Android实现为GridView添加边框效果

<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"   android:layout_width="wrap_content"   android:layout_height="wrap_content" >   <ImageView     android:id="@+id/item_image"     android:layout_width="115dp"     android:layout_height="115dp"     android:padding="8dp"     android:background="@drawable/grid_selector"      /> </LinearLayout> 

<?xml version="1.0" encoding="utf-8"?> <selector xmlns:android="http://schemas.android.com/apk/res/android">     <item android:state_window_focused="false"      android:drawable="@drawable/grid_normal" />    <item android:state_selected="true"     android:drawable="@drawable/grid_pressed" />      <item android:state_pressed="true"     android:drawable="@drawable/grid_pressed" /> </selector> 

android:listSelector="@android:color/transparent" 

import java.util.ArrayList; import android.content.Context; import android.graphics.drawable.Drawable; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.BaseAdapter; import android.widget.ImageView;  public class GridAdapter extends BaseAdapter {   private Context mContext = null;   private LayoutInflater inflater = null;   private ArrayList<Drawable> drawableList = null;    public GridAdapter(Context c) {     this.mContext = c;     this.inflater = LayoutInflater.from(mContext);   }   public void setDataSource(ArrayList<Drawable> list){     this.drawableList = list;   }   public int getCount() {     if(drawableList != null){       return drawableList.size();     }else{       return 0;     }   }    public Object getItem(int position) {     return drawableList.get(position);   }    public long getItemId(int position) {     return position;   }    public View getView(int position, View convertView, ViewGroup parent) {      ImageView imageView = new ImageView(mContext);     if (convertView == null) {       convertView = inflater.inflate(R.layout.grid_item, null);       imageView = (ImageView) convertView.findViewById(R.id.item_image);       imageView.setScaleType(ImageView.ScaleType.CENTER_INSIDE);       convertView.setTag(imageView);     } else {       imageView = (ImageView) convertView.getTag();     }     imageView.setImageDrawable(drawableList.get(position));     return convertView;   } }