标签：des android style blog http color io os 使用
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我们Binder的学习将从以下的一个实例開始。依据Android文档中的描写叙述，创建一个Binder服务主要包含例如以下3步：
以下详细看一下在eclipse中是怎样开发一个Binder应用的。
第一步：在project文件夹下定义aidl文件。
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package com.zxh.ipc;import com.zxh.ipc.PermissionInfo;interface ITestManager{ int checkPermission(String
permName, String pkgName); int checkUidPermission(String
permName, int uid); boolean addPermission(in
PermissionInfo info); void removePermission(String
name); boolean isProtectedBroadcast(String
actionName);} |
第二步：在定义aidl后，eclipse在project文件夹的gen文件夹下会自己主动生成相应的接口，以下是有aidl自己主动生成的Java代码：
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package com.zxh.ipc; public interface ITestManager extends android.os.IInterface{ /**
Local-side IPC implementation stub class. */ public static abstract class Stub extends android.os.Binder implements com.zxh.ipc.ITestManager { private static final java.lang.String
DESCRIPTOR = "com.zxh.ipc.ITestManager"; /**
Construct the stub at attach it to the interface. */ public Stub() { this.attachInterface(this,
DESCRIPTOR); } /** *
Cast an IBinder object into an com.zxh.ipc.ITestManager interface, generating a proxy if needed. */ public static com.zxh.ipc.ITestManager
asInterface(android.os.IBinder obj) { if ((obj
== null))
{ return null; } android.os.IInterface
iin = obj.queryLocalInterface(DESCRIPTOR); if (((iin
!= null)
&& (iin instanceof com.zxh.ipc.ITestManager)))
{ return ((com.zxh.ipc.ITestManager)
iin); } return new com.zxh.ipc.ITestManager.Stub.Proxy(obj); } @Override public android.os.IBinder
asBinder() { return this; } @Override public boolean onTransact(int code,
android.os.Parcel data, android.os.Parcel reply, int flags) throws android.os.RemoteException { switch (code) { case INTERFACE_TRANSACTION:
{ reply.writeString(DESCRIPTOR); return true; } case TRANSACTION_checkPermission:
{ data.enforceInterface(DESCRIPTOR); java.lang.String
_arg0; _arg0
= data.readString(); java.lang.String
_arg1; _arg1
= data.readString(); int _result
= this.checkPermission(_arg0,
_arg1); reply.writeNoException(); reply.writeInt(_result); return true; } case TRANSACTION_checkUidPermission:
{ data.enforceInterface(DESCRIPTOR); java.lang.String
_arg0; _arg0
= data.readString(); int _arg1; _arg1
= data.readInt(); int _result
= this.checkUidPermission(_arg0,
_arg1); reply.writeNoException(); reply.writeInt(_result); return true; } case TRANSACTION_addPermission:
{ data.enforceInterface(DESCRIPTOR); com.zxh.ipc.PermissionInfo
_arg0; if ((0 !=
data.readInt())) { _arg0
= com.zxh.ipc.PermissionInfo.CREATOR.createFromParcel(data); } else { _arg0
= null; } boolean _result
= this.addPermission(_arg0); reply.writeNoException(); reply.writeInt(((_result)
? (1)
: (0))); return true; } case TRANSACTION_removePermission:
{ data.enforceInterface(DESCRIPTOR); java.lang.String
_arg0; _arg0
= data.readString(); this.removePermission(_arg0); reply.writeNoException(); return true; } case TRANSACTION_isProtectedBroadcast:
{ data.enforceInterface(DESCRIPTOR); java.lang.String
_arg0; _arg0
= data.readString(); boolean _result
= this.isProtectedBroadcast(_arg0); reply.writeNoException(); reply.writeInt(((_result)
? (1)
: (0))); return true; } } return super.onTransact(code,
data, reply, flags); } private static class Proxy implements com.zxh.ipc.ITestManager { private android.os.IBinder
mRemote; Proxy(android.os.IBinder
remote) { mRemote
= remote; } @Override public android.os.IBinder
asBinder() { return mRemote; } public java.lang.String
getInterfaceDescriptor() { return DESCRIPTOR; } @Override public int checkPermission(java.lang.String
permName, java.lang.String pkgName) throws android.os.RemoteException { android.os.Parcel
_data = android.os.Parcel.obtain(); android.os.Parcel
_reply = android.os.Parcel.obtain(); int _result; try { _data.writeInterfaceToken(DESCRIPTOR); _data.writeString(permName); _data.writeString(pkgName); mRemote.transact(Stub.TRANSACTION_checkPermission,
_data, _reply, 0); _reply.readException(); _result
= _reply.readInt(); } finally { _reply.recycle(); _data.recycle(); } return _result; } @Override public int checkUidPermission(java.lang.String
permName, int uid) throws android.os.RemoteException { android.os.Parcel
_data = android.os.Parcel.obtain(); android.os.Parcel
_reply = android.os.Parcel.obtain(); int _result; try { _data.writeInterfaceToken(DESCRIPTOR); _data.writeString(permName); _data.writeInt(uid); mRemote.transact(Stub.TRANSACTION_checkUidPermission,
_data, _reply, 0); _reply.readException(); _result
= _reply.readInt(); } finally { _reply.recycle(); _data.recycle(); } return _result; } @Override public boolean addPermission(com.zxh.ipc.PermissionInfo
info) throws android.os.RemoteException { android.os.Parcel
_data = android.os.Parcel.obtain(); android.os.Parcel
_reply = android.os.Parcel.obtain(); boolean _result; try { _data.writeInterfaceToken(DESCRIPTOR); if ((info
!= null))
{ _data.writeInt(1); info.writeToParcel(_data, 0); } else { _data.writeInt(0); } mRemote.transact(Stub.TRANSACTION_addPermission,
_data, _reply, 0); _reply.readException(); _result
= (0 !=
_reply.readInt()); } finally { _reply.recycle(); _data.recycle(); } return _result; } @Override public void removePermission(java.lang.String
name) throws android.os.RemoteException { android.os.Parcel
_data = android.os.Parcel.obtain(); android.os.Parcel
_reply = android.os.Parcel.obtain(); try { _data.writeInterfaceToken(DESCRIPTOR); _data.writeString(name); mRemote.transact(Stub.TRANSACTION_removePermission,
_data, _reply, 0); _reply.readException(); } finally { _reply.recycle(); _data.recycle(); } } @Override public boolean isProtectedBroadcast(java.lang.String
actionName) throws android.os.RemoteException { android.os.Parcel
_data = android.os.Parcel.obtain(); android.os.Parcel
_reply = android.os.Parcel.obtain(); boolean _result; try { _data.writeInterfaceToken(DESCRIPTOR); _data.writeString(actionName); mRemote.transact(Stub.TRANSACTION_isProtectedBroadcast,
_data, _reply, 0); _reply.readException(); _result
= (0 !=
_reply.readInt()); } finally { _reply.recycle(); _data.recycle(); } return _result; } } static final int TRANSACTION_checkPermission
= (android.os.IBinder.FIRST_CALL_TRANSACTION + 0); static final int TRANSACTION_checkUidPermission
= (android.os.IBinder.FIRST_CALL_TRANSACTION + 1); static final int TRANSACTION_addPermission
= (android.os.IBinder.FIRST_CALL_TRANSACTION + 2); static final int TRANSACTION_removePermission
= (android.os.IBinder.FIRST_CALL_TRANSACTION + 3); static final int TRANSACTION_isProtectedBroadcast
= (android.os.IBinder.FIRST_CALL_TRANSACTION + 4); } public int checkPermission(java.lang.String
permName, java.lang.String pkgName) throws android.os.RemoteException; public int checkUidPermission(java.lang.String
permName, int uid) throws android.os.RemoteException; public boolean addPermission(com.zxh.ipc.PermissionInfo
info) throws android.os.RemoteException; public void removePermission(java.lang.String
name) throws android.os.RemoteException; public boolean isProtectedBroadcast(java.lang.String
actionName) throws android.os.RemoteException;} |
第三步：继承上一步生成的接口，实现自己的Service类：
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package com.zxh.server;import android.app.Service;import android.content.Intent;import android.content.ServiceConnection;import android.os.IBinder;import android.os.RemoteException;import android.util.Log;import com.zxh.ipc.ITestManager;import com.zxh.ipc.PermissionInfo;public class TestService extends Service{ private final static String
TAG = "zxh"; class TestManagerService extends ITestManager.Stub{ @Override public int checkPermission(String
permName, String pkgName) throws RemoteException
{ Log.i(TAG, "checkPermission
server"); return 0; } @Override public int checkUidPermission(String
permName, int uid) throws RemoteException
{ Log.i(TAG, "checkUidPermission
server"); return 0; } @Override public boolean addPermission(PermissionInfo
info) throws RemoteException
{ Log.i(TAG, "addPermission
server"); return false; } @Override public void removePermission(String
name) throws RemoteException
{ Log.i(TAG, "removePermission
server"); } @Override public boolean isProtectedBroadcast(String
actionName) throws RemoteException
{ Log.i(TAG, "isProtectedBroadcast
server"); return false; } } private TestManagerService
mService = new TestManagerService(); @Override public IBinder
onBind(Intent intent) { Log.i("zxh", "unbindService"); return mService; } @Override public void unbindService(ServiceConnection
conn) { super.unbindService(conn); Log.i("zxh", "unbindService"); }} |
第四步：实现client代码：
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package com.zxh.server;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.os.RemoteException;import android.util.Log;import android.view.View;import android.view.View.OnClickListener;import com.zxh.ipc.ITestManager;public class MainActivity extends Activity
{ private ITestManager
manager = null; ServiceConnection
connection = new ServiceConnection()
{ @Override public void onServiceDisconnected(ComponentName
name) { Log.i("binder", "onServiceDisconnected"); } @Override public void onServiceConnected(ComponentName
name, IBinder service) { manager
= ITestManager.Stub.asInterface(service); } }; @Override protected void onCreate(Bundle
savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); findViewById(R.id.startServer).setOnClickListener(new OnClickListener()
{ @Override public void onClick(View
v) { bindService(new Intent(MainActivity.this,
TestService.class),
connection, Service.BIND_AUTO_CREATE); } }); findViewById(R.id.stop).setOnClickListener(new OnClickListener()
{ @Override public void onClick(View
v) { unbindService(connection); } }); findViewById(R.id.check).setOnClickListener(new OnClickListener()
{ @Override public void onClick(View
v) { try { manager.checkPermission("permName", "pkgName"); } catch (RemoteException
e) { e.printStackTrace(); } } }); }} |
到这里我们就实现了一个完整的Binder实例，以下是project文件夹的截图：
完整代码能够查看后面的附件。以下来介绍一下这个实例中涉及到的一些知识点。
除了eclipse，也能够使用Android开发包中提供的aidl命令工具来生成，例如以下是adil命令：
关于adil的具体介绍能够查看Android官方文档，地址为：http://developer.android.com/intl/zh-cn/guide/components/aidl.html
想要了解aidl处理过程的朋友也能够自己查看aidl的源码，位于@/frameworks/base/tools/adil。
以下我们来分析一下aidl编译产生的ITestManager类。
从ITestManager中能够看出，ITestManager实现了IInterface接口。在ITestManager类中共包括了三部分内容，各自是：
我们在ITestManager.adil中定义的接口。
Stub类：主要由Server端实现，Server端通过继承本类，来提供详细的处理逻辑。
Proxy类：client代理，通过mRemote成员变量訪问远程Binder服务。
为了实现我们在ITestManager自定义接口的跨进程通信，Stub类和Proxy都实现了ITestManager接口。Stub自己继承了Binder类来实现Binder机制，Proxy则以引用的方式实现Binder机制。
client和服务端的通信主要通过onTransact方法实现，client和服务端的数据传递通过Parcel类完毕。这里须要注意一个问题：就是在client写入数据的顺序与在服务端读取数据的顺序必须是一致的。
尽管在上面的实现中，我们定义了一个Service类TestService，但这里要说明的是Service甚至adil都不是必须的，使用者全然能够自定义。
标签：des android style blog http color io os 使用
原文地址：http://www.cnblogs.com/hrhguanli/p/4002381.html
