自訂兩行可左右滑動的GridView

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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; // 每行顯示個數private int hSpacing = 20;// 水平間距@Overrideprotected 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);// 隱藏捲軸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);}@Overridepublic 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;}}