android用户界面-组件Widget-网格视图GridView
GridView按照行列的方式来显示内容。一般适合显示图标。图片等内容，主要用于设置Adapter。
通过基础类BaseAdapter类，重写getView()方法来设置图片显示格式。
/Chapter04_UI_GridView01/src/com/amaker/test/MainActivity.java
代码
package
com.amaker.test;
import
android.app.Activity;
import
android.content.Context;
import
android.os.Bundle;
import
android.view.View;
import
android.view.ViewGroup;
import
android.widget.BaseAdapter;
import
android.widget.GridView;
import
android.widget.ImageView;
public
class
MainActivity
extends
Activity {
private
GridView gv;
@Override
public
void
onCreate(Bundle savedInstanceState) {
super
.onCreate(savedInstanceState);
setContentView(R.layout.main);
gv
=
(GridView)findViewById(R.id.GridView01);
gv.setNumColumns(
4
);
//
gv.setNumColumns(3);
//
String[] strs = {"a","a1","a2","b","b1","b2","c","c1","c2"};
//
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,android.R.layout.simple_gallery_item,strs);
gv.setAdapter(
new
MyAdapter(
this
));
}
class
MyAdapter
extends
BaseAdapter{
private
Integer[] imgs
=
{
R.drawable.gallery_photo_1,
R.drawable.gallery_photo_2,
R.drawable.gallery_photo_3,
R.drawable.gallery_photo_4,
R.drawable.gallery_photo_5,
R.drawable.gallery_photo_6,
R.drawable.gallery_photo_7,
R.drawable.gallery_photo_8,
R.drawable.gallery_photo_1,
R.drawable.gallery_photo_2,
R.drawable.gallery_photo_3,
R.drawable.gallery_photo_4,
R.drawable.gallery_photo_5,
R.drawable.gallery_photo_6,
R.drawable.gallery_photo_7,
R.drawable.gallery_photo_8
};
Context context;
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;
}
public
View getView(
int
position, View convertView, ViewGroup parent) {
ImageView imageView;
if
(convertView
==
null
) {
imageView
=
new
ImageView(context);
imageView.setLayoutParams(
new
GridView.LayoutParams(
45
,
45
));
imageView.setAdjustViewBounds(
false
);
imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
imageView.setPadding(
8
,
8
,
8
,
8
);
}
else
{
imageView
=
(ImageView) convertView;
}
imageView.setImageResource(imgs[position]);
return
imageView;
}
}
}