android 服务与多线程

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android服务是运行在UI主线程的。一下是代码demo:

package com.example.testservice;import android.os.Bundle;import android.app.Activity;import android.content.Intent;import android.view.Menu;public class MainActivity extends Activity {    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        startService(new Intent(MainActivity.this,ServiceTest.class));    }    @Override    public boolean onCreateOptionsMenu(Menu menu) {        // Inflate the menu; this adds items to the action bar if it is present.        getMenuInflater().inflate(R.menu.main, menu);        return true;    }    }

package com.example.testservice;import android.app.Service;import android.content.Intent;import android.os.Handler;import android.os.IBinder;import android.os.Looper;import android.os.Message;import android.util.Log;import android.widget.Toast;public class ServiceTest extends Service {private Handler mHandler=new Handler(){@Overridepublic void handleMessage(Message msg) {switch (msg.what) {case 1:new Thread(){@Overridepublic void run() {Log.i("服务", "第2个线程");Looper.prepare();for(int i=10;i<20;i++){Toast.makeText(getApplicationContext(), i+"",0).show();try {//Thread.sleep(1000);} catch (Exception e) {// TODO: handle exception}}mHandler.sendEmptyMessage(2);Looper.loop();};}.start();break;case 2:new Thread(){@Overridepublic void run() {Log.i("服务", "第3个线程");Looper.prepare();for(int i=20;i<30;i++){Toast.makeText(getApplicationContext(), i+"",0).show();try {//Thread.sleep(1000);} catch (Exception e) {// TODO: handle exception}}mHandler.sendEmptyMessage(3);Looper.loop();};}.start();break;case 3: onDestroy();break;default:break;}super.handleMessage(msg);}};public ServiceTest() {// TODO Auto-generated constructor stub}@Overridepublic IBinder onBind(Intent intent) {// TODO Auto-generated method stubreturn null;}@Overridepublic void onCreate() {Log.i("服务", "onCreate()");super.onCreate();new Thread(){@Overridepublic void run() {Log.i("服务", "第一个线程");Looper.prepare();for(int i=0;i<10;i++){Toast.makeText(getApplicationContext(), i+"",0).show();try {//Thread.sleep(1000);} catch (Exception e) {// TODO: handle exception}}mHandler.sendEmptyMessage(1);Looper.loop();};}.start();}@Overridepublic int onStartCommand(Intent intent, int flags, int startId) {Log.i("服务", "onStartCommand");return super.onStartCommand(intent, flags, startId);}@Overridepublic void onDestroy() {Log.i("服务", "onDestroy()");super.onDestroy();stopSelf();}}

demo下载地址：http://download.csdn.net/detail/u014600432/8104521

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