02_启动和销毁Service

在Application关闭后，Service仍然会运行。

package com.example.servdemo;

import android.app.Activity;
import android.app.ActionBar;
import android.app.Fragment;
import android.content.Intent;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.Button;
import android.os.Build;

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 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;
    }

    @Override
    public void onClick(View v) {

        switch (v.getId()) {
        case R.id.btnStartService:
            startService(serviceIntent);
            break;

        case R.id.btnStopService:
            stopService(serviceIntent);
            break;
        }
    }

}

package com.example.servdemo;

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() {
        // TODO Auto-generated method stub
        System.out.println("Service Start!");
        super.onCreate();
    }

    @Override
    public void onDestroy() {
        // TODO Auto-generated method stub
        System.out.println("Service Stop!");
        super.onDestroy();
    }

}