android仿照ipone的弹性效果_android 模仿ipone 设置提醒-优快云博客

本文介绍了一个自定义的Android ListView组件——BounceListView，该组件模仿了iOS的弹性滚动效果。通过调整最大滚动偏移距离实现跨平台一致的用户体验，并提供了一个简单的示例应用程序来展示其用法。

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android仿照ipone的弹性效果

 
          package 
          com.example.bounce;
         
          import 
          android.content.Context;
         
          import 
          android.util.AttributeSet;
         
          import 
          android.util.DisplayMetrics;
         
          import 
          android.widget.ListView;
         
          public 
          class 
          BounceListView 
          extends 
          ListView{
         
          private 
          static 
          final 
          int 
          MAX_Y_OVERSCROLL_DISTANCE = 
          200
          ;
         
          private 
          Context mContext;
         
          private 
          int 
          mMaxYOverscrollDistance;
         
          public 
          BounceListView(Context context){
         
          super
          (context);
         
          mContext = context;
         
          initBounceListView();
         
          }
         
          public 
          BounceListView(Context context, AttributeSet attrs){
         
          super
          (context, attrs);
         
          mContext = context;
         
          initBounceListView();
         
          }
         
          public 
          BounceListView(Context context, AttributeSet attrs, 
          int 
          defStyle){
         
          super
          (context, attrs, defStyle);
         
          mContext = context;
         
          initBounceListView();
         
          }
         
          private 
          void 
          initBounceListView(){
         
          //get the density of the screen and do some maths with it on the max overscroll distance
         
          //variable so that you get similar behaviors no matter what the screen size
         
          final 
          DisplayMetrics metrics = mContext.getResources().getDisplayMetrics();
         
          final 
          float 
          density = metrics.density;
         
          mMaxYOverscrollDistance = (
          int
          ) (density * MAX_Y_OVERSCROLL_DISTANCE);
         
          }
         
          @Override
         
          protected 
          boolean 
          overScrollBy(
          int 
          deltaX, 
          int 
          deltaY, 
          int 
          scrollX, 
          int 
          scrollY, 
          int 
          scrollRangeX, 
          int 
          scrollRangeY, 
          int 
          maxOverScrollX, 
          int 
          maxOverScrollY, 
          boolean 
          isTouchEvent){ 
         
          //This is where the magic happens, we have replaced the incoming maxOverScrollY with our own custom variable mMaxYOverscrollDistance; 
         
          return 
          super
          .overScrollBy(deltaX, deltaY, scrollX, scrollY, scrollRangeX, scrollRangeY, maxOverScrollX, mMaxYOverscrollDistance, isTouchEvent);  
         
          }
         
          }

 
          package 
          com.example.bounce;
         
          import 
          java.util.ArrayList;
         
          import 
          java.util.List;
         
          import 
          android.app.Activity;
         
          import 
          android.os.Bundle;
         
          import 
          android.widget.ArrayAdapter;
         
          public 
          class 
          BounceListViewActivity 
          extends 
          Activity {
         
          /** Called when the activity is first created. */
         
          @Override
         
          public 
          void 
          onCreate(Bundle savedInstanceState) {
         
          super
          .onCreate(savedInstanceState);
         
          setContentView(R.layout.activity_bounce_list_view);
         
          BounceListView mBounceLv = (BounceListView)findViewById(R.id.list);
         
          mBounceLv.setAdapter(
          new 
          ArrayAdapter<String>(
          this
          ,android.R.layout.simple_list_item_1,getData()));
         
          }
         
          private 
          List<String> getData(){
         
          List<String> data = 
          new 
          ArrayList<String>();
         
          data.add(
          "测试数据1"
          );
         
          data.add(
          "测试数据2"
          );
         
          data.add(
          "测试数据3"
          );
         
          data.add(
          "测试数据4"
          );
         
          data.add(
          "测试数据5"
          );
         
          data.add(
          "测试数据6"
          );
         
          data.add(
          "测试数据7"
          );
         
          data.add(
          "测试数据8"
          );
         
          data.add(
          "测试数据9"
          );
         
          data.add(
          "测试数据10"
          );
         
          data.add(
          "测试数据11"
          );
         
          data.add(
          "测试数据12"
          );
         
          data.add(
          "测试数据13"
          );
         
          return 
          data;
         
          }
         
          }