android调用本地服务示例

在大多数情况下android只需要调用本地的服务(也就是和调用者在同一个进程的服务)就可以,调用服务必须采用的绑定的方式建立和服务的连接,并且得到服务的实例,然后才能调用。下面的例子演示了在Activity调用本地服务,在Activity界面上输入人名,点击确定在按钮的下面显示调用服务的结果:人名":Hello World",步骤如下:

1.创建服务接口,

服务接口提供了服务能提供的供调用者调用的方法。

IService.java

package com.local.service;public interface IService {public String getHelloResult(String name);}

2.服务的实现者

HelloService.java

package com.local.service;import android.app.Service;import android.content.Intent;import android.os.Binder;import android.os.IBinder;public class HelloService extends Service {    private MyServiceBinder myServiceBinder = new MyServiceBinder();    @Override    public IBinder onBind(Intent intent) {        return myServiceBinder;    }    public class MyServiceBinder extends Binder implements IService {@Overridepublic String getHelloResult(String name) {// TODO Auto-generated method stubreturn name+":Hello World";}    }    }

3.调用服务的Activity

LocalServiceCallDemo.java

package com.local.service;import android.app.Activity;import android.content.ComponentName;import android.content.Context;import android.content.Intent;import android.content.ServiceConnection;import android.os.Bundle;import android.os.IBinder;import android.text.Editable;import android.util.Log;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.EditText;import android.widget.TextView;public class LocalServiceCallDemo extends Activity {private EditText mEditText;private IService serviceInstance;private TextView textView;ServiceConnection conn = new ServiceConnection() {@Overridepublic void onServiceConnected(ComponentName name, IBinder service) {Log.i("INFO", "Service bound");serviceInstance = (IService) service;}@Overridepublic void onServiceDisconnected(ComponentName arg0) {Log.i("INFO", "Service Unbound");}};/** Called when the activity is first created. */@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.main);Button mButton = (Button) findViewById(R.id.myButton);mEditText = (EditText) findViewById(R.id.myEditText);textView = (TextView) findViewById(R.id.myTextView01);bindService(new Intent("com.local.service.MY_SERVICE"), conn,Context.BIND_AUTO_CREATE);mButton.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {Editable str;str = mEditText.getText();String result = serviceInstance.getHelloResult(str.toString());textView.setText(result);}});}}

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