我们须要用下面方式来启动service:
</pre><pre name="code" class="java"><span style="white-space:pre"> </span>Intent intent = new Intent();
intent.setClass(MainActivity.this, MyService.class);
<strong>bindService(intent,conn,BIND_AUTO_CREATE);</strong>
ServiceConnection conn = new ServiceConnection() {
@Override
public void onServiceDisconnected(ComponentName name) {
}
@Override
public void onServiceConnected(ComponentName name, IBinder service) {
mService = ((MyService.MyBinder)service).getService();
}
};
这时service会运行:onCreate和onBind
然后
我们去运行一些任务:
ImageView item_image = (ImageView)findViewById(R.id.item_image);
item_image.setOnClickListener(new View.OnClickListener() { @Override
public void onClick(View v) {
<strong>mService.setHandler(mHandler);
mService.startCheckIfUpgrade();</strong>
}
}); private Handler mHandler = new Handler() {
@Override
public void handleMessage(Message msg) {
switch (msg.what) {
case GET_UPGRADE_INFORMATION_COMPLETE:
System.out.println("=======notify need upgrade");
AlertDialog dialog = getCustomDialog();
dialog.show();
default:
break;
}
}
};
Service的代码是:
public class MyService extends Service {
/** thread to execute background task*/
private Thread mThread = null;
/** flag indicates if the service has been stopped*/
private boolean mStopFlag = false;
private static final int GET_UPGRADE_INFORMATION_COMPLETE = 202;
/** Handler to get notify from thread*/
private Handler mHandler = null;
public void setHandler(Handler handler) {
this.mHandler = handler;
}
@Override
public boolean onUnbind(Intent intent) {
System.out.println("====service onUnbind");
return super.onUnbind(intent);
}
public class MyBinder extends Binder {
/**
* 获取当前Service的实例
*
* @return
*/
public MyService getService() {
return MyService.this;
}
}
public void startCheckIfUpgrade() {
if(mThread == null){
mThread = new UpgradeThread();
mThread.start();
}
}
@Override
public IBinder onBind(Intent arg0) {
System.out.println("====service onBind");
return new MyBinder();
}
/**
* @see android.app.Service#onCreate()
*/
@Override
public void onCreate() {
super.onCreate();
System.out.println("====service onCreate");
}
private class UpgradeThread extends Thread{
/**
* @see java.lang.Thread#run()
*/
@Override
public void run() {
super.run();
//在这里写去服务端查看是否须要升级的逻辑
try {
Thread.sleep(3000);
} catch (InterruptedException e) {
e.printStackTrace();
}
boolean ret = true;
if(ret && !mStopFlag){
Message msg = new Message();
msg.what = GET_UPGRADE_INFORMATION_COMPLETE;
mHandler.sendMessage(msg);
}
}
}
/* (non-Javadoc)
* @see android.app.Service#onDestroy()
*/
@Override
public void onDestroy() {
System.out.println("====ondestroy");
mStopFlag = true;
try {
if (null != mThread && mThread.isAlive()) {
try
{
mThread.stop();
}
catch (Exception e)
{
}
}
mThread = null;
}
catch (Exception e) {
e.printStackTrace();
}
super.onDestroy();
System.gc();
}
}
当activity销毁后Service会运行:
onUnbind和onDestroy
这个说明这个service的生命周期和activity是一致的