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  mTextRecognizer.setProcessor(new Detector.Processor() {
                @Override
                public void release() {

                }

                @Override
                public void receiveDetections(Detector.Detections detections) {
                    SparseArray items = detections.getDetectedItems();
                    StringBuilder stringBuilder = new StringBuilder();

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mCameraSource = new CameraSource.Builder(getApplicationContext(), mTextRecognizer)
                    .setFacing(CameraSource.CAMERA_FACING_BACK)
                    .setRequestedPreviewSize(1280, 1024)
                    .setRequestedFps(15.0f)
                    .setAutoFocusEnabled(true)
                    .build();

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

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if (ActivityCompat.checkSelfPermission(this, Manifest.permission.CAMERA) == PackageManager.PERMISSION_GRANTED) {
    startTextRecognizer();
} else {
    askCameraPermission();
}

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<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/activity_main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.example.textdetectionsample.MainActivity">

    <SurfaceView
        android:id="@+id/surfaceView"

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compile 'com.google.android.gms:play-services-vision:11.8.0'

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

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apply plugin: 'com.android.library'
apply plugin: 'com.jfrog.bintray'
apply plugin: 'com.github.dcendents.android-maven'
version = "2.0.6"
group = "com.example.mylibrary"

android {
    compileSdkVersion 25
    buildToolsVersion "25.0.2"

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#
# Build configuration for Circle CI
#
# See this thread for speeding up and caching directories: https://discuss.circleci.com/t/installing-android-build-tools-23-0-2/924
#

general:
    artifacts:
        - /home/ubuntu/AndroidCI/app/build/outputs/apk/