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      1 /*
      2  * Copyright 2013 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.example.android.basicgesturedetect;
     18 
     19 import android.annotation.TargetApi;
     20 import android.os.Build;
     21 import android.view.GestureDetector;
     22 import android.view.MotionEvent;
     23 
     24 import com.example.android.common.logger.Log;
     25 
     26 public class GestureListener extends GestureDetector.SimpleOnGestureListener {
     27 
     28     public static final String TAG = "GestureListener";
     29 
     30     // BEGIN_INCLUDE(init_gestureListener)
     31     @Override
     32     public boolean onSingleTapUp(MotionEvent e) {
     33         // Up motion completing a single tap occurred.
     34         Log.i(TAG, "Single Tap Up" + getTouchType(e));
     35         return false;
     36     }
     37 
     38     @Override
     39     public void onLongPress(MotionEvent e) {
     40         // Touch has been long enough to indicate a long press.
     41         // Does not indicate motion is complete yet (no up event necessarily)
     42         Log.i(TAG, "Long Press" + getTouchType(e));
     43     }
     44 
     45     @Override
     46     public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX,
     47     float distanceY) {
     48         // User attempted to scroll
     49         Log.i(TAG, "Scroll" + getTouchType(e1));
     50         return false;
     51     }
     52 
     53     @Override
     54     public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,
     55     float velocityY) {
     56         // Fling event occurred.  Notification of this one happens after an "up" event.
     57         Log.i(TAG, "Fling" + getTouchType(e1));
     58         return false;
     59     }
     60 
     61     @Override
     62     public void onShowPress(MotionEvent e) {
     63         // User performed a down event, and hasn't moved yet.
     64         Log.i(TAG, "Show Press" + getTouchType(e));
     65     }
     66 
     67     @Override
     68     public boolean onDown(MotionEvent e) {
     69         // "Down" event - User touched the screen.
     70         Log.i(TAG, "Down" + getTouchType(e));
     71         return false;
     72     }
     73 
     74     @Override
     75     public boolean onDoubleTap(MotionEvent e) {
     76         // User tapped the screen twice.
     77         Log.i(TAG, "Double tap" + getTouchType(e));
     78         return false;
     79     }
     80 
     81     @Override
     82     public boolean onDoubleTapEvent(MotionEvent e) {
     83         // Since double-tap is actually several events which are considered one aggregate
     84         // gesture, there's a separate callback for an individual event within the doubletap
     85         // occurring.  This occurs for down, up, and move.
     86         Log.i(TAG, "Event within double tap" + getTouchType(e));
     87         return false;
     88     }
     89 
     90     @Override
     91     public boolean onSingleTapConfirmed(MotionEvent e) {
     92         // A confirmed single-tap event has occurred.  Only called when the detector has
     93         // determined that the first tap stands alone, and is not part of a double tap.
     94         Log.i(TAG, "Single tap confirmed" + getTouchType(e));
     95         return false;
     96     }
     97     // END_INCLUDE(init_gestureListener)
     98 
     99 
    100     /**
    101      * Returns a human-readable string describing the type of touch that triggered a MotionEvent.
    102      */
    103 
    104     private static String getTouchType(MotionEvent e){
    105 
    106         String touchTypeDescription = " ";
    107         int touchType = e.getToolType(0);
    108 
    109         switch (touchType) {
    110             case MotionEvent.TOOL_TYPE_FINGER:
    111                 touchTypeDescription += "(finger)";
    112                 break;
    113             case MotionEvent.TOOL_TYPE_STYLUS:
    114                 touchTypeDescription += "(stylus, ";
    115                 //Get some additional information about the stylus touch
    116                 float stylusPressure = e.getPressure();
    117                 touchTypeDescription += "pressure: " + stylusPressure;
    118 
    119                 if(Build.VERSION.SDK_INT >= 21) {
    120                     touchTypeDescription += ", buttons pressed: " + getButtonsPressed(e);
    121                 }
    122 
    123                 touchTypeDescription += ")";
    124                 break;
    125             case MotionEvent.TOOL_TYPE_ERASER:
    126                 touchTypeDescription += "(eraser)";
    127                 break;
    128             case MotionEvent.TOOL_TYPE_MOUSE:
    129                 touchTypeDescription += "(mouse)";
    130                 break;
    131             default:
    132                 touchTypeDescription += "(unknown tool)";
    133                 break;
    134         }
    135 
    136         return touchTypeDescription;
    137     }
    138 
    139     /**
    140      * Returns a human-readable string listing all the stylus buttons that were pressed when the
    141      * input MotionEvent occurred.
    142      */
    143     @TargetApi(21)
    144     private static String getButtonsPressed(MotionEvent e){
    145         String buttons = "";
    146 
    147         if(e.isButtonPressed(MotionEvent.BUTTON_PRIMARY)){
    148             buttons += " primary";
    149         }
    150 
    151         if(e.isButtonPressed(MotionEvent.BUTTON_SECONDARY)){
    152             buttons += " secondary";
    153         }
    154 
    155         if(e.isButtonPressed(MotionEvent.BUTTON_TERTIARY)){
    156             buttons += " tertiary";
    157         }
    158 
    159         if(e.isButtonPressed(MotionEvent.BUTTON_BACK)){
    160             buttons += " back";
    161         }
    162 
    163         if(e.isButtonPressed(MotionEvent.BUTTON_FORWARD)){
    164             buttons += " forward";
    165         }
    166 
    167         if (buttons.equals("")){
    168             buttons = "none";
    169         }
    170 
    171         return buttons;
    172     }
    173 
    174 }
    175