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Better handling for display orientation
Externalize all tasks related to display orientation into DisplayOrientationDetector. Change-Id: I5d7c52f4912e1e5065505d4c9e73cce915c4408d
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library/src/main/java/com/google/android/cameraview/DisplayOrientationDetector.java
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,96 @@ | ||
| /* | ||
| * Copyright (C) 2016 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. | ||
| */ | ||
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| package com.google.android.cameraview; | ||
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| import android.content.Context; | ||
| import android.util.SparseIntArray; | ||
| import android.view.Display; | ||
| import android.view.OrientationEventListener; | ||
| import android.view.Surface; | ||
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| /** | ||
| * Monitors the value returned from {@link Display#getRotation()}. | ||
| */ | ||
| abstract class DisplayOrientationDetector { | ||
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| private final OrientationEventListener mOrientationEventListener; | ||
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| /** Mapping from Surface.Rotation_n to degrees. */ | ||
| private static final SparseIntArray DISPLAY_ORIENTATIONS = new SparseIntArray(); | ||
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| static { | ||
| DISPLAY_ORIENTATIONS.put(Surface.ROTATION_0, 0); | ||
| DISPLAY_ORIENTATIONS.put(Surface.ROTATION_90, 90); | ||
| DISPLAY_ORIENTATIONS.put(Surface.ROTATION_180, 180); | ||
| DISPLAY_ORIENTATIONS.put(Surface.ROTATION_270, 270); | ||
| } | ||
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| private Display mDisplay; | ||
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| private int mLastKnownDisplayOrientation = 0; | ||
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| public DisplayOrientationDetector(Context context) { | ||
| mOrientationEventListener = new OrientationEventListener(context) { | ||
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| /** This is either Surface.Rotation_0, _90, _180, _270, or -1 (invalid). */ | ||
| private int mLastKnownRotation = -1; | ||
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| @Override | ||
| public void onOrientationChanged(int orientation) { | ||
| if (orientation == OrientationEventListener.ORIENTATION_UNKNOWN || | ||
| mDisplay == null) { | ||
| return; | ||
| } | ||
| final int rotation = mDisplay.getRotation(); | ||
| if (mLastKnownRotation != rotation) { | ||
| mLastKnownRotation = rotation; | ||
| dispatchOnDisplayOrientationChanged(DISPLAY_ORIENTATIONS.get(rotation)); | ||
| } | ||
| } | ||
| }; | ||
| } | ||
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| public void enable(Display display) { | ||
| mDisplay = display; | ||
| mOrientationEventListener.enable(); | ||
| // Immediately dispatch the first callback | ||
| dispatchOnDisplayOrientationChanged(DISPLAY_ORIENTATIONS.get(display.getRotation())); | ||
| } | ||
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| public void disable() { | ||
| mOrientationEventListener.disable(); | ||
| mDisplay = null; | ||
| } | ||
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| public int getLastKnownDisplayOrientation() { | ||
| return mLastKnownDisplayOrientation; | ||
| } | ||
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| private void dispatchOnDisplayOrientationChanged(int displayOrientation) { | ||
| mLastKnownDisplayOrientation = displayOrientation; | ||
| onDisplayOrientationChanged(displayOrientation); | ||
| } | ||
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| /** | ||
| * Called when display orientation is changed. | ||
| * | ||
| * @param displayOrientation One of 0, 90, 180, and 270. | ||
| */ | ||
| public abstract void onDisplayOrientationChanged(int displayOrientation); | ||
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| } |