九宫格

界面布局，还是很简单和相似的

<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>

然后调整一下

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

View view = inflater.inflate(R.layout.fragment_gridview, container, false);
List<ClassInfo> datas = new ArrayList<>();
datas.add(new ClassInfo(R.drawable.sixsixsix));
要把图片的名字输入正确
由于是九宫格
所以我们的名字要输入九次
最后一步
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});

完工