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UserNameYo
Asked: 2020-01-04 12:42:59 +0800 CST 2020-01-04 12:42:59 +0800 CST

Why doesn't it create the .png of the selected image in the Gallery?

  • 772

Why doesn't it create the .png I'm trying to get it to create from the selected image?

public class ClaseNueva extends Activity {

    private ImageView imagenPersona;
    private int SELECCIONAR_IMAGEN = 237487;
    private Uri pathImagenUri;

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

        imagenPersona = (ImageView) findViewById(R.id.imagenPersona);


        imagenPersona.setOnClickListener(new OnClickListener() {
            public void onClick(View v) {
                ventanaImagen();
            }
        });
    }

    private void ventanaImagen() {
        try {
            final CharSequence[] items = {"Seleccionar de la galería"};

            AlertDialog.Builder builder = new AlertDialog.Builder(this);
            builder.setTitle("Seleccionar una foto");
            builder.setItems(items, new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialog, int item) {
                    switch (item) {
                        case 0:
                            Intent intentSeleccionarImagen = new Intent(Intent.ACTION_PICK, android.provider.MediaStore.Images.Media.INTERNAL_CONTENT_URI);
                            intentSeleccionarImagen.setType("image/*");
                            startActivityForResult(intentSeleccionarImagen, SELECCIONAR_IMAGEN);
                            break;
                    }
                }
            });
            AlertDialog alert = builder.create();
            alert.show();
        } catch (Exception e) {
        }
    }

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

        if (requestCode == SELECCIONAR_IMAGEN && resultCode == Activity.RESULT_OK) {
            if (pathImagenUri != null) {

                File dir = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DCIM);
                File file = new File(dir, "resized_image.png");

                Uri imagenSeleccionada = pathImagenUri;
                Bitmap bitmap = getBitmap(pathImagenUri.getPath());

                if (bitmap != null) { //Bitmap no es null?

                    //Redimnsiona imagen.
                    Bitmap bitmapout = Bitmap.createScaledBitmap(bitmap, 150, 150, false);
                    FileOutputStream fOut = null;
                    try {
                        fOut = new FileOutputStream(file);
                    } catch (FileNotFoundException e) {
                        e.printStackTrace();
                    }
                    bitmapout.compress(Bitmap.CompressFormat.PNG, 100, fOut);
                    try {
                        fOut.flush();
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                    try {
                        fOut.close();
                    } catch (IOException e) {
                        e.printStackTrace();
                    }


                } else {
                    Toast.makeText(this, "Error obteniendo imagen", Toast.LENGTH_LONG).show();
                }
            } else {
                Toast.makeText(this, "Error obteniendo imagen", Toast.LENGTH_LONG).show();
            }
        }
    }

    private Bitmap getBitmap(String ruta_imagen) {
        File imagenArchivo = new File(ruta_imagen);
        Bitmap bitmap = null;
        if (imagenArchivo.exists()) {
            bitmap = BitmapFactory.decodeFile(imagenArchivo.getAbsolutePath());
        }
        return bitmap;
    }
}

I don't get any errors, it just doesn't get created, why is that?

java

2 Answers

  1. Best Answer

    If you use startActivityForResult()when receiving the image data through the bundle in onActivityResult(), you can get the path in this way create the bitmap, resize it and save it in another path (variable nuevaRutaArchivo);

    private static final String TAG = "MainActivity";
private ImageView imagenPersona;
private Uri pathImagenUri;
private int PICK_IMAGE_REQUEST = 1;


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


    if (requestCode == PICK_IMAGE_REQUEST && resultCode == RESULT_OK && data != null && data.getData() != null) {

        Uri uri = data.getData();

        try {
            Bitmap bitmap = MediaStore.Images.Media.getBitmap(getContentResolver(), uri);


            /*//Muestra imagen seleccionada de galería en ImageView.
            ImageView imageView = (ImageView) findViewById(R.id.imagenPersona);
            imageView.setImageBitmap(bitmap);*/

            //Define path donde sera guardada una nueva imagen con medidas 150x150px
            File dir = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DCIM);
            File file = new File(dir, "resized_jorgesys.png");

            if (!file.exists()) { //Si archivo no existe.
                try {
                    file.createNewFile(); //Procede a crearlo.
                } catch (IOException e) {
                    Log.e(TAG, e.getMessage());
                }
            }

            if (bitmap != null) {

                //Redimensiona imagen.
                Bitmap bitmapout = Bitmap.createScaledBitmap(bitmap, 150, 150, false);
                FileOutputStream fOut = null;
                try {
                    fOut = new FileOutputStream(file);
                    bitmapout.compress(Bitmap.CompressFormat.PNG, 100, fOut);
                    fOut.flush();
                    fOut.close();
                } catch (FileNotFoundException e) {
                    e.printStackTrace();
                } catch (IOException e) {
                    Log.e(TAG, e.getMessage());
                }

                //Muestra imagen con nuevas medidas en ImageView.
                ImageView imageView = (ImageView) findViewById(R.id.imagenPersona);
                imageView.setImageBitmap(bitmapout);

            } else {
                Toast.makeText(this, "Error obteniendo imagen", Toast.LENGTH_LONG).show();
            }




        } catch (IOException e) {
            Log.e(TAG, e.getMessage());
        }


    }
}

    At the end the image with new measure is added to the ImageView:

    enter image description here

    • 3

  2. There is the function:

     miImagen.getScaledInstance(anchuraNueva, alturaNueva, Image.SCALE_DEFAULT);

    The last parameter is the algorithm that is followed to do the resizing.

    This using the swing package .

    JavaDoc for more information.

    • 1