博客

GridView(网格视图)是按照行列的方式来显示内容的，一般用于显示图片，图片等内容，比如实现九宫格图，用GridView是首选，也是最简单的。主要用于设置Adapter。

GridView常用的XML属性：

下面有三个例子，第一个是只显示图片的，第二个是显示图片文字的(这里的图片是Android系统自带的图片)，第三个是显示自定义的图片文字。前面两个例子的实现都不是很难，第三个例子的实现有些复杂，学习GridView的时候，就想着能不能自定义自己喜欢的图片加上文字，在网上找些资料，一般都是第二个例子的形式的，最后在视频学习上找到了能实现自定义自己的图片的例子。自己就照着例子去学习，修改成了第三个例子。

第一个例子：

MainActivity.java

package com.android.gridview.activity;

import android.app.Activity;

import android.content.Context;

import android.os.Bundle;

import android.view.View;

import android.view.ViewGroup;

import android.widget.AdapterView;

import android.widget.AdapterView.OnItemClickListener;

import android.widget.BaseAdapter;

import android.widget.GridView;

import android.widget.ImageView;

import android.widget.Toast;

public class MainActivity extends Activity {

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

GridView gv = (GridView)findViewById(R.id.GridView1);

//为GridView设置适配器

gv.setAdapter(new MyAdapter(this));

//注册监听事件

gv.setOnItemClickListener(new OnItemClickListener()

{

public void onItemClick(AdapterView<?> parent, View v, int position, long id)

{

Toast.makeText(MainActivity.this, “pic” + position, Toast.LENGTH_SHORT).show();

}

});

}

}

//自定义适配器

class MyAdapter extends BaseAdapter{

//上下文对象

private Context context;

//图片数组

private Integer[] imgs = {

R.drawable.pic0, R.drawable.pic1, R.drawable.pic2,

R.drawable.pic3, R.drawable.pic4, R.drawable.pic5,

R.drawable.pic6, R.drawable.pic7, R.drawable.pic8,

R.drawable.pic0, R.drawable.pic1, R.drawable.pic2,

R.drawable.pic3, R.drawable.pic4, R.drawable.pic5,

R.drawable.pic6, R.drawable.pic7, R.drawable.pic8,

};

MyAdapter(Context context){

this.context = context;

}

public int getCount() {

return imgs.length;

}

public Object getItem(int item) {

return item;

}

public long getItemId(int id) {

return id;

}

//创建View方法

public View getView(int position, View convertView, ViewGroup parent) {

ImageView imageView;

if (convertView == null) {

imageView = new ImageView(context);

imageView.setLayoutParams(new GridView.LayoutParams(75, 75));//设置ImageView对象布局

imageView.setAdjustViewBounds(false);//设置边界对齐

imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);//设置刻度的类型

imageView.setPadding(8, 8, 8, 8);//设置间距

}

else {

imageView = (ImageView) convertView;

}

imageView.setImageResource(imgs[position]);//为ImageView设置图片资源

return imageView;

}

}

main.xml

<?xml version=”1.0″ encoding=”utf-8″?>

<LinearLayout xmlns:android=”

http://schemas.android.com/apk/res/android

”

android:orientation=”vertical”

android:layout_width=”fill_parent”

android:layout_height=”fill_parent”

>

<GridView

android:id=”@+id/GridView1″

android:layout_width=”wrap_content”

android:layout_height=”wrap_content”

android:columnWidth=”90dp”

android:numColumns=”3″

android:verticalSpacing=”10dp”

android:horizontalSpacing=”10dp”

android:stretchMode=”columnWidth”

android:gravity=”center”

/>

</LinearLayout>

效果图：

第二个例子：

MainActivity.java

package com.android.gridview2.activity;

import java.util.ArrayList;

import java.util.HashMap;

import java.util.List;

import java.util.Map;

import android.app.Activity;

import android.os.Bundle;

import android.widget.GridView;

import android.widget.SimpleAdapter;

public class MainActivity extends Activity {

private GridView gv;

@Override

protected void onCreate(Bundle savedInstanceState) {

// TODO Auto-generated method stub

super.onCreate(savedInstanceState);

setContentView(R.layout.gridview);

//准备要添加的数据条目

List<Map<String, Object>> items = new ArrayList<Map<String,Object>>();

for (int i = 0; i < 9; i++) {

Map<String, Object> item = new HashMap<String, Object>();

item.put(“imageItem”, R.drawable.icon);//添加图像资源的ID

item.put(“textItem”, “icon” + i);//按序号添加ItemText

items.add(item);

}

//实例化一个适配器

SimpleAdapter adapter = new SimpleAdapter(this,

items,

R.layout.grid_item,

new String[]{“imageItem”, “textItem”},

new int[]{R.id.image_item, R.id.text_item});

//获得GridView实例

gv = (GridView)findViewById(R.id.mygridview);

//为GridView设置适配器

gv.setAdapter(adapter);

}

}

gridview.xml

<?xml version=”1.0″ encoding=”utf-8″?>

<LinearLayout xmlns:android=”

http://schemas.android.com/apk/res/android

”

android:layout_width=”wrap_content”

android:layout_height=”wrap_content”

>

<GridView

android:id=”@+id/mygridview”

android:numColumns=”3″

android:gravity=”center_horizontal”

android:layout_width=”wrap_content”

android:layout_height=”wrap_content”

android:stretchMode=”columnWidth”

/>

</LinearLayout>

grid_item.xml

<?xml version=”1.0″ encoding=”utf-8″?>

<RelativeLayout xmlns:android=”

http://schemas.android.com/apk/res/android

”

android:id=”@+id/RelativeLayout1″

android:layout_width=”wrap_content”

android:layout_height=”fill_parent”

android:paddingBottom=”6dip”

>

<ImageView

android:id=”@+id/image_item”

android:layout_width=”wrap_content”

android:layout_height=”wrap_content”

android:layout_centerHorizontal=”true”

/>

<TextView

android:id=”@+id/text_item”

android:layout_below=”@+id/image_item”

android:layout_height=”wrap_content”

android:layout_width=”wrap_content”

android:layout_centerHorizontal=”true”

/>

</RelativeLayout>

效果图：

第三个例子：

MainActivity.java

package com.android.gridview3;

import java.util.ArrayList;

import java.util.List;

import android.app.Activity;

import android.content.Context;

import android.os.Bundle;

import android.view.LayoutInflater;

import android.view.View;

import android.view.ViewGroup;

import android.widget.AdapterView;

import android.widget.BaseAdapter;

import android.widget.GridView;

import android.widget.ImageView;

import android.widget.TextView;

import android.widget.Toast;

import android.widget.AdapterView.OnItemClickListener;

public class MainActivity extends Activity

{

private GridView gridView;

//图片的文字标题

private String[] titles = new String[]

{ “pic1”, “pic2”, “pic3”, “pic4”, “pic5”, “pic6”, “pic7”, “pic8”, “pic9”};

//图片ID数组

private int[] images = new int[]{

R.drawable.pic1, R.drawable.pic2, R.drawable.pic3,

R.drawable.pic4, R.drawable.pic5, R.drawable.pic6,

R.drawable.pic7, R.drawable.pic8,R.drawable.pic9

};

@Override

public void onCreate(Bundle savedInstanceState){

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

gridView = (GridView) findViewById(R.id.gridview);

PictureAdapter adapter = new PictureAdapter(titles, images, this);

gridView.setAdapter(adapter);

gridView.setOnItemClickListener(new OnItemClickListener()

{

public void onItemClick(AdapterView<?> parent, View v, int position, long id)

{

Toast.makeText(MainActivity.this, “pic” + (position+1), Toast.LENGTH_SHORT).show();

}

});

}

}

//自定义适配器

class PictureAdapter extends BaseAdapter{

private LayoutInflater inflater;

private List<Picture> pictures;

public PictureAdapter(String[] titles, int[] images, Context context)

{

super();

pictures = new ArrayList<Picture>();

inflater = LayoutInflater.from(context);

for (int i = 0; i < images.length; i++)

{

Picture picture = new Picture(titles[i], images[i]);

pictures.add(picture);

}

}

@Override

public int getCount()

{

if (null != pictures)

{

return pictures.size();

} else

{

return 0;

}

}

@Override

public Object getItem(int position)

{

return pictures.get(position);

}

@Override

public long getItemId(int position)

{

return position;

}

@Override

public View getView(int position, View convertView, ViewGroup parent)

{

ViewHolder viewHolder;

if (convertView == null)

{

convertView = inflater.inflate(R.layout.picture_item, null);

viewHolder = new ViewHolder();

viewHolder.title = (TextView) convertView.findViewById(R.id.title);

viewHolder.image = (ImageView) convertView.findViewById(R.id.image);

convertView.setTag(viewHolder);

} else

{

viewHolder = (ViewHolder) convertView.getTag();

}

viewHolder.title.setText(pictures.get(position).getTitle());

viewHolder.image.setImageResource(pictures.get(position).getImageId());

return convertView;

}

}

class ViewHolder

{

public TextView title;

public ImageView image;

}

class Picture

{

private String title;

private int imageId;

public Picture()

{

super();

}

public Picture(String title, int imageId)

{

super();

this.title = title;

this.imageId = imageId;

}

public String getTitle()

{

return title;

}

public void setTitle(String title)

{

this.title = title;

}

public int getImageId()

{

return imageId;

}

public void setImageId(int imageId)

{

this.imageId = imageId;

}

}

main.xml

<?xml version=”1.0″ encoding=”utf-8″?>

<GridView xmlns:android=”

http://schemas.android.com/apk/res/android

”

android:id=”@+id/gridview”

android:layout_width=”fill_parent”

android:layout_height=”fill_parent”

android:columnWidth=”90dp”

android:numColumns=”auto_fit”

android:verticalSpacing=”10dp”

android:horizontalSpacing=”10dp”

android:stretchMode=”columnWidth”

android:gravity=”center”

/>

picture_item.xml

<?xml version=”1.0″ encoding=”utf-8″?>

<LinearLayout

xmlns:android=”

http://schemas.android.com/apk/res/android

”

android:id=”@+id/root”

android:orientation=”vertical”

android:layout_width=”wrap_content”

android:layout_height=”wrap_content”

android:layout_marginTop=”5dp”

>

<ImageView

android:id=”@+id/image”

android:layout_width=”100dp”

android:layout_height=”150dp”

android:layout_gravity=”center”

android:scaleType=”fitXY”

android:padding=”4dp”

/>

<TextView

android:id=”@+id/title”

android:layout_width=”wrap_content”

android:layout_height=”wrap_content”

android:layout_gravity=”center”

android:gravity=”center_horizontal”

/>

</LinearLayout>

效果图：

本文出自 “IT的点点滴滴” 博客