Android编程实现ListView头部ViewPager广告轮询图效果

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：

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：

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：

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：

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：

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。