从SD卡中特定文件夹以网格视图显示图像

Question

从SD卡中特定文件夹以网格视图显示图像

3

我开发了一个应用程序，需要从sd卡中的特定文件夹中显示图像。我的代码可以正常工作，但它会显示sd卡中的所有图像。我已经按照以下帖子中的提到的方式提供了选择参数作为我的文件夹名字： Displaying images from a specific folder on the SDCard using a gridview 但是它没有起作用。请建议我如何做到这一点：

下面是我发布的代码。

public class Album1Activity extends Activity {
static Cursor imageCursor;
static int columnIndex;
GridView gridView;
Intent in;
protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);
    setContentView(R.layout.grid);
    String[] imgColumnID = {MediaStore.Images.Thumbnails._ID};
    Uri uri = MediaStore.Images.Thumbnails.EXTERNAL_CONTENT_URI;
    imageCursor = managedQuery(uri, imgColumnID, null, null, 
                    MediaStore.Images.Thumbnails.IMAGE_ID);
    columnIndex = imageCursor.getColumnIndexOrThrow(MediaStore.Images.Thumbnails._ID);
    gridView = (GridView)findViewById(R.id.gridview);
    gridView.setAdapter(new ImageAdapter(getApplicationContext()));
    gridView.setOnItemClickListener(new OnItemClickListener() {

        public void onItemClick(AdapterView<?> parent, View v, int position,
                long id) {
            String[] dataLocation = {MediaStore.Images.Media.DATA};
            //String []dataLocation = {Environment.getExternalStorageDirectory().getAbsolutePath()};
            imageCursor = managedQuery(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, 
                        dataLocation, null, null, null);
            columnIndex = imageCursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
            imageCursor.moveToPosition(position);
            String imgPath = imageCursor.getString(columnIndex);
            in = new Intent(getApplicationContext(), FullScreen.class);
            in.putExtra("id", imgPath);
            startActivity(in);
        }//onItemClickListener
    });
}//onCreate

public static class ImageAdapter extends BaseAdapter{
    private Context context;
    //Album1Activity act = new Album1Activity();
    public ImageAdapter(Context context){
        this.context = context;
    }//ImageAdapter
    public int getCount() {
        // TODO Auto-generated method stub
        return imageCursor.getCount();
    }//getCount

    public Object getItem(int position) {
        // TODO Auto-generated method stub
        return position;
    }//getItem

    public long getItemId(int position) {
        // TODO Auto-generated method stub
        return position;
    }//getItemId

    public View getView(int position, View convertView, ViewGroup parent) {
        ImageView iv;
        if(convertView == null){
            iv = new ImageView(context);
            imageCursor.moveToPosition(position);
            int imageID = imageCursor.getInt(columnIndex);
            iv.setImageURI(Uri.withAppendedPath(MediaStore.Images.Thumbnails.EXTERNAL_CONTENT_URI,
                            "" +imageID));
            iv.setScaleType(ImageView.ScaleType.FIT_XY);
            iv.setPadding(5, 5, 5, 5);
            iv.setLayoutParams(new GridView.LayoutParams(100, 100));
        }//if
        else{
            iv = (ImageView)convertView;
        }//else
        return iv;
    }//getView

}//ImageAdapter

}//Album1Activity

- Nitish

4个回答

1

你可以使用

Uri.parse("path to sdcard folder")

方法。该方法与IT相关。

- NullPointerException

0

你的链接答案已经有了答案。正确使用选择参数。

cursor = managedQuery( MediaStore.Images.Media.EXTERNAL_CONTENT_URI,
    projection, 
    MediaStore.Images.Media.DATA + " like ? ",
    **new String[] {"%myimagesfolder%"},**  
    null);

- Tarun

0

在上面的代码中，您正在从图库中获取所有图像，请尝试这个。

File sdImageMainDirectory ;
String imageName ;
File root = new File(Environment.getExternalStorageDirectory()
                + File.separator + "MYPICS" + File.separator);
        if (!root.exists()) {
            root.mkdirs();
        }

ImageView camera = (ImageButton) findViewById(R.id.imageButton1);

cam.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                imageName = "MyPic.png";
                sdImageMainDirectory = new File(root, imageName);
                i++;
                Uri imgUri = Uri.fromFile(sdImageMainDirectory);

                Intent intent = new Intent(
                        android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
                intent.putExtra(MediaStore.EXTRA_OUTPUT, imgUri);
                startActivityForResult(intent, 0);

                // startCameraActivity();
            }
        });

@Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        switch (resultCode) {
        case 0:
             finish();
            break;

        case -1:
            files = root.listFiles();
            count = files.length;
            try {

                ImageView image = new ImageView(this);

                LinearLayout.LayoutParams vp = new LinearLayout.LayoutParams(
                        200, 200);
                image.setLayoutParams(vp);
                image.setScaleType(ImageView.ScaleType.CENTER_CROP);
                image.setPadding(8, 8, 8, 8);
                image.setMaxHeight(50);
                image.setMaxWidth(50);
                image.setAdjustViewBounds(true);
                BitmapFactory.Options option = new BitmapFactory.Options();
                option.inSampleSize = 2;
                Bitmap bm = BitmapFactory.decodeFile(root.getPath() + "/"
                        + imageName,option);
                image.setImageBitmap(bm);
                linearImageView.addView(image);


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



        }

    }

- Sachin Gurnani

你的代码只显示MYPICS文件夹中的文件，对吗？ - Huy Tower

是的，但您可以根据自己的需求进行更改。 - Sachin Gurnani

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- Nitish · Accepted Answer

很抱歉回复晚了... 以下是最终解决方案

public class Album3 extends Activity {
File [] mediaFiles;
File imageDir;
static GridView gridView;
ImageAdapter adapter;
Intent in;
ImageButton btncam;
String name = null;
ArrayList<Bitmap> bmpArray = new ArrayList<Bitmap>();
ArrayList<String> fileName = new ArrayList<String>();
public static final String TAG = "Album3Activity";

public void onCreate(Bundle savedInstanceState) 
{
    imageDir = new File(Environment.getExternalStorageDirectory().toString()+
             "/diplomat");
    super.onCreate(savedInstanceState);
    if((imageDir.exists()))
    {
        requestWindowFeature(Window.FEATURE_NO_TITLE);
        setContentView(R.layout.grid);
        mediaFiles = imageDir.listFiles();
        //Log.d("Length of images",""+mediaFiles.length);
        for(File file : mediaFiles)
        {
            bmpArray.add(convertToBitmap(file));
            fileName.add(readFileName(file));
            //Log.d(TAG + "bmpArray Size", ""+bmpArray.size());
            //Log.d(TAG, "call to convertToBitmap");
        }//for

        adapter = new ImageAdapter(this, bmpArray, fileName);
        gridView = (GridView)findViewById(R.id.gridview);
        gridView.setAdapter(adapter);
        sendBroadcast(new Intent(Intent.ACTION_MEDIA_MOUNTED
                , Uri.parse(Environment.getExternalStorageDirectory().toString()+"/diplomat")));

        gridView.setOnItemClickListener(new OnItemClickListener() {

        public void onItemClick(AdapterView<?> arg0, View arg1, int position,
                long arg3) {
            in = new Intent(getApplicationContext(), FullScreen.class);
            in.putExtra("id", position);
            startActivity(in);
        }
    });
    }//if
    else
    {
        setContentView(R.layout.no_media);
    }
}//onCreate

public static Bitmap convertToBitmap(File file) 
{
    URL url = null;
    try 
    {
        url = file.toURL();
    } catch (MalformedURLException e1) 
    {
        //Log.d(TAG, e1.toString());
    }//catch

    Bitmap bmp = null;
    try
    {
       bmp = BitmapFactory.decodeStream(url.openStream());
       //bmp.recycle();
    }catch(Exception e)
    {
        //Log.d(TAG, "Exception: "+e.toString());
    }//catch
    return bmp;
}//convertToBitmap

public String readFileName(File file){
    String name = file.getName();
    return name;
}//readFileName
}//class