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Android滑动页面返回（自定义控件）
今天看了下腾讯微博，看到“赞你的人”可以向右滑动然后直接返回上一级，兴趣一来，抽点空就把这个控件给做了。先看几张效果图，本人不会做gif,亲们能理解就OK了。
话不多说，现在直接贴出源码吧。
首先看下调用方式
package com.fay.backwidget;import android.app.Activity;import android.os.Bundle;import com.fay.backwidget.SlidingBackLinearLayout.FinishCallBack;/** * @version 1.0 * @author Fay * @since 2014/8/28 */public class SlidingBackActivity extends Activity { private SlidingBackLinearLayout mBackLinearLayout = null; @Override protected void onCreate(Bundle savedInstanceState) { // TODO Auto-generated method stub super.onCreate(savedInstanceState); setContentView(R.layout.activity_two); mBackLinearLayout = (SlidingBackLinearLayout) findViewById(R.id.back_linearlayout); mBackLinearLayout.setFinishCallBack(new FinishCallBack() { @Override public void finish() { // TODO Auto-generated method stub SlidingBackActivity.this.finish(); } }); }}可以看到调用的方式十分简单，这就是我们每一个开发者追求的，高内聚低耦合，下面我把自定义控件贴出来吧。
package com.fay.backwidget;import android.annotation.SuppressLint;import android.content.Context;import android.graphics.Canvas;import android.util.AttributeSet;import android.util.DisplayMetrics;import android.view.MotionEvent;import android.view.WindowManager;import android.view.animation.DecelerateInterpolator;import android.view.animation.Interpolator;import android.widget.LinearLayout;import android.widget.Scroller;/** * @version 1.0 * @author Fay * @since 2014/8/28 */@SuppressLint("NewApi")public class SlidingBackLinearLayout extends LinearLayout { private int xLastTouchLocation; private int xCurrentTouchLocation; private int detaX; private boolean isClose = false; private int windowWidth ; private Scroller mScroller = null; private Interpolator mInterpolator = null; private FinishCallBack mFinishCallBack = null; public SlidingBackLinearLayout(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); // TODO Auto-generated constructor stub init(context); } public SlidingBackLinearLayout(Context context, AttributeSet attrs) { super(context, attrs); // TODO Auto-generated constructor stub init(context); } public SlidingBackLinearLayout(Context context) { super(context); // TODO Auto-generated constructor stub init(context); } private void init(Context mContext) { mInterpolator = new DecelerateInterpolator(); mScroller = new Scroller(mContext, mInterpolator); DisplayMetrics mDisplayMetrics = new DisplayMetrics(); WindowManager mWindowManager = (WindowManager) mContext.getSystemService(mContext.WINDOW_SERVICE); mWindowManager.getDefaultDisplay().getMetrics(mDisplayMetrics); windowWidth = mDisplayMetrics.widthPixels; } public interface FinishCallBack{ void finish(); } public void setFinishCallBack(FinishCallBack mFinishCallBack) { this.mFinishCallBack = mFinishCallBack; } @Override protected void onDraw(Canvas canvas) { // TODO Auto-generated method stub super.onDraw(canvas); } @Override public boolean onTouchEvent(MotionEvent event) { // TODO Auto-generated method stub switch (event.getAction()) { case MotionEvent.ACTION_DOWN: xLastTouchLocation = (int) event.getX(); return true; case MotionEvent.ACTION_MOVE: xCurrentTouchLocation = (int) event.getX(); detaX = xLastTouchLocation - xCurrentTouchLocation; if (detaX < 0) { if (null != mFinishCallBack) { scrollTo( detaX, 0); } } break; case MotionEvent.ACTION_UP: xCurrentTouchLocation = (int) event.getX(); detaX = xLastTouchLocation - xCurrentTouchLocation; if (detaX < 0) { if (null != mFinishCallBack) { if (- detaX >= windowWidth / 2) { // close isClose = true; startMove( -(windowWidth + detaX)); } else { startMove(- detaX); } } } break; } return super.onTouchEvent(event); } private void startMove(int deta) { mScroller.startScroll(getScrollX(), 0, deta, 0); invalidate(); } @Override public void computeScroll() { // TODO Auto-generated method stub super.computeScroll(); if (mScroller.computeScrollOffset()) { scrollTo(mScroller.getCurrX(), mScroller.getCurrY()); postInvalidate(); } else { if (isClose) { if (null != mFinishCallBack) { mFinishCallBack.finish(); } } } }}其实就是这么简单，希望大家有所收获。
Android滑动页面返回（自定义控件）
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