Android-AlarmManager设置报警之间的随机延迟

我希望每x小时运行一次代码，但我也希望在触发代码之间保持一些随机性

我试图通过设置和取消一些随机延迟来使用AlarmManager，但我没有成功地使它工作

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有什么办法吗？

将此添加到manifest.xml中

<receiver android:name=".BroadcastReceiverAux" />

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从

我设法找到了这样做的方法。我正在分享代码，以防你也需要它

AndroidManifest.xml：

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.tribta.test">

    <uses-permission android:name="android.permission.WAKE_LOCK"/>
    <uses-permission android:name="android.permission.VIBRATE"/>
    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="test"
        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:process=":remote" android:name=".Alarm"></receiver>
        <service
            android:name=".MyService"
            android:enabled="true"
            android:process=":my_service" >
        </service>
    </application>
</manifest>

package com.tribta.test;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;

public class MainActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState){

        super.onCreate(savedInstanceState);
        Intent serviceIntent = new Intent(this,MyService.class);
        this.startService(serviceIntent);
    }

    @Override
    public void onDestroy(){
        super.onDestroy();
    }
}

package com.tribta.test;

import android.app.Service;
import android.content.Intent;
import android.os.IBinder;

public class MyService extends Service
{
    Alarm alarm = new Alarm();
    public void onCreate()
    {
        super.onCreate();
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId)
    {
        alarm.setAlarm(this);
        return START_STICKY;
    }

    @Override
    public void onStart(Intent intent, int startId)
    {
        alarm.setAlarm(this);
    }

    @Override
    public IBinder onBind(Intent intent)
    {
        return null;
    }
}

MyService.java：

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.tribta.test">

    <uses-permission android:name="android.permission.WAKE_LOCK"/>
    <uses-permission android:name="android.permission.VIBRATE"/>
    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="test"
        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:process=":remote" android:name=".Alarm"></receiver>
        <service
            android:name=".MyService"
            android:enabled="true"
            android:process=":my_service" >
        </service>
    </application>
</manifest>

package com.tribta.test;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;

public class MainActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState){

        super.onCreate(savedInstanceState);
        Intent serviceIntent = new Intent(this,MyService.class);
        this.startService(serviceIntent);
    }

    @Override
    public void onDestroy(){
        super.onDestroy();
    }
}

package com.tribta.test;

import android.app.Service;
import android.content.Intent;
import android.os.IBinder;

public class MyService extends Service
{
    Alarm alarm = new Alarm();
    public void onCreate()
    {
        super.onCreate();
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId)
    {
        alarm.setAlarm(this);
        return START_STICKY;
    }

    @Override
    public void onStart(Intent intent, int startId)
    {
        alarm.setAlarm(this);
    }

    @Override
    public IBinder onBind(Intent intent)
    {
        return null;
    }
}

Alarm.java，您可以在其中放置代码：

package com.tribta.test;

import android.app.AlarmManager;
import android.app.PendingIntent;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.os.PowerManager;
import android.os.Vibrator;
import android.widget.Toast;

import java.util.Random;

public class Alarm extends BroadcastReceiver
{
    @Override
    public void onReceive(Context context, Intent intent)
    {
        PowerManager pm = (PowerManager) context.getSystemService(Context.POWER_SERVICE);
        PowerManager.WakeLock wl = pm.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, "");
        wl.acquire();

        // Put here YOUR code.
        Toast.makeText(context, "Alarm !!!!!!!!!!", Toast.LENGTH_LONG).show(); // For example

        Vibrator v = (Vibrator) context.getSystemService(Context.VIBRATOR_SERVICE);
        v.vibrate(300); // Vibrate for 300 milliseconds

        cancelAlarm(context);
        setAlarm(context);

        wl.release();
    }

    public void setAlarm(Context context)
    {
        AlarmManager am =( AlarmManager)context.getSystemService(Context.ALARM_SERVICE);
        Intent i = new Intent(context, Alarm.class);
        PendingIntent pi = PendingIntent.getBroadcast(context, 0, i, 0);

        Random r = new Random();
        int ri = r.nextInt(7 - 1) + 1; // random integer between 7 (inclusive) and 1 (exclusive),
        int delay = 1000 * 60 * 60 * ri; // Millisec * Second * Minute * hours

        am.set(AlarmManager.RTC_WAKEUP, System.currentTimeMillis() + delay, pi);
    }

    public void cancelAlarm(Context context)
    {
        Intent intent = new Intent(context, Alarm.class);
        PendingIntent sender = PendingIntent.getBroadcast(context, 0, intent, 0);
        AlarmManager alarmManager = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
        alarmManager.cancel(sender);
    }
}

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我编辑了这个问题以显示我的接收者。在android名称前加上“.”。这可能就是问题所在。顺便说一句，你的意图是什么？我想这没什么区别。目的是描述要执行的操作。我从未使用显式操作调用brodcast Receiver。意向alarmclass=新意向（上下文，BroadcastReceiverAux.class）；试着用这种方式设置意图。顺便说一句，你们知道“设置”方法实际上是在设置不精确的报警，对吗？您设置了3秒后，但为了节省电池，它可能会在几分钟后调用。尝试设置“setexact”以检查应用程序中的其他内容是否正确。