UserHandleCompat.java
/*
* Copyright 2021 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package androidx.core.os;
import android.os.Build;
import android.os.UserHandle;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.annotation.RequiresApi;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
/**
* Helper for accessing features in {@link android.os.UserHandle} in a backwards compatible
* fashion.
*/
@RequiresApi(17)
public class UserHandleCompat {
@Nullable
private static Method sGetUserIdMethod;
@Nullable
private static Constructor<UserHandle> sUserHandleConstructor;
private UserHandleCompat() {
}
/**
* Returns the user handle for a given uid.
*/
@NonNull
public static UserHandle getUserHandleForUid(int uid) {
if (Build.VERSION.SDK_INT >= 24) {
return Api24Impl.getUserHandleForUid(uid);
} else {
try {
Integer userId = (Integer) getGetUserIdMethod().invoke(null, uid);
return getUserHandleConstructor().newInstance(userId);
} catch (NoSuchMethodException e) {
Error error = new NoSuchMethodError();
error.initCause(e);
throw error;
} catch (IllegalAccessException e) {
Error error = new IllegalAccessError();
error.initCause(e);
throw error;
} catch (InstantiationException e) {
Error error = new InstantiationError();
error.initCause(e);
throw error;
} catch (InvocationTargetException e) {
throw new RuntimeException(e);
}
}
}
@RequiresApi(24)
private static class Api24Impl {
private Api24Impl() {
}
@NonNull
static UserHandle getUserHandleForUid(int uid) {
return UserHandle.getUserHandleForUid(uid);
}
}
private static Method getGetUserIdMethod() throws NoSuchMethodException {
if (sGetUserIdMethod == null) {
sGetUserIdMethod = UserHandle.class.getDeclaredMethod("getUserId", int.class);
sGetUserIdMethod.setAccessible(true);
}
return sGetUserIdMethod;
}
private static Constructor<UserHandle> getUserHandleConstructor() throws NoSuchMethodException {
if (sUserHandleConstructor == null) {
sUserHandleConstructor = UserHandle.class.getDeclaredConstructor(int.class);
sUserHandleConstructor.setAccessible(true);
}
return sUserHandleConstructor;
}
}