Android updated Api features for Camera to Text detection Example

Here sharing Android  updated Api Features for Optical character recognition(OCR).  with using Camera pictures able to read character for it and can share that read Character to other apps.
To create Application in Android studio follow below steps

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>

<manifest xmlns:android="http://schemas.android.com/apk/res/android"

package="yourpackageName">

    <uses-permission android:name="android.permission.CAMERA"/>

    <application

        android:allowBackup="true"

        android:icon="@mipmap/ic_launcher"

        android:label="@string/app_name"

        android:roundIcon="@mipmap/ic_launcher_round"

        android:supportsRtl="true"

        android:theme="@style/AppTheme">

        <activity android:name=".MainActivity">

            <intent-filter>

                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <meta-data android:name="com.google.android.gms.vision.DEPENDENCIES" 

        android:value="ocr"/>        
    </application>
</manifest>

build.gradle

dependencies {
    compile 'com.google.android.gms:play-services-vision:11.0.4'}

activity_main.xml

Here we also use Button to share character to other apps.

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    xmlns:tools="http://schemas.android.com/tools"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:orientation="vertical"

    android:weightSum="5"

    tools:context="Yourpackage.MainActivity">

    <SurfaceView

        android:id="@+id/surfaceView"

        android:layout_width="match_parent"

        android:layout_height="0dp"

        android:layout_weight="4" />

    <TextView

        android:id="@+id/text_view"

        android:layout_width="match_parent"

        android:layout_height="0dp"

        android:layout_margin="8dp"

        android:layout_weight="1"

        android:gravity="center"

        android:textStyle="bold"

        android:background="@drawable/mboarder"

        android:text="@string/txt_message"

        android:textColor="@android:color/black"

        android:textSize="20sp" />

    <Button

        android:id="@+id/btnShare"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:text="Share"

        android:textAllCaps="false"

        android:background="@color/colorAccent"

        android:layout_marginBottom="5dp"

        android:textColor="@android:color/white"

        android:layout_gravity="center_horizontal"/>

</LinearLayout>

MainActivity.java

package your.packageNamehere;

import android.Manifest;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.support.annotation.NonNull;
import android.support.v4.app.ActivityCompat;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.util.SparseArray;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
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 MainActivity extends AppCompatActivity {

    SurfaceView mCameraView;
    TextView mTextView;
    CameraSource mCameraSource;

    private static final String TAG = "MainActivity";
    private static final int requestPermissionID = 101;
    Button btnShare;
    String ReadString;

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

        mCameraView = findViewById(R.id.surfaceView);
        mTextView = findViewById(R.id.text_view);
        btnShare = findViewById(R.id.btnShare);

        btnShare.setOnClickListener(new View.OnClickListener() {
            @Override            public void onClick(View v) {

                Intent sendIntent = new Intent();
                sendIntent.setAction(Intent.ACTION_SEND);
                sendIntent.putExtra(Intent.EXTRA_TEXT,ReadString);
                sendIntent.setType("text/plain");
                startActivity(sendIntent);

            }
        });

        startCameraRead();
    }

    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        if (requestCode != requestPermissionID) {
            Log.d(TAG, "Got permission result" + requestCode);
            super.onRequestPermissionsResult(requestCode, permissions, grantResults);
            return;
        }

        if (grantResults[0] == PackageManager.PERMISSION_GRANTED) {
            try {
                if (ActivityCompat.checkSelfPermission(this, Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED) {
                    return;
                }
                mCameraSource.start(mCameraView.getHolder());
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

    private void startCameraRead() {
        final TextRecognizer ReadText = new TextRecognizer.Builder(getApplicationContext()).build();
        if (!ReadText.isOperational()) {
            Log.w(TAG, "Detector yet not allow ");
        } else {

            mCameraSource = new CameraSource.Builder(getApplicationContext(), ReadText)
                    .setFacing(CameraSource.CAMERA_FACING_BACK)
                    .setRequestedPreviewSize(1280, 1024)
                    .setAutoFocusEnabled(true)
                    .setRequestedFps(2.0f)
                    .build();

            mCameraView.getHolder().addCallback(new SurfaceHolder.Callback() {
                @Override                public void surfaceCreated(SurfaceHolder holder) {
                    try {

                        if (ActivityCompat.checkSelfPermission(getApplicationContext(),
                                Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED) {

                            ActivityCompat.requestPermissions(MainActivity.this,
                                    new String[]{Manifest.permission.CAMERA},
                                    requestPermissionID);
                            return;
                        }
                        mCameraSource.start(mCameraView.getHolder());
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                }

                @Override
                public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
                }

                @Override
                public void surfaceDestroyed(SurfaceHolder holder) {
                    mCameraSource.stop();
                }
            });

            ReadText.setProcessor(new Detector.Processor<TextBlock>() {
                @Override                
                public void release() {
                }
               @Override
                public void receiveDetections(Detector.Detections<TextBlock> detections) {
                    final SparseArray<TextBlock> items = detections.getDetectedItems();
                    if (items.size() != 0 ){

                        mTextView.post(new Runnable() {
                            @Override                            public void run() {
                                StringBuilder stringBuilder = new StringBuilder();
                                for(int i=0;i<items.size();i++){
                                    TextBlock item = items.valueAt(i);
                                    stringBuilder.append(item.getValue());
                                    stringBuilder.append("\n");
                                }
                                mTextView.setText(stringBuilder.toString());
                                ReadString  =  stringBuilder.toString();
                            }
                        });
                    }
                }
            });
        }
    }
}