1 files changed, 84 insertions, 0 deletions
diff --git a/src/com/android/launcher3/util/VibratorWrapper.java b/src/com/android/launcher3/util/VibratorWrapper.java
new file mode 100644
index 000000000..04741a165
--- /dev/null
+++ b/src/com/android/launcher3/util/VibratorWrapper.java
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+/*
+ * Copyright (C) 2019 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.launcher3.util;
+
+import static android.os.VibrationEffect.createPredefined;
+import static android.provider.Settings.System.HAPTIC_FEEDBACK_ENABLED;
+
+import static com.android.launcher3.util.Executors.MAIN_EXECUTOR;
+import static com.android.launcher3.util.Executors.UI_HELPER_EXECUTOR;
+
+import android.annotation.TargetApi;
+import android.content.ContentResolver;
+import android.content.Context;
+import android.database.ContentObserver;
+import android.os.Build;
+import android.os.VibrationEffect;
+import android.os.Vibrator;
+import android.provider.Settings;
+
+/**
+ * Wrapper around {@link Vibrator} to easily perform haptic feedback where necessary.
+ */
+@TargetApi(Build.VERSION_CODES.Q)
+public class VibratorWrapper {
+
+    public static final MainThreadInitializedObject<VibratorWrapper> INSTANCE =
+            new MainThreadInitializedObject<>(VibratorWrapper::new);
+
+    private static final VibrationEffect EFFECT_CLICK =
+            createPredefined(VibrationEffect.EFFECT_CLICK);
+
+    /**
+     * Haptic when entering overview.
+     */
+    public static final VibrationEffect OVERVIEW_HAPTIC = EFFECT_CLICK;
+
+    private final Vibrator mVibrator;
+    private final boolean mHasVibrator;
+
+    private boolean mIsHapticFeedbackEnabled;
+
+    public VibratorWrapper(Context context) {
+        mVibrator = context.getSystemService(Vibrator.class);
+        mHasVibrator = mVibrator.hasVibrator();
+        if (mHasVibrator) {
+            final ContentResolver resolver = context.getContentResolver();
+            mIsHapticFeedbackEnabled = isHapticFeedbackEnabled(resolver);
+            final ContentObserver observer = new ContentObserver(MAIN_EXECUTOR.getHandler()) {
+                @Override
+                public void onChange(boolean selfChange) {
+                    mIsHapticFeedbackEnabled = isHapticFeedbackEnabled(resolver);
+                }
+            };
+            resolver.registerContentObserver(Settings.System.getUriFor(HAPTIC_FEEDBACK_ENABLED),
+                    false /* notifyForDescendents */, observer);
+        } else {
+            mIsHapticFeedbackEnabled = false;
+        }
+    }
+
+    private boolean isHapticFeedbackEnabled(ContentResolver resolver) {
+        return Settings.System.getInt(resolver, HAPTIC_FEEDBACK_ENABLED, 0) == 1;
+    }
+
+    /** Vibrates with the given effect if haptic feedback is available and enabled. */
+    public void vibrate(VibrationEffect vibrationEffect) {
+        if (mHasVibrator && mIsHapticFeedbackEnabled) {
+            UI_HELPER_EXECUTOR.execute(() -> mVibrator.vibrate(vibrationEffect));
+        }
+    }
+}