android - 列出 SD 卡中的所有图像

Question

您好，我正在开发 android Gallery 应用程序。我正在从 SD 卡中的文件夹中获取图像并将其显示在 GridView 中，如下所示

public static ArrayList<String> getFilePaths(){
    ArrayList<String> filePaths = new ArrayList<String>();
    File directory = new File(android.os.Environment.getExternalStorageDirectory() 
             + File.separator + AppConstant.PHOTO_ALBUM);

    // check for directory
    if (directory.isDirectory()){
        // getting list of file paths
        File[] listFiles = directory.listFiles();

        // Check for count
        if (listFiles.length > 0) {
            for (int i = 0; i < listFiles.length; i++){

                String filePath = listFiles[i].getAbsolutePath();

                if (IsSupportedFile(filePath)){
                    // Add image path to array list
                    filePaths.add(filePath);
                }
            }
        }else{
            // image directory is empty
            Toast.makeText(_context,
                    AppConstant.PHOTO_ALBUM
                    + " is empty. Please load some images in it !",
                    Toast.LENGTH_LONG).show();
        }

    } 
    return filePaths;
}

//fetching all image paths
 imagePaths = utils.getFilePaths();
 adapter = new GridViewImageAdapter(GridViewActivity.this, imagePaths, columnWidth);
 // setting grid view adapter
 gridView.setAdapter(adapter);

我想显示 SD 卡中的所有图像，而不仅仅是在指定的文件夹中。我不确定该怎么做。

请帮助。谢谢!

Answer 1

使用此方法。这将返回您的 SD 卡中所有图像路径的列表，如果您不想要任何指定的图像扩展名，您可以将其过滤掉。

public ArrayList<String> getFilePaths()
    {


        Uri u = MediaStore.Images.Media.EXTERNAL_CONTENT_URI; 
        String[] projection = {MediaStore.Images.ImageColumns.DATA}; 
        Cursor c = null;
        SortedSet<String> dirList = new TreeSet<String>();
        ArrayList<String> resultIAV = new ArrayList<String>();

         String[] directories = null; 
        if (u != null) 
        { 
            c = managedQuery(u, projection, null, null, null); 
        } 

        if ((c != null) && (c.moveToFirst())) 
        { 
            do 
            {
                String tempDir = c.getString(0);
                tempDir = tempDir.substring(0, tempDir.lastIndexOf("/"));
                try{
                    dirList.add(tempDir);
                }
                catch(Exception e)
                {

                }
            } 
            while (c.moveToNext());
            directories = new String[dirList.size()];
            dirList.toArray(directories);

        }

        for(int i=0;i<dirList.size();i++)
        {
            File imageDir = new File(directories[i]);
            File[] imageList = imageDir.listFiles();
            if(imageList == null)
                continue;
            for (File imagePath : imageList) { 
                try {

                        if(imagePath.isDirectory())
                        {
                            imageList = imagePath.listFiles();

                        }
                        if ( imagePath.getName().contains(".jpg")|| imagePath.getName().contains(".JPG")  
                                || imagePath.getName().contains(".jpeg")|| imagePath.getName().contains(".JPEG")                                    
                                || imagePath.getName().contains(".png") || imagePath.getName().contains(".PNG")
                                || imagePath.getName().contains(".gif") || imagePath.getName().contains(".GIF")
                                || imagePath.getName().contains(".bmp") || imagePath.getName().contains(".BMP")                         
        )
                        {



                            String path= imagePath.getAbsolutePath();
                        resultIAV.add(path);

                        }
                    }
            //  }
            catch (Exception e) {
                    e.printStackTrace();
                }
            }
        }

        return resultIAV;


    }