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Ibrahim Hernández Jorge
Asked: 2020-04-24 10:18:49 +0800 CST 2020-04-24 10:18:49 +0800 CST

Pixelated image when taking photo Android

  • 772

I have an application in which I use the camera, the problem is that when I take the photo, the pixelated image appears in the preview of the Android camera application, here is an example:

enter image description here

I access the camera like this:

val takePictureIntent = Intent(MediaStore.ACTION_IMAGE_CAPTURE)
startActivityForResult(takePictureIntent, TAKE_PICTURE)

As I say, it is in the camera application itself where the image is pixelated, not in my application, where I later receive the image in this way as well.

android

1 Answers

  1. Best Answer

    The problem here is that if you unfold the image at the time of taking it, a low quality image is generated. When using the camera to save images, it is recommended to save it to the disk and later you can get it from the disk and it will be displayed with good quality.

    Remember that for Android 6.0 you must require the permission WRITE_EXTERNAL_STORAGEmanually, in addition to defining it in your fileAndroidManifest.xml

    Storage permission error

    enter image description here

    I add a complete example:

    public class MainActivity extends AppCompatActivity {

    private static final int PICTURE_RESULT = 122 ;
    private ContentValues values;
    private Uri imageUri;
    private Button myButton;
    private ImageView myImageView;
    private Bitmap thumbnail;

    String imageurl;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M){
            //Verifica permisos para Android 6.0+
            if(!checkExternalStoragePermission()){
                return;
            }
        }

        myImageView = (ImageView)findViewById(R.id.myImageView);
        myButton = (Button)findViewById(R.id.myButton);
            myButton.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {

                    values = new ContentValues();
                    values.put(MediaStore.Images.Media.TITLE, "MyPicture");
                    values.put(MediaStore.Images.Media.DESCRIPTION, "Photo taken on " + System.currentTimeMillis());
                    imageUri = getContentResolver().insert(
                            MediaStore.Images.Media.EXTERNAL_CONTENT_URI, values);
                    Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
                    intent.putExtra(MediaStore.EXTRA_OUTPUT, imageUri);
                    startActivityForResult(intent, PICTURE_RESULT);    
                }
            });

    }


    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        switch (requestCode) {
            case PICTURE_RESULT:
                if (requestCode == PICTURE_RESULT)
                    if (resultCode == Activity.RESULT_OK) {
                        try {
                            thumbnail = MediaStore.Images.Media.getBitmap(getContentResolver(), imageUri);
                            myImageView.setImageBitmap(thumbnail);
                            //Obtiene la ruta donde se encuentra guardada la imagen.
                            imageurl = getRealPathFromURI(imageUri);
                        } catch (Exception e) {
                            e.printStackTrace();
                        }

                    }
        }
    }

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

    private boolean checkExternalStoragePermission() {
        int permissionCheck = ContextCompat.checkSelfPermission(
                this, Manifest.permission.WRITE_EXTERNAL_STORAGE);
        if (permissionCheck != PackageManager.PERMISSION_GRANTED) {
            Log.i("Mensaje", "No se tiene permiso para leer.");
            ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE}, 225);
        } else {
            Log.i("Mensaje", "Se tiene permiso para leer!");
            return true;
        }

        return false;
    }


}
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