Android 进阶——Android 跨进程通讯机制之 Binder，okhttp 读取信息 kotlin

• Construct the stub at attach it to the interface.*/

• public Stub() {

• this.attachInterface(this, DESCRIPTOR);

• }

/**

• Cast an IBinder object into an com.handsome.boke.IMyAidlInterface interface,

• generating a proxy if needed.*/

• public static com.handsome.boke.IMyAidlInterface asInterface(android.os.IBinder obj) {

• if ((obj == null)) {

• return null;

• }

• android.os.IInterface iin = obj.queryLocalInterface(DESCRIPTOR);

• if (((iin != null) && (iin instanceof com.handsome.boke.IMyAidlInterface))) {

• return ((com.handsome.boke.IMyAidlInterface) iin);

• }

• return new com.handsome.boke.IMyAidlInterface.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_basicTypes: {

data.enforceInterface(DESCRIPTOR);

int _arg0;

_arg0 = data.readInt();

long _arg1;

_arg1 = data.readLong();

boolean _arg2;

_arg2 = (0 != data.readInt());

float _arg3;

_arg3 = data.readFloat();

double _arg4;

_arg4 = data.readDouble();

java.lang.String _arg5;

_arg5 = data.readString();

this.basicTypes(_arg0, _arg1, _arg2, _arg3, _arg4, _arg5);

reply.writeNoException();

return true;

}

case TRANSACTION_add: {

data.enforceInterface(DESCRIPTOR);

int _arg0;

_arg0 = data.readInt();

int _arg1;

_arg1 = data.readInt();

int _result = this.add(_arg0, _arg1);

reply.writeNoException();

reply.writeInt(_result);

return true;

}

}

return super.onTransact(code, data, reply, flags);

}

private static class Proxy implements com.handsome.boke.IMyAidlInterface {

private android.os.IBinder mRemote;

Proxy(android.os.IBinder remot

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e) {

mRemote = remote;

}

@Override

public android.os.IBinder asBinder() {

return mRemote;

}

public java.lang.String getInterfaceDescriptor() {

return DESCRIPTOR;

}

/**

• Demonstrates some basic types that you can use as parameters

• and return values in AIDL.*/

• @Override

• public void basicTypes(int anInt, long aLong, boolean aBoolean, float aFloat, double aDouble, java.lang.String aString) 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.writeInt(anInt);

• _data.writeLong(aLong);

• _data.writeInt(((aBoolean) ? (1) : (0)));

• _data.writeFloat(aFloat);

• _data.writeDouble(aDouble);

• _data.writeString(aString);

• mRemote.transact(Stub.TRANSACTION_basicTypes, _data, _reply, 0);

• _reply.readException();

• } finally {

• _reply.recycle();

• _data.recycle();

• }

• }

@Override

public int add(int num1, int num2) 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.writeInt(num1);

_data.writeInt(num2);

mRemote.transact(Stub.TRANSACTION_add, _data, _reply, 0);

_reply.readException();

_result = _reply.readInt();

} finally {

_reply.recycle();

_data.recycle();

}

return _result;

}

}

static final int TRANSACTION_basicTypes = (android.os.IBinder.FIRST_CALL_TRANSACTION + 0);

static final int TRANSACTION_add = (android.os.IBinder.FIRST_CALL_TRANSACTION + 1);

}

/**

• Demonstrates some basic types that you can use as parameters

• and return values in AIDL.*/

• public void basicTypes(int anInt, long aLong, boolean aBoolean, float aFloat, double aDouble, java.lang.String aString) throws android.os.RemoteException;

public int add(int num1, int num2) throws android.os.RemoteException;

}

1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162636465666768697071727374757677787980818283848586878889909192939495969798991001011021031041051061071081091101111121131141151161171181191201211221231241251261271281291301311321331341351361371381391401411421431441451461471481491501511521532、asInterface

当客户端 bindService 的 onServiceConnecttion 的回调里面，通过 asInterface 方法获取远程的 service 的。其函数的参数 IBinder 类型的 obj，这个对象是驱动给我们的，如果是 Binder 本地对象，那么它就是 Binder 类型，如果是 Binder 代理对象，那就是 BinderProxy 类型。asInterface 方法中会调用 queryLocalInterface，查找 Binder 本地对象，如果找到，说明 Client 和 Server 都在同一个进程，这个参数直接就是本地对象，直接强制类型转换然后返回，如果找不到，说明是远程对象那么就需要创建 Binder 代理对象，让这个 Binder 代理对象实现对于远程对象的访问

/**

• Cast an IBinder object into an com.handsome.boke.IMyAidlInterface interface,

• generating a proxy if needed.*/

• public static com.handsome.boke.IMyAidlInterface asInterface(android.os.IBinder obj) {

• if ((obj == null)) {

• return null;

• }

• android.os.IInterface iin = obj.queryLocalInterface(DESCRIPTOR);

• if (((iin != null) && (iin instanceof com.handsome.boke.IMyAidlInterface))) {

• return ((com.handsome.boke.IMyAidlInterface) iin);

• }

• return new com.handsome.boke.IMyAidlInterface.Stub.Proxy(obj);

• }12345678910111213143、add

当客户端调用 add 方法时，首先用 Parcel 把数据序列化，然后调用 mRemote.transact 方法，mRemote 就是 new Stub.Proxy(obj)传进来的，即 BinderProxy 对象

@Override

public int add(int num1, int num2) 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.writeInt(num1);

_data.writeInt(num2);

mRemote.transact(Stub.TRANSACTION_add, _data, _reply, 0);

_reply.readException();

_result = _reply.readInt();

} finally {

_reply.recycle();

_data.recycle();

}

return _result;

}

1234567891011121314151617184、transact

BinderProxy 的 transact 方法是 native 方法，它的实现在 native 层，它会去借助 Binder 驱动完成数据的传输，当完成数据传输后，会唤醒 Server 端，调用了 Server 端本地对象的 onTransact 函数

public native boolean transact(int code, Parcel data, Parcel reply,int flags) throws RemoteException;125、onTransact