1 /* 2 * Copyright (C) 2012 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.android.gallery3d.app; 18 19 import android.app.Activity; 20 import android.content.ContentResolver; 21 import android.content.Context; 22 import android.content.pm.ActivityInfo; 23 import android.content.res.Configuration; 24 import android.provider.Settings; 25 import android.view.OrientationEventListener; 26 import android.view.Surface; 27 28 import com.android.gallery3d.common.ApiHelper; 29 import com.android.gallery3d.ui.OrientationSource; 30 31 public class OrientationManager implements OrientationSource { 32 private static final String TAG = "OrientationManager"; 33 34 // Orientation hysteresis amount used in rounding, in degrees 35 private static final int ORIENTATION_HYSTERESIS = 5; 36 37 private Activity mActivity; 38 private MyOrientationEventListener mOrientationListener; 39 // If the framework orientation is locked. 40 private boolean mOrientationLocked = false; 41 42 // This is true if "Settings -> Display -> Rotation Lock" is checked. We 43 // don't allow the orientation to be unlocked if the value is true. 44 private boolean mRotationLockedSetting = false; 45 46 public OrientationManager(Activity activity) { 47 mActivity = activity; 48 mOrientationListener = new MyOrientationEventListener(activity); 49 } 50 51 public void resume() { 52 ContentResolver resolver = mActivity.getContentResolver(); 53 mRotationLockedSetting = Settings.System.getInt( 54 resolver, Settings.System.ACCELEROMETER_ROTATION, 0) != 1; 55 mOrientationListener.enable(); 56 } 57 58 public void pause() { 59 mOrientationListener.disable(); 60 } 61 62 //////////////////////////////////////////////////////////////////////////// 63 // Orientation handling 64 // 65 // We can choose to lock the framework orientation or not. If we lock the 66 // framework orientation, we calculate a a compensation value according to 67 // current device orientation and send it to listeners. If we don't lock 68 // the framework orientation, we always set the compensation value to 0. 69 //////////////////////////////////////////////////////////////////////////// 70 71 // Lock the framework orientation to the current device orientation 72 public void lockOrientation() { 73 if (mOrientationLocked) return; 74 mOrientationLocked = true; 75 if (ApiHelper.HAS_ORIENTATION_LOCK) { 76 mActivity.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LOCKED); 77 } else { 78 mActivity.setRequestedOrientation(calculateCurrentScreenOrientation()); 79 } 80 } 81 82 // Unlock the framework orientation, so it can change when the device 83 // rotates. 84 public void unlockOrientation() { 85 if (!mOrientationLocked) return; 86 mOrientationLocked = false; 87 Log.d(TAG, "unlock orientation"); 88 mActivity.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_FULL_SENSOR); 89 } 90 91 private int calculateCurrentScreenOrientation() { 92 int displayRotation = getDisplayRotation(); 93 // Display rotation >= 180 means we need to use the REVERSE landscape/portrait 94 boolean standard = displayRotation < 180; 95 if (mActivity.getResources().getConfiguration().orientation 96 == Configuration.ORIENTATION_LANDSCAPE) { 97 return standard 98 ? ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE 99 : ActivityInfo.SCREEN_ORIENTATION_REVERSE_LANDSCAPE; 100 } else { 101 if (displayRotation == 90 || displayRotation == 270) { 102 // If displayRotation = 90 or 270 then we are on a landscape 103 // device. On landscape devices, portrait is a 90 degree 104 // clockwise rotation from landscape, so we need 105 // to flip which portrait we pick as display rotation is counter clockwise 106 standard = !standard; 107 } 108 return standard 109 ? ActivityInfo.SCREEN_ORIENTATION_PORTRAIT 110 : ActivityInfo.SCREEN_ORIENTATION_REVERSE_PORTRAIT; 111 } 112 } 113 114 // This listens to the device orientation, so we can update the compensation. 115 private class MyOrientationEventListener extends OrientationEventListener { 116 public MyOrientationEventListener(Context context) { 117 super(context); 118 } 119 120 @Override 121 public void onOrientationChanged(int orientation) { 122 // We keep the last known orientation. So if the user first orient 123 // the camera then point the camera to floor or sky, we still have 124 // the correct orientation. 125 if (orientation == ORIENTATION_UNKNOWN) return; 126 orientation = roundOrientation(orientation, 0); 127 } 128 } 129 130 @Override 131 public int getDisplayRotation() { 132 return getDisplayRotation(mActivity); 133 } 134 135 @Override 136 public int getCompensation() { 137 return 0; 138 } 139 140 private static int roundOrientation(int orientation, int orientationHistory) { 141 boolean changeOrientation = false; 142 if (orientationHistory == OrientationEventListener.ORIENTATION_UNKNOWN) { 143 changeOrientation = true; 144 } else { 145 int dist = Math.abs(orientation - orientationHistory); 146 dist = Math.min(dist, 360 - dist); 147 changeOrientation = (dist >= 45 + ORIENTATION_HYSTERESIS); 148 } 149 if (changeOrientation) { 150 return ((orientation + 45) / 90 * 90) % 360; 151 } 152 return orientationHistory; 153 } 154 155 private static int getDisplayRotation(Activity activity) { 156 int rotation = activity.getWindowManager().getDefaultDisplay() 157 .getRotation(); 158 switch (rotation) { 159 case Surface.ROTATION_0: return 0; 160 case Surface.ROTATION_90: return 90; 161 case Surface.ROTATION_180: return 180; 162 case Surface.ROTATION_270: return 270; 163 } 164 return 0; 165 } 166 } 167
