一、前言
老规矩，别的不说，这demo是找了很相关知识集合而成的，可以说对我这种小白来说是绞尽脑汁！程序员讲的是无图无真相！
现在大家一睹为快！
二、比较关键的还是scroller这个类的
package com.icq.slideview.view; import android.content.Context; import android.util.AttributeSet; import android.util.Log; import android.util.TypedValue; import android.view.MotionEvent; import android.view.View; import android.widget.LinearLayout; import android.widget.RelativeLayout; import android.widget.Scroller; import android.widget.TextView; import com.icq.slideview.R; public class SlideView extends LinearLayout { private static final String TAG = SlideView; private Context mContext; private LinearLayout mViewContent; private RelativeLayout mHolder; private Scroller mScroller; private OnSlideListener mOnSlideListener; private int mHolderWidth = 120; private int mLastX = 0; private int mLastY = 0; private static final int TAN = 2; public interface OnSlideListener { public static final int SLIDE_STATUS_OFF = 0; public static final int SLIDE_STATUS_START_SCROLL = 1; public static final int SLIDE_STATUS_ON = 2; /** * @param view current SlideView * @param status SLIDE_STATUS_ON or SLIDE_STATUS_OFF */ public void onSlide(View view, int status); } public SlideView(Context context) { super(context); initView(); } public SlideView(Context context, AttributeSet attrs) { super(context, attrs); initView(); } private void initView() { mContext = getContext(); mScroller = new Scroller(mContext); setOrientation(LinearLayout.HORIZONTAL); View.inflate(mContext, R.layout.slide_view_merge, this); mViewContent = (LinearLayout) findViewById(R.id.view_content); mHolderWidth = Math.round(TypedValue.applyDimension( TypedValue.COMPLEX_UNIT_DIP, mHolderWidth, getResources() .getDisplayMetrics())); } public void setButtonText(CharSequence text) { ((TextView)findViewById(R.id.delete)).setText(text); } public void setContentView(View view) { mViewContent.addView(view); } public void setOnSlideListener(OnSlideListener onSlideListener) { mOnSlideListener = onSlideListener; } public void shrink() { if (getScrollX() != 0) { this.smoothScrollTo(0, 0); } } public void onRequireTouchEvent(MotionEvent event) { int x = (int) event.getX(); int y = (int) event.getY(); int scrollX = getScrollX(); Log.d(TAG, x= + x + y= + y); switch (event.getAction()) { case MotionEvent.ACTION_DOWN: { int deltaX = x - mLastX; System.out.println(按下偏移+deltaX); if (!mScroller.isFinished()) { mScroller.abortAnimation(); } if (mOnSlideListener != null) { mOnSlideListener.onSlide(this, OnSlideListener.SLIDE_STATUS_START_SCROLL); } break; } case MotionEvent.ACTION_MOVE: { int deltaX = x - mLastX; int deltaY = y - mLastY; System.out.println(偏移+deltaX); if (Math.abs(deltaX) < Math.abs(deltaY) * TAN) { break; } int newScrollX = scrollX - deltaX; if (deltaX != 0) { if (newScrollX < 0) { newScrollX = 0; } else if (newScrollX > mHolderWidth) { newScrollX = mHolderWidth; } this.scrollTo(newScrollX, 0); } break; } case MotionEvent.ACTION_UP: { int newScrollX = 0; if (scrollX - mHolderWidth * 0.75 > 0) { newScrollX = mHolderWidth; } this.smoothScrollTo(newScrollX, 0); if (mOnSlideListener != null) { mOnSlideListener.onSlide(this, newScrollX == 0 ? OnSlideListener.SLIDE_STATUS_OFF : OnSlideListener.SLIDE_STATUS_ON); } break; } default: break; } mLastX = x; mLastY = y; } private void smoothScrollTo(int destX, int destY) { // 缓慢滚动到指定位置 int scrollX = getScrollX(); int delta = destX - scrollX; System.out.println(偏移scrollX+scrollX); System.out.println(偏移差delta+delta); int a= Math.abs(delta) * 3; System.out.println(什么意思+a); mScroller.startScroll(scrollX, 0, delta, 0, Math.abs(delta) * 3); invalidate(); } @Override public void computeScroll() { if (mScroller.computeScrollOffset()) { System.out.println(当前x位置：+mScroller.getCurrX()); System.out.println(当前Y位置：+mScroller.getCurrY()); scrollTo(mScroller.getCurrX(), mScroller.getCurrY()); postInvalidate(); } } }
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