Android实现为GridView添加边框效果

为GridView添加边框效果，供大家参考，具体内容如下

1.自定义GridView的item样式：

grid_item.xml文件

<?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>

2.设置GridView item的背景：
grid_selector.xml文件

<?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> 

3.设置GridView的listSelector为透明：

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

4.自定义GridView的adapter：

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;
  }
} 

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持我们。