Android 利用ViewPager+GridView實現首頁導航欄布局分頁效果

2019-10-23 20:08:51

字體：大中小

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最近我嘗試使用ViewPager+GridView實現的，看起來一切正常，廢話不多說，具體代碼如下：

如圖是效果圖

viewpager,頭部導航欄,viewpager加gridview,viewpager頂部導航欄

首先分析下思路

1.首先是怎么布局：整體是一個ViewPager將GridView作為一個View添加到ViewPager的adapter中，下方是圓點

<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"  android:layout_width="match_parent"  android:layout_height="match_parent"  android:background="#CDCDCD" >  <RelativeLayout    android:layout_width="match_parent"    android:layout_height="200dp"    android:background="#fff" >    <android.support.v4.view.ViewPager      android:id="@+id/viewpager"      android:layout_width="match_parent"      android:layout_height="wrap_content" />    <LinearLayout      android:id="@+id/points"      android:layout_width="match_parent"      android:layout_height="wrap_content"      android:layout_alignParentBottom="true"      android:layout_marginBottom="10dp"      android:gravity="center"      android:orientation="horizontal" />  </RelativeLayout></RelativeLayout>

2.接下來時作為ViewPager的item布局文件GridView，（如果最外層是RelativeLayout或線型布局等，會轉換異常）

<?xml version="1.0" encoding="utf-8"?><GridView xmlns:android="http://schemas.android.com/apk/res/android"  android:id="@+id/gridView"  android:layout_width="match_parent"  android:layout_height="wrap_content"  android:numColumns="4"></GridView>

3.是GridView適配器的編寫，主要是注意數量如果一共有all=10條數據，每頁最多max=8條的話，第一個頁面就是個數是max=8，第二個就2個all-max

package com.item.jiejie.adapter;import java.util.List;import com.item.jiejie.ProdctBean;import com.item.jiejie.R;import android.content.Context;import android.view.View;import android.view.ViewGroup;import android.widget.BaseAdapter;import android.widget.ImageView;import android.widget.TextView;import android.widget.Toast;/** * GridView加載數據的適配器 * @author Administrator * */public class MyGridViewAdpter extends BaseAdapter{    private Context context;  private List<ProdctBean> lists;//數據源  private int mIndex; // 頁數下標，標示第幾頁，從0開始  private int mPargerSize;// 每頁顯示的最大的數量        public MyGridViewAdpter(Context context, List<ProdctBean> lists,      int mIndex, int mPargerSize) {    this.context = context;    this.lists = lists;    this.mIndex = mIndex;    this.mPargerSize = mPargerSize;  }  /**   * 先判斷數據及的大小是否顯示滿本頁lists.size() > (mIndex + 1)*mPagerSize   * 如果滿足，則此頁就顯示最大數量lists的個數   * 如果不夠顯示每頁的最大數量，那么剩下幾個就顯示幾個   */  @Override  public int getCount() {    // TODO Auto-generated method stub    return lists.size() > (mIndex + 1) * mPargerSize ?         mPargerSize : (lists.size() - mIndex*mPargerSize);  }  @Override  public ProdctBean getItem(int arg0) {    // TODO Auto-generated method stub    return lists.get(arg0 + mIndex * mPargerSize);  }  @Override  public long getItemId(int arg0) {    // TODO Auto-generated method stub    return arg0 + mIndex * mPargerSize;  }  @Override  public View getView(int position, View convertView, ViewGroup parent) {    // TODO Auto-generated method stub    ViewHolder holder = null;    if(convertView == null){      holder = new ViewHolder();      convertView = View.inflate(context, R.layout.item_view, null);      holder.tv_name = (TextView)convertView.findViewById(R.id.item_name);      holder.iv_nul = (ImageView)convertView.findViewById(R.id.item_image);      convertView.setTag(holder);    }else {      holder = (ViewHolder)convertView.getTag();    }    //重新確定position因為拿到的總是數據源，數據源是分頁加載到每頁的GridView上的    final int pos = position + mIndex * mPargerSize;//假設mPageSiez    //假設mPagerSize=8，假如點擊的是第二頁（即mIndex=1）上的第二個位置item(position=1),那么這個item的實際位置就是pos=9    holder.tv_name.setText(lists.get(pos).getName() + "");    holder.iv_nul.setImageResource(lists.get(pos).getUrl());    //添加item監聽//    convertView.setOnClickListener(new View.OnClickListener() {//      //      @Override//      public void onClick(View arg0) {//        // TODO Auto-generated method stub//        Toast.makeText(context, "您點擊了" + lists.get(pos).getName(), Toast.LENGTH_SHORT).show();//      }//    });    return convertView;  }  static class ViewHolder{    private TextView tv_name;    private ImageView iv_nul;  }}

4.GridView的點擊事件這里提供2種方法一種是在適配器用布局的點擊事件來處理；第二種是Object obj = gridView.getItemAtPosition(position);來處理。

5.主程序將GridView作為View添加到ViewPager中代碼如下

package com.item.jiejie;import java.util.ArrayList;import java.util.List;import com.item.jiejie.adapter.MyGridViewAdpter;import com.item.jiejie.adapter.MyViewPagerAdapter;import android.app.Activity;import android.os.Bundle;import android.support.v4.view.ViewPager;import android.view.View;import android.widget.AdapterView;import android.widget.AdapterView.OnItemClickListener;import android.widget.GridView;import android.widget.ImageView;import android.widget.LinearLayout;import android.widget.Toast;/** * 實現仿美團首頁導航欄布局分頁效果  * @author Administrator * */public class MyActivity extends Activity {  private ViewPager viewPager;  private LinearLayout group;//圓點指示器  private ImageView[] ivPoints;//小圓點圖片的集合  private int totalPage; //總的頁數  private int mPageSize = 8; //每頁顯示的最大的數量  private List<ProdctBean> listDatas;//總的數據源  private List<View> viewPagerList;//GridView作為一個View對象添加到ViewPager集合中  //private int currentPage;//當前頁    private String[] proName = {"名稱0","名稱1","名稱2","名稱3","名稱4","名稱5",      "名稱6","名稱7","名稱8","名稱9","名稱10","名稱11","名稱12","名稱13",      "名稱14","名稱15","名稱16","名稱17","名稱18","名稱19"};  @Override  protected void onCreate(Bundle savedInstanceState) {    // TODO Auto-generated method stub    super.onCreate(savedInstanceState);    setContentView(R.layout.activity_my);    //初始化控件    initView();    //添加業務邏輯    initData();  }    private void initView() {    // TODO Auto-generated method stub    viewPager = (ViewPager)findViewById(R.id.viewpager);    group = (LinearLayout)findViewById(R.id.points);    listDatas = new ArrayList<ProdctBean>();    for(int i =0 ; i < proName.length; i++){      listDatas.add(new ProdctBean(proName[i], R.drawable.iv_driving));    }  }  private void initData() {    // TODO Auto-generated method stub    //總的頁數向上取整    totalPage = (int) Math.ceil(listDatas.size() * 1.0 / mPageSize);    viewPagerList = new ArrayList<View>();    for(int i = 0; i < totalPage; i++){      //每個頁面都是inflate出一個新實例      final GridView gridView = (GridView)View.inflate(this, R.layout.item_gridview, null);      gridView.setAdapter(new MyGridViewAdpter(this, listDatas, i, mPageSize));      //添加item點擊監聽      gridView.setOnItemClickListener(new OnItemClickListener() {        @Override        public void onItemClick(AdapterView<?> arg0, View arg1,            int position, long arg3) {          // TODO Auto-generated method stub          Object obj = gridView.getItemAtPosition(position);          if(obj != null && obj instanceof ProdctBean){            System.out.println(obj);            Toast.makeText(MyActivity.this, ((ProdctBean)obj).getName(), Toast.LENGTH_SHORT).show();          }        }      });      //每一個GridView作為一個View對象添加到ViewPager集合中            viewPagerList.add(gridView);    }    //設置ViewPager適配器    viewPager.setAdapter(new MyViewPagerAdapter(viewPagerList));        //添加小圓點    ivPoints = new ImageView[totalPage];    for(int i = 0; i < totalPage; i++){      //循壞加入點點圖片組      ivPoints[i] = new ImageView(this);      if(i==0){        ivPoints[i].setImageResource(R.drawable.page_focuese);      }else {        ivPoints[i].setImageResource(R.drawable.page_unfocused);      }      ivPoints[i].setPadding(8, 8, 8, 8);      group.addView(ivPoints[i]);    }    //設置ViewPager的滑動監聽，主要是設置點點的背景顏色的改變    viewPager.setOnPageChangeListener(new ViewPager.SimpleOnPageChangeListener(){      @Override      public void onPageSelected(int position) {        // TODO Auto-generated method stub        //currentPage = position;        for(int i=0 ; i < totalPage; i++){          if(i == position){            ivPoints[i].setImageResource(R.drawable.page_focuese);          }else {            ivPoints[i].setImageResource(R.drawable.page_unfocused);          }        }      }    });  }}

6.ViewPage的適配器代碼

package com.item.jiejie.adapter;import java.util.List;import android.support.v4.view.PagerAdapter;import android.view.View;import android.view.ViewGroup;/** * ViewPage的適配器 * @author Administrator * */public class MyViewPagerAdapter extends PagerAdapter{    private List<View> viewList;//View就二十GridView      public MyViewPagerAdapter(List<View> viewList) {    this.viewList = viewList;  }  @Override  public int getCount() {    // TODO Auto-generated method stub    return viewList!=null ? viewList.size() : 0;  }  @Override  public boolean isViewFromObject(View arg0, Object arg1) {    // TODO Auto-generated method stub    return arg0 == arg1;  }  /**   * 將當前的View添加到ViewGroup容器中   * 這個方法，return一個對象，這個對象表明了PagerAdapter適配器選擇哪個對象放在當前的ViewPage上   */  @Override  public Object instantiateItem(ViewGroup container, int position) {    // TODO Auto-generated method stub    container.addView(viewList.get(position));    return viewList.get(position);  }    @Override  public void destroyItem(ViewGroup container, int position, Object object) {    // TODO Auto-generated method stub     container.removeView((View) object);  }}

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