android不死服务的实现方法

大部分应用在手机长按home键删除最近程序时，进程会被杀掉，本文将实现一个不死的service，
首先，看入口程序：
MainActivity

package where.com.notkillservicedemo;

import android.app.Activity;
import android.content.ComponentName;
import android.content.pm.PackageManager;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;


public class MainActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        PackageManager packageManager = this.getPackageManager();
        ComponentName componentName = new ComponentName(this, MainActivity.class);
        //隐藏APP桌面图标并且不会在最近使用程序中找到
        packageManager.setComponentEnabledSetting(componentName, PackageManager.COMPONENT_ENABLED_STATE_DISABLED,
                PackageManager.DONT_KILL_APP);
    }


    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();

        //noinspection SimplifiableIfStatement
        if (id == R.id.action_settings) {
            return true;
        }

        return super.onOptionsItemSelected(item);
    }
}

其中最重要的是packageManager.setComponentEnabledSetting(componentName, PackageManager.COMPONENT_ENABLED_STATE_DISABLED,
                PackageManager.DONT_KILL_APP);
执行此代码后，应用在桌面的图标会被隐藏，且长按手机home键不会查看到该程序，所以也就无法杀死进程。当然，从设置里面还是可以强制杀死的，任何应用都不例外。
相反，  packageManager.setComponentEnabledSetting(componentName, PackageManager.COMPONENT_ENABLED_STATE_DEFAULT,
                    PackageManager.DONT_KILL_APP);
就是显示应用桌面图标并且可以长按手机home键中找到该程序，从而可以将APP进程杀死。

当然我们还要有一个服务来为我们做事，
MainService

package where.com.notkillservicedemo;

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

import java.util.Timer;
import java.util.TimerTask;

public class MainService extends Service {
    public final static String TAG = "MainService";

    private  Timer timer = new Timer();
    private  class MyTask extends TimerTask {
        @Override
        public void run() {
          Log.e(TAG,"1111");
        }
    }
    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        Log.e(TAG,"onStartCommand");
        timer.schedule(new MyTask(),0,2000);
        return START_NOT_STICKY;
    }

    @Override
    public void onDestroy() {
        super.onDestroy();
        Log.e(TAG,"onDestroy");
    }

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

除此之外要想保证服务一直存在，可以在用户最常按的电源键上做文章，因此我们需要一个广播接收器
BootBroadcastReceiver

package where.com.notkillservicedemo;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.util.Log;
/**
 * 开机自启，按键启动
 */
public class BootBroadcastReceiver extends BroadcastReceiver {
    public static final String TAG = BootBroadcastReceiver.class.getSimpleName();
    @Override
    public void onReceive(Context context, Intent intent) {
        Log.e(TAG, "BootBroadcastReceiver onReceive");
        if (intent.getAction().equals(Intent.ACTION_BOOT_COMPLETED) || intent.getAction().equals(Intent.ACTION_SCREEN_ON) ||
                intent.getAction().equals(Intent.ACTION_SCREEN_OFF) || intent.getAction().equals(Intent.ACTION_USER_PRESENT) || android.media.AudioManager.ACTION_AUDIO_BECOMING_NOISY.equals(intent.getAction())) {
            Log.e(TAG, "action=" + intent.getAction());
            Intent ootStartIntent = new Intent(context, MainService.class);
            context.startService(ootStartIntent);
        }
    }

}

AndroidManifest.xml

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

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name=".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>
        <service android:name=".MainService"/>
        <receiver android:name=".BootBroadcastReceiver">
            <intent-filter>
                <action android:name="android.intent.action.BOOT_COMPLETED" />
                <action android:name="android.media.AUDIO_BECOMING_NOISY" />
                <action android:name="android.intent.action.SCREEN_ON" />
                <action android:name="android.intent.action.SCREEN_OFF" />
                <action android:name="android.intent.action.USER_PRESENT" />
            </intent-filter>
        </receiver>
    </application>

</manifest>