ViewPager+GridView实现横向滑动 仿大众点评

先看演示效果：

1  ViewPager类提供了多界面切换的新效果。

新效果有如下特征： 
[1] 当前显示一组界面中的其中一个界面。 
[2] 当用户通过左右滑动界面时，当前的屏幕显示当前界面和下一个界面的一部分。

[3]滑动结束后，界面自动跳转到当前选择的界面中

2 介绍里面几个比较重要的方法与接口

1,OnPageChangeListener  ViewPager页面进行切换监听接口  其中我们经常要实现public void onPageSelected(int arg0)，public void onPageScrolled(int arg0, float arg1, int arg2),public void onPageScrollStateChanged(int arg0)着三个方面，其中第一个方法是更多的用到;

2,setCurrentItem(int item),来设置跳转到当前的页面;

3,要显示ViewPager,当然还少不了PagerAdapter类，进行适配;其中我们经常也要实现以下方法才可以:public void destroyItem(View arg0, int arg1, Object arg2),public int getCount(),public Object instantiateItem(View arg0, int arg1),public boolean isViewFromObject(View arg0, Object arg1),具体的使用方法等会看例子就ok了

3 例子代码

java代码

package mm.shandong.com.testviewpagergrid;

import android.content.res.TypedArray;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.GridView;
import android.widget.ImageView;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.TextView;
import android.widget.Toast;

import java.util.ArrayList;
import java.util.List;

import mm.shandong.com.testviewpagergrid.entity.Catogray;

public class TestViewpagerGridActivity extends AppCompatActivity {
    ViewPager viewPagerHomeFragment;
    List<Catogray> catogarys;
    String[] catogary_names;
    int[] catogary_resourceIds;
    LayoutInflater layoutInflater;
    List<View> gridViews;
    RadioGroup radioGroup_index_fragment;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_test_viewpager_grid);
        catogary_names = getResources().getStringArray(R.array.catogary_names);
        TypedArray typedArray = getResources().obtainTypedArray(R.array.catogary_resourceIds);
        catogary_resourceIds = new int[typedArray.length()];
        for (int i = 0; i < typedArray.length(); i++) {
            catogary_resourceIds[i] = typedArray.getResourceId(i, 0);
        }

        catogarys = new ArrayList<Catogray>();
        viewPagerHomeFragment = (ViewPager) findViewById(R.id.viewPagerHomeFragment);
        layoutInflater = getLayoutInflater();
        radioGroup_index_fragment =
                 (RadioGroup) findViewById(R.id.radioGroup_index_fragment);
        for (int i = 0; i < catogary_names.length; i++) {
            Catogray catogary = new Catogray();
            catogary.setName(catogary_names[i]);
            catogary.setImage_source(catogary_resourceIds[i]);
            catogarys.add(catogary);
        }
        initViewPager();
    }

    public void initViewPager() {

        gridViews = new ArrayList<View>();
        ///定义第一个GridView
        GridView gridView1 =
                (GridView) layoutInflater.inflate(R.layout.grid_fragment_home, null);
        MyGridViewAdapter myGridViewAdapter1 = new MyGridViewAdapter(0, 8);
        gridView1.setAdapter(myGridViewAdapter1);
        ///定义第二个GridView
        GridView gridView2 = (GridView)
                layoutInflater.inflate(R.layout.grid_fragment_home, null);
        MyGridViewAdapter myGridViewAdapter2 = new MyGridViewAdapter(1, 8);
        gridView2.setAdapter(myGridViewAdapter2);
        ///定义第三个GridView
        GridView gridView3 = (GridView)
                layoutInflater.inflate(R.layout.grid_fragment_home, null);
        MyGridViewAdapter myGridViewAdapter3 = new MyGridViewAdapter(2, 8);
        gridView3.setAdapter(myGridViewAdapter3);
        gridViews.add(gridView1);
        gridViews.add(gridView2);
        gridViews.add(gridView3);

      ///定义viewpager的PagerAdapter
        viewPagerHomeFragment.setAdapter(new PagerAdapter() {
            @Override
            public boolean isViewFromObject(View arg0, Object arg1) {
                // TODO Auto-generated method stub
                return arg0 == arg1;
            }
            @Override
            public int getCount() {
                // TODO Auto-generated method stub
                return gridViews.size();
            }
            @Override
            public void destroyItem(ViewGroup container, int position,
                                    Object object) {
                // TODO Auto-generated method stub
                container.removeView(gridViews.get(position));
                //super.destroyItem(container, position, object);
            }
            @Override
            public Object instantiateItem(ViewGroup container, int position) {
                // TODO Auto-generated method stub
                container.addView(gridViews.get(position));
                return gridViews.get(position);
            }
        });
        ///注册viewPager页选择变化时的响应事件
        viewPagerHomeFragment.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {

            @Override
            public void onPageScrollStateChanged(int position) {
                // TODO Auto-generated method stub

            }

            @Override
            public void onPageScrolled(int arg0, float arg1, int arg2) {
                // TODO Auto-generated method stub

            }

            @Override
            public void onPageSelected(int position) {
                // TODO Auto-generated method stub
                RadioButton radioButton = (RadioButton)
                        radioGroup_index_fragment.getChildAt(position);
                radioButton.setChecked(true);
            }
        });
    }
    ///定影GridView的Adapter
    public class MyGridViewAdapter extends BaseAdapter {
        private int page;
        private int count;

        public MyGridViewAdapter(int page, int count) {
            this.page = page;
            this.count = count;
        }

        @Override
        public int getCount() {
            // TODO Auto-generated method stub
            return 8;
        }

        @Override
        public Catogray getItem(int position) {
            // TODO Auto-generated method stub
            return catogarys.get(page * count + position);
        }

        @Override
        public long getItemId(int position) {
            // TODO Auto-generated method stub
            return 0;
        }

        @Override
        public View getView(int position, View convertView, ViewGroup parent) {
            // TODO Auto-generated method stub
            ViewHolder viewHolder = null;
            final Catogray catogary = catogarys.get(page * count + position);
            if (convertView == null) {
                viewHolder = new ViewHolder();
                convertView = layoutInflater.inflate(R.layout.grid_fragment_home_item, null);
                viewHolder.grid_fragment_home_item_img =
                        (ImageView) convertView.findViewById(R.id.grid_fragment_home_item_img);
                viewHolder.grid_fragment_home_item_txt =
                        (TextView) convertView.findViewById(R.id.grid_fragment_home_item_txt);
                convertView.setTag(viewHolder);
            } else {
                viewHolder = (ViewHolder) convertView.getTag();
            }
            viewHolder.grid_fragment_home_item_img.setImageResource(catogary.getImage_source());
            viewHolder.grid_fragment_home_item_txt.setText(catogary.getName());
            viewHolder.grid_fragment_home_item_img.
                    setOnClickListener(new View.OnClickListener() {

                @Override
                public void onClick(View view) {
                    // TODO Auto-generated method stub
                    Toast.makeText(TestViewpagerGridActivity.this,
                            catogary.getName(), Toast.LENGTH_SHORT).show();
                }

            });
            return convertView;
        }

    }
    public class ViewHolder {
        public ImageView grid_fragment_home_item_img;
        public TextView grid_fragment_home_item_txt;
    }
}

　　

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