Android重写HorizontalScrollView模仿ViewPager效果

Android提供的ViewPager类太复杂，有时候没有必要使用，所以重写一个HorizontalScrollView来实现类似的效果，也可以当做Gallery来用

思路很简单，就是重写onTouchEvent事件，在手指抬起或者取消的时候，进行smoothScroll的操作，具体请看代码：

布局文件：activity_test.xml

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1 <!--?xml version=1.0 encoding=utf-8?-->  2 <com.example.testxinye.myscrollview 3="" 4="" 5="" 6="" android:layout_height="fill_parent" android:layout_width="fill_parent" xmlns:android="http://schemas.android.com/apk/res/android">  7     <linearlayout 10="" 11="" 8="" 9="" android:id="@+id/container" android:layout_height="match_parent" android:layout_width="match_parent" android:orientation="horizontal"> 12         13     </linearlayout> 14 </com.example.testxinye.myscrollview>

Activity类：TestActivity.java

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1 package com.example.testxinye;  2  3 import android.app.Activity;  4 import android.graphics.Color;  5 import android.os.Bundle;  6 import android.util.DisplayMetrics;  7 import android.widget.ImageView;  8 import android.widget.ImageView.ScaleType;  9 import android.widget.LinearLayout; 10 import android.widget.LinearLayout.LayoutParams; 11 /** 12  * 13  * @author xinye 14  * 15  */ 16 public class TestActivity extends Activity { 17     private LinearLayout mContainer = null; 18     @Override 19     protected void onCreate(Bundle savedInstanceState) { 20         // TODO Auto-generated method stub 21         super.onCreate(savedInstanceState); 22         setContentView(R.layout.activity_test); 23         24         mContainer = (LinearLayout) findViewById(R.id.container); 25         26         LayoutParams params = new LayoutParams(getWinWidth(), getWinHeight()); 27         28         ImageView imageView1 = new ImageView(this); 29         imageView1.setLayoutParams(params); 30         imageView1.setImageResource(R.drawable.call_show_medal5); 31         imageView1.setScaleType(ScaleType.CENTER); 32         mContainer.addView(imageView1); 33         34         ImageView imageView2 = new ImageView(this); 35         imageView2.setLayoutParams(params); 36         imageView2.setImageResource(R.drawable.call_show_medal1); 37         imageView2.setScaleType(ScaleType.CENTER); 38         imageView2.setBackgroundColor(Color.RED); 39         mContainer.addView(imageView2); 40         41         ImageView imageView3 = new ImageView(this); 42         imageView3.setLayoutParams(params); 43         imageView3.setImageResource(R.drawable.call_show_medal2); 44         imageView3.setScaleType(ScaleType.CENTER); 45         imageView3.setBackgroundColor(Color.GRAY); 46         mContainer.addView(imageView3); 47         48         49         ImageView imageView4 = new ImageView(this); 50         imageView4.setLayoutParams(params); 51         imageView4.setImageResource(R.drawable.call_show_medal3); 52         imageView4.setScaleType(ScaleType.CENTER); 53         imageView4.setBackgroundColor(Color.BLUE); 54         mContainer.addView(imageView4); 55         56         57         ImageView imageView5 = new ImageView(this); 58         imageView5.setLayoutParams(params); 59         imageView5.setImageResource(R.drawable.call_show_medal4); 60         imageView5.setScaleType(ScaleType.CENTER); 61         imageView5.setBackgroundColor(Color.GREEN); 62         mContainer.addView(imageView5); 63         64         65         66     } 67     68     @Override 69     protected void onResume() { 70 //        ((MyScrollView)mContainer.getParent()).init(); 71         super.onResume(); 72     } 73     74     private int getWinWidth(){ 75         DisplayMetrics dm = new DisplayMetrics(); 76         //获取屏幕信息 77         getWindowManager().getDefaultDisplay().getMetrics(dm); 78         return dm.widthPixels; 79     } 80     private int getWinHeight(){ 81         DisplayMetrics dm = new DisplayMetrics(); 82         //获取屏幕信息 83         getWindowManager().getDefaultDisplay().getMetrics(dm); 84         return dm.heightPixels; 85     } 86 }

重写的HorizontalScrollView：MyScrollView.java

1 package com.example.testxinye;

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2   3 import java.util.ArrayList;   4   5 import android.content.Context;   6 import android.util.AttributeSet;   7 import android.view.MotionEvent;   8 import android.view.View;   9 import android.view.ViewGroup;  10 import android.widget.HorizontalScrollView;  11 /**  12  *  13  * @author XINYE  14  *  15  */  16 public class MyScrollView extends HorizontalScrollView {  17     private int subChildCount = 0;  18     private ViewGroup firstChild = null;  19     private int downX = 0;  20     private int currentPage = 0;  21     private ArrayList<integer> pointList = new ArrayList<integer>();  22      23     public MyScrollView(Context context, AttributeSet attrs, int defStyle) {  24         super(context, attrs, defStyle);  25         init();  26     }  27  28  29     public MyScrollView(Context context, AttributeSet attrs) {  30         super(context, attrs);  31         init();  32     }  33  34     public MyScrollView(Context context) {  35         super(context);  36         init();  37     }  38     private void init() {  39         setHorizontalScrollBarEnabled(false);  40     }  41     @Override  42     protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {  43         super.onMeasure(widthMeasureSpec, heightMeasureSpec);  44         receiveChildInfo();  45     }  46     public void receiveChildInfo() {  47          48         firstChild = (ViewGroup) getChildAt(0);  49         if(firstChild != null){  50             subChildCount = firstChild.getChildCount();  51             for(int i = 0;i < subChildCount;i++){  52                 if(((View)firstChild.getChildAt(i)).getWidth() > 0){  53                     pointList.add(((View)firstChild.getChildAt(i)).getLeft());  54                 }  55             }  56         }  57  58     }  59     @Override  60     public boolean onTouchEvent(MotionEvent ev) {  61         switch (ev.getAction()) {  62         case MotionEvent.ACTION_DOWN:  63             downX = (int) ev.getX();  64             break;  65         case MotionEvent.ACTION_MOVE:{  66              67         }break;  68         case MotionEvent.ACTION_UP:  69         case MotionEvent.ACTION_CANCEL:{  70             if( Math.abs((ev.getX() - downX)) > getWidth() / 4){  71                 if(ev.getX() - downX > 0){  72                     smoothScrollToPrePage();  73                 }else{  74                     smoothScrollToNextPage();  75                 }  76             }else{             77                 smoothScrollToCurrent();  78             }  79             return true;  80         }  81         }  82         return super.onTouchEvent(ev);  83     }  84  85     private void smoothScrollToCurrent() {  86         smoothScrollTo(pointList.get(currentPage), 0);  87     }  88  89     private void smoothScrollToNextPage() {  90         if(currentPage < subChildCount - 1){  91             currentPage++;  92             smoothScrollTo(pointList.get(currentPage), 0);  93         }  94     }  95  96     private void smoothScrollToPrePage() {  97         if(currentPage > 0){             98             currentPage--;  99             smoothScrollTo(pointList.get(currentPage), 0); 100         } 101     } 102     /** 103      * 下一页 104      */ 105     public void nextPage(){ 106         smoothScrollToNextPage(); 107     } 108     /** 109      * 上一页 110      */ 111     public void prePage(){ 112         smoothScrollToPrePage(); 113     } 114     /** 115      * 跳转到指定的页面 116      * @param page 117      * @return 118      */ 119     public boolean gotoPage(int page){ 120         if(page > 0 && page < subChildCount - 1){ 121             smoothScrollTo(pointList.get(page), 0); 122             currentPage = page; 123             return true; 124         } 125         return false; 126     } 127 }</integer></integer>

 

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