ActivityResultContract.java
/*
* Copyright 2020 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.activity.result.contract;
import android.annotation.SuppressLint;
import android.app.Activity;
import android.content.Intent;
import androidx.activity.result.ActivityResultCaller;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
/**
* A contract specifying that an activity can be called with an input of type I
* and produce an output of type O
*
* Makes calling an activity for result type-safe.
*
* @param <I> input type
* @param <O> output type
*
* @see ActivityResultCaller
*/
public abstract class ActivityResultContract<I, O> {
/** Create an intent that can be used for {@link Activity#startActivityForResult} */
public abstract @NonNull Intent createIntent(@SuppressLint("UnknownNullness") I input);
/** Convert result obtained from {@link Activity#onActivityResult} to O */
public abstract @SuppressLint("UnknownNullness") O parseResult(
int resultCode,
@Nullable Intent intent);
}