android 的service和activity是运行在UI主线程的。在android线程中，只要主线程即UI线程有自己的默许的音讯行列。子线程需求创立自己的音讯行列，并把音讯发给行列，并循环起来，发给handler处理。
1、Looper.prepare();给子线程创立音讯行列。
2、Looper.loop();把音讯放入音讯行列并循环起来。
如下是一个经过activity的oncreate()办法发动服务，在服务里开启子线程，并发音讯给主线程来处理的DEMO。
3、MainActivity.java如下：
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
startService(new Intent(MainActivity.this,ServiceTest.class));
}
4、ServiceTest.java
public class ServiceTest extends Service {
private Handler mHandler=new Handler(){
@Override
public void handleMessage(Message msg) {
switch (msg.what) {
case 1:
new Thread(){
@Override
public void run() {
Log.i(服务, 第2个线程);
Looper.prepare();
for(int i=10;i20;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(){
@Override
public void run() {
Log.i(服务, 第3个线程);
Looper.prepare();
for(int i=20;i30;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
}
@Override
public IBinder onBind(Intent intent) {
// TODO Auto-generated method stub
return null;
}
@Override
public void onCreate() {
Log.i(服务, onCreate());
super.onCreate();
new Thread(){
@Override
public void run() {
Log.i(服务, 第一个线程);
Looper.prepare();
for(int i=0;i10;i++){
Toast.makeText(getApplicationContext(), i+,0).show();
try {
//Thread.sleep(1000);
} catch (Exception e) {
// TODO: handle exception
}
}
mHandler.sendEmptyMessage(1);
Looper.loop();
};
}.start();
}
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
Log.i(服务, onStartCommand);
return super.onStartCommand(intent, flags, startId);
}
@Override
public void onDestroy() {
Log.i(服务, onDestroy());
super.onDestroy();
stopSelf();
}
}
