gpt4 book ai didi

Android编程实现ListView头部ViewPager广告轮询图效果

转载 作者:qq735679552 更新时间:2022-09-27 22:32:09 25 4
gpt4 key购买 nike

CFSDN坚持开源创造价值,我们致力于搭建一个资源共享平台,让每一个IT人在这里找到属于你的精彩世界.

这篇CFSDN的博客文章Android编程实现ListView头部ViewPager广告轮询图效果由作者收集整理,如果你对这篇文章有兴趣,记得点赞哟.

本文实例讲述了Android编程实现ListView头部ViewPager广告轮询图效果。分享给大家供大家参考,具体如下:

之前看了别人的一些软件,发现其广告图轮询的时候,那个广告感觉和ViewPager的效果不太一样,后来也查了一下,是因为时间问题,找了一些资料,自己也实践一下.

1、为了解决ListView头部加ViewPager滑动冲突问题,必须自定义ListView,重写里面的onInterceptTouchEvent方法,ListView代码如下:

?
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
package com.example.testa;
import android.content.Context;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.widget.ListView;
public class DefinedListView extends ListView {
  public DefinedListView(Context context) {
   super (context);
  }
  public DefinedListView(Context context, AttributeSet attrs) {
   super (context, attrs);
  }
  public DefinedListView(Context context, AttributeSet attrs, int defStyle) {
   super (context, attrs, defStyle);
  }
  private float xDistance, yDistance, xLast, yLast;
  @Override
  public boolean onInterceptTouchEvent(MotionEvent ev) {
   switch (ev.getAction()) {
    case MotionEvent.ACTION_DOWN:
     xDistance = yDistance = 0f;
     xLast = ev.getX();
     yLast = ev.getY();
     break ;
    case MotionEvent.ACTION_MOVE:
     final float curX = ev.getX();
     final float curY = ev.getY();
     xDistance += Math.abs(curX - xLast);
     yDistance += Math.abs(curY - yLast);
     xLast = curX;
     yLast = curY;
     if (xDistance > yDistance) {
      return false ;
     }
   }
   return super .onInterceptTouchEvent(ev);
  }
}

2、为了让广告轮询的速度减慢,必须重新设置ViewPager的Scroller,自定义的Scroller如下:

?
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
package com.example.testa;
import java.lang.reflect.Field;
import android.annotation.SuppressLint;
import android.content.Context;
import android.os.Handler;
import android.support.v4.app.FragmentActivity;
import android.support.v4.view.ViewPager;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnTouchListener;
import android.view.animation.Interpolator;
import android.widget.Scroller;
public class DefinedScroller extends Scroller {
  private int DURATION_TIME = 1000 ;
  private boolean shouldAutoScroll = true ;
  private ViewPager viewPager = null ;
  @SuppressLint ( "HandlerLeak" )
  private final Handler handler = new Handler() {
   public void handleMessage(android.os.Message msg) {
    if (shouldAutoScroll) {
     viewPager.setCurrentItem(viewPager.getCurrentItem() + 1 );
     handler.sendEmptyMessageDelayed( 0 , 2000 );
    }
   };
  };
  public DefinedScroller(Context context) {
   super (context);
  }
  public DefinedScroller(Context context, Interpolator interpolator) {
   super (context, interpolator);
  }
  private View initViewPager(Context context) {
   View view = LayoutInflater.from(context).inflate(R.layout.view_pager_layout, null );
   this .viewPager = (ViewPager) view.findViewById(R.id.viewpager);
   this .viewPager.setOffscreenPageLimit( 2 );
   this .viewPager.setAdapter( new MyFragmentPagerAdapter(((FragmentActivity) context).getSupportFragmentManager()));
   return view;
  }
  public ViewPager getViewPager() {
   return viewPager;
  }
  public View initView(Context context) {
   View view = initViewPager(context);
   this .viewPager.setOnTouchListener( new OnTouchListener() {
    @Override
    public boolean onTouch(View v, MotionEvent event) {
     if (event.getAction() == MotionEvent.ACTION_UP) {
      shouldAutoScroll = true ;
      handler.sendEmptyMessageDelayed( 0 , 2000 );
     } else {
      handler.removeMessages( 0 );
      shouldAutoScroll = false ;
     }
     return false ;
    }
   });
   try {
    Field mScroller = ViewPager. class .getDeclaredField( "mScroller" );
    mScroller.setAccessible( true );
    mScroller.set(viewPager, this );
   } catch (NoSuchFieldException e) {
   } catch (IllegalArgumentException e) {
   } catch (IllegalAccessException e) {
   }
   handler.sendEmptyMessageDelayed( 0 , 2000 );
   return view;
  }
  public void setShouldAutoScroll() {
   handler.removeMessages( 0 );
   if (viewPager.isShown()) {
    shouldAutoScroll = true ;
    handler.sendEmptyMessageDelayed( 0 , 2000 );
   } else {
    shouldAutoScroll = false ;
   }
  }
  @Override
  public void startScroll( int startX, int startY, int dx, int dy, int duration) {
   super .startScroll(startX, startY, dx, dy, shouldAutoScroll ? DURATION_TIME : duration);
  }
}

关键是startScroll方法啦 。

3、其他测试类, 。

(1)TestFragment:

?
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
package com.example.testa;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
public class TestFragment extends Fragment {
  public int imageResource = 0 ;
  public static TestFragment newInstance( int imageResource) {
   TestFragment newFragment = new TestFragment();
   newFragment.imageResource = imageResource;
   return newFragment;
  }
  @Override
  public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
   View view = inflater.inflate(R.layout.pager_layout, null );
   ImageView textView = (ImageView) view.findViewById(R.id.image);
   textView.setImageResource(imageResource);
   return view;
  }
}

(2)ViewPager的Adapter类:

?
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
package com.example.testa;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentStatePagerAdapter;
public class MyFragmentPagerAdapter extends FragmentStatePagerAdapter {
  public MyFragmentPagerAdapter(FragmentManager fm) {
   super (fm);
  }
  @Override
  public int getCount() {
   return Integer.MAX_VALUE;
  }
  @Override
  public Fragment getItem( int arg0) {
   switch (arg0 % 4 ) {
    case 0 :
     return TestFragment.newInstance(R.drawable.a1);
    case 1 :
     return TestFragment.newInstance(R.drawable.default_wh);
    case 2 :
     return TestFragment.newInstance(R.drawable.default_ww);
    case 3 :
     return TestFragment.newInstance(R.drawable.test);
    default :
     return TestFragment.newInstance(R.drawable.a1);
   }
  }
}

(3)测试的Activity:

?
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
package com.example.testa;
import java.util.ArrayList;
import java.util.List;
import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AbsListView;
import android.widget.AbsListView.OnScrollListener;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.BaseAdapter;
import android.widget.TextView;
public class MainActivity extends FragmentActivity {
  private DefinedListView listView = null ;
  private List<String> list = null ;
  private DefinedScroller definedScroller = null ;
  @Override
  protected void onCreate(Bundle savedInstanceState) {
   super .onCreate(savedInstanceState);
   setContentView(R.layout.activity_main);
   listView = (DefinedListView) findViewById(R.id.listview);
   initListData();
   initViewPager();
   listView.setAdapter( new ListAdapter());
   listView.setOnItemClickListener( new OnItemClickListener() {
    @Override
    public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
     definedScroller.getViewPager().setCurrentItem(definedScroller.getViewPager().getCurrentItem() + 1 );
    }
   });
   listView.setOnScrollListener( new OnScrollListener() {
    @Override
    public void onScrollStateChanged(AbsListView view, int scrollState) {
     if (scrollState == SCROLL_STATE_IDLE) {
      definedScroller.setShouldAutoScroll();
     }
    }
    @Override
    public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) {
    }
   });
  }
  private void initListData() {
   list = new ArrayList<String>();
   for ( int i = 1 ; i <= 20 ; ++i) {
    list.add( "test" + i);
   }
  }
  private void initViewPager() {
   definedScroller = new DefinedScroller( this );
   listView.addHeaderView(definedScroller.initView( this ));
  }
  private class ListAdapter extends BaseAdapter {
   @Override
   public int getCount() {
    return list.size();
   }
   @Override
   public Object getItem( int position) {
    return list.get(position);
   }
   @Override
   public long getItemId( int position) {
    return position;
   }
   @Override
   public View getView( int position, View convertView, ViewGroup parent) {
    TextView textView = (TextView) LayoutInflater.from(MainActivity. this ).inflate(R.layout.text_view_layout,
      null );
    textView.setPadding( 20 , 20 , 20 , 20 );
    textView.setText(list.get(position));
    return textView;
   }
  }
}

4、布局文件就算了吧 。

上面有些是在别的地方看到的,很久了,忘记在哪里看到的了,就写不上源地址了,敬请见谅.

希望本文所述对大家Android程序设计有所帮助.

最后此篇关于Android编程实现ListView头部ViewPager广告轮询图效果的文章就讲到这里了,如果你想了解更多关于Android编程实现ListView头部ViewPager广告轮询图效果的内容请搜索CFSDN的文章或继续浏览相关文章,希望大家以后支持我的博客! 。

25 4 0
Copyright 2021 - 2024 cfsdn All Rights Reserved 蜀ICP备2022000587号
广告合作:1813099741@qq.com 6ren.com