ResultManager.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.car.app.managers;
import android.content.ComponentName;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.content.pm.ServiceInfo;
import androidx.annotation.MainThread;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.annotation.RestrictTo;
import androidx.car.app.CarAppMetadataHolderService;
import androidx.car.app.CarContext;
/**
* Manages 'for result' app workflow.
*
* <p>This is used internally by the library and its functionality is exposed through
* {@link androidx.car.app.CarContext}
*
* @hide
*/
@MainThread
@RestrictTo(RestrictTo.Scope.LIBRARY)
public interface ResultManager extends Manager {
/**
* Sets the result of this car app.
*
* @see CarContext#setCarAppResult(int, Intent) for more details
*/
void setCarAppResult(int resultCode, @Nullable Intent data);
/**
* Return the component (service or activity) that invoked this car app.
*
* <p>This is who the data in {@link #setCarAppResult(int, Intent)} will be sent to.
*
* @see CarContext#getCallingComponent() for more details
*/
@Nullable
ComponentName getCallingComponent();
/**
* Returns a platform-dependant instance of {@link ResultManager}.
*
* @throws IllegalStateException if none of the supported classes are found or if a supported
* class was found but the constructor was mismatched
* @hide
*/
@RestrictTo(RestrictTo.Scope.LIBRARY_GROUP)
@NonNull
static ResultManager create(@NonNull CarContext context) throws IllegalStateException {
try {
ServiceInfo serviceInfo = CarAppMetadataHolderService.getServiceInfo(context);
String managerClassName = null;
if (serviceInfo.metaData != null) {
managerClassName = serviceInfo.metaData.getString(
"androidx.car.app.CarAppMetadataHolderService.RESULT_MANAGER");
}
if (managerClassName == null) {
throw new ClassNotFoundException("ResultManager metadata could not be found");
}
Class<?> managerClass = Class.forName(managerClassName);
return (ResultManager) managerClass.getConstructor().newInstance();
} catch (PackageManager.NameNotFoundException | ReflectiveOperationException e) {
throw new IllegalStateException("ResultManager not configured. Did you forget "
+ "to add a dependency on the app-automotive artifact?");
}
}
}