Develop Reference

Capture a custom image size with the camera or crop it

Am working on OCR system which is requiring to capture image and do OCR, i would like to capture part of the paper (Exact where intended text is) or crop captured image before passing it to OCR processing for better results.
I tried bellow code but i can't make it to what am trying to archive as am beginner to android java
private void startCameraActivity() {
try {
String IMGS_PATH = Environment.getExternalStorageDirectory().toString() + "/ocr/imgs";
prepareDirectory(IMGS_PATH);
String img_path = IMGS_PATH + "/ocr.jpg";
outputFileUri = Uri.fromFile(new File(img_path));
final Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
takePictureIntent.putExtra(MediaStore.EXTRA_OUTPUT, outputFileUri);
takePictureIntent.putExtra("crop", "true");
takePictureIntent.putExtra("scale", true);
takePictureIntent.putExtra("aspectX", 1);
takePictureIntent.putExtra("aspectY", 1);
takePictureIntent.putExtra("outputX", 150);
takePictureIntent.putExtra("outputY", 100);
if (takePictureIntent.resolveActivity(getPackageManager()) != null) {
startActivityForResult(takePictureIntent, PHOTO_REQUEST_CODE);
}
} catch (Exception e) {
Log.e(TAG, e.getMessage());
}
}
#Override
public void onActivityResult(int requestCode, int resultCode,
Intent data) {
//making photo
if (requestCode == PHOTO_REQUEST_CODE && resultCode == Activity.RESULT_OK) {
doOCR();
} else {
Toast.makeText(this, "ERROR: Image was not obtained.", Toast.LENGTH_SHORT).show();
}
}
private void doOCR() {
prepareTesseract();
startOCR(outputFileUri);
}
Am someone help me out here, Thanks.
NOTE
takePictureIntent.putExtra("crop", "true");
takePictureIntent.putExtra("scale", true);
takePictureIntent.putExtra("aspectX", 1);
takePictureIntent.putExtra("aspectY", 1);
takePictureIntent.putExtra("outputX", 150);
takePictureIntent.putExtra("outputY", 100);
After clearning my cache i noted the above code is opening complete action with apps which can crop image and everything is fine now.
Thanks.

SAF - ACTION_CREATE_DOCUMENT - after I save the file on Drive the file is empty

I am a beginner in SAF. What I'm trying to do is super simple to save a config. Let's say the file is .conf.
I copy .conf to conf.txt and I save it on Drive.
Here is my code:
tools.deleteFile(dst); // delete conf.txt if it exists
int res = tools.copyFile(src,dst); // copy .conf to conf.txt
if(res == -1) return;
tools.viewFile(dst);
// verify in Log info that the content of cnf.txt is correct
Intent intent = new Intent(Intent.ACTION_CREATE_DOCUMENT);
intent.addCategory(Intent.CATEGORY_OPENABLE);
intent.setType("text/plain");
intent.putExtra(Intent.EXTRA_TITLE, dst);
startActivity(intent);
I do a save in Drive. The file appears on my pc but when I open it, it's empty.
When I do the inverse: ACTION_OPEN_DOCUMENT
public void onActivityResult(int requestCode, int resultCode,
Intent resultData) {
Uri uri;
if (resultCode == Activity.RESULT_OK){
if (requestCode == 30){
if (resultData != null) {
uri = resultData.getData();
try {
String content =
readFile(uri);
} catch (IOException e) {
e.printStackTrace();
}
The function readFile opens the file and stops while reading because there is no data.
What did I do wrong?

The Intent(Intent.ACTION_CREATE_DOCUMENT) is for CREATING text file, and use onActivityResult() to get the uri (location) from the file, THEN you use OutputStream to WRITE data (byte[]) to the file.
private void createAndSaveFile() {
Intent intent = new Intent(Intent.ACTION_CREATE_DOCUMENT);
intent.addCategory(Intent.CATEGORY_OPENABLE);
intent.setType("text/plain");
intent.putExtra(Intent.EXTRA_TITLE, "testFileSam.txt");
startActivityForResult(intent, 1);
}
#Override
protected void onActivityResult(int requestCode, int resultCode, #Nullable Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == 1) {
if (resultCode == RESULT_OK) {
try {
Uri uri = data.getData();
OutputStream outputStream = getContentResolver().openOutputStream(uri);
outputStream.write("Hi, welcome to Sam's Android classroom! Have a good day!".getBytes());
outputStream.close();
Toast.makeText(this, "Write file successfully", Toast.LENGTH_SHORT).show();
} catch (IOException e) {
Toast.makeText(this, "Fail to write file", Toast.LENGTH_SHORT).show();
}
} else {
Toast.makeText(this, "File not saved", Toast.LENGTH_SHORT).show();
}
}
}

You are just creating the document but not writing it.
Intent intent = new Intent(Intent.ACTION_CREATE_DOCUMENT);
intent.addCategory(Intent.CATEGORY_OPENABLE);
intent.setType("text/plain");
intent.putExtra(Intent.EXTRA_TITLE, dst);
startActivity(intent);
this will create document and return the uri of the document to your app.
Now you need to write something to this uri that you will get in onActivityResult
#Override
protected void onActivityResult(int requestCode, int resultCode, #Nullable Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == 1) {
if (resultCode == RESULT_OK) {
try {
Uri uri = data.getData();
OutputStream outputStream = getContentResolver().openOutputStream(uri);
outputStream.write("Hi, welcome to Sam's Android classroom! Have a good day!".getBytes());
outputStream.close(); // very important
} catch (IOException e) {
e.printStackTrace();
}
}
}
}

Android photo cature error

I am trying to capture camera photo in may app...
this is what I have:
The photo is saved but on the on Activity Result, I get Null point Exception.
What could I be possible missing out?
private Uri getImgUri() {
File filePath= new File(Environment.getExternalStoragePublicDirectory (Environment.DIRECTORY_PICTURES),APP_ALIAS);
if(!filePath.exists()){
if(!filePath.mkdirs())
return null;
}
String timeStamp= new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
String path=filePath.getPath()+File.separator+"_IMG"+timeStamp+".jpg";
File file=new File(path);
return Uri.fromFile(file);
}
private void startGetPicFromCam() {
Intent intent= new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
Uri uri= getImgUri();
intent.putExtra(MediaStore.EXTRA_OUTPUT,uri);
startActivityForResult(intent,MEDIA_CAPTURE_RESULT_CODE);
}
#Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
// super.onActivityResult(requestCode, resultCode, data);
if(requestCode==MEDIA_CAPTURE_RESULT_CODE){
if(resultCode==RESULT_OK){
try{
if(data.getData()!=null)
Toast.makeText(this,"saved to "+data.getData(),Toast.LENGTH_LONG).show();
else
Toast.makeText(this,"saved to path",Toast.LENGTH_LONG).show();
}
catch(Exception e){
Toast.makeText(this,e.getMessage(),Toast.LENGTH_LONG).show();
}
}
}
}

Edit, it appears I didn't read your question close enough. It appears that the issue is that when you use EXTRA_OUTPUT, a null intent is passed back. If you want to get access to your data, just query the file that you passed in as an extra. See this and this question for more detailed information.

How to process a photo taken by an intent?

I'm completely news on android thing and unfortunately with little few time to learn it by the right way, I have a work to release.
The problem is: I need to take a picture and process her with an algorithm that I made.
I did it by the easiest way that I could find, I know it looks like really trahsie for those who really get android (sorry)
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
takePic();
protected void takePic(){
Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
startActivityForResult(takePictureIntent, 100);
}
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
Bundle extras = data.getExtras();
mImageBitmap = (Bitmap) extras.get("data");
Algorithm(mImageBitmap)
But it doesn't process, it takes a photo, ask to save or cancell and leaves the application, I have already made by different ways (creating a new activity), but nothing seems to work

Heres how I did it
To go to the camera:
Somewhere, declaire a fileUri variable and hold onto it
Uri fileUri;
final int TAKE_PICTURE=100;//this can be any int, really
public void goToCamera(){
Intent intent = new Intent("android.media.action.IMAGE_CAPTURE");
File photo;
try
{
// place where to store camera taken picture
photo = this.createTemporaryFile("picture", ".jpg");
Log.v(TAG, "Here(after createTempFile)");
photo.delete();
}
catch(Exception e)
{
Log.v(TAG, "Can't create file to take picture!" + e.getMessage());
Toast.makeText(context, "Please check SD card!", Toast.LENGTH_SHORT).show();
return;
}
fileUri = Uri.fromFile(photo);
intent.putExtra(MediaStore.EXTRA_OUTPUT, fileUri);
//Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
startActivityForResult(intent, TAKE_PICTURE);
}
Then to retreive the image
protected void onActivityResult(int requestCode, int resultCode, Intent data){
if (requestCode == TAKE_PICTURE && resultCode == RESULT_OK){
this.getContentResolver().notifyChange(uri, null);
ContentResolver cr = this.getContentResolver();
Bitmap bitmap;
try
{
BitmapFactory.Options ops = new BitmapFactory.Options();
ops.inSampleSize = 4;
bitmap = BitmapFactory.decodeFile(uri.getPath().toString(), ops);
}
catch (Exception e)
{
Toast.makeText(this, "Failed to load", Toast.LENGTH_SHORT).show();
Log.d(TAG, "Failed to load", e);
}
}
}
The create temp file mentioned above:
private File createTemporaryFile(String part, String ext) throws Exception
{
File tempDir= Environment.getExternalStorageDirectory();
tempDir=new File(tempDir.getAbsolutePath()+"/.temp/");
Log.i(TAG, tempDir.toString());
if(!tempDir.exists())
{
Log.i(TAG, "Dir doesnt exist");
tempDir.mkdirs();
}
return File.createTempFile(part, ext, tempDir);
}
I realize this isn't probably as simple as you were hoping for, but this approach seemed to be as flexible and compatible as possible. Let me know if I left anything else out

How to use android Device native camera..?

I am developing an app where i want to use device native camera.i.e. i want to use the exact camera which the device will show when we click on camera option from device including widgets like front camera option etc. i saw one app in android market which exactly doing this. Can any one help me??
Thanks,
Ram.

If u want to save the image in a folder, then this is the easiest way:
try {
//where to save the image
File root = new File(Environment.getExternalStorageDirectory()
+ File.separator + "foldername" + File.separator);
root.mkdirs();
sdImageMainDirectory = new File(root, "myPicName.jpg");
outputFileUri = Uri.fromFile(sdImageMainDirectory);
startCameraActivity();
} catch (Exception e) {
Toast.makeText(this, "Error occured. Please try again later.",
Toast.LENGTH_SHORT).show();
finish();
}
protected void startCameraActivity() {
Intent cameraIntent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
cameraIntent.putExtra(MediaStore.EXTRA_OUTPUT, outputFileUri);
startActivityForResult(cameraIntent, 101);
}
#Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if(requestCode==101 && resultCode==-1)
{
try
{
//use that file here
}
catch(Exception ex)
{
Log.v("OnCameraCallBack",ex.getMessage());
}
}
If u want to save it in default location:
Intent cameraIntent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
startActivityForResult(cameraIntent, 101);
#Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if(requestCode==101 && resultCode==-1)
{
try
{
//use that file here
}
catch(Exception ex)
{
Log.v("OnCameraCallBack",ex.getMessage());
}
}