安卓學習筆記（九）、service的使用

1、

package com.example.servicedemo;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

public class MainActivity extends Activity implements OnClickListener {

	private Button btnstartservice, btnstopservice;
	private Intent serviceIntent;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		serviceIntent = new Intent(this, EchoService.class);
		btnstartservice = (Button) findViewById(R.id.btnstartservice);
		btnstopservice = (Button) findViewById(R.id.btnstopservice);
		btnstartservice.setOnClickListener(this);
		btnstopservice.setOnClickListener(this);

	}

	@Override
	public void onClick(View v) {
		// TODO Auto-generated method stub
		switch (v.getId()) {
		case R.id.btnstartservice:
			startService(serviceIntent);
			break;
		case R.id.btnstopservice:
			stopService(serviceIntent);
			break;

		}

	}
}

2、

package com.example.servicedemo;

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

public class EchoService extends Service {

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

	@Override
	public void onCreate() {
		System.out.println("onCreate");
		super.onCreate();
	}

	@Override
	public void onDestroy() {
		System.out.println("onDestroy");
		super.onDestroy();
	}

}

3、

將service添加到配置文件中

4、說明

service開啓後，儘管代碼中有寫startService(intent)，但是實際上是沒有activity的，看不到運行的。