HumanInteractionClassifier.java revision 6dc59b48c040cf6871d7ff6d8e5242b1a5ddd032
1/* 2 * Copyright (C) 2015 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 17package com.android.systemui.classifier; 18 19import android.content.Context; 20import android.database.ContentObserver; 21import android.hardware.SensorEvent; 22import android.os.Build; 23import android.os.Handler; 24import android.os.UserHandle; 25import android.provider.Settings; 26import android.view.MotionEvent; 27 28import java.util.ArrayList; 29 30/** 31 * An classifier trying to determine whether it is a human interacting with the phone or not. 32 */ 33public class HumanInteractionClassifier extends Classifier { 34 private static final String HIC_ENABLE = "HIC_enable"; 35 private static HumanInteractionClassifier sInstance = null; 36 37 private final Handler mHandler = new Handler(); 38 private final Context mContext; 39 40 private ArrayList<StrokeClassifier> mStrokeClassifiers = new ArrayList<>(); 41 private ArrayList<GestureClassifier> mGestureClassifiers = new ArrayList<>(); 42 private final int mStrokeClassifiersSize; 43 private final int mGestureClassifiersSize; 44 45 private HistoryEvaluator mHistoryEvaluator; 46 private boolean mEnableClassifier = false; 47 private int mCurrentType = Classifier.GENERIC; 48 49 protected final ContentObserver mSettingsObserver = new ContentObserver(mHandler) { 50 @Override 51 public void onChange(boolean selfChange) { 52 updateConfiguration(); 53 } 54 }; 55 56 private HumanInteractionClassifier(Context context) { 57 mContext = context; 58 mClassifierData = new ClassifierData(mContext.getResources().getDisplayMetrics().xdpi, 59 mContext.getResources().getDisplayMetrics().ydpi); 60 mHistoryEvaluator = new HistoryEvaluator(); 61 62 mStrokeClassifiers.add(new AnglesVarianceClassifier(mClassifierData)); 63 mStrokeClassifiers.add(new SpeedClassifier(mClassifierData)); 64 mStrokeClassifiers.add(new DurationCountClassifier(mClassifierData)); 65 mStrokeClassifiers.add(new EndPointRatioClassifier(mClassifierData)); 66 mStrokeClassifiers.add(new EndPointLengthClassifier(mClassifierData)); 67 mStrokeClassifiers.add(new AccelerationClassifier(mClassifierData)); 68 mStrokeClassifiers.add(new SpeedVarianceClassifier(mClassifierData)); 69 mStrokeClassifiers.add(new LengthCountClassifier(mClassifierData)); 70 71 mGestureClassifiers.add(new PointerCountClassifier(mClassifierData)); 72 mGestureClassifiers.add(new ProximityClassifier(mClassifierData)); 73 74 mStrokeClassifiersSize = mStrokeClassifiers.size(); 75 mGestureClassifiersSize = mGestureClassifiers.size(); 76 77 mContext.getContentResolver().registerContentObserver( 78 Settings.Global.getUriFor(HIC_ENABLE), false, 79 mSettingsObserver, 80 UserHandle.USER_ALL); 81 82 updateConfiguration(); 83 } 84 85 public static HumanInteractionClassifier getInstance(Context context) { 86 if (sInstance == null) { 87 sInstance = new HumanInteractionClassifier(context); 88 } 89 return sInstance; 90 } 91 92 private void updateConfiguration() { 93 mEnableClassifier = Build.IS_DEBUGGABLE && 0 != Settings.Global.getInt( 94 mContext.getContentResolver(), 95 HIC_ENABLE, 0); 96 } 97 98 public void setType(int type) { 99 mCurrentType = type; 100 } 101 102 @Override 103 public void onTouchEvent(MotionEvent event) { 104 if (mEnableClassifier) { 105 mClassifierData.update(event); 106 107 for (int i = 0; i < mStrokeClassifiersSize; i++) { 108 mStrokeClassifiers.get(i).onTouchEvent(event); 109 } 110 111 for (int i = 0; i < mGestureClassifiersSize; i++) { 112 mGestureClassifiers.get(i).onTouchEvent(event); 113 } 114 115 int size = mClassifierData.getEndingStrokes().size(); 116 for (int i = 0; i < size; i++) { 117 Stroke stroke = mClassifierData.getEndingStrokes().get(i); 118 float evaluation = 0.0f; 119 for (int j = 0; j < mStrokeClassifiersSize; j++) { 120 evaluation += mStrokeClassifiers.get(j).getFalseTouchEvaluation( 121 mCurrentType, stroke); 122 } 123 mHistoryEvaluator.addStroke(evaluation); 124 } 125 126 int action = event.getActionMasked(); 127 if (action == MotionEvent.ACTION_UP || action == MotionEvent.ACTION_CANCEL) { 128 float evaluation = 0.0f; 129 for (int i = 0; i < mGestureClassifiersSize; i++) { 130 evaluation += mGestureClassifiers.get(i).getFalseTouchEvaluation(mCurrentType); 131 } 132 mHistoryEvaluator.addGesture(evaluation); 133 setType(Classifier.GENERIC); 134 } 135 136 mClassifierData.cleanUp(event); 137 } 138 } 139 140 @Override 141 public void onSensorChanged(SensorEvent event) { 142 for (int i = 0; i < mStrokeClassifiers.size(); i++) { 143 mStrokeClassifiers.get(i).onSensorChanged(event); 144 } 145 146 for (int i = 0; i < mGestureClassifiers.size(); i++) { 147 mGestureClassifiers.get(i).onSensorChanged(event); 148 } 149 } 150 151 public boolean isFalseTouch() { 152 if (mEnableClassifier) { 153 return mHistoryEvaluator.getEvaluation() >= 5.0f; 154 } 155 return false; 156 } 157 158 public boolean isEnabled() { 159 return mEnableClassifier; 160 } 161} 162