让后台服务不被杀———电话录音

来源：互联网发布：图标上下不停跳动js 编辑：程序博客网时间：2024/06/13 21:24

最近做了一个监听电话并录音的小例子，而保证它在后台运行不被杀确实不容易。

首先在主service中：

service中重写onStartCommand方法，这个方法有三个返回值， START_STICKY是service被kill掉后自动

public int onStartCommand(Intent intent, int flags, int startId) {        IntentFilter filter=new IntentFilter();        filter.addAction(Intent.ACTION_TIME_TICK);        UserPresentReceive userReceive = new UserPresentReceive();        registerReceiver(userReceive,filter);                int flag = START_STICKY;        // 判断是否是Broadcast发来的intentif (!("Protect".equals(intent.getAction()))) {            System.out.println("action" + intent.getAction());            this.outGoingNum = intent.getStringExtra("outGoingNums");            // 将耗时操作放到子线程中            backGroundExecution();        }        return super.onStartCommand(intent, flag, startId);    }

在onDestroy()方法中，启动当前服务，同时再启动protectService（）

public void onDestroy() {        System.out.println("ServicePhone_onDestroy");        Intent ins = new Intent(this, ServicePhone.class);        ins.setAction("Protect");        startService(ins);
        Intent in = new Intent(this, ProtectService.class);        startService(in);        super.onDestroy();    }

新建一个ProtectService服务，同时再建一个broadcastReceive

public int onStartCommand(Intent intent, int flags, int startId) {                Intent ins = new Intent(this, ServicePhone.class);        ins.setAction("Protect");        startService(ins);        flags = START_STICKY;        return super.onStartCommand(intent, flags, startId);    }    public void onDestroy() {        Intent in = new Intent(this, ServicePhone.class);        in.setAction("Protect");        startService(in);
//相互关联        Intent ins = new Intent(this, ProtectService.class);        startService(ins);        super.onDestroy();    }

ProtectService中用alarmManager来不断触发UserPresentReceive

private void proctectServiceInBack() {        /**         * 指定时间间隔 重复唤醒alarm         */        AlarmManager alarmManager = (AlarmManager)getSystemService(Context.ALARM_SERVICE);        // 在合适的时间醒来        int alarmType = AlarmManager.RTC_WAKEUP;        // 设置时间长度        long timeOrLengthofWait = 150;        long timeOrLengthofWaits=20000;        Intent intent = new Intent(getApplicationContext(),                UserPresentReceive.class);        intent.setAction("protect");        PendingIntent alarmIntent = PendingIntent.getBroadcast(this, 0,                intent, 0);        alarmManager.setRepeating(alarmType, timeOrLengthofWait,                timeOrLengthofWaits, alarmIntent);    }

在UserPresentReceive 监听系统广播：

Intent.ACTION_TIME_TICK，这个广播每分钟发送一次，我们可以每分钟检查一次Service的运行状态，如果已经被结束了，就重新启动Service。
同时监听 ACTION_BOOT_COMPLETED

    public void onReceive(Context content, Intent intent) {        System.out.println("UserPresentReceive");        if(Intent.ACTION_TIME_TICK.equals(intent.getAction()) ){            Intent in=new Intent(content, ProtectService.class);            content.startService(in);        }else if(Intent.ACTION_BUG_REPORT.equals(intent.getAction())){            Intent in=new Intent(content, ProtectService.class);            content.startService(in);        }else{            Intent in=new Intent(content, ProtectService.class);            content.startService(in);        }        //开机自启        if(Intent.ACTION_BOOT_COMPLETED.equals(intent.getAction())){            Intent in=new Intent(content,ServicePhone.class);            in.setAction("Protect");            content.startService(in);        } else{            Intent in=new Intent(content, ServicePhone.class);            in.setAction("Protect");            content.startService(in);        }    }}

另外建再建一个broadcastReceive来监听电话状态

if (Intent.ACTION_NEW_OUTGOING_CALL.equals(intent.getAction())) {            //取得号码            String outGoingNum = intent                    .getStringExtra(Intent.EXTRA_PHONE_NUMBER);            Intent in=new Intent(content,ServicePhone.class);            in.setAction(".b2");            //将号码传给service            in.putExtra("outGoingNums", outGoingNum);            content.startService(in);        } else{            Intent in=new Intent(content, ServicePhone.class);            in.setAction(".b3");            content.startService(in);        }    }

manifest.xml application中可以加 android:persistent="true" 提高不被杀死的几率

<application        android:allowBackup="true"        android:icon="@drawable/ic_launcher"        android:label="@string/app_name"        android:persistent="true"        android:theme="@style/AppTheme" >

将protectService另起一个进程

<service            android:process=":protect"            android:name="com.example.phonelisten.ProtectService"            android:enabled="true" >        </service>

监听系统广播设置android:priority 提高优先权

<receiver android:name="com.example.phonelisten.ReceivePhone" >           <intent-filter android:priority="1000" >               <action android:name="android.intent.action.TIME_TICK" />                <action android:name="android.intent.action.PHONE_STATE" />                <action android:name="android.intent.action.BOOT_COMPLETED" />                <action android:name="android.intent.action.NEW_OUTGOING_CALL" />            </intent-filter>        </receiver>        <receiver android:name="com.example.phonelisten.UserPresentReceive" >            <intent-filter android:priority="999" >                <action android:name="android.intent.action.BOOT_COMPLETED" />                <action android:name="android.intent.action.TIME_TICK" />                <action android:name="android.intent.action.BUG_REPORT" />                 <action android:name="android.intent.action.USER_PRESENT" />                 <action android:name="android.media.RINGER_MODE_CHANGED" />            </intent-filter>        </receiver>

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