遍历指定目录下的图片文件 显示在gridview 并添加点击事件

先上图：

 

gridview布局

<?xml version="1.0" encoding="utf-8"?>   
<GridView xmlns:android="http://schemas.android.com/apk/res/android"     
    android:id="@+id/gridview"   
    android:layout_width="fill_parent"     
    android:layout_height="fill_parent"   
    android:columnWidth="90dp"   
    android:numColumns="auto_fit"   
    android:verticalSpacing="10dp"   
    android:horizontalSpacing="10dp"   
    android:stretchMode="columnWidth"   
    android:gravity="center"   
    />   

　　item配件布局

<?xml version="1.0" encoding="utf-8"?>   
<LinearLayout   
    xmlns:android="http://schemas.android.com/apk/res/android"   
    android:id="@+id/root"   
    android:orientation="vertical"     
    android:layout_width="wrap_content"   
    android:layout_height="wrap_content"     
    android:layout_marginTop="5dp"   
    >   
    <ImageView     
        android:id="@+id/image"   
        android:layout_width="100dp"   
        android:layout_height="150dp"     
        android:layout_gravity="center"   
        android:scaleType="fitXY"   
        android:padding="4dp"   
       />   
    <TextView     
        android:id="@+id/title"   
        android:layout_width="wrap_content"   
        android:layout_height="wrap_content"     
        android:layout_gravity="center"   
        android:gravity="center_horizontal"   
        />   
</LinearLayout>   

　　主Activity

package com.su.testgrid3;  
import android.app.Activity;  
import android.os.Bundle;  
import android.os.Environment;  
import android.view.View;  
import android.widget.AdapterView;  
import android.widget.AdapterView.OnItemLongClickListener;  
import android.widget.GridView;  
import android.widget.Toast;  
import android.widget.AdapterView.OnItemClickListener;  
  
public class TestGrid3Activity extends Activity {  
    private GridView gridView;  
    @Override  
    public void onCreate(Bundle savedInstanceState) {  
        super.onCreate(savedInstanceState);  
        setContentView(R.layout.main);  
         
        String[] titles = FileUtil.getImageNames("/mnt/sdcard/k/");  
        String[] imagePaths = new String[titles.length];  
        for (int i = 0; i < titles.length; i++) {  
            imagePaths="/mnt/sdcard/k/"+titles;  
        }  
         
        gridView = (GridView) findViewById(R.id.gridview);  
        PictureAdapter adapter = new PictureAdapter(titles, imagePaths, this);  
        gridView.setAdapter(adapter);  
  
        gridView.setOnItemClickListener(new OnItemClickListener() {  
            public void onItemClick(AdapterView<?> parent, View v,  
                    int position, long id) {  
                Toast.makeText(TestGrid3Activity.this, "你点击了" + (position + 1),  
                        Toast.LENGTH_SHORT).show();  
            }  
        });  
         
        gridView.setOnItemLongClickListener(new OnItemLongClickListener(){  
            public boolean onItemLongClick(AdapterView<?> parent, View v,  
                    int position, long id) {  
                Toast.makeText(TestGrid3Activity.this, "你长按了" + (position + 1),  
                        Toast.LENGTH_SHORT).show();  
                return true;  
                /*
                 * 这里需要true
                 * 因为:OnItemLongClick事件中：down事件返回值标记此次事
                 * 件是否为点击事件（返回false，是点击事件；返回true，不记为点击事件），
                 * 而up事件标记此次事件结束时间，也就是判断是否为长按。
                 */  
                  
            }  
              
        });  
    }  
}  

　　适配器

// 

package com.su.testgrid3; 

import java.util.ArrayList; 
import java.util.List; 

import android.content.Context; 
import android.graphics.BitmapFactory; 
import android.view.LayoutInflater; 
import android.view.View; 
import android.view.ViewGroup; 
import android.widget.BaseAdapter; 
import android.widget.ImageView; 
import android.widget.TextView; 

//自定义适配器 
class PictureAdapter extends BaseAdapter { 
private LayoutInflater inflater; 
private List<Picture> pictures; 

public PictureAdapter(String[] titles, String[] images, Context context) { 
super(); 
pictures = new ArrayList<Picture>(); 
inflater = LayoutInflater.from(context); 
for (int i = 0; i < images.length; i++) { 
Picture picture = new Picture(titles, images); 
pictures.add(picture); 
} 
} 

@Override 
public int getCount() { 
if (null != pictures) { 
return pictures.size(); 
} else { 
return 0; 
} 
} 

@Override 
public Object getItem(int position) { 
return pictures.get(position); 
} 

@Override 
public long getItemId(int position) { 
return position; 
} 

@Override 
public View getView(int position, View convertView, ViewGroup parent) { 
ViewHolder viewHolder; 
if (convertView == null) { 
convertView = inflater.inflate(R.layout.picture_item, null); 
viewHolder = new ViewHolder(); 
viewHolder.title = (TextView) convertView.findViewById(R.id.title); 
viewHolder.image = (ImageView) convertView.findViewById(R.id.image); 
convertView.setTag(viewHolder); 
} else { 
viewHolder = (ViewHolder) convertView.getTag(); 
} 
viewHolder.title.setText(pictures.get(position).getTitle()); 
viewHolder.image.setImageBitmap(BitmapFactory.decodeFile(pictures.get( 
position).getImageId())); 
return convertView; 
} 

} 

class ViewHolder { 
public TextView title; 
public ImageView image; 
}

　　

picture的javabean

//  
  
package com.su.testgrid3;  
  
class Picture {  
    private String title;  
    private String imageId;  
  
    public Picture() {  
        super();  
    }  
  
    public Picture(String title, String imageId) {  
        super();  
        this.title = title;  
        this.imageId = imageId;  
    }  
  
    public String getTitle() {  
        return title;  
    }  
  
    public void setTitle(String title) {  
        this.title = title;  
    }  
  
    public String getImageId() {  
        return imageId;  
    }  
  
    public void setImageId(String imageId) {  
        this.imageId = imageId;  
    }  
}  

　　

获取图片文件的名字数组的操作类

   
package com.su.testgrid3;  
  
import java.io.File;  
  
public class FileUtil {  
    public static String[] getImageNames(String folderPath) {  
        File file01 = new File(folderPath);  
  
        String[] files01 = file01.list();  
  
        int imageFileNums = 0;  
        for (int i = 0; i < files01.length; i++) {  
            File file02 = new File(folderPath + "/" + files01);  
  
            if (!file02.isDirectory()) {  
  
                if (isImageFile(file02.getName())) {  
  
                    imageFileNums++;  
                }  
            }  
        }  
  
        String[] files02 = new String[imageFileNums];  
  
        int j = 0;  
        for (int i = 0; i < files01.length; i++) {  
            File file02 = new File(folderPath + "/" + files01);  
  
            if (!file02.isDirectory()) {  
  
                if (isImageFile(file02.getName())) {  
                    files02[j] = file02.getName();  
                    j++;  
                }  
            }  
        }  
        return files02;  
    }  
  
    private static boolean isImageFile(String fileName) {  
        String fileEnd = fileName.substring(fileName.lastIndexOf(".") + 1,  
                fileName.length());  
        if (fileEnd.equalsIgnoreCase("jpg")) {  
            return true;  
        } else if (fileEnd.equalsIgnoreCase("png")) {  
            return true;  
        } else if (fileEnd.equalsIgnoreCase("bmp")) {  
            return true;  
        } else {  
            return false;  
        }  
    }  
  
}  

　　附源码：

 https://files.cnblogs.com/feifei1010/%E5%8A%A8%E6%80%81%E7%9A%84%E4%BB%8Esd%E5%8D%A1%E8%AF%BB%E5%8F%96%E7%9A%84TestGrid3.zip

参考资料：

http://www.apkbus.com/android-58470-1-1.html

http://www.cnblogs.com/lamapig/archive/2011/08/18/2145006.html

 

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