Android 反射困惑

Question

我正在尝试反射(reflect)一个 Android 类，我们知道它可以完成，因为其他应用程序正在这样做，但我们自己却难以实现结果。

我们卡在下面了

Class<?> myClass = Class.forName("android.content.pm.PackageManager");
Method method = myClass.getMethod("deleteApplicationCacheFiles", String.class,IPackageDataObserver.class);

IPackageDataObserver.class 不存在

import android.content.pm.IPackageDataObserver;

也不起作用，我可以手动从 Google 获取接口(interface)代码并将它们放入包中，但这似乎有点 OTT，想知道我是否遗漏了什么。

谢谢

Answer 1

编辑:

将 IPackageDataObserver 类添加到您自己的项目中，这是执行此操作的唯一方法。

在你的源文件夹中创建一个包，命名为“android.content.pm”并添加这个类，这个类只是原始的android源代码:

/*
 * This file is auto-generated.  DO NOT MODIFY.
 * Original file: frameworks/base/core/java/android/content/pm/IPackageDataObserver.aidl
 */
package android.content.pm;
/**
 * API for package data change related callbacks from the Package Manager.
 * Some usage scenarios include deletion of cache directory, generate
 * statistics related to code, data, cache usage(TODO)
 * {@hide}
 */
public interface IPackageDataObserver extends android.os.IInterface
{
/** Local-side IPC implementation stub class. */
public static abstract class Stub extends android.os.Binder implements android.content.pm.IPackageDataObserver
{
private static final java.lang.String DESCRIPTOR = "android.content.pm.IPackageDataObserver";
/** Construct the stub at attach it to the interface. */
public Stub()
{
this.attachInterface(this, DESCRIPTOR);
}
/**
 * Cast an IBinder object into an android.content.pm.IPackageDataObserver interface,
 * generating a proxy if needed.
 */
public static android.content.pm.IPackageDataObserver asInterface(android.os.IBinder obj)
{
if ((obj==null)) {
return null;
}
android.os.IInterface iin = (android.os.IInterface)obj.queryLocalInterface(DESCRIPTOR);
if (((iin!=null)&&(iin instanceof android.content.pm.IPackageDataObserver))) {
return ((android.content.pm.IPackageDataObserver)iin);
}
return new android.content.pm.IPackageDataObserver.Stub.Proxy(obj);
}
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_onRemoveCompleted:
{
data.enforceInterface(DESCRIPTOR);
java.lang.String _arg0;
_arg0 = data.readString();
boolean _arg1;
_arg1 = (0!=data.readInt());
this.onRemoveCompleted(_arg0, _arg1);
return true;
}
}
return super.onTransact(code, data, reply, flags);
}
private static class Proxy implements android.content.pm.IPackageDataObserver
{
private android.os.IBinder mRemote;
Proxy(android.os.IBinder remote)
{
mRemote = remote;
}
public android.os.IBinder asBinder()
{
return mRemote;
}
public java.lang.String getInterfaceDescriptor()
{
return DESCRIPTOR;
}
public void onRemoveCompleted(java.lang.String packageName, boolean succeeded) throws android.os.RemoteException
{
android.os.Parcel _data = android.os.Parcel.obtain();
try {
_data.writeInterfaceToken(DESCRIPTOR);
_data.writeString(packageName);
_data.writeInt(((succeeded)?(1):(0)));
mRemote.transact(Stub.TRANSACTION_onRemoveCompleted, _data, null, android.os.IBinder.FLAG_ONEWAY);
}
finally {
_data.recycle();
}
}
}
static final int TRANSACTION_onRemoveCompleted = (android.os.IBinder.FIRST_CALL_TRANSACTION + 0);
}
public void onRemoveCompleted(java.lang.String packageName, boolean succeeded) throws android.os.RemoteException;
}

罗尔夫