10.android:fastScrollEnabled=”true” //GridView出现快速滚动的按钮(至少滚动4页才会显示)
11.android:fadingEdge=”none” //GridView衰落(褪去)边缘颜色为空，缺省值是vertical。(可以理解为上下边缘的提示色)
12.android:fadingEdgeLength=”10dip” //定义的衰落(褪去)边缘的长度
13.android:stackFromBottom=”true” //设置为true时，你做好的列表就会显示你列表的最下面
14.android:transcriptMode=”alwaysScroll” //当你动态添加数据时，列表将自动往下滚动最新的条目可以自动滚动到可视范围内
15.android:drawSelectorOnTop=”false” //点击某条记录不放，颜色会在记录的后面成为背景色,内容的文字可见(缺省为false)
子项
layout/layout_grid_item.xml
<RelativeLayout xmlns:android="schemas.android.com/apk/res/and…"
android:layout_width="match_parent"
android:layout_height="match_parent"
<ImageView
android:id="@+id/iv_head"
android:layout_width="90dp"
android:layout_height="90dp"
android:layout_centerInParent="true"
android:scaleType="centerCrop"
/>
Activity代码
package com.devilwwj.androiddevelopcourse.activities;
import android.content.Context;
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
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.ImageView;
import com.devilwwj.androiddevelopcourse.R;
import com.nostra13.universalimageloader.core.ImageLoader;
/**
-
A021-列表容器之GridView
-
@author devilwwj
*/
public class GridViewTestActivity extends ActionBarActivity implements OnItemClickListener {
private GridView gridView;
private Context mContext;
private ImageLoader imageLoader;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_gridview);
mContext = GridViewTestActivity.this;
imageLoader = ImageLoader.getInstance();
gridView = (GridView) this.findViewById(R.id.gridView);
gridView.setAdapter(new ImageAdapter(this));
}
// references to our images
private Integer[] mThumbIds = {
R.drawable.sample_2, R.drawable.sample_3,
R.drawable.sample_4, R.drawable.sample_5,
R.drawable.sample_6, R.drawable.sample_7,
R.drawable.sample_0, R.drawable.sample_1,
R.drawable.sample_2, R.drawable.sample_3,
R.drawable.sample_4, R.drawable.sample_5,
R.drawable.sample_6, R.drawable.sample_7,
R.drawable.sample_0, R.drawable.sample_1,
R.drawable.sample_2, R.drawable.sample_3,
R.drawable.sample_4, R.drawable.sample_5,
R.drawable.sample_6, R.drawable.sample_7
};
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
// TODO: 点击列表跳转到其他页面
}
private class ImageAdapter extends BaseAdapter {
private Context mContext;
public ImageAdapter(Context context) {
this.mContext = context;
}
@Override
public int getCount() {
return mThumbIds.length;
}
@Override
public Object getItem(int position) {
return null;
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder viewHolder = null;
if (convertView == null) {
convertView = LayoutInflater.from(mContext).inflate(R.layout.layout_grid_item, parent, false);
viewHolder = new ViewHolder();
viewHolder.itemImg = (ImageView) convertView.findViewById(R.id.iv_head);
convertView.setTag(viewHolder);
} else {
viewHolder = (ViewHolder) convertView.getTag();
}
// 这里只是模拟，实际开发可能需要加载网络图片，可以使用ImageLoader这样的图片加载框架来异步加载图片
imageLoader.displayImage("drawable://" + mThumbIds[position], viewHolder.itemImg);
return convertView;
}
class ViewHolder {
ImageView itemImg;
}
}
}
在Activity中我们做了以下几件事：
1、初始化控件
2、定义图片资源mThumbIds
3、定义ImageAdapter
