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.batchstepsensor.cardstream; 18 19 import android.content.Context; 20 import android.util.AttributeSet; 21 import android.view.MotionEvent; 22 import android.view.ViewConfiguration; 23 import android.widget.RelativeLayout; 24 25 /** 26 * Custom Button with a special 'pressed' effect for touch events. 27 */ 28 public class CardLayout extends RelativeLayout { 29 30 private boolean mSwiping = false; 31 private float mDownX = 0.f; 32 private float mDownY = 0.f; 33 private float mTouchSlop = 0.f; 34 CardLayout(Context context)35 public CardLayout(Context context) { 36 super(context); 37 init(); 38 } 39 CardLayout(Context context, AttributeSet attrs)40 public CardLayout(Context context, AttributeSet attrs) { 41 super(context, attrs); 42 init(); 43 } 44 CardLayout(Context context, AttributeSet attrs, int defStyle)45 public CardLayout(Context context, AttributeSet attrs, int defStyle) { 46 super(context, attrs, defStyle); 47 init(); 48 } 49 init()50 private void init(){ 51 setFocusable(true); 52 setDescendantFocusability(FOCUS_AFTER_DESCENDANTS); 53 setWillNotDraw(false); 54 setClickable(true); 55 56 mTouchSlop = ViewConfiguration.get(getContext()).getScaledTouchSlop() * 2.f; 57 } 58 59 @Override onTouchEvent(MotionEvent event)60 public boolean onTouchEvent(MotionEvent event) { 61 switch(event.getAction()){ 62 case MotionEvent.ACTION_CANCEL: 63 case MotionEvent.ACTION_UP: 64 mSwiping = false; 65 break; 66 } 67 return super.onTouchEvent(event); 68 } 69 70 @Override onInterceptTouchEvent(MotionEvent event)71 public boolean onInterceptTouchEvent(MotionEvent event) { 72 73 switch(event.getAction()){ 74 case MotionEvent.ACTION_MOVE: 75 if( !mSwiping ){ 76 mSwiping = Math.abs(mDownX - event.getX()) > mTouchSlop; 77 } 78 break; 79 case MotionEvent.ACTION_DOWN: 80 mDownX = event.getX(); 81 mDownY = event.getY(); 82 mSwiping = false; 83 break; 84 case MotionEvent.ACTION_CANCEL: 85 case MotionEvent.ACTION_UP: 86 mSwiping = false; 87 break; 88 } 89 return mSwiping; 90 } 91 }