GridView的使用

     最近，因为公司的项目，有类似支付宝九宫格的效果，所以采用了gridview来实现。做出来之后发现，效果还可以，所以总结一下。

     主界面：

<span style="font-family:KaiTi_GB2312;font-size:14px;"><?xml version="1.0" encoding="UTF-8"?>
<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" android:paddingBottom="@dimen/activity_vertical_margin"
	android:paddingLeft="@dimen/activity_horizontal_margin"
	android:paddingRight="@dimen/activity_horizontal_margin"
	android:paddingTop="@dimen/activity_vertical_margin" tools:context="com.example.lele.MainActivity">

	<GridView android:id="@+id/gridview" android:layout_width="match_parent"
		android:layout_height="match_parent" android:columnWidth="100dp"
		android:numColumns="2" android:verticalSpacing="10dp"
		android:horizontalSpacing="10dp" android:stretchMode="columnWidth"
		android:gravity="center" />

</RelativeLayout>

</span>

    item界面：

<pre name="code" class="html"><span style="font-family:KaiTi_GB2312;font-size:14px;"><?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >
    <ImageView android:id="@+id/imageview" android:layout_width="wrap_content" android:layout_height="wrap_content"
        android:background="@drawable/ic_launcher" android:layout_gravity="center_horizontal"
        android:layout_margin="10dp"/>
    <TextView android:id="@+id/textview" android:layout_width="wrap_content" android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal" android:text="android"/>
</LinearLayout></span>

         Java代码：

<span style="font-family:KaiTi_GB2312;font-size:14px;"></span><pre name="code" class="java"><span style="font-family:KaiTi_GB2312;font-size:14px;">package com.example.lele;

import java.util.ArrayList;
import java.util.List;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.AdapterView.OnItemSelectedListener;
import android.widget.BaseAdapter;
import android.widget.GridView;
import android.widget.ImageView;
import android.widget.TextView;


public class MainActivity extends Activity {
    private List<object> list;
    private TextView textview;
    private ImageView imageview;
    private adapter mydapter;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main); 
        list=new ArrayList<object>();
        GridView gridview=(GridView) findViewById(R.id.gridview);
        mydapter=new adapter();
        gridview.setAdapter(mydapter);
        gridview.setOnItemClickListener(new OnItemClickListener() {
			@Override
			public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
					long arg3) {
				
			}
		});
      /*  gridview.setOnItemSelectedListener(new OnItemSelectedListener() {
			@Override
			public void onItemSelected(AdapterView<?> arg0, View arg1,
					int arg2, long arg3) {
			}
			@Override
			public void onNothingSelected(AdapterView<?> arg0) {
			}
		});*/
        initData();
    }
    
	private void initData() {
		object obj1=new object();
		obj1.setStr("淘宝");
		obj1.setId(R.drawable.bbs_gszq_normal);
		list.add(obj1);
		object obj2=new object();
		obj2.setStr("支付宝");
		obj2.setId(R.drawable.bbs_hfppc_normal);
		list.add(obj2);
		object obj3=new object();
		obj3.setStr("菜鸟");
		obj3.setId(R.drawable.bbs_hfxd_normal);
		list.add(obj3);
		object obj4=new object();
		obj4.setStr("余额宝");
		obj4.setId(R.drawable.bbs_ldgg_normal);
		list.add(obj4);
		object obj5=new object();
		obj5.setStr("天猫");
		obj5.setId(R.drawable.bbs_mb_normal);
		list.add(obj5);
		object obj6=new object();
		obj6.setStr("阿里云");
		obj6.setId(R.drawable.bbs_smf_normal);
		list.add(obj6);
		//mydapter.notifyDataSetChanged();
	}

	public class adapter extends BaseAdapter{
		
		@Override
		public View getView(int arg0, View arg1, ViewGroup arg2) {
			arg1=View.inflate(getApplicationContext(), R.layout.main_item, null);
			textview=(TextView) arg1.findViewById(R.id.textview);
			imageview=(ImageView) arg1.findViewById(R.id.imageview);
			textview.setText(list.get(arg0).getStr());
			imageview.setImageResource(list.get(arg0).getId());
			return arg1;
		}
		
		@Override
		public long getItemId(int arg0) {
			return arg0;
		}
		
		@Override
		public Object getItem(int arg0) {
			return list.get(arg0);
		}
		
		@Override
		public int getCount() {
			return list.size();
		}
	}
    
	public class object
	{
		String str;
		int id;
		public String getStr() {
			return str;
		}
		public void setStr(String str) {
			this.str = str;
		}
		public int getId() {
			return id;
		}
		public void setId(int id) {
			this.id = id;
		}
	}
}
</span>

    从上面可以看出，gridview的使用和listview的使用，几乎一致。需要注意的是：一，如果gridview是嵌套在ScrollView中的话，需要自定义gridview，这样才会避免gridview只显示一行的bug；二，一般情况下，尽可能使用setOnItemClickListener，而不要使用setOnItemSelectedListener。因为经过一天的调试，发现很多时候，setOnItemSelectedListener是不会被响应的，而setOnItemClickListener则不会出现此种情况。具体原因，尚不清楚。