我新建了一个Android的技术交流群,群号为86686524 120059404,感兴趣的可以申请加入,大家一块学习。
- 新建一个HelloGridView的工程
- 修改main.xml代码如下: Xml代码
- <?xmlversion="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:horizontalSpacing="10dp"
- android:verticalSpacing="10dp"
- android:stretchMode="columnWidth"
- android:gravity="center">
- </GridView>
很简单,就是一个GridView。设置列宽为90dp,这样当我们的numColumns设置为auto_fit时,Android就会自动计算我们手机屏幕的大小以决定每一行展示几个元素。这是很方便。android:horizontalSpacing定义列之间的间隔,android:verticalSpacing定义行之间的间隔。android:stretchMode设置为columnWidth是意味着根据列宽自动缩放。
修改我们Activity HelloGridView如下:
Java代码
- /**
- *
- * @author 飞雪无情
- * @since 2011-1-20
- */
- public class HelloGridView extends Activity {
- /** Called when the activity is first created. */
- @Override
- protected void onCreate(Bundle savedInstanceState) {
- super.onCreate(savedInstanceState);
- setContentView(R.layout.main);
- GridView gridView=(GridView)findViewById(R.id.gridview);
- gridView.setAdapter(new ImageAdapter(this));
- //单击GridView元素的响应
- gridView.setOnItemClickListener(new OnItemClickListener() {
-
- @Override
- public void onItemClick(AdapterView<?> parent, View view,
- int position, long id) {
- //弹出单击的GridView元素的位置
- Toast.makeText(HelloGridView.this,mThumbIds[position], Toast.LENGTH_SHORT).show();
- }
- });
- }
- private class ImageAdapter extends BaseAdapter{
- private Context mContext;
-
- public ImageAdapter(Context context) {
- this.mContext=context;
- }
-
- @Override
- public int getCount() {
- return mThumbIds.length;
- }
-
- @Override
- public Object getItem(int position) {
- return mThumbIds[position];
- }
-
- @Override
- public long getItemId(int position) {
- // TODO Auto-generated method stub
- return 0;
- }
-
- @Override
- public View getView(int position, View convertView, ViewGroup parent) {
- //定义一个ImageView,显示在GridView里
- ImageView imageView;
- if(convertView==null){
- imageView=new ImageView(mContext);
- imageView.setLayoutParams(new GridView.LayoutParams(85, 85));
- imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
- imageView.setPadding(8, 8, 8, 8);
- }else{
- imageView = (ImageView) convertView;
- }
- imageView.setImageResource(mThumbIds[position]);
- return imageView;
- }
-
-
-
- }
- //展示图片
- private Integer[] mThumbIds = {
- R.drawable.sample_2, R.drawable.sample_3,
- R.drawable.sample_4, R.drawable.sample_5,
- R.drawable.sample_6, R.drawable.sample_7,
- R.drawable.sample_0, R.drawable.sample_1,
- R.drawable.sample_2, R.drawable.sample_3,
- R.drawable.sample_4, R.drawable.sample_5,
- R.drawable.sample_6, R.drawable.sample_7,
- R.drawable.sample_0, R.drawable.sample_1,
- R.drawable.sample_2, R.drawable.sample_3,
- R.drawable.sample_4, R.drawable.sample_5,
- R.drawable.sample_6, R.drawable.sample_7
- };
- }
这里我们也是采用的自定义Adapter,可以上一节的自定义Adapter讲解。展示了一些图片,然后点击一个图片的时候会显示这个图片所在的位置。
运行程序,效果图如下: