Binder通信過程類似于TCP/IP服務連接過程binder四大架構Server(服務器)，Client(客戶端)，ServiceManager(DNS)以及Binder驅動(路由器)

其中Server，Client，ServiceManager運行于用戶空間，驅動運行于內核空間。這四個角色的關系和互聯網類似：Server是服務器，Client是客戶終端，SMgr是域名服務器（DNS），驅動是路由器。

book.java

package com.example.android_binder_testservice;import android.os.Parcel;import android.os.Parcelable;public class Book implements Parcelable { private String bookName; private String author; private int publishDate; public Book() { } public Book(String bookName, String author, int publishDate) { super(); this.bookName = bookName; this.author = author; this.publishDate = publishDate; } public String getBookName() { return bookName; } public void setBookName(String bookName) { this.bookName = bookName; } public String getAuthor() { return author; } public void setAuthor(String author) { this.author = author; } public int getPublishDate() { return publishDate; } public void setPublishDate(int publishDate) { this.publishDate = publishDate; } @Override public int describeContents() { return 0; } @Override public void writeToParcel(Parcel out, int flags) { out.writeString(bookName); out.writeString(author); out.writeInt(publishDate); }public static final Parcelable.Creator<Book> CREATOR = new Creator<Book>() { @Override public Book[] newArray(int size) { return new Book[size]; } @Override public Book createFromParcel(android.os.Parcel source) { return new Book(source); } }; public Book(Parcel in) { bookName = in.readString(); author = in.readString(); publishDate = in.readInt(); }}

上面是一個 實現了parcelable的實體類，就是將book序列化，在putExtra到Service時會被寫入內存加快程序速度

mainActivity.java

package com.example.android_binder_testservice;import android.os.Bundle;import android.util.Log;import android.app.Activity;import android.content.Intent;import android.view.Menu;import android.view.View;import android.widget.Button;public class MainActivity extends Activity { Button startServiceButton;// 啟動服務按鈕 Button shutDownServiceButton;// 關閉服務按鈕 Button startBindServiceButton;// 啟動綁定服務按鈕 @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); getWidget(); regiestListener(); } public void getWidget(){ startServiceButton = (Button) findViewById(R.id.startService); startBindServiceButton = (Button) findViewById(R.id.bindService); shutDownServiceButton = (Button) findViewById(R.id.stopService); } public void regiestListener() { startServiceButton.setOnClickListener(startService); shutDownServiceButton.setOnClickListener(shutdownService); startBindServiceButton.setOnClickListener(startBinderService); } /** 啟動服務的事件監聽 */ public Button.OnClickListener startService = new Button.OnClickListener() { public void onClick(View view) { /** 單擊按鈕時啟動服務 */ Intent intent = new Intent(MainActivity.this, CountService.class); startService(intent); Log.v('MainStadyServics', 'start Service'); } }; /** 關閉服務 */ public Button.OnClickListener shutdownService = new Button.OnClickListener() { public void onClick(View view) { /** 單擊按鈕時啟動服務 */ Intent intent = new Intent(MainActivity.this, CountService.class); /** 退出Activity是，停止服務 */ stopService(intent); Log.v('MainStadyServics', 'shutDown serveice'); } }; /** 打開綁定服務的Activity */ public Button.OnClickListener startBinderService = new Button.OnClickListener() { public void onClick(View view) { /** 單擊按鈕時啟動服務 */ Intent intent = new Intent(MainActivity.this, UseBrider.class); startActivity(intent); Log.v('MainStadyServics', 'start Binder Service'); } };}

mainActivity中當使用startService()啟動Service時會調用Service的onStartCommand（）

當使用bindService（）則會調用onBind（）方法，可能會覺了看的又看怎么沒看到bindService（）這個方法呢

重點在

Intent intent = new Intent(MainActivity.this, UseBrider.class);startActivity(intent);

繼續上代碼

UseBrider.java

/** 通過bindService和unBindSerivce的方式啟動和結束服務 */public class UseBrider extends FragmentActivity { /** 參數設置 */ CountService countService; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(new UseBriderFace(this)); Intent intent = new Intent(UseBrider.this, CountService.class); intent.putExtra('book', new Book('name', 'an', 1999));/** 進入Activity開始服務　* conn　*/ bindService(intent, conn, Context.BIND_AUTO_CREATE); } private ServiceConnection conn = new ServiceConnection() { /* * 這個方法會獲取到CountService的onBind方法中返回的Binder對象 * 然后就可以對服務進行某種操作了 */ public void onServiceConnected(ComponentName name, IBinder service) { // TODO Auto-generated method stub countService = ((CountService.ServiceBinder) service).getService(); countService.callBack(); } /** 無法獲取到服務對象時的操作 */ public void onServiceDisconnected(ComponentName name) { // TODO Auto-generated method stub countService = null; } }; protected void onDestroy() { super.onDestroy(); this.unbindService(conn); Log.v('MainStadyServics', 'out'); }}

UseBriderFace.java

public class UseBriderFace extends View{ /**創建參數*/ public UseBriderFace(Context context){ super(context); } public void onDraw(Canvas canvas){ canvas.drawColor(Color.WHITE);//畫白色背景/**繪制文字*/ Paint textPaint = new Paint(); textPaint.setColor(Color.RED); textPaint.setTextSize(30); canvas.drawText('使用綁定服務', 10, 30, textPaint); textPaint.setColor(Color.GREEN); textPaint.setTextSize(18); canvas.drawText('使用綁定服務后，這個Activity關閉后', 20, 60, textPaint); canvas.drawText('綁定的服務也會關閉', 5, 80, textPaint); } }

UseBriderFace.java類其實就是用java定義的布局可以用xml文件代替

countService.java

package com.example.android_binder_testservice;/**引入包*/import android.app.Service;// 服務的類import android.os.IBinder;import android.os.Parcel;import android.os.RemoteException;import android.os.Binder;import android.content.Intent;import android.util.Log;/** 計數的服務 */public class CountService extends Service { private String TAG = CountService.class.getSimpleName(); /** 創建參數 */ boolean threadDisable; int count; Book book;/* * 當通過bindService()啟動CountService時會調用這個方法并返回一個ServiceBinder對象 * 這個Binder對象封裝著一個CountService實例， * 客戶端就可以通過ServiceBinder對服務端進行一些操作 */ public IBinder onBind(Intent intent) { Log.i(TAG, 'onBind'); book = intent.getParcelableExtra('book'); return new ServiceBinder(); } @Override public int onStartCommand(Intent intent, int flags, int startId) { Log.i(TAG, 'onStartCommand'); return super.onStartCommand(intent, flags, startId); } @Override public boolean onUnbind(Intent intent) { Log.i(TAG, 'onUnbind'); return super.onUnbind(intent); } @Override public void onRebind(Intent intent) { Log.i(TAG, 'onRebind'); super.onRebind(intent); } public void onCreate() { super.onCreate(); /** 創建一個線程，每秒計數器加一，并在控制臺進行Log輸出 */ new Thread(new Runnable() { public void run() {while (!threadDisable) { try { Thread.sleep(1000); } catch (InterruptedException e) { } count++; Log.v('CountService', 'Count is' + count);} } }).start(); Log.i(TAG, 'onCreate'); } public void onDestroy() { super.onDestroy(); /** 服務停止時，終止計數進程 */ this.threadDisable = true; Log.i(TAG, 'onDestroy'); } public int getConunt() { return count; } public void callBack(){ Log.i(TAG, 'hello,i am a method of CountService'); } class ServiceBinder extends Binder { public CountService getService() { return CountService.this; } }}

代碼解釋有了，想不出來了

源碼下載地址：http://git.oschina.net/zwh_9527/Binder

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