CardLayout.java

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/*
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* Copyright 2013 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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*     http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.example.android.batchstepsensor.cardstream;
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import android.content.Context;
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import android.util.AttributeSet;
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import android.view.MotionEvent;
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import android.view.ViewConfiguration;
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import android.widget.RelativeLayout;
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/**
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 * Custom Button with a special 'pressed' effect for touch events.
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 */
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public class CardLayout extends RelativeLayout {
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    private boolean mSwiping = false;
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    private float mDownX = 0.f;
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    private float mDownY = 0.f;
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    private float mTouchSlop = 0.f;
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    public CardLayout(Context context) {
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        super(context);
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        init();
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    }
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    public CardLayout(Context context, AttributeSet attrs) {
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        super(context, attrs);
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        init();
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    }
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    public CardLayout(Context context, AttributeSet attrs, int defStyle) {
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        super(context, attrs, defStyle);
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        init();
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    }
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    private void init(){
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        setFocusable(true);
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        setDescendantFocusability(FOCUS_AFTER_DESCENDANTS);
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        setWillNotDraw(false);
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        setClickable(true);
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        mTouchSlop = ViewConfiguration.get(getContext()).getScaledTouchSlop() * 2.f;
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    }
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    @Override
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    public boolean onTouchEvent(MotionEvent event) {
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        switch(event.getAction()){
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            case MotionEvent.ACTION_CANCEL:
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            case MotionEvent.ACTION_UP:
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                mSwiping = false;
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                break;
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        }
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        return super.onTouchEvent(event);
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    }
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    @Override
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    public boolean onInterceptTouchEvent(MotionEvent event) {
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        switch(event.getAction()){
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            case MotionEvent.ACTION_MOVE:
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                if( !mSwiping ){
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                    mSwiping = Math.abs(mDownX - event.getX()) > mTouchSlop;
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                }
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                break;
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            case MotionEvent.ACTION_DOWN:
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                mDownX = event.getX();
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                mDownY = event.getY();
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                mSwiping = false;
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                break;
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            case MotionEvent.ACTION_CANCEL:
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            case MotionEvent.ACTION_UP:
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                mSwiping = false;
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                break;
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        }
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        return mSwiping;
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    }
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}