| /* |
| * Copyright (C) 2013 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.camera.app; |
| |
| import android.app.Activity; |
| import android.content.ContentResolver; |
| import android.content.Context; |
| import android.content.pm.ActivityInfo; |
| import android.content.res.Configuration; |
| import android.os.Handler; |
| import android.provider.Settings; |
| import android.view.OrientationEventListener; |
| import android.view.Surface; |
| |
| import com.android.camera.debug.Log; |
| import com.android.camera.util.ApiHelper; |
| |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| /** |
| * The implementation of {@link com.android.camera.app.OrientationManager} |
| * by {@link android.view.OrientationEventListener}. |
| * TODO: make this class package-private |
| */ |
| public class OrientationManagerImpl implements OrientationManager { |
| private static final Log.Tag TAG = new Log.Tag("OrientMgrImpl"); |
| |
| // Orientation hysteresis amount used in rounding, in degrees |
| private static final int ORIENTATION_HYSTERESIS = 5; |
| |
| private final Activity mActivity; |
| private final MyOrientationEventListener mOrientationListener; |
| // If the framework orientation is locked. |
| private boolean mOrientationLocked = false; |
| |
| // This is true if "Settings -> Display -> Rotation Lock" is checked. We |
| // don't allow the orientation to be unlocked if the value is true. |
| private boolean mRotationLockedSetting = false; |
| |
| private final List<OrientationChangeCallback> mListeners = |
| new ArrayList<OrientationChangeCallback>(); |
| |
| private static class OrientationChangeCallback { |
| private final Handler mHandler; |
| private final OnOrientationChangeListener mListener; |
| |
| OrientationChangeCallback(Handler handler, OnOrientationChangeListener listener) { |
| mHandler = handler; |
| mListener = listener; |
| } |
| |
| public void postOrientationChangeCallback(final int orientation) { |
| mHandler.post(new Runnable() { |
| @Override |
| public void run() { |
| mListener.onOrientationChanged(orientation); |
| } |
| }); |
| } |
| |
| @Override |
| public boolean equals(Object o) { |
| if (o != null && o instanceof OrientationChangeCallback) { |
| OrientationChangeCallback c = (OrientationChangeCallback) o; |
| if (mHandler == c.mHandler && mListener == c.mListener) { |
| return true; |
| } |
| return false; |
| } |
| return false; |
| } |
| } |
| |
| public OrientationManagerImpl(Activity activity) { |
| mActivity = activity; |
| mOrientationListener = new MyOrientationEventListener(activity); |
| } |
| |
| public void resume() { |
| ContentResolver resolver = mActivity.getContentResolver(); |
| mRotationLockedSetting = Settings.System.getInt( |
| resolver, Settings.System.ACCELEROMETER_ROTATION, 0) != 1; |
| mOrientationListener.enable(); |
| } |
| |
| public void pause() { |
| mOrientationListener.disable(); |
| } |
| |
| //////////////////////////////////////////////////////////////////////////// |
| // Orientation handling |
| // |
| // We can choose to lock the framework orientation or not. If we lock the |
| // framework orientation, we calculate a a compensation value according to |
| // current device orientation and send it to listeners. If we don't lock |
| // the framework orientation, we always set the compensation value to 0. |
| //////////////////////////////////////////////////////////////////////////// |
| |
| @Override |
| public void addOnOrientationChangeListener(Handler handler, |
| OnOrientationChangeListener listener) { |
| OrientationChangeCallback callback = new OrientationChangeCallback(handler, listener); |
| if (mListeners.contains(callback)) { |
| return; |
| } |
| mListeners.add(callback); |
| } |
| |
| @Override |
| public void removeOnOrientationChangeListener(Handler handler, |
| OnOrientationChangeListener listener) { |
| OrientationChangeCallback callback = new OrientationChangeCallback(handler, listener); |
| if (!mListeners.remove(callback)) { |
| Log.v(TAG, "Removing non-existing listener."); |
| } |
| } |
| |
| @Override |
| public void lockOrientation() { |
| if (mOrientationLocked || mRotationLockedSetting) { |
| return; |
| } |
| mOrientationLocked = true; |
| if (ApiHelper.HAS_ORIENTATION_LOCK) { |
| mActivity.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LOCKED); |
| } else { |
| mActivity.setRequestedOrientation(calculateCurrentScreenOrientation()); |
| } |
| } |
| |
| @Override |
| public void unlockOrientation() { |
| if (!mOrientationLocked || mRotationLockedSetting) { |
| return; |
| } |
| mOrientationLocked = false; |
| Log.d(TAG, "unlock orientation"); |
| mActivity.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_FULL_SENSOR); |
| } |
| |
| private int calculateCurrentScreenOrientation() { |
| int displayRotation = getDisplayRotation(); |
| // Display rotation >= 180 means we need to use the REVERSE landscape/portrait |
| boolean standard = displayRotation < 180; |
| if (mActivity.getResources().getConfiguration().orientation |
| == Configuration.ORIENTATION_LANDSCAPE) { |
| return standard |
| ? ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE |
| : ActivityInfo.SCREEN_ORIENTATION_REVERSE_LANDSCAPE; |
| } else { |
| if (displayRotation == 90 || displayRotation == 270) { |
| // If displayRotation = 90 or 270 then we are on a landscape |
| // device. On landscape devices, portrait is a 90 degree |
| // clockwise rotation from landscape, so we need |
| // to flip which portrait we pick as display rotation is counter clockwise |
| standard = !standard; |
| } |
| return standard |
| ? ActivityInfo.SCREEN_ORIENTATION_PORTRAIT |
| : ActivityInfo.SCREEN_ORIENTATION_REVERSE_PORTRAIT; |
| } |
| } |
| |
| // This listens to the device orientation, so we can update the compensation. |
| private class MyOrientationEventListener extends OrientationEventListener { |
| public MyOrientationEventListener(Context context) { |
| super(context); |
| } |
| |
| @Override |
| public void onOrientationChanged(int orientation) { |
| // We keep the last known orientation. So if the user first orient |
| // the camera then point the camera to floor or sky, we still have |
| // the correct orientation. |
| if (orientation == ORIENTATION_UNKNOWN) { |
| return; |
| } |
| final int roundedOrientation = roundOrientation(orientation, 0); |
| |
| for (OrientationChangeCallback l : mListeners) { |
| l.postOrientationChangeCallback(roundedOrientation); |
| } |
| } |
| } |
| |
| @Override |
| public int getDisplayRotation() { |
| return getDisplayRotation(mActivity); |
| } |
| |
| private static int roundOrientation(int orientation, int orientationHistory) { |
| boolean changeOrientation = false; |
| if (orientationHistory == OrientationEventListener.ORIENTATION_UNKNOWN) { |
| changeOrientation = true; |
| } else { |
| int dist = Math.abs(orientation - orientationHistory); |
| dist = Math.min(dist, 360 - dist); |
| changeOrientation = (dist >= 45 + ORIENTATION_HYSTERESIS); |
| } |
| if (changeOrientation) { |
| return ((orientation + 45) / 90 * 90) % 360; |
| } |
| return orientationHistory; |
| } |
| |
| private static int getDisplayRotation(Activity activity) { |
| int rotation = activity.getWindowManager().getDefaultDisplay() |
| .getRotation(); |
| switch (rotation) { |
| case Surface.ROTATION_0: return 0; |
| case Surface.ROTATION_90: return 90; |
| case Surface.ROTATION_180: return 180; |
| case Surface.ROTATION_270: return 270; |
| } |
| return 0; |
| } |
| } |