bindService與startService區別

1. Started Service中使用startService（）方法來進行方法的調用，調用者和服務之間沒有聯系，即使調用者退出了，服務依然在進行 【onCreate()-  >onStartCommand()->startService()->onDestroy()】，注意其中沒有 onStart()，主要是被onStartCommand()方法給取代了，onStart方法不推薦使用了。
2. BindService中使用bindService()方法來綁定服務，調用者和綁定者綁在一起，調用者一旦退出服務也就終止了【onCreate()->onBind()->onUnbind()->onDestroy()】。

 

example:service與activity間通信

MainActivity

package com.stone.test2;

import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.content.ServiceConnection;
import android.os.IBinder;
import android.os.Message;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.EditText;
import android.widget.TextView;

import java.util.logging.Handler;
import java.util.logging.LogRecord;


public class MainActivity extends ActionBarActivity implements View.OnClickListener, ServiceConnection {

    private EditText edittext;
    private TextView textview;
    private MyService.MyBinder myBinder;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        edittext= (EditText) findViewById(R.id.edittext);
        textview= (TextView) findViewById(R.id.textview);
        System.out.println("onCreate");
        findViewById(R.id.btnStart).setOnClickListener(this);
        findViewById(R.id.btnStop).setOnClickListener(this);
        findViewById(R.id.btnBindService).setOnClickListener(this);
        findViewById(R.id.btnUnbindService).setOnClickListener(this);
        findViewById(R.id.btnSyn).setOnClickListener(this);

    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        textview.setText(data.getStringExtra("data"));
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_main, menu);
        return true;

    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();

        //noinspection SimplifiableIfStatement
        if (id == R.id.action_settings) {
            return true;
        }

        return super.onOptionsItemSelected(item);
    }

    @Override
    public void onClick(View v) {
        switch (v.getId()) {
            case R.id.btnStart:
//                System.out.println("who are you");
                Intent intent = new Intent(this,MyService.class);   //starService通過intent把數據傳給MyService
                intent.putExtra("data",edittext.getText().toString());
                startService(intent);
                break;
            case R.id.btnStop:                                 //stopService
                stopService(new Intent(this, MyService.class));
                break;
            case R.id.btnBindService:                       //binService，通過實現ServiceConnection，將數據傳給MyService
                bindService(new Intent(this,MyService.class),this, Context.BIND_AUTO_CREATE);
                break;
            case R.id.btnUnbindService:
                unbindService(this);
                break;
            case R.id.btnSyn:                      //同步數據，將數據傳給MyService
                if (myBinder!=null){
                    myBinder.setData(edittext.getText().toString());
                }
                break;
        }
    }

    @Override
    public void onServiceConnected(ComponentName name, IBinder service) {
        myBinder = (MyService.MyBinder) service;  //同步數據，將數據傳給MyService
        myBinder.getService().setCallback(new MyService.callBack() {   //獲取MyService傳來的數據
            @Override
            public void onDataChange(String data) {  //因為在MyService中是在另一個線程中調用onDataChange，所以通過handler將數據傳送給UI線程
                Message msg = new Message();
                Bundle bundle = new Bundle();
                bundle.putString("data",data);
                msg.setData(bundle);
                handler.sendMessage(msg);
            }
        });
    }

    @Override
    public void onServiceDisconnected(ComponentName name) {

    }

    private android.os.Handler handler = new android.os.Handler(){  //通過Handler獲取工作線程傳來的數據，並顯示在TextView中
        @Override
        public void handleMessage(Message msg) {
            super.handleMessage(msg);
            textview.setText(msg.getData().getString("data"));
        }
    };
}

MyService

package com.stone.test2;

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

public class MyService extends Service {
    private String data;
    private boolean running;

    public MyService() {
    }

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

    public class MyBinder extends Binder{

        public void setData(String data){ //bindservice方式獲取Activity傳送來的數據
            MyService.this.data=data;
        }

        public MyService getService(){  //返回MyService
            return MyService.this;
        }
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        data = intent.getStringExtra("data");  //startService方式獲取Activity傳送來的數據
        return super.onStartCommand(intent, flags, startId);
    }

    @Override
    public void onCreate() {
        super.onCreate();
        running = true;
        new Thread(){
            @Override
            public void run() {
                super.run();
                int i = 0;
                //   System.out.println("fucking");
                while (running) {
                    i++;
                    String str=i+":" + data;
                    if (callback!=null) {
                        callback.onDataChange(str);
                    }
                    System.out.println(str);
                    try {
                        sleep(1000);
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                }
            }
        }.start();

    }

    @Override
    public void onDestroy() {
        super.onDestroy();
        running = false;
    }

    private callBack callback = null;

    public void setCallback(callBack callback){
        this.callback = callback;
    }

    public callBack getCallback(){
        return callback;
    }

    public static interface callBack{  //bindService通過回調函數將數據傳送給Activity
        void onDataChange(String data);
    }
}