增加下拉关闭Activity控件
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zengfantian
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93697df683
commit
8f5837b3c9
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package com.zftlive.android.view;
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import java.util.LinkedList;
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import java.util.List;
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import com.zftlive.android.R;
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import android.app.Activity;
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import android.content.Context;
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import android.content.res.TypedArray;
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import android.graphics.Canvas;
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import android.graphics.Rect;
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import android.graphics.drawable.Drawable;
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import android.support.v4.view.ViewPager;
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import android.util.AttributeSet;
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import android.util.Log;
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import android.view.MotionEvent;
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import android.view.View;
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import android.view.ViewConfiguration;
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import android.view.ViewGroup;
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import android.widget.FrameLayout;
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import android.widget.Scroller;
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/**
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* 下拉关闭当前Activity，解决掉Listview、ScrollView、ViewPager事件冲突问题
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*
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* @author 曾繁添&&xiaanming
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* @blog http://blog.csdn.net/xiaanming
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*
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*/
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public class PullDownRemoveLayout extends FrameLayout {
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private static final String TAG = PullDownRemoveLayout.class.getSimpleName();
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private View mContentView;
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private int mTouchSlop;
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private int downX;
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private int downY;
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private int tempY;
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private Scroller mScroller;
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private int viewHeight;
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private boolean isSilding;
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private boolean isFinish;
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private Drawable mShadowDrawable;
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private Activity mActivity;
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private List<ViewPager> mViewPagers = new LinkedList<ViewPager>();
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public PullDownRemoveLayout(Context context, AttributeSet attrs) {
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this(context, attrs, 0);
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}
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public PullDownRemoveLayout(Context context, AttributeSet attrs, int defStyle) {
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super(context, attrs, defStyle);
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mTouchSlop = ViewConfiguration.get(context).getScaledTouchSlop();
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mScroller = new Scroller(context);
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mShadowDrawable = getResources().getDrawable(R.drawable.view_swipeback_shadow_left);
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}
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public void attachToActivity(Activity activity) {
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mActivity = activity;
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TypedArray a = activity.getTheme().obtainStyledAttributes(
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new int[] { android.R.attr.windowBackground });
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int background = a.getResourceId(0, 0);
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a.recycle();
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ViewGroup decor = (ViewGroup) activity.getWindow().getDecorView();
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ViewGroup decorChild = (ViewGroup) decor.getChildAt(0);
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decorChild.setBackgroundResource(background);
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decor.removeView(decorChild);
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addView(decorChild);
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setContentView(decorChild);
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decor.addView(this);
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}
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private void setContentView(View decorChild) {
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mContentView = (View) decorChild.getParent();
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}
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/**
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* 事件拦截操作
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*/
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@Override
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public boolean onInterceptTouchEvent(MotionEvent ev) {
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//处理ViewPager冲突问题
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ViewPager mViewPager = getTouchViewPager(mViewPagers, ev);
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Log.i(TAG, "mViewPager = " + mViewPager);
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if(mViewPager != null && mViewPager.getCurrentItem() != 0){
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return super.onInterceptTouchEvent(ev);
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}
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switch (ev.getAction()) {
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case MotionEvent.ACTION_DOWN:
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downY = tempY = (int) ev.getRawY();
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downX = (int) ev.getRawX();
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break;
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case MotionEvent.ACTION_MOVE:
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int moveY = (int) ev.getRawY();
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// 满足此条件屏蔽SildingFinishLayout里面子类的touch事件
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if (moveY - downY > mTouchSlop
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&& Math.abs((int) ev.getRawX() - downX) < mTouchSlop) {
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return true;
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}
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break;
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}
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return super.onInterceptTouchEvent(ev);
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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_MOVE:
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int moveY = (int) event.getRawY();
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int deltaY = tempY - moveY;
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tempY = moveY;
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if (moveY - downY > mTouchSlop
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&& Math.abs((int) event.getRawX() - downX) < mTouchSlop) {
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isSilding = true;
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}
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if (moveY - downY >= 0 && isSilding) {
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mContentView.scrollBy(0, deltaY);
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}
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break;
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case MotionEvent.ACTION_UP:
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isSilding = false;
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//TODO 控制下拉高度多少执行移除操作（默认下拉到屏幕高度1/3）
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if (mContentView.getScrollY() <= -viewHeight / 3) {
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isFinish = true;
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scrollRight();
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} else {
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scrollOrigin();
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isFinish = false;
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}
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break;
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}
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return true;
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}
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/**
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* 获取SwipeBackLayout里面的ViewPager的集合
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* @param mViewPagers
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* @param parent
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*/
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private void getAlLViewPager(List<ViewPager> mViewPagers, ViewGroup parent){
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int childCount = parent.getChildCount();
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for(int i=0; i<childCount; i++){
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View child = parent.getChildAt(i);
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if(child instanceof ViewPager){
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mViewPagers.add((ViewPager)child);
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}else if(child instanceof ViewGroup){
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getAlLViewPager(mViewPagers, (ViewGroup)child);
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}
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}
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}
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/**
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* 返回我们touch的ViewPager
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* @param mViewPagers
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* @param ev
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* @return
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*/
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private ViewPager getTouchViewPager(List<ViewPager> mViewPagers, MotionEvent ev){
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if(mViewPagers == null || mViewPagers.size() == 0){
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return null;
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}
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Rect mRect = new Rect();
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for(ViewPager v : mViewPagers){
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v.getHitRect(mRect);
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if(mRect.contains((int)ev.getX(), (int)ev.getY())){
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return v;
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}
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}
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return null;
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}
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@Override
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protected void onLayout(boolean changed, int l, int t, int r, int b) {
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super.onLayout(changed, l, t, r, b);
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if (changed) {
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viewHeight = this.getHeight();
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getAlLViewPager(mViewPagers, this);
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Log.i(TAG, "ViewPager size = " + mViewPagers.size());
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}
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}
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@Override
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protected void dispatchDraw(Canvas canvas) {
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super.dispatchDraw(canvas);
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if (mShadowDrawable != null && mContentView != null) {
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int left = mContentView.getLeft()- mShadowDrawable.getIntrinsicWidth();
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int right = left + mShadowDrawable.getIntrinsicWidth();
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int top = mContentView.getTop();
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int bottom = mContentView.getBottom();
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mShadowDrawable.setBounds(left, top, right, bottom);
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mShadowDrawable.draw(canvas);
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}
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}
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/**
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* 滚动出界面
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*/
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private void scrollRight() {
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final int delta = (viewHeight + mContentView.getScrollY());
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// 调用startScroll方法来设置一些滚动的参数，我们在computeScroll()方法中调用scrollTo来滚动item
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mScroller.startScroll(0, mContentView.getScrollY(), 0, -delta + 1,Math.abs(delta));
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postInvalidate();
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}
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/**
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* 滚动到起始位置
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*/
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private void scrollOrigin() {
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int delta = mContentView.getScrollX();
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mScroller.startScroll(0, mContentView.getScrollX(), 0, -delta,Math.abs(delta));
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postInvalidate();
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}
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@Override
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public void computeScroll() {
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// 调用startScroll的时候scroller.computeScrollOffset()返回true，
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if (mScroller.computeScrollOffset()) {
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mContentView.scrollTo(mScroller.getCurrX(), mScroller.getCurrY());
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postInvalidate();
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if (mScroller.isFinished() && isFinish) {
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mActivity.finish();
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}
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}
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}
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}
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