GridView中均分中碰到的几个问题

GridView使用过程中，碰到的几个坑，在此记录一下！

删掉GridView中grid view 外margin

GridView gridView = new GridView(this); setContentView(gridView); gridView.setNumColumns(4); //set STRETCH_SPACING stretch mode gridView.setStretchMode(GridView.STRETCH_COLUMN_WIDTH); //见下文“运行Demo，需要的其他部分” SimpleAdapter adapter = new SimpleAdapter(this); List<String> beanList = new ArrayList<>(); beanList.add(new String("叮咚新闻")); beanList.add(new String("叮咚新闻")); beanList.add(new String("叮咚新闻")); beanList.add(new String("叮咚新闻")); beanList.add(new String("叮咚新闻")); adapter.setData(beanList); gridView.setAdapter(adapter); // //必须取代掉原来的布局，否则grid view 四周有相当大的边距 // gridView.setSelector(android.R.color.transparent); gridView.setGravity(Gravity.CENTER);

运行效果如下：

这个黄色的不伦不类，不属于grid view， 参考： http://www.educity.cn/wenda/151651.html 得知，是因为gridview中selector的问题，通过 gridView.setSelector(android.R.color.transparent)；替换掉即可

实现GridView中左右可用空间均分

这里使用STRETCH_COLUMN_WIDTH stretch mode.

GridView gridView = new GridView(this); setContentView(gridView); gridView.setNumColumns(4); //set STRETCH_SPACING stretch mode gridView.setStretchMode(GridView.STRETCH_COLUMN_WIDTH); SimpleAdapter adapter = new SimpleAdapter(this); List<String> beanList = new ArrayList<>(); beanList.add(new String("叮咚新闻")); beanList.add(new String("叮咚新闻")); beanList.add(new String("叮咚新闻")); beanList.add(new String("叮咚新闻")); beanList.add(new String("叮咚新闻")); adapter.setData(beanList); gridView.setAdapter(adapter); //必须取代掉原来的布局，否则grid view 四周有相当大的边距 gridView.setSelector(android.R.color.transparent); gridView.setGravity(Gravity.CENTER);

实现GridView中左右边界grid cell，紧靠着边界

GridView gridView = new GridView(this); setContentView(gridView); gridView.setNumColumns(4); //set STRETCH_SPACING stretch mode gridView.setStretchMode(GridView.STRETCH_SPACING); //set columnWidth ，or looks strange as below int viewWidth = (int) (getResources().getDisplayMetrics().density * 72); gridView.setColumnWidth(viewWidth); //SimpleAdapter 见下面的“运行Demo，需要的其他部分” SimpleAdapter adapter = new SimpleAdapter(this); List<String> beanList = new ArrayList<>(); beanList.add(new String("叮咚新闻")); beanList.add(new String("叮咚新闻")); beanList.add(new String("叮咚新闻")); beanList.add(new String("叮咚新闻")); beanList.add(new String("叮咚新闻")); adapter.setData(beanList); gridView.setAdapter(adapter); //必须取代掉原来的布局，否则grid view 四周有相当大的边距 gridView.setSelector(android.R.color.transparent); gridView.setGravity(Gravity.CENTER);

使用上面例子，不设置columnWidth，就会出现下面类似的情况：

运行Demo，需要的其他部分

<?xml version="1.0" encoding="utf-8"?> <!--bg_label_normal.xml--> <shape xmlns:android="http://schemas.android.com/apk/res/android" android:shape="rectangle"> <stroke android:width="1px" android:color="#e5e5e5"></stroke> <corners android:radius="4dp"></corners> <solid android:color="@android:color/white"></solid> </shape> <?xml version="1.0" encoding="utf-8"?> <!--cell_drag_category_sub.xml--> <TextView xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:background="@drawable/bg_label_normal" android:gravity="center" android:singleLine="true" android:textColor="@android:color/black" android:textSize="14sp"></TextView> package com.hang.androidtestdemo; import android.content.Context; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.AbsListView; import android.widget.BaseAdapter; import android.widget.TextView; import java.util.List; public class SimpleAdapter extends BaseAdapter { public SimpleAdapter(Context context) { this.mContext = context; } private List<String> beanList; private Context mContext; public void setData(List<String> beanList) { this.beanList = beanList; notifyDataSetChanged(); } @Override public int getCount() { return (beanList == null) ? 0 : beanList.size(); } @Override public String getItem(int position) { String bean = beanList.get(position); return bean; } @Override public long getItemId(int position) { return position; } @Override public View getView(int position, View convertView, ViewGroup parent) { if (convertView == null) { convertView = LayoutInflater.from(mContext).inflate(R.layout.cell_drag_category_sub, parent, false); AbsListView.LayoutParams viewParams = (AbsListView.LayoutParams) convertView.getLayoutParams(); int viewHeight = (int) (mContext.getResources().getDisplayMetrics().density * 29); int viewWidth = (int) (mContext.getResources().getDisplayMetrics().density * 72); viewParams.height = viewHeight; viewParams.width = viewWidth; } String item = getItem(position); ((TextView) convertView).setText(item); return convertView; } }