Android基础：ListView + ViewPager ( 三 )

自定义类MyViewPager,并把MyViewPager作为listview的HeadView使用

解决viewpager滑动的问题

1 效果图：

2 布局：activity_main.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    tools:context=".MainActivity" >    <ListView        android:id="@+id/listView"        android:layout_width="match_parent"        android:layout_height="match_parent" >    </ListView></RelativeLayout>

3 代码：MainActivity.java + MyViewPager.java

3-1 MyViewPager.java

package com.cqc.listview_viewpager03;import android.content.Context;import android.support.v4.view.ViewPager;import android.view.MotionEvent;public class MyViewPager extends ViewPager {    public MyViewPager(Context context) {        super(context);    }    //让父控件不拦截事件，直接传递给viewpager做处理    @Override    public boolean dispatchTouchEvent(MotionEvent ev) {        requestDisallowInterceptTouchEvent(true);//      getParent().requestDisallowInterceptTouchEvent(true);        return super.dispatchTouchEvent(ev);    }}

3-2 MainActivity.java

package com.cqc.listview_viewpager03;import java.util.ArrayList;import java.util.List;import android.os.Bundle;import android.app.Activity;import android.content.Context;import android.support.v4.view.PagerAdapter;import android.support.v4.view.ViewPager;import android.support.v4.view.ViewPager.OnPageChangeListener;import android.view.Menu;import android.view.View;import android.view.ViewGroup;import android.widget.AbsListView;import android.widget.AdapterView;import android.widget.BaseAdapter;import android.widget.ImageView;import android.widget.ListView;import android.widget.TextView;import android.widget.Toast;import android.widget.AdapterView.OnItemClickListener;/** * 代码：将MyViewPager作为ListView的头布局显示，并让其父控件不拦截事件 * 缺点：无法刷新 * @author cui * */public class MainActivity extends Activity {    private MyViewPager viewpager;    private ListView listView;    private List<ImageView> imageList = new ArrayList<ImageView>();    private List<String> lvList = new ArrayList<String>();    private Context context = MainActivity.this;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        listView = (ListView) findViewById(R.id.listView);        //当然我们也可以把自定义的MyViewPager放在布局中引用，这样就不用listView.addHeaderView(viewpager);        //但是这根原生的viewpager就没区别了。        viewpager = new  MyViewPager(context);        //错误，原因：ViewPager.LayoutParams无法转换成AbsListView.LayoutParams//      ViewPager.LayoutParams params = new ViewPager.LayoutParams();//      params.width = ViewPager.LayoutParams.MATCH_PARENT;//      params.height = 200;        AbsListView.LayoutParams params = new AbsListView.LayoutParams(AbsListView.LayoutParams.MATCH_PARENT, 500);        viewpager.setLayoutParams(params);        initListViewData();        initViewPagerData();        initViewPager();        initListView();    }    private void initListView() {        listView.addHeaderView(viewpager);        MyLvAdapter adapter = new MyLvAdapter();        listView.setAdapter(adapter);        listView.setOnItemClickListener(new OnItemClickListener() {            @Override            public void onItemClick(AdapterView<?> parent, View view,                    int position, long id) {                Toast.makeText(MainActivity.this, "ListView--" + position,                        Toast.LENGTH_SHORT).show();            }        });    }    private void initListViewData() {        lvList.clear();        for (int i = 0; i < 100; i++) {            lvList.add("item--" + i);        }    }    class MyLvAdapter extends BaseAdapter {        @Override        public int getCount() {            return lvList.size();        }        @Override        public Object getItem(int position) {            return lvList.get(position);        }        @Override        public long getItemId(int position) {            return position;        }        @Override        public View getView(int position, View convertView, ViewGroup parent) {            TextView tv = new TextView(MainActivity.this);            tv.setText(lvList.get(position));            tv.setTextSize(30);            return tv;        }    }    private void initViewPagerData() {        imageList.clear();        ImageView iv1 = new ImageView(this);        iv1.setBackgroundResource(R.drawable.a);        ImageView iv2 = new ImageView(this);        iv2.setBackgroundResource(R.drawable.b);        ImageView iv3 = new ImageView(this);        iv3.setBackgroundResource(R.drawable.c);        ImageView iv4 = new ImageView(this);        iv4.setBackgroundResource(R.drawable.d);        imageList.add(iv1);        imageList.add(iv2);        imageList.add(iv3);        imageList.add(iv4);    }    private void initViewPager() {        MyPagerAdapter adapter = new MyPagerAdapter();        viewpager.setAdapter(adapter);        viewpager.setOnPageChangeListener(new OnPageChangeListener() {            @Override            public void onPageSelected(int position) {                Toast.makeText(MainActivity.this, "viewpager--" + position,                        Toast.LENGTH_SHORT).show();            }            @Override            public void onPageScrolled(int position, float positionOffset,                    int positionOffsetPixels) {            }            @Override            public void onPageScrollStateChanged(int state) {            }        });    }    class MyPagerAdapter extends PagerAdapter {        @Override        public int getCount() {            return imageList.size();        }        @Override        public boolean isViewFromObject(View view, Object object) {            return view == object;        }        @Override        public Object instantiateItem(ViewGroup container, int position) {            container.addView(imageList.get(position));            return imageList.get(position);        }        @Override        public void destroyItem(ViewGroup container, int position, Object object) {            container.removeView((View) object);        }    }}

4 缺点：

使用的是原生的listview，无法刷新，所以我们引用第三方的库PulltoRresh.
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