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Serivce中onRebind被調(diào)用的時(shí)機(jī)很特別，想知道什么時(shí)候onRebind被調(diào)用，可以接下面的次序來(lái)學(xué)習(xí)，后自然就明白了!

1. 首先要知道，同一個(gè)服務(wù)既可能被啟動(dòng)也可以被綁定;

2. Service中onRebind方法被調(diào)用，只要符合兩個(gè)必要條件就行

<1>服務(wù)中onUnBind方法返回值為true<2>服務(wù)對(duì)象被解綁后沒(méi)有被銷毀，之后再次被綁定。下面舉例說(shuō)明：

例1：同一個(gè)Activity對(duì)象

先自啟動(dòng)服務(wù)(onCreate, onStartCommand);再綁定服務(wù)(onBind); 再解除綁定服務(wù)(onUnBind)(由于服務(wù)被啟動(dòng)過(guò)，所以Service中onDestroy不會(huì)被調(diào)用);再綁定服務(wù), 這次綁定的服務(wù)對(duì)象是之前已經(jīng)創(chuàng)建好的，所以這次綁定服務(wù)時(shí)就會(huì)調(diào)用onReBind方法了，并且本次不會(huì)調(diào)用onBind方法。

例2：不是同一個(gè)Activity對(duì)象

打開(kāi)項(xiàng)目，啟動(dòng)MainActivity， 在Activity中啟動(dòng)服務(wù)(onCreate, onStartCommand),再綁定服務(wù)(onBind); 再解除綁定服務(wù)(onUnBind); 再接返回鍵銷毀MainActivity對(duì)象(onUnBind);再打開(kāi)項(xiàng)目啟動(dòng)MainActivity;再綁定服務(wù)，這次綁定服務(wù)時(shí)會(huì)調(diào)用onReBind方法

代碼示例：

//activity_main.xml文件

<LinearLayout xmlns:android="//schemas.android.com/apk/res/android"

xmlns:tools="//schemas.android.com/tools"

android:id="@+id/container"

android:layout_width="match_parent"

android:layout_height="match_parent"

android:orientation="vertical"

tools:context="com.qf.act.MainActivity"

tools:ignore="MergeRootFrame,Orientation" >

<TextView

android:id="@+id/textView1"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="TextView1" />

<Button

android:id="@+id/bind"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:onClick="work"

android:text="bind" />

<Button

android:id="@+id/unbind"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:onClick="work"

android:text="unbind" />

<Button

android:id="@+id/call"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:onClick="work"

android:text="call" />

</LinearLayout>

布局文件運(yùn)行的界面

//LocalService.java文件

package com.qf.act;

import android.app.Service;

import android.content.Intent;

import android.os.Binder;

import android.os.IBinder;

import android.util.Log;

public class LocalService extends Service {

private static String LOG = "LocalService";

private int count = 0;

private IBinder binder = new MyIbinder();

@Override

public IBinder onBind(Intent intent) {

Log.e(LOG, "onBind");

return this.binder;

}

@Override

public boolean onUnbind(Intent intent) {

Log.e(LOG, "onUnBind");

return true;

}

@Override

public void onRebind(Intent intent) {

super.onRebind(intent);

Log.e(LOG, "onRebind");

}

@Override

public void onCreate() {

new Thread() {

public void run() {

Log.e(LOG, "onCreate");

for (int i = 0; i < 100; i++) {

count++;

try {

Thread.sleep(1000);

} catch (InterruptedException e) {

e.printStackTrace();

}

}

}

}.start();

super.onCreate();

}

public class MyIbinder extends Binder {

public int getCount() {

return LocalService.this.getCount();

}

}

public int getCount() {

return this.count;

}

@Override

public void onDestroy() {

Log.e(LOG, "onDestroy");

super.onDestroy();

}

}

MainActivity.java文件

package com.qf.act;

import com.qf.act.LocalService.MyIbinder;

import android.app.Activity;

import android.app.Service;

import android.content.ComponentName;

import android.content.Intent;

import android.content.ServiceConnection;

import android.os.Bundle;

import android.os.IBinder;

import android.util.Log;

import android.view.View;

import android.widget.Toast;

public class MainActivity extends Activity {

private boolean isBind = false;

private LocalService.MyIbinder binder = null;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

}

public void work(View v) {

Intent intent = new Intent();

intent.setClass(this, LocalService.class);

switch (v.getId()) {

case R.id.start:

this.startService(intent);

break;

case R.id.stop:

this.stopService(intent);

break;

case R.id.bind:

this.bindService(intent, conn, Service.BIND_AUTO_CREATE);

break;

case R.id.unbind:

if(isBind == true)

{

unbindService(conn);

isBind = false;

}

break;

case R.id.call:

if(this.binder == null)

return;

int count = this.binder.getCount();

Toast.makeText(this, ""+count, 1).show();

break;

}

}

private ServiceConnection conn = new ServiceConnection() {

@Override

public void onServiceDisconnected(ComponentName name) {

Log.e("", "onServiceDisconnected");

}

@Override

public void onServiceConnected(ComponentName name, IBinder service) {

binder = (MyIbinder) service;

isBind = true;

}

};

}

操作示例：

1.點(diǎn)擊按鈕 啟動(dòng)服務(wù)

日志信息: onCreate

2. 點(diǎn)擊按鈕 bind

日志信息: onBind

3.點(diǎn)擊按鈕 unbind

日志信息: onUnBind

4.點(diǎn)擊按鈕 bind

日志信息: onReBind