fixed crashes NPE's below 12

2024-12-12 08:41:23 +08:00
parent 980fdda002
commit 4feac9547f
8 changed files with 865 additions and 27 deletions
@@ -0,0 +1,54 @@
+/*
+ * Copyright (C) 2022 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 android.window;
+
+import android.app.Activity;
+import android.app.Dialog;
+import android.view.View;
+import android.view.Window;
+
+/**
+ * Callback allowing applications to handle back events in place of the system.
+ *
+ * <p>Callback instances can be added to and removed from {@link OnBackInvokedDispatcher}, which is
+ * held at window level and accessible through {@link Activity#getOnBackInvokedDispatcher()}, {@link
+ * Dialog#getOnBackInvokedDispatcher()}, {@link Window#getOnBackInvokedDispatcher()} and {@link
+ * View#findOnBackInvokedDispatcher()}.
+ *
+ * <p>When back is triggered, callbacks on the in-focus window are invoked in reverse order in which
+ * they are added within the same priority. Between different priorities, callbacks with higher
+ * priority are invoked first.
+ *
+ * <p>This replaces {@link Activity#onBackPressed()}, {@link Dialog#onBackPressed()} and {@link
+ * android.view.KeyEvent#KEYCODE_BACK}
+ *
+ * <p>If you want to customize back animation behaviors, in addition to handling back invocations,
+ * register its subclass instances {@link OnBackAnimationCallback} instead.
+ *
+ * <p>
+ *
+ * @see OnBackInvokedDispatcher#registerOnBackInvokedCallback(int, OnBackInvokedCallback)
+ *     registerOnBackInvokedCallback(priority, OnBackInvokedCallback) to specify callback priority.
+ */
+@SuppressWarnings("deprecation")
+public interface OnBackInvokedCallback {
+    /**
+     * Called when a back gesture has been completed and committed, or back button pressed has been
+     * released and committed.
+     */
+    void onBackInvoked();
+}