Gridview

public class MainActivity extends AppCompatActivity {    GridView mGridView;    ArrayAdapter mAdapter;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        mGridView= (GridView)     findViewById(R.id.gridview);        mAdapter=new ArrayAdapter(this,R.layout.item, new String[]{"a","b","c","d",        "e","f","g"});        mGridView.setAdapter(mAdapter);        mGridView.setNumColumns(3);//xml 列数        mGridView.setColumnWidth(80);//xml  行高        mGridView.setVerticalSpacing(10);//  垂直间距        mGridView.setHorizontalSpacing(10);//  水平间距    }}`

运行结果