android 自定义gallery去除空白页

package com.testgridview; import android.app.Activity; import android.content.Context; import android.os.Bundle; import android.util.Log; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.AdapterView; import android.widget.AdapterView.OnItemClickListener; import android.widget.BaseAdapter; import android.widget.GridView; import android.widget.HorizontalScrollView; import android.widget.ImageView; import android.widget.LinearLayout.LayoutParams; import android.widget.TextView; public class TestGridViewActivity extends Activity { static class ViewHolder { ImageView mImg; TextView mTxt; } private GridView mGridView; private HorizontalScrollView mScrollView; private String TAG = "TestGridView"; /** * 列宽 */ private int cWidth = 120; /** * 水平间距 */ private int hSpacing = 10; private int mWidthPixels; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); mWidthPixels = getResources().getDisplayMetrics().widthPixels; findView(); setValue(); setListener(); } private void findView() { mGridView = (GridView) findViewById(R.id.mGridView); mScrollView = (HorizontalScrollView) findViewById(R.id.mScrollView); mScrollView.setHorizontalScrollBarEnabled(false);// 隐藏滚动条 } private void setValue() { MAdapter mAdapter = new MAdapter(TestGridViewActivity.this); mGridView.setAdapter(mAdapter); LayoutParams params = new LayoutParams(mAdapter.getCount() * (48 + 10), LayoutParams.WRAP_CONTENT); mGridView.setLayoutParams(params); mGridView.setColumnWidth(cWidth); mGridView.setHorizontalSpacing(hSpacing); mGridView.setStretchMode(GridView.NO_STRETCH); mGridView.setNumColumns(mAdapter.getCount()); } private void setListener() { mGridView.setOnItemClickListener(new OnItemClickListener() { @Override public void onItemClick(AdapterView<?> parent, View view, int position, long id) { int x = (int) (view.getLeft()+view.getWidth()/2.0-mWidthPixels/2.0); mScrollView.smoothScrollTo(x, 0); } }); } class MAdapter extends BaseAdapter { Context mContext; LayoutInflater mInflater; public MAdapter(Context c) { mContext = c; mInflater = LayoutInflater.from(mContext); } @Override public int getCount() { return 60; } @Override public Object getItem(int arg0) { return arg0; } @Override public long getItemId(int arg0) { return arg0; } @Override public View getView(int position, View contentView, ViewGroup arg2) { ViewHolder holder; if (contentView == null) { holder = new ViewHolder(); contentView = mInflater.inflate(R.layout.gridview_item, null); holder.mImg = (ImageView) contentView.findViewById(R.id.mImage); holder.mTxt = (TextView) contentView.findViewById(R.id.mText); } else { holder = (ViewHolder) contentView.getTag(); } holder.mTxt.setText("测试"+position); contentView.setTag(holder); return contentView; } } }