Gridview

main xml

<GridView
    android:numColumns="3"
    android:stretchMode="columnWidth"
    android:gravity="center"
    android:verticalSpacing="5dp"
    android:horizontalSpacing="10dp"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:id="@+id/grid_view">
</GridView>

gridview—item xml

<ImageView
    android:id="@+id/image_view"
    android:layout_width="100dp"
    android:layout_height="100dp" />

main java

public class MainActivity extends AppCompatActivity {
private GridView grid_view;
private SimpleAdapter adapter;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
            grid_view=(GridView)findViewById(R.id.grid_view);
            adapter = new SimpleAdapter(this,getData(),
                    R.layout.gridview_item,
                    new String[]{"image_view"},
                    new int[]{R.id.image_view});

            grid_view = (GridView) findViewById(R.id.grid_view);
            grid_view.setAdapter(adapter);

            grid_view.setOnItemClickListener(new AdapterView.OnItemClickListener() {
                @Override
                public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                    String data = (String) grid_view.getItemAtPosition(position);
                }
            });

        }

        private List<HashMap<String, Object>> getData() {
            List<HashMap<String, Object>> datas = new ArrayList<>();

            // 给list增加一条数据
            HashMap<String, Object> data = new HashMap<>();
            // Map映射添加数据
            data.put("image_view", R.mipmap.h);
            // 将这个map放到list中
            datas.add(data);

            data = new HashMap<>();
            data.put("image_view", R.mipmap.hh);
            datas.add(data);

            data = new HashMap<>();
            data.put("image_view", R.mipmap.hhh);
            datas.add(data);

            data = new HashMap<>();
            data.put("image_view", R.mipmap.hhhh);
            datas.add(data);

            data = new HashMap<>();
            data.put("image_view", R.mipmap.hhhhh);
            datas.add(data);

            data = new HashMap<>();
            data.put("image_view", R.mipmap.hhhhhhhh);
            datas.add(data);

            data = new HashMap<>();
            data.put("image_view", R.mipmap.hhhhhhhhh);
            datas.add(data);

            data = new HashMap<>();
            data.put("image_view", R.mipmap.hhhhhh);
            datas.add(data);

            data = new HashMap<>();
            data.put("image_view", R.mipmap.hhhhhhh);
            datas.add(data);

            return datas;
        }

}