/********************SpriteLayout.java**********************************/
package com.example.game;
import android.content.Context;import android.graphics.Color;import android.util.AttributeSet;import android.util.Log;import android.view.MotionEvent;import android.view.VelocityTracker;import android.view.View;import android.view.ViewConfiguration;import android.view.ViewGroup;import android.view.View.MeasureSpec;import android.widget.FrameLayout;import android.widget.LinearLayout;import android.widget.RelativeLayout;import android.widget.Scroller;import android.widget.Toast;
public class SpriteLayout extends ViewGroup { private float startX; private int curL=1; private int destL; VelocityTracker velocity=null; @Override public void computeScroll() { super.computeScroll(); if(mScroller.computeScrollOffset()){ scrollTo(mScroller.getCurrX(), 0); postInvalidate(); } } public void startMove(){ //从开(startX,startY)点开始滑动到(startX+deltaX,startY+deltaY)点，如果终点在起点的左边或这下边，便会向左或向下滑动，如果在邮编或者上边便会向右或向上滑动 //起点和终点都是以view的左上角的坐标 mScroller.startScroll((curL-1)*getWidth(), 0, getWidth(), 0,3000); curL++; if(curL>=3) curL=1; invalidate(); } private Scroller mScroller; private float minDist; private void init(){ mScroller=new Scroller(getContext()); LinearLayout l1=new LinearLayout(getContext()); l1.setBackgroundColor(Color.BLUE); LinearLayout l2=new LinearLayout(getContext()); l2.setBackgroundColor(Color.CYAN); LinearLayout l3=new LinearLayout(getContext()); l3.setBackgroundColor(Color.RED); this.addView(l1); this.addView(l2); this.addView(l3); minDist=ViewConfiguration.get(getContext()).getScaledEdgeSlop(); } public SpriteLayout(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); // TODO Auto-generated constructor stub init(); }
public SpriteLayout(Context context, AttributeSet attrs) { super(context, attrs); // TODO Auto-generated constructor stub init(); }
@Override public boolean onInterceptTouchEvent(MotionEvent ev) { // TODO Auto-generated method stub return true; }
@Override public boolean onTouchEvent(MotionEvent event) { // TODO Auto-generated method stub //Toast.makeText(getContext(), "SpriteLayout touchevent"+event.getAction()+"return:"+super.onTouchEvent(event), Toast.LENGTH_SHORT).show(); if(velocity==null){ velocity = VelocityTracker.obtain(); } velocity.addMovement(event); switch(event.getAction()) { case MotionEvent.ACTION_DOWN: startX=event.getX(); break; case MotionEvent.ACTION_MOVE: int delta=(int)(startX-event.getX()); scrollBy(delta, 0); startX=event.getX(); break; case MotionEvent.ACTION_UP: //如果手指从左向右滑动velocity.getXVelocity()返回正数 //如果手指从右向左滑动velocity.getXVelocity()返回负数 velocity.computeCurrentVelocity(1000);//一秒钟划过多少个像素，原本的基本单位是一毫秒划过多少个像素
//getScrollX()就是viewgroup的左上角对应的视图的X坐标，当滑动的距离超过半屏的距离就当滑到下一屏，否则就是滑到当前屏 int dest=(getScrollX()+getWidth()/2)/getWidth(); //显示第N屏 scrollTo((N-1)*getWidth(),0) startScroll(getScrollX(),0,(N-1)*getWidth()-getScrollX(),0) if(dest>getChildCount()-1){ dest=getChildCount()-1;//滑到最后一个view 最后显示到viewgroup的左上角的X坐标为 （getChildCount()-1）*getWidth()而不是（getChildCount()）*getWidth() } mScroller.startScroll(getScrollX(),0,(int) (dest*getWidth()-getScrollX()),0); invalidate(); curL=dest; break; default: break; }
return true; }
public SpriteLayout(Context context) { super(context); // TODO Auto-generated constructor stub init(); }
// measure过程 @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
// 设置该ViewGroup的大小 int width = MeasureSpec.getSize(widthMeasureSpec); int height = MeasureSpec.getSize(heightMeasureSpec); setMeasuredDimension(width, height);
int childCount = getChildCount();
for (int i = 0; i < childCount; i++) { View child = getChildAt(i); // 设置每个子视图的大小 ， 即全屏 child.measure(getWidth(), getHeight()); } }
// layout过程 @Override protected void onLayout(boolean changed, int l, int t, int r, int b) { int startLeft = 0; // 每个子视图的起始布局坐标 int startTop = 0; // 间距设置为10px 相当于 android：marginTop= "10px" int childCount = getChildCount(); for (int i = 0; i < childCount; i++) { View child = getChildAt(i); //即使可见的，才划到屏幕上 if(child.getVisibility() != View.GONE) //左上角的X,Y 右下角的X,Y child.layout(startLeft, startTop, startLeft + getWidth(), startTop + getHeight() ); startLeft = startLeft + getWidth() ; //校准每个子View的起始布局位置 //三个子视图的在屏幕中的分布如下 [0 , 320] / [320,640] / [640,960] } }}
/********************SpriteB.java**********************************/
package com.example.game;
import android.content.Context;import android.util.AttributeSet;import android.view.MotionEvent;import android.widget.Button;import android.widget.Toast;
public class SpriteB extends Button {
@Override public void computeScroll() { // TODO Auto-generated method stub super.computeScroll(); }
public SpriteB(Context context) { super(context); // TODO Auto-generated constructor stub }
public SpriteB(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); // TODO Auto-generated constructor stub }
public SpriteB(Context context, AttributeSet attrs) { super(context, attrs); // TODO Auto-generated constructor stub }
}
/********************SpriteActivity.java**********************************/
package com.example.game;
import android.app.Activity;import android.os.Bundle;import android.view.View;import android.view.View.OnClickListener;
public class SpriteActivity extends Activity { SpriteB sprite; SpriteLayout layout; @Override protected void onCreate(Bundle savedInstanceState) { // TODO Auto-generated method stub super.onCreate(savedInstanceState); setContentView(R.layout.main); sprite=(SpriteB) findViewById(R.id.btn); layout=(SpriteLayout) findViewById(R.id.layout); sprite.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { layout.startMove(); } }); }
}
/********************main.xml**********************************/
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" > <com.example.game.SpriteB android:id="@+id/btn" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="this is a sprite button!"/> <com.example.game.SpriteLayout android:id="@+id/layout" android:layout_width="match_parent" android:layout_height="match_parent"/></LinearLayout>
转载于:https://www.cnblogs.com/xushihai/p/4199480.html
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