Android GridView中GridAdapter 用法详解

本文转载自查看原文 2012-06-06 16:45 13588 android开发

说到GridView Listview一定会提到他的adapter，现整理如下：

main.xml布局里面：

<GridView
	android:id="@+id/grid"
	android:layout_width="fill_parent"
	android:layout_height="fill_parent"
	android:columnWidth="70dp"
	android:numColumns="auto_fit" 
	android:verticalSpacing="10dp" 
	android:horizontalSpacing="10dp"
	android:stretchMode="columnWidth"
	android:gravity="center"
	/>

gridview_item.xml：

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
	android:layout_height="wrap_content" 
	android:layout_width="wrap_content"
	android:orientation="vertical"
	android:gravity="center"
	android:layout_gravity="center"
	>
	<LinearLayout 
		android:layout_height="wrap_content" 
		android:layout_width="wrap_content"
		android:orientation="vertical"
		android:gravity="center"
		android:layout_gravity="center">
		<ImageView 
			android:id="@+id/grid_icon"
			android:layout_height="80dip" 
			android:layout_width="80dip"
			android:gravity="center"
			android:layout_gravity="center" 
			>
		</ImageView>
		<TextView 
			android:id="@+id/grid_name"
			android:layout_width="wrap_content"
			android:layout_height="wrap_content"
			android:singleLine="true"
			android:gravity="center"
			android:layout_gravity="center"
			android:textSize="13px"
			android:layout_marginTop="4dip"
			>
		</TextView>
	</LinearLayout> 
</FrameLayout>

java 代码：

GridView grid = (GridView) findViewById(R.id.grid);
grid.setAdapter(new GridAdapter(this, mNameList, mDrawableList));

GridAdapter.java类：

package com.android.test;

import java.util.ArrayList;

import android.content.Context;
import android.graphics.drawable.Drawable;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.TextView;

public class GridAdapter extends BaseAdapter {
	private ArrayList<String> mNameList = new ArrayList<String>();
	private ArrayList<Drawable> mDrawableList = new ArrayList<Drawable>();
	private LayoutInflater mInflater;
	private Context mContext;
	LinearLayout.LayoutParams params;

	public GridAdapter(Context context, ArrayList<String> nameList, ArrayList<Drawable> drawableList) {
		mNameList = nameList;
		mDrawableList = drawableList;
		mContext = context;
		mInflater = LayoutInflater.from(context);
		
		params = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT);
		params.gravity = Gravity.CENTER;
	}

	public int getCount() {
		return mNameList.size();
	}

	public Object getItem(int position) {
		return mNameList.get(position);
	}

	public long getItemId(int position) {
		return position;
	}

	public View getView(int position, View convertView, ViewGroup parent) {
		ItemViewTag viewTag;
		
		if (convertView == null)
		{
			convertView = mInflater.inflate(R.layout.gridview_item, null);
			
			// construct an item tag
			viewTag = new ItemViewTag((ImageView) convertView.findViewById(R.id.grid_icon), (TextView) convertView.findViewById(R.id.grid_name));
			convertView.setTag(viewTag);
		} else
		{
			viewTag = (ItemViewTag) convertView.getTag();
		}
		
		// set name
		viewTag.mName.setText(mNameList.get(position));
		
		// set icon
		viewTag.mIcon.setBackgroundDrawable(mDrawableList.get(position));
		viewTag.mIcon.setLayoutParams(params);
		return convertView;
	}
	
	class ItemViewTag
	{
		protected ImageView mIcon;
		protected TextView mName;
		
		/**
		 * The constructor to construct a navigation view tag
		 * 
		 * @param name
		 *            the name view of the item
		 * @param size
		 *            the size view of the item
		 * @param icon
		 *            the icon view of the item
		 */
		public ItemViewTag(ImageView icon, TextView name)
		{
			this.mName = name;
			this.mIcon = icon;
		}
	}

}

到此，adapter的使用就算结束，效果图如下：

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