Android编程实现ListView头部ViewPager广告轮询图效果

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);  } }

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);  } }

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;  } }

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);   }  } }

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;   }  } }