Android实现防止被系统回收的Service

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Android实现防止被系统回收的Service

2024-07-06 13:41:44 224人阅读

MainActivity如下:

package cc.c;

import java.util.List;
import android.os.Bundle;
import android.os.Process;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.app.Activity;
import android.app.ActivityManager;
import android.app.ActivityManager.RunningAppProcessInfo;
import android.app.ActivityManager.RunningTaskInfo;
import android.content.ComponentName;
import android.content.Context;
/**
 * Demo描述:
 * 实现防止被系统回收的Service.
 * 在某些情况下Service会被系统kill掉.在网上找了不少方法,虽然都号称
 * 可以避免被系统回收,但貌似都不够可靠.
 * 在此换一种方式来实现,思路:
 * 利用AlarmManager定时间隔(比如5S,20S)来不断的startService().
 * (1)如果该服务被回收,那么会调用Service的onCreate()和onStart()
 * (2)如果未该服务被回收,则只会调用Service的onStart()
 * 利用该方式曲线实现防止被系统回收Service
 * 
 * 测试环境:
 * Android:2.3.6 + ME525+
 * 
 * 测试方法:
 * 1 部署应用到设备
 * 2 重启设备
 * 3 设备重启后,点击进入该应用.点击界面上的Button
 * 4 查看Log
 * 
 * 
 * 注意事项:
 * 1 4.0及其以上请注意开机广播监听的实现
 * 2 注意权限
 *   <uses-permission android:name="android.permission.KILL_BACKGROUND_PROCESSES" />
 *   <uses-permission android:name="android.permission.GET_TASKS"/>  
 *   
 * 备注说明:
 * 1 在杀死某进程时有时需要判断该进程所属的Activity是否正在屏幕上显示
 *   该方法请参见getTopActivityNameAndProcessName()
 * 2 若有其余的方法,请留言指教.多谢.
 * 
 */
public class MainActivity extends Activity {
	private Button mButton;
	private long lastTime = 0;
	private Context mContext;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);
		init();
	}

	private void init() {
		mContext = this;
		lastTime = System.currentTimeMillis();
		mButton = (Button) findViewById(R.id.button);
		mButton.setOnClickListener(new OnClickListener() {
			@Override
			public void onClick(View view) {
				if ((System.currentTimeMillis() - lastTime) > 2000) {
					lastTime = System.currentTimeMillis();
					cleanMemory(mContext);
				}

			}
		});
	}

	//模拟服务被系统回收
	private void cleanMemory(Context context) {
		RunningAppProcessInfo runningAppProcessInfo = null;
		ActivityManager activityManager =
		(ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);
		List<RunningAppProcessInfo> runningAppProcessInfoList = 
		activityManager.getRunningAppProcesses();
		if (runningAppProcessInfoList != null) {
			for (int i = 0; i < runningAppProcessInfoList.size(); ++i) {
				runningAppProcessInfo = runningAppProcessInfoList.get(i);
				String processName = runningAppProcessInfo.processName;
				if (processName.startsWith("cc.c")) {
					System.out.println("------>杀掉本应用");
					int pid = runningAppProcessInfo.pid;
					Process.killProcess(pid);
				}
			}
		}

	}
	
	//获取栈顶Activity及其所属进程
	public static String getTopActivityNameAndProcessName(Context context){
		String processName=null;
		String topActivityName=null;
		 ActivityManager activityManager =
		(ActivityManager)(context.getSystemService(android.content.Context.ACTIVITY_SERVICE )) ;
	     List<RunningTaskInfo> runningTaskInfos = activityManager.getRunningTasks(1) ;
	     if(runningTaskInfos != null){
	    	 ComponentName f=runningTaskInfos.get(0).topActivity;
	    	 String topActivityClassName=f.getClassName();
	    	 String temp[]=topActivityClassName.split("\\.");
	    	 //栈顶Activity的名称
	    	 topActivityName=temp[temp.length-1];
	    	 int index=topActivityClassName.lastIndexOf(".");
	    	//栈顶Activity所属进程的名称
	    	 processName=topActivityClassName.substring(0, index);
	    	 System.out.println("---->topActivityName="+topActivityName+",processName="+processName);
	    	 
	     }
	     return topActivityName+","+processName;
	}

}

BootCompletedBroadcastReceiver如下:

package cc.c;

import android.app.AlarmManager;
import android.app.PendingIntent;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.os.SystemClock;
//监听开机广播
public class BootCompletedBroadcastReceiver extends BroadcastReceiver {
	@Override
	public void onReceive(Context context, Intent intent) {
		//接收到开机广播
		if(intent.getAction().equals(Intent.ACTION_BOOT_COMPLETED)){
			sendCheckServiceBroadcast(context);
		}

	}
	
	//发送广播
	private void sendCheckServiceBroadcast(Context context) {
		Intent intent = new Intent(context, CheckServiceBroadcastReceiver.class);
		intent.setAction("com.cn.checkServicebroadcasreceiver");
		PendingIntent pendingIntent = PendingIntent.getBroadcast(context, 0, intent, 0);
		long firstime = SystemClock.elapsedRealtime();
		AlarmManager alarmManager = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
		//每间隔20秒发送广播startService
		alarmManager.setRepeating(AlarmManager.ELAPSED_REALTIME_WAKEUP, firstime,20 * 1000, pendingIntent);
	}
	
}

CheckServiceBroadcastReceiver如下:

package cc.c;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
//检查Service
public class CheckServiceBroadcastReceiver extends BroadcastReceiver {
	@Override
	public void onReceive(Context context, Intent intent) {
		if (intent.getAction().equals("com.cn.checkServicebroadcasreceiver")) {
			Intent serviceIntent = new Intent();
			serviceIntent.setAction("cn.com.servicesubclass");
			context.startService(serviceIntent);
		}

	}
}

ServiceSubclass如下:

package cc.c;

import android.app.Service;
import android.content.Intent;
import android.os.IBinder;
//执行业务逻辑的Service
public class ServiceSubclass extends Service {

	@Override
	public IBinder onBind(Intent arg0) {
		return null;
	}

	@Override
	public void onCreate() {
		super.onCreate();
		System.out.println("------>service onCreate()");
	}
	
	@Override
	public void onStart(Intent intent, int startId) {
		super.onStart(intent, startId);
		System.out.println("------>service onStart()");
	}
	

}

main.xml如下:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
   >

    <Button
        android:id="@+id/button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true"
        android:text="杀掉进程" />

</RelativeLayout>

AndroidManifest.xml如下:

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="cc.c"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="10"
        android:targetSdkVersion="10" />
    
    <!-- 杀死进程的权限 -->
    <uses-permission android:name="android.permission.KILL_BACKGROUND_PROCESSES" />
     <!-- 获取Task的权限 -->
    <uses-permission android:name="android.permission.GET_TASKS"/>  

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="cc.c.MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

        <!-- 注册开机广播接收者 -->
        <receiver android:name=".BootCompletedBroadcastReceiver" >
            <intent-filter>
                <action android:name="android.intent.action.BOOT_COMPLETED" />
            </intent-filter>
        </receiver>
        
         <!-- 注册广播接收者-->
        <receiver android:name=".CheckServiceBroadcastReceiver" >
            <intent-filter>
                <action android:name="com.cn.checkServicebroadcasreceiver" />
            </intent-filter>
        </receiver>
        
        <!-- 注册服务 -->
        <service android:name=".ServiceSubclass">
            <intent-filter>
                <action android:name="cn.com.servicesubclass"/>
            </intent-filter>
        </service>
        
        
    </application>

</manifest>

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Android实现防止被系统回收的Service

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