获取有关 PendingIntent 的 Intent 的详细信息

Question

我想知道是否有可能从我自己没有创建的 PendingIntent 中获取更多信息。更准确地说：是否有可能以某种方式检索PendingIntent 的原始Intent？我不需要执行它，但想打印它的内容。

查看PendingIntent的代码，它显示了一个隐藏的方法：

/** @hide */
public IIntentSender getTarget() {
    return mTarget;
}

但是这个IIntentSender 也被隐藏了，并且与Binder 和更多IPC（我猜）相关的东西有关。没那么容易。有什么想法吗？

Answer 1

此方法适用于 Android 4.2.2 及更高版本：

/**
 * Return the Intent for PendingIntent.
 * Return null in case of some (impossible) errors: see Android source.
 * @throws IllegalStateException in case of something goes wrong.
 * See {@link Throwable#getCause()} for more details.
 */
public Intent getIntent(PendingIntent pendingIntent) throws IllegalStateException {
    try {
        Method getIntent = PendingIntent.class.getDeclaredMethod("getIntent");
        return (Intent) getIntent.invoke(pendingIntent);
    } catch (NoSuchMethodException | InvocationTargetException | IllegalAccessException e) {
        throw new IllegalStateException(e);
    }
}

---

以下是 Android 2.3 及更高版本的不完整实现。它需要额外编写一段原生 (JNI) 代码。那么也许它会起作用。更多详情见TODO评论。

/**
 * Return the Intent for PendingIntent.
 * Return null in case of some (impossible) errors: see Android source.
 * @throws IllegalStateException in case of something goes wrong.
 * See {@link Throwable#getCause()} and {@link Throwable#getMessage()} for more details.
 */
public Intent getIntent(PendingIntent pendingIntent) throws IllegalStateException {
    try {
        Method getIntent = PendingIntent.class.getDeclaredMethod("getIntent");
        return (Intent) getIntent.invoke(pendingIntent);
    } catch (NoSuchMethodException e) {
        return getIntentDeep(pendingIntent);
    } catch (InvocationTargetException | IllegalAccessException e) {
        throw new IllegalStateException(e);
    }
}

private Intent getIntentDeep(PendingIntent pendingIntent) throws IllegalStateException {
    try {
        Class<?> activityManagerNativeClass = Class.forName("android.app.ActivityManagerNative");
        Method getDefault = activityManagerNativeClass.getDeclaredMethod("getDefault");
        Object defaultManager = getDefault.invoke(null);
        if (defaultManager == null) {
            throw new IllegalStateException("ActivityManagerNative.getDefault() returned null");
        }
        Field mTargetField = PendingIntent.class.getDeclaredField("mTarget");
        mTargetField.setAccessible(true);
        Object mTarget = mTargetField.get(pendingIntent);
        if (mTarget == null) {
            throw new IllegalStateException("PendingIntent.mTarget field is null");
        }
        String defaultManagerClassName = defaultManager.getClass().getName();
        switch (defaultManagerClassName) {
        case "android.app.ActivityManagerProxy":
            try {
                return getIntentFromProxy(defaultManager, mTarget);
            } catch (RemoteException e) {
                // Note from PendingIntent.getIntent(): Should never happen.
                return null;
            }
        case "com.android.server.am.ActivityManagerService":
            return getIntentFromService(mTarget);
        default:
            throw new IllegalStateException("Unsupported IActivityManager inheritor: " + defaultManagerClassName);
        }
    } catch (ClassNotFoundException | NoSuchMethodException | IllegalAccessException | InvocationTargetException | NoSuchFieldException e) {
        throw new IllegalStateException(e);
    }
}

private Intent getIntentFromProxy(Object defaultManager, Object sender) throws RemoteException {
    Class<?> activityManagerProxyClass;
    IBinder mRemote;
    int GET_INTENT_FOR_INTENT_SENDER_TRANSACTION = IBinder.FIRST_CALL_TRANSACTION + 160;
    String iActivityManagerDescriptor = "android.app.IActivityManager";
    try {
        activityManagerProxyClass = Class.forName("android.app.ActivityManagerProxy");
        Field mRemoteField = activityManagerProxyClass.getDeclaredField("mRemote");
        mRemoteField.setAccessible(true);
        mRemote = (IBinder) mRemoteField.get(defaultManager);
    } catch (ClassNotFoundException | NoSuchFieldException | IllegalAccessException e) {
        throw new IllegalStateException(e);
    }

    // From ActivityManagerProxy.getIntentForIntentSender()
    Parcel data = Parcel.obtain();
    Parcel reply = Parcel.obtain();
    data.writeInterfaceToken(iActivityManagerDescriptor);
    data.writeStrongBinder(((IInterface) sender).asBinder());
    transact(mRemote, data, reply, 0);
    reply.readException();
    Intent res = reply.readInt() != 0
            ? Intent.CREATOR.createFromParcel(reply) : null;
    data.recycle();
    reply.recycle();
    return res;
}

private boolean transact(IBinder remote, Parcel data, Parcel reply, int i) {
    // TODO: Here must be some native call to convert ((BinderProxy) remote).mObject int
    // to IBinder* native pointer and do some more magic with it.
    // See android_util_Binder.cpp: android_os_BinderProxy_transact() in the Android sources.
}

private Intent getIntentFromService(Object sender) {
    String pendingIntentRecordClassName = "com.android.server.am.PendingIntentRecord";
    if (!(sender.getClass().getName().equals(pendingIntentRecordClassName))) {
        return null;
    }
    try {
        Class<?> pendingIntentRecordClass = Class.forName(pendingIntentRecordClassName);
        Field keyField = pendingIntentRecordClass.getDeclaredField("key");
        Object key = keyField.get(sender);
        Class<?> keyClass = Class.forName("com.android.server.am.PendingIntentRecord$Key");
        Field requestIntentField = keyClass.getDeclaredField("requestIntent");
        requestIntentField.setAccessible(true);
        Intent requestIntent = (Intent) requestIntentField.get(key);
        return requestIntent != null ? new Intent(requestIntent) : null;
    } catch (ClassCastException e) {
    } catch (ClassNotFoundException | NoSuchFieldException | IllegalAccessException e) {
        throw new IllegalStateException(e);
    }
    return null;
}

Answer 2

如果您希望 Intent 用于 Robolectric 中的测试目的，请使用 ShadowPendingIntent：

public static Intent getIntent(PendingIntent pendingIntent) {
    return ((ShadowPendingIntent) ShadowExtractor.extract(pendingIntent))
        .getSavedIntent();
}

Answer 3

您可以使用IntentSender，它可以从PendingIntent.getIntentSender() 获得。 IntentSender的函数getCreatorPackage()，将给出创建这个PendingIntent的包。