android调用当地服务示例

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);}

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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 {		@Override		public String getHelloResult(String name) {			// TODO Auto-generated method stub			return name+":Hello World";		}    }    }

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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() {		@Override		public void onServiceConnected(ComponentName name, IBinder service) {			Log.i("INFO", "Service bound");			serviceInstance = (IService) service;		}		@Override		public void onServiceDisconnected(ComponentName arg0) {			Log.i("INFO", "Service Unbound");		}	};	/** Called when the activity is first created. */	@Override	public 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() {			@Override			public void onClick(View v) {				Editable str;				str = mEditText.getText();				String result = serviceInstance.getHelloResult(str.toString());				textView.setText(result);			}		});	}}

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