I have an application in which I use the camera, the problem is that when I take the photo, in the preview of the Android camera application I see the pixelated image, here an example:
I access the camera in this way:
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 also in this way.
The problem here is that if you display the image when you take it, a low quality image is generated. When using the camera to save images, it is advisable to save it on the disk and later you can obtain it from the disk and it will be displayed with good quality.
Remember that for Android 6.0 you must manually require WRITE_EXTERNAL_STORAGE , in addition to defining it in your file AndroidManifest.xml
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;
}
}