android基础入门GridView视图(12)
一.GridView(网格视图):
我们可以将GridView和一个ImageView配合使用来显示一系列的图像。
GridView属性介绍:
android:columnWidth 设置列的宽度。
android:verticalSpacing 设置两行之间的间距。
android:horizontalSpacing 设置两列之间的间距。
android:stretchMode 设置缩放模式。
android:numColumns 设置显示的列数。
android:gravity 设置此组件中的内容在组件中的位置。可选的值有:top、bottom、left、right、center_vertical、fill_vertical、center_horizontal、fill_horizontal、center、fill、clip_vertical可以多选,用“|”分开。
实例演示:
布局文件:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="vertical" > <GridView android:id="@+id/gridView1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:verticalSpacing="10dp" android:horizontalSpacing="10dp" android:stretchMode="columnWidth" android:gravity="center" android:numColumns="3" > </GridView> <ImageView android:id="@+id/img" android:layout_width="wrap_content" android:layout_height="wrap_content" /> </LinearLayout>
实现代码:
public class MainActivity extends Activity { //可以自己设置图片,图片大小不宜过大。 Integer[] img = { R.drawable.img1, R.drawable.img2,R.drawable.img3, R.drawable.img4,R.drawable.img5, R.drawable.img8,R.drawable.img9, }; private ImageView imgView; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); imgView = (ImageView)findViewById(R.id.img); GridView gird = (GridView)findViewById(R.id.gridView1); gird.setAdapter(new ImageAdapter(this)); gird.setOnItemClickListener(new OnItemClickListener() { @Override public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) { imgView.setBackgroundResource(img[arg2]); Toast.makeText(getApplicationContext(), "点击了"+arg2, Toast.LENGTH_SHORT).show(); } }); } public class ImageAdapter extends BaseAdapter{ public Context context; public ImageAdapter(Context context){ this.context = context; } @Override public int getCount() { // TODO Auto-generated method stub return img.length; } @Override public Object getItem(int position) { // TODO Auto-generated method stub return position; } @Override public long getItemId(int position) { // TODO Auto-generated method stub return position; } @Override public View getView(int position, View convertView, ViewGroup parent) { // TODO Auto-generated method stub ImageView imageView; if(convertView == null){ imageView = new ImageView(context); imageView.setLayoutParams(new GridView.LayoutParams(85,85)); imageView.setScaleType(ImageView.ScaleType.CENTER_CROP); imageView.setPadding(5, 5, 5, 5); }else{ imageView = (ImageView)convertView; } imageView.setImageResource(img[position]); return imageView; } } @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.main, menu); return true; } }
<?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" android:orientation="vertical" > <GridView android:id="@+id/gridView1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:verticalSpacing="10dp" android:horizontalSpacing="10dp" android:stretchMode="columnWidth" android:gravity="center" android:numColumns="3" > </GridView> </LinearLayout>
<?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>
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.activity_main); //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.ic_launcher);//使用系统默认图标 item.put("textItem", "icon" + i);//按序号添加ItemText items.add(item); } //实例化一个适配器,第二个参数是需要绑定的数据,第三个参数是实现的布局方式,第四和第五个参数是实现组件与数据的绑定。 SimpleAdapter adapter = new SimpleAdapter(this, items, R.layout.main, new String[]{"imageItem", "textItem"}, new int[]{R.id.image_item, R.id.text_item}); //获得GridView实例 gv = (GridView)findViewById(R.id.gridView1); //为GridView设置适配器 gv.setAdapter(adapter); } @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.main, menu); return true; } }
运行图片:
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