Fix the crash when applying daily wallpaper without network connection
It's because CustomizationPickerActivity is cast to BaseActivity to call isSafeToCommitFragmentTransaction(), but it is not a BaseActivity.
Extract isSafeToCommitFragmentTransaction() to an interface to let CustomizationPickerActivity to implement it.
Bug: 167943713
Change-Id: I497620f86f5309392761ce11e19bc183a70178cb
diff --git a/src/com/android/wallpaper/picker/FragmentTransactionChecker.java b/src/com/android/wallpaper/picker/FragmentTransactionChecker.java
new file mode 100644
index 0000000..c25a41f
--- /dev/null
+++ b/src/com/android/wallpaper/picker/FragmentTransactionChecker.java
@@ -0,0 +1,29 @@
+/*
+ * Copyright (C) 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 com.android.wallpaper.picker;
+
+/**
+ * An interface for a class to keep track of whether fragment transactions are safe to commit given
+ * the activity's current lifecycle state.
+ */
+public interface FragmentTransactionChecker {
+ /**
+ * Checks if the fragment transactions are safe to commit
+ *
+ * @return {@code true} if it is safe; {@code false} otherwise.
+ */
+ boolean isSafeToCommitFragmentTransaction();
+}