[置顶] Android自定义组件系列【15】――四个方向滑动的菜单实现

@Override protected void onLayout(boolean changed, int l, int t, int r, int b) { mTopView.layout(0, -mViewHeight, mViewWidth, 0); mBottomView.layout(0, mViewHeight, mViewWidth, 2 * mViewHeight); mCenterView.layout(0, 0, mViewWidth, mViewHeight); mLeftView.layout(-mViewWidth, 0, 0, mViewHeight); mRightView.layout(mViewWidth, 0, 2 * mViewWidth, mViewHeight); }

private float mDownY; private float mDownX; @Override public boolean onTouchEvent(MotionEvent event) { int disY; int disX; float eventY = event.getY(); float eventX = event.getX(); switch (event.getAction()) { case MotionEvent.ACTION_DOWN: mDownY = eventY; mDownX = eventX; break; case MotionEvent.ACTION_UP: disY = (int)(eventY - mDownY); disX = (int)(eventX - mDownX); if(Math.abs(disY) > Math.abs(disX)){ if(Math.abs(disY) > MIN_VIEW_HEIGHT / 2){ if(disY > 0){ //向下滑动 Log.d(TAG, "TO_BOTTOM"); changeToBottom(); }else{ //向上滑动 Log.d(TAG, "TO_TOP"); changeToTop(); } } }else{ if(Math.abs(disX) > MIN_VIEW_WIDTH / 2){ if(disX > 0){ //向右滑动 Log.d(TAG, "TO_RIGHT"); changeToRight(); }else{ //向左滑动 Log.d(TAG, "TO_LEFT"); changeToLeft(); } } } break; default: break; } return true; }

@Override public void computeScroll() { super.computeScroll(); if(mScroller.computeScrollOffset()){ scrollTo(mScroller.getCurrX(), mScroller.getCurrY()); postInvalidate(); } }

int[] location = new int[2]; mCenterView.getLocationOnScreen(location); if(location[1] >= mViewHeight - MIN_VIEW_HEIGHT * 2) return;

package com.example.testmx4update; import android.content.Context; import android.graphics.Color; import android.util.AttributeSet; import android.util.Log; import android.view.MotionEvent; import android.view.View; import android.view.ViewGroup; import android.widget.Scroller; /** * 自定义可以拖动的View * @author 阳光小强 http://blog.csdn.net/dawanganban * */ public class MyCanPullView extends ViewGroup{ private static final int MIN_VIEW_HEIGHT = 200; private static final int MIN_VIEW_WIDTH = 400; private static final String TAG = "TEST"; private int mViewHeight; private int mViewWidth; private View mTopView; private View mBottomView; private View mCenterView; private View mLeftView; private View mRightView; private Scroller mScroller; public MyCanPullView(Context context, AttributeSet attrs) { super(context, attrs); initView(context); mScroller = new Scroller(context); } private void initView(Context context) { setTopView(context); setBottomView(context); setCenterView(context); setLeftView(context); setRightView(context); } private float mDownY; private float mDownX; @Override public boolean onTouchEvent(MotionEvent event) { int disY; int disX; float eventY = event.getY(); float eventX = event.getX(); switch (event.getAction()) { case MotionEvent.ACTION_DOWN: mDownY = eventY; mDownX = eventX; break; case MotionEvent.ACTION_UP: disY = (int)(eventY - mDownY); disX = (int)(eventX - mDownX); if(Math.abs(disY) > Math.abs(disX)){ if(Math.abs(disY) > MIN_VIEW_HEIGHT / 2){ if(disY > 0){ //向下滑动 Log.d(TAG, "TO_BOTTOM"); changeToBottom(); }else{ //向上滑动 Log.d(TAG, "TO_TOP"); changeToTop(); } } }else{ if(Math.abs(disX) > MIN_VIEW_WIDTH / 2){ if(disX > 0){ //向右滑动 Log.d(TAG, "TO_RIGHT"); changeToRight(); }else{ //向左滑动 Log.d(TAG, "TO_LEFT"); changeToLeft(); } } } break; default: break; } return true; } private void changeToBottom(){ int[] location = new int[2]; mCenterView.getLocationOnScreen(location); if(location[1] >= mViewHeight - MIN_VIEW_HEIGHT * 2) return; int dy = (int)(mViewHeight - MIN_VIEW_HEIGHT); mScroller.startScroll(0, getScrollY(), 0, -dy, 500); invalidate(); } private void changeToTop(){ int[] location = new int[2]; mTopView.getLocationOnScreen(location); if(location[1] <= -mViewHeight - MIN_VIEW_HEIGHT / 2) return; int dy = (int)(mViewHeight - MIN_VIEW_HEIGHT); mScroller.startScroll(0, getScrollY(), 0, dy, 500); invalidate(); } private void changeToRight(){ int[] location = new int[2]; mCenterView.getLocationOnScreen(location); if(location[0] >= mViewWidth - MIN_VIEW_WIDTH * 2) return; int dx = (int)(mViewWidth - MIN_VIEW_WIDTH); mScroller.startScroll(getScrollX(), 0, -dx, 0, 500); invalidate(); } private void changeToLeft(){ Log.d(TAG, "TO_LEFT"); int[] location = new int[2]; mLeftView.getLocationOnScreen(location); if(location[0] <= -mViewWidth - MIN_VIEW_WIDTH / 2) return; int dx = (int)(mViewWidth - MIN_VIEW_WIDTH); mScroller.startScroll(getScrollX(), 0, dx, 0, 500); invalidate(); } @Override public void computeScroll() { super.computeScroll(); if(mScroller.computeScrollOffset()){ scrollTo(mScroller.getCurrX(), mScroller.getCurrY()); postInvalidate(); } } @Override protected void onLayout(boolean changed, int l, int t, int r, int b) { mTopView.layout(0, -mViewHeight, mViewWidth, 0); mBottomView.layout(0, mViewHeight, mViewWidth, 2 * mViewHeight); mCenterView.layout(0, 0, mViewWidth, mViewHeight); mLeftView.layout(-mViewWidth, 0, 0, mViewHeight); mRightView.layout(mViewWidth, 0, 2 * mViewWidth, mViewHeight); } @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { super.onMeasure(widthMeasureSpec, heightMeasureSpec); //获得全部View的宽高 mViewWidth = MeasureSpec.getSize(widthMeasureSpec); mViewHeight = MeasureSpec.getSize(heightMeasureSpec); } private void setTopView(Context context){ View topButton = new View(context); topButton.setBackgroundColor(Color.RED); mTopView = topButton; this.addView(mTopView); } private void setBottomView(Context context){ View bottomButton = new View(context); bottomButton.setBackgroundColor(Color.GREEN); mBottomView = bottomButton; this.addView(mBottomView); } private void setCenterView(Context context){ View centerButton = new View(context); centerButton.setBackgroundColor(Color.WHITE); mCenterView = centerButton; this.addView(mCenterView); } private void setLeftView(Context context){ View leftButton = new View(context); leftButton.setBackgroundColor(Color.BLUE); mLeftView = leftButton; this.addView(mLeftView); } private void setRightView(Context context){ View rightButton = new View(context); rightButton.setBackgroundColor(Color.YELLOW); mRightView = rightButton; this.addView(mRightView); } }