从内部存储共享图像

Question

I've been trying and trying to get this to work. I've gone through many examples with no luck. The problem is that the image is not attached when I try to share it, for example, using an email client. I managed to get this to work when using external storage but internal storage suits my needs better.

I click a button and then the image is saved to internal storage and right after that it is shared but there's no image.

This is from the Activity class:

int width              = size.x;
int height             = size.y;
Bitmap shareBmp        = Bitmap.createBitmap(screenBmp, 0, 0, width, height);
ContextWrapper wrapper = new ContextWrapper(getApplicationContext());
File directory         = wrapper.getDir("images", Context.MODE_PRIVATE);
File filePath          = new File(directory, "share.png");

FileOutputStream fos;

try
{
    fos = new FileOutputStream(filePath);
    shareBmp.compress(Bitmap.CompressFormat.PNG, 90, fos);
    fos.close();
}
catch (Exception aE){}

Uri uri       = Uri.parse("content://com.example.Test/share.png");
Intent intent = new Intent();

intent.setAction(Intent.ACTION_SEND);
intent.putExtra(Intent.EXTRA_STREAM, uri);
intent.setType("image/png");
startActivity(Intent.createChooser(intent, "Share Image"));

Here's the ImageProvider class:

public class ImageProvider extends ContentProvider
{
    @Override
    public ParcelFileDescriptor openFile(Uri aUri, String aMode) throwsFileNotFoundException
    {
        File file = new File(getContext().getFilesDir(), aUri.getPath());

        if (file.exists())
        {
            return (ParcelFileDescriptor.open(file, ParcelFileDescriptor.MODE_READ_ONLY));
        }

        throw new FileNotFoundException(aUri.getPath());
    }

    @Override
    public boolean onCreate()
    {
        return false;
    }

    @Override
    public int delete(Uri aUri, String aSelection, String[] aSelectionArgs)
    {
        return 0;
    }

    @Override
    public String getType(Uri aUri)
    {
        return null;
    }

    @Override
    public Uri insert(Uri aUri, ContentValues aValues)
    {
        return null;
    }

    @Override
    public Cursor query(Uri aUri, String[] aProjection, String aSelection, String[] aSelectionArgs, String aSortOrder)
    {
        return null;
    }

    @Override
    public int update(Uri aUri, ContentValues aValues, String aSelection, String[] aSelectionArgs)
    {
        return 0;
    }
}

This is from the manifest:

<provider
        android:name=".ImageProvider"
        android:authorities="com.example.Test"
        android:exported="true"/>

Answer 1

Only your app can see/read/write files in it's app specific -private- storage. So you cannot ask other app to share from it as they cannot even 'see' those files there.