/
Scanner.java
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/
Scanner.java
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package com.lucem.anb.characterscanner;
import android.Manifest;
import android.app.Activity;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.IntentFilter;
import android.content.pm.PackageManager;
import android.net.Uri;
import android.support.v4.app.ActivityCompat;
import android.support.v7.app.AlertDialog;
import android.util.Log;
import android.util.SparseArray;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.widget.Toast;
import com.google.android.gms.vision.CameraSource;
import com.google.android.gms.vision.Detector;
import com.google.android.gms.vision.text.TextBlock;
import com.google.android.gms.vision.text.TextRecognizer;
import java.io.IOException;
public class Scanner {
private Activity activity;
private static int REQUEST_CAMERA = 12;
private static String LOG_TEXT = "SCANNER", state = "loading";
private SurfaceView camera;
private boolean showToasts = true, scanning = false;
private ScannerListener listener;
public Scanner(Activity activity){
this.activity = activity;
}
public Scanner(Activity activity, SurfaceView surfaceView){
this.activity = activity;
setSurfaceView(surfaceView);
}
public Scanner(Activity activity, SurfaceView surfaceView, ScannerListener listener){
this.activity = activity;
setSurfaceView(surfaceView);
setListener(listener);
scan();
}
public void setSurfaceView(SurfaceView surfaceView){
this.camera = surfaceView;
}
public void setListener(ScannerListener listener){
this.listener = listener;
}
public void scan(){
prepareScanning();
}
private void prepareScanning(){
if (ActivityCompat.checkSelfPermission(activity, Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions(activity, new String[]{Manifest.permission.CAMERA}, REQUEST_CAMERA);
return;
}
TextRecognizer textRecognizer = new TextRecognizer.Builder(activity).build();
if (!textRecognizer.isOperational()) {
IntentFilter lowStorageFilter = new IntentFilter(Intent.ACTION_DEVICE_STORAGE_LOW);
boolean lowStorage = activity.registerReceiver(null, lowStorageFilter) != null;
if (lowStorage){
state = "You have low storage";
if (showToasts)Toast.makeText(activity, state, Toast.LENGTH_LONG).show();
Log.e(LOG_TEXT,state);
listener.onStateChanged(state, 2);
return;
}else{
state = "OCR not ready";
if (showToasts)Toast.makeText(activity, state, Toast.LENGTH_LONG).show();
Log.e(LOG_TEXT,state);
listener.onStateChanged(state, 3);
return;
}
}
final CameraSource cameraSource = new CameraSource.Builder(activity, textRecognizer)
.setFacing(CameraSource.CAMERA_FACING_BACK)
.setRequestedPreviewSize(1280, 1024)
.setRequestedFps(2.0f)
.setAutoFocusEnabled(true)
.build();
camera.getHolder().addCallback(new SurfaceHolder.Callback() {
@Override
public void surfaceCreated(SurfaceHolder surfaceHolder) {
try {
if (ActivityCompat.checkSelfPermission(activity, Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions(activity, new String[]{Manifest.permission.CAMERA}, REQUEST_CAMERA);
return;
}
cameraSource.start(camera.getHolder());
} catch (IOException e) {
e.printStackTrace();
}
}
@Override
public void surfaceChanged(SurfaceHolder surfaceHolder, int i, int i1, int i2) {
}
@Override
public void surfaceDestroyed(SurfaceHolder surfaceHolder) {
cameraSource.stop();
}
});
textRecognizer.setProcessor(new Detector.Processor<TextBlock>() {
@Override
public void release(){}
@Override
public void receiveDetections(Detector.Detections<TextBlock> detections) {
state = "running";
listener.onStateChanged(state, 1);
final SparseArray<TextBlock> items = detections.getDetectedItems();
if (items.size() != 0) {
final StringBuilder stringBuilder = new StringBuilder();
for (int i = 0; i < items.size(); ++i) {
TextBlock item = items.valueAt(i);
stringBuilder.append(item.getValue());
stringBuilder.append("\n");
}
activity.runOnUiThread(new Runnable() {
public void run() {
listener.onDetected(stringBuilder.toString());
}
});
Log.d(LOG_TEXT, stringBuilder.toString());
}
}
});
}
public void showToasts(boolean show){
showToasts = show;
}
public String getState(){
return state;
}
public void setScanning(boolean scanning){
if (scanning){
prepareScanning();
scanning = true;
}else{
camera.destroyDrawingCache();
scanning = false;
}
}
public boolean isScanning(){return scanning;}
}