控件 -- GridView

一、概念

网格展示控件。

二、使用

1.基本属性

android:numColumns="auto_fit" 列数设置为自动
android:columnWidth="90dp" 每列的宽度，也就是Item的宽度
android:stretchMode="columnWidth" 缩放与列宽大小同步
android:verticalSpacing="10dp" 垂直边距
android:horizontalSpacing="10dp" 水平边距

2.例子

//activity_grid_view.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#000000"
    android:orientation="vertical">

    <GridView
        android:id="@+id/gridView"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:columnWidth="90dp"
        android:horizontalSpacing="6dp"
        android:numColumns="auto_fit"
        android:stretchMode="columnWidth"
        android:verticalSpacing="6dp"></GridView>

</LinearLayout>
 
//item.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:gravity="center"
    android:orientation="vertical"
    android:padding="10dp">

    <ImageView
        android:id="@+id/image"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal"
        android:src="@mipmap/ic_launcher" />
    <TextView
        android:id="@+id/text"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal"
        android:layout_marginTop="6dp"
        android:text="@string/app_name"
        android:textColor="#FFF" />
</LinearLayout>

//Activity
public class GridViewActivity extends AppCompatActivity {
    private GridView gridView;
    private List<Map<String, Object>> data_list;
    private SimpleAdapter adapter;
    private int[] icons = {R.mipmap.ic_launcher, R.mipmap.ic_launcher, R.mipmap.ic_launcher
            , R.mipmap.ic_launcher, R.mipmap.ic_launcher, R.mipmap.ic_launcher
            , R.mipmap.ic_launcher, R.mipmap.ic_launcher, R.mipmap.ic_launcher
            , R.mipmap.ic_launcher, R.mipmap.ic_launcher, R.mipmap.ic_launcher
            , R.mipmap.ic_launcher, R.mipmap.ic_launcher, R.mipmap.ic_launcher};
    private String[] text = {"111", "222", "333", "444", "555", "666", "777", "888", "999", "000", "123", "234", "345", "456", "555"};

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_grid_view);

        gridView = (GridView) findViewById(R.id.gridView);
        data_list = new ArrayList<Map<String, Object>>();
        getData();
        //加载适配器
        String[] form = {"image", "text"};
        int[] to = {R.id.image, R.id.text};
        adapter = new SimpleAdapter(this, data_list, R.layout.item, form, to);
        gridView.setAdapter(adapter);
        //监听item每一项
        gridView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
                Toast.makeText(GridViewActivity.this, "你点击了第" + i, Toast.LENGTH_SHORT).show();
            }
        });
    }

    //准备数据源
    public List<Map<String, Object>> getData() {

        for (int i = 0; i < icons.length; i++) {
            Map<String, Object> map = new HashMap<String, Object>();
            map.put("image", icons[i]);
            map.put("text", text[i]);
            data_list.add(map);
        }
        return data_list;
    }
}