绑定本地Service并与之通信

绑定Service需要调用

public boolean bindService (Intent service, ServiceConnection conn, int flags)；

传入一个ServiceConnection 对象，该对象是一个接口，实例化时需要实现该接口，它的作用就是获得Service的IBinder对象，通过IBinder对象可以实现与Service的通信。

Service的的代码：

package com.example.servicetest;

import android.app.Service;
import android.content.Intent;
import android.os.Binder;
import android.os.IBinder;
import android.util.Log;

public class BindServiceTest extends Service {
    private int count = 0;
    private boolean quit = false;
    private MyBinder mBinder = new MyBinder();

    public class MyBinder extends Binder {
        public int count() {
            return count;
        }
    }

    @Override
    public IBinder onBind(Intent arg0) {
        Log.i("csx", "onBind");
        return mBinder;
    }

    @Override
    public void onCreate() {

        super.onCreate();
        Log.i("csx", "onCreate");
        new Thread() {

            @Override
            public void run() {
                while (!quit) {
                    try {
                        Thread.sleep(1000);
                    } catch (InterruptedException e) {

                        e.printStackTrace();
                    }
                    count++;

                }

            }

        }.start();
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        Log.i("csx", "onStartCommand");
        return START_STICKY;
    }

    @Override
    public boolean onUnbind(Intent intent) {
        Log.i("csx", "onUnbind");
        return true;
    }

    @Override
    public void onDestroy() {
        super.onDestroy();
        this.quit = true;
        Log.i("csx", "onDestroy");
    }

}

组件的代码：

package com.example.servicetest;

import com.example.servicetest.BindServiceTest.MyBinder;

import android.content.ComponentName;
import android.content.Intent;
import android.content.ServiceConnection;
import android.os.Bundle;
import android.os.IBinder;
import android.support.v7.app.ActionBarActivity;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;

public class MainActivity extends ActionBarActivity {
    public static final String SERVICE_ACTION = "com.example.servicetest.BindServiceTest";
    Button bindButton, unbindButton, stateButton;
    ServiceConnection conn;
    BindServiceTest.MyBinder mBinder;
    boolean isBind = false;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        bindButton = (Button) findViewById(R.id.button_bind);
        unbindButton = (Button) findViewById(R.id.button_unbind);
        stateButton = (Button) findViewById(R.id.button_get_state);

        conn = new ServiceConnection() {

            @Override
            public void onServiceConnected(ComponentName name, IBinder service) {
                Log.i("csx", "onServiceConnected");
                mBinder = (MyBinder) service; // 连接service之后将service中实现的Binder返回给本地声明的Binder

            }

            @Override
            public void onServiceDisconnected(ComponentName name) {
                Log.i("csx", "onServiceDisconnected");// 意外断开连接会调用该函数

            }

        };

        bindButton.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                Intent service = new Intent();
                service.setAction(SERVICE_ACTION);
                bindService(service, conn, BIND_AUTO_CREATE);// 绑定服务
                isBind = true;

            }
        });

        unbindButton.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                if (!isBind) {
                    Toast.makeText(MainActivity.this, "请先绑定服务", Toast.LENGTH_SHORT).show();
                    return;

                }

                unbindService(conn);// 解除绑定服务
                isBind = false;

            }
        });

        stateButton.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                if (!isBind) {
                    Toast.makeText(MainActivity.this, "请先绑定服务", Toast.LENGTH_SHORT).show();
                    return;

                }
                Toast.makeText(MainActivity.this, "" + mBinder.count(), Toast.LENGTH_SHORT).show();// 通过mBinder获取service内部的数据

            }
        });

    }
}