Change Layout through other Activity

Question

Is there a way that I can change ImageView of Main.class class through Gallery.class?

my Main class onClick calls the method setImage of Gallery.class

public void setImage(int currentView) {

    Log.d("fgdsf","dumaan dito");
    this.currentView = currentView;
    Intent gallery = new Intent(Intent.ACTION_PICK,
            android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
    startActivityForResult(gallery, RESULT_LOAD_IMAGE);

}

and this is the onActivityResult

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);

    if (requestCode == RESULT_LOAD_IMAGE && resultCode == RESULT_OK
            && null != data) {
        Uri selectedImage = data.getData();
        String[] filePathColumn = { MediaStore.Images.Media.DATA };

        Cursor cursor = getContentResolver().query(selectedImage,
                filePathColumn, null, null, null);
        cursor.moveToFirst();

        int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
        String picturePath = cursor.getString(columnIndex);
        cursor.close();

        LayoutInflater inflater = (LayoutInflater) mActivity
                .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        View v = inflater.inflate(R.layout.activity_main, null);

        if (currentView == 0) {
            ImageView imageView = (ImageView) v
                    .findViewById(R.id.imageView1);
            imageView.setImageBitmap(BitmapFactory.decodeFile(picturePath));
        } 
        if(currentView==1)
        {
            ImageView imageView = (ImageView) v
                    .findViewById(R.id.imageView2);
            imageView.setImageBitmap(BitmapFactory.decodeFile(picturePath));
        }

    }
}

and I get this error

08-07 08:35:08.208: E/AndroidRuntime(15689): Caused by: java.lang.NullPointerException 08-07 08:35:08.208: E/AndroidRuntime(15689): at android.app.Activity.startActivityForResult(Activity.java:3370)

Answer 1

I don't think you can. You can only control the layout of your current activity, along with its components. Since the component isn't on the view of your current Activity (in your case is Gallery), accessing it will throw the NullPointerException. What you can do is, pass the path of the selected image on you Gallery to the Main class then retrieve the image path and set it to your ImageView.

Answer 2

I think your best option is to set an interface in Gallery.class, like

public class Gallery extends Activity {

    public interface MyClickListener {
        public void OnClick();
    }

    private MyClickListener listener;

Then in your onClick, set your OnClick ( listener.OnClick() ). In Main.class you will have to import 'MyClickListener' and define whatever actions you want to perform.

Answer 3

For capture Image

This is happens from android 4.0 onward

Before it was returning the image uri path, but now it returns Bitmap from gallery.

So to resolve this.

File file = new File(Environment.getExternalStorageDirectory() + "/DCIM/", "image" + new Date().getTime() + ".jpg");

Uri imgUri = Uri.fromFile(file);
String imagepath = file.getAbsolutePath();

final Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
intent.putExtra(MediaStore.EXTRA_OUTPUT, imagepath);
startActivityForResult(intent, CAPTURE_IMAGE);


@Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        if (resultCode != Activity.RESULT_CANCELED) {
            if (requestCode == CAPTURE_IMAGE) {
                imgUser.setImageBitmap(BitmapFactory.decodeFile(imagepath);
            } else {
                super.onActivityResult(requestCode, resultCode, data);
            }
        }

    }

For Pick Image From Gallary

Intent intent = new Intent();
intent.setType("image/*");
intent.setAction(Intent.ACTION_GET_CONTENT);
startActivityForResult(Intent.createChooser(intent, ""), PICK_IMAGE);


public String getAbsolutePath(Uri uri) {
        String[] projection = { MediaColumns.DATA };
        @SuppressWarnings("deprecation")
        Cursor cursor = managedQuery(uri, projection, null, null, null);
        if (cursor != null) {
            int column_index = cursor.getColumnIndexOrThrow(MediaColumns.DATA);
            cursor.moveToFirst();
            return cursor.getString(column_index);
        } else
            return null;
    }

@Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        if (resultCode != Activity.RESULT_CANCELED) {
            if (requestCode == PICK_IMAGE) {

           imgUser.setImageBitmap(BitmapFactory.decodeFile(getAbsolutePath(data.getData()));
            }  else {
                super.onActivityResult(requestCode, resultCode, data);
            }
        }

    }