Share image from SD Card

问题:

I'm trying for 2 weeks to find how to share images which are stored on an SD card with no success.

This answer doesn't work to me, nor is it what I'm looking for.

I'm working with Cam Preview app that stores images to SD and then display them in in-app gallery:

   public class GalleryView extends Activity {  

   private static final int SELECT_PICTURE = 1;

private String selectedImagePath;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.gallery_view);

    Gallery g = (Gallery) findViewById(R.id.gallery);
    g.setAdapter(new ImageAdapter(this, ReadSDCard()));


    g.setOnItemClickListener(new OnItemClickListener() {
        public void onItemClick(AdapterView<?> parent, View v, int position, long id) {
    Intent intent = new Intent();
            intent.setType("image/*");
            intent.setAction(Intent.ACTION_GET_CONTENT);
            startActivityForResult(Intent.createChooser(intent, "Select Picture"), SELECT_PICTURE);
        }
    });
}

  public void onActivityResult(int requestCode, int resultCode, Intent data) {
    if (resultCode == RESULT_OK) {
        if (requestCode == SELECT_PICTURE) {
            Uri selectedImageUri = data.getData();
            selectedImagePath = getPath(selectedImageUri);

            Intent shareIntent = new Intent();
            shareIntent.setAction(Intent.ACTION_SEND);
            shareIntent.putExtra(Intent.EXTRA_STREAM, selectedImagePath);
            shareIntent.setType("image/*");
            startActivity(Intent.createChooser(shareIntent, "Share image"));
        }
    }
}

public String getPath(Uri uri) {
    String[] projection = { MediaStore.Images.Media.DATA };
    Cursor cursor = managedQuery(uri, projection, null, null, null);
    int column_index = cursor
            .getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
    cursor.moveToFirst();
    return cursor.getString(column_index);
}

@Override
public void onDestroy() {
    super.onDestroy();       
}

private List<String> ReadSDCard() {

    createDirIfNotExists();

    List<String> tFileList = new ArrayList<String>();

    //It have to be matched with the directory in SDCard
    File f = new File("/sdcard/Cam App");

    File[] files=f.listFiles();

    for(int i=0; i<files.length; i++) {
        File file = files[i];
        /*It's assumed that all file in the path are in supported type*/
        tFileList.add(file.getPath());
    }

    return tFileList;
}

class ViewHolder {
    ImageView i;
}

public class ImageAdapter extends BaseAdapter {
    int mGalleryItemBackground;
    private Context mContext;
    private List<String> FileList;
    LayoutInflater inflater = getLayoutInflater();
    ViewHolder holder;

    public ImageAdapter(Context c, List<String> fList) {
        mContext = c;
        FileList = fList;
        TypedArray a = obtainStyledAttributes(R.styleable.GalleryTheme);
        mGalleryItemBackground = a.getResourceId(R.styleable.GalleryTheme_android_galleryItemBackground, 0);
        a.recycle();
    }

    public int getCount() {
        return FileList.size();
    }

    public Object getItem(int position) {
        return position;
    } 

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

    public View getView(int position, View convertView, ViewGroup parent) {
        ImageView i = new ImageView(mContext);

        Bitmap bm = BitmapFactory.decodeFile(FileList.get(position).toString());
        i.setImageBitmap(bm);

        if (convertView == null) {
            convertView = inflater.inflate(R.layout.gallery_item, parent, false);

            holder = new ViewHolder();
            holder.i = ((ImageView) convertView.findViewById(R.id.imagenGallery));

            convertView.setTag(holder);
        }
        holder.i.setScaleType(ImageView.ScaleType.FIT_XY);
        holder.i.setBackgroundResource(mGalleryItemBackground);

        return i;
    }
}

public TypedArray obtainStyledAttributes(int theme) {
    // TODO Auto-generated method stub
    return null;
}
}

The gallery works fine, but I don't get how to share the images saved on the SD.

How to access that images in Cam App folder and share the image that appears in that moment in the gallery?

I tried to use positions, but it only works with constant images. Any help/tips would be appreciated.

回答1:

Well, I finally found a solution to this, but it's not exactly what I want:

g.setOnItemClickListener(new OnItemClickListener() {
        public void onItemClick(AdapterView<?> parent, View v, int position, long id) {

            Intent intent = new Intent();
            intent.setAction(Intent.ACTION_GET_CONTENT);
            intent.setDataAndType(Uri.parse("file://" + "/sdcard/Cam App"), "image/*");
            startActivityForResult(Intent.createChooser(intent, "Select image to share:"), SELECT_PICTURE);
        }
    });
}

public void onActivityResult(int requestCode, int resultCode, Intent data) {
    if (resultCode == RESULT_OK) {
        if (requestCode == SELECT_PICTURE) {
            Uri selectedImageUri = data.getData();
            //OI FILE Manager
            filemanagerstring = selectedImageUri.getPath();

            //MEDIA GALLERY
            selectedImagePath = getPath(selectedImageUri);

            //NOW WE HAVE OUR WANTED STRING
            if(selectedImagePath!=null)
                System.out.println("selectedImagePath is the right one for you!");
            else
                System.out.println("filemanagerstring is the right one for you!");

            Intent shareIntent = new Intent();
            shareIntent.setAction(Intent.ACTION_SEND);
            shareIntent.putExtra(Intent.EXTRA_STREAM, selectedImageUri);
            shareIntent.setType("image/*");
            startActivity(Intent.createChooser(shareIntent, "Share image via:"));
        }
    }
}

@SuppressWarnings("deprecation")
public String getPath(Uri uri) {
    String[] projection = { MediaStore.Images.Media.DATA };
    Cursor cursor = managedQuery(uri, projection, null, null, null);
    if(cursor!=null) {
        //HERE YOU WILL GET A NULLPOINTER IF CURSOR IS NULL
        //THIS CAN BE, IF YOU USED OI FILE MANAGER FOR PICKING THE MEDIA
        int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
        cursor.moveToFirst();
        return cursor.getString(column_index);
    }
    else return null;
}

If somebody has any better solution, please share.

回答2:

The following code works fine, If you know the path of that image

Intent shareit=new Intent(Intent.ACTION_SEND);
shareit.setType("image/jpeg");
File f = new File("imagepath");
shareit.putExtra(Intent.EXTRA_STREAM, Uri.fromFile(f));
startActivity(Intent.createChooser(shareit, "Share Image Via"));

Create the file with image file name,

File f = new File(Environment.getExternalStorageDirectory() + File.separator + "image_file.jpg");