自定义两行可左右滑动的GridView

效果图：

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<?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:orientation="vertical" >

    <HorizontalScrollView
        android:id="@+id/scrollView"
        android:layout_width="match_parent"
        android:layout_height="match_parent" >

        <LinearLayout
            android:id="@+id/linearLayout1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content" >

            <GridView
                android:id="@+id/gridView1"
                android:layout_width="match_parent"
                android:layout_height="match_parent" >
            </GridView>
        </LinearLayout>
    </HorizontalScrollView>

</LinearLayout>

public class MainActivity extends Activity {
	HorizontalScrollView horizontalScrollView;
	GridView gridView;
	DisplayMetrics dm;
	private int NUM = 4; // 每行显示个数
	private int hSpacing = 20;// 水平间距

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

		horizontalScrollView = (HorizontalScrollView) findViewById(R.id.scrollView);
		gridView = (GridView) findViewById(R.id.gridView1);

		horizontalScrollView.setHorizontalScrollBarEnabled(false);// 隐藏滚动条
		getScreenDen();
		setValue();
	}

	private void setValue() {
		MyGridViewAdapter adapter = new MyGridViewAdapter(this, 21);
		int count = adapter.getCount();
		int columns = (count % 2 == 0) ? count / 2 : count / 2 + 1;
		gridView.setAdapter(adapter);
		LayoutParams params = new LayoutParams(columns * dm.widthPixels / NUM,
				LayoutParams.WRAP_CONTENT);
		gridView.setLayoutParams(params);
		gridView.setColumnWidth(dm.widthPixels / NUM);
		// gridView.setHorizontalSpacing(hSpacing);
		gridView.setStretchMode(GridView.NO_STRETCH);
		if (count <= 3) {
			gridView.setNumColumns(count);
		} else {
			gridView.setNumColumns(columns);
		}
	}

	private void getScreenDen() {
		dm = new DisplayMetrics();
		getWindowManager().getDefaultDisplay().getMetrics(dm);
	}

	@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;
	}

}

补充：移动开发 , Android ,