Question

I’m trying to launch an image which is written to my application directory with the builtin Android image viewer. This image has been written in a different part of the app to the app directory. When getting the following file:

super.getFilesDir() + "/current.png"

File.exists() returns true.

How can i launch the builtin Android image viewer to view this file?
Currently i’m doing:

File f = new File(super.getFilesDir()+"/current.png");
uri = Uri.parse("file://"+super.getFilesDir()+"/current.png");
startActivity(new Intent(Intent.ACTION_VIEW, uri));

And it keeps churning out:

10-11 13:09:24.367:
INFO/ActivityManager(564): Starting
activity: Intent {
act=android.intent.action.VIEW
dat=file:///data/data/com.davidgoemans.myapp/files/current.png
} 10-11 13:09:24.367:
ERROR/myapp(2166): Exception
occuredandroid.content.ActivityNotFoundException:
No Activity found to handle Intent {
act=android.intent.action.VIEW
dat=file:///data/data/com.davidgoemans.myapp/files/current.png
}

irrespective of what i change the uri schema to ( eg, content://, file://, media://, image:// ).

Answer 1

One way is to implement a context provider to give other applications access to your data.

Create a new class containing:

public class FileContentProvider extends ContentProvider {
   private static final String URI_PREFIX = "content://uk.co.ashtonbrsc.examplefilecontentprovider";

   public static String constructUri(String url) {
       Uri uri = Uri.parse(url);
       return uri.isAbsolute() ? url : URI_PREFIX + url;
   }

   @Override
   public ParcelFileDescriptor openFile(Uri uri, String mode) throws FileNotFoundException {
       File file = new File(uri.getPath());
       ParcelFileDescriptor parcel = ParcelFileDescriptor.open(file, ParcelFileDescriptor.MODE_READ_ONLY);
       return parcel;
   }

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

   @Override
   public int delete(Uri uri, String s, String[] as) {
       throw new UnsupportedOperationException("Not supported by this provider");
   }

   @Override
   public String getType(Uri uri) {
   throw new UnsupportedOperationException("Not supported by this provider");
   }

   @Override
   public Uri insert(Uri uri, ContentValues contentvalues) {
       throw new UnsupportedOperationException("Not supported by this provider");
   }

   @Override
   public Cursor query(Uri uri, String[] as, String s, String[] as1, String s1) {
       throw new UnsupportedOperationException("Not supported by this provider");
   }

   @Override
   public int update(Uri uri, ContentValues contentvalues, String s, String[] as) {
       throw new UnsupportedOperationException("Not supported by this provider");
   }

}

Add the content provider to your AndroidManifest.xml:

<provider android:name=".FileContentProvider" android:authorities="uk.co.ashtonbrsc.examplefilecontentprovider" />

You should then be able to use "content://uk.co.ashtonbrsc.examplefilecontentprovider/" + the full path to the image in your ACTION_VIEW intent.