殊访问 > 电池优化），您可以做的很少。

欢迎您在 API 级别 23+ 设备上切换到 setExactAndAllowWhileIdle()，但是：

• 你不会每分钟都得到控制（我认为它仅限于每 9 分钟）

• 当您获得控制权时，您将无法访问 Internet（这可能是您真正尝试做的任何事情所必需的）

• 这对于制造商特定的 6.0 之前的设备没有帮助（因为该方法不存在）

总体而言，将您的应用设计为处理打盹模式，而不是假设它会在后台获得太多控制，是一种更可靠的方法。