54 lines
2.1 KiB
Java
54 lines
2.1 KiB
Java
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/*
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* Copyright (C) 2022 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package android.window;
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import android.app.Activity;
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import android.app.Dialog;
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import android.view.View;
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import android.view.Window;
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/**
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* Callback allowing applications to handle back events in place of the system.
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* <p>
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* Callback instances can be added to and removed from {@link OnBackInvokedDispatcher}, which
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* is held at window level and accessible through {@link Activity#getOnBackInvokedDispatcher()},
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* {@link Dialog#getOnBackInvokedDispatcher()}, {@link Window#getOnBackInvokedDispatcher()}
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* and {@link View#findOnBackInvokedDispatcher()}.
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* <p>
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* When back is triggered, callbacks on the in-focus window are invoked in reverse order in which
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* they are added within the same priority. Between different priorities, callbacks with higher
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* priority are invoked first.
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* <p>
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* This replaces {@link Activity#onBackPressed()}, {@link Dialog#onBackPressed()} and
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* {@link android.view.KeyEvent#KEYCODE_BACK}
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* <p>
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* If you want to customize back animation behaviors, in addition to handling back invocations,
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* register its subclass instances {@link OnBackAnimationCallback} instead.
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* <p>
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* @see OnBackInvokedDispatcher#registerOnBackInvokedCallback(int, OnBackInvokedCallback)
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* registerOnBackInvokedCallback(priority, OnBackInvokedCallback)
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* to specify callback priority.
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*/
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@SuppressWarnings("deprecation")
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public interface OnBackInvokedCallback {
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/**
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* Called when a back gesture has been completed and committed, or back button pressed
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* has been released and committed.
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*/
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void onBackInvoked();
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}
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