From e53ceb9ef079de6b27a73f749cdba8664a071a9e Mon Sep 17 00:00:00 2001
From: Ivan Murashov <ivan.murashov@u-s.su>
Date: Fri, 28 Jul 2017 16:39:37 +0300
Subject: [PATCH] =?UTF-8?q?=D0=9A=D0=B0=D0=BC=D0=B5=D1=80=D0=B0=20=D0=BD?=
 =?UTF-8?q?=D0=B5=20=D0=BF=D0=B0=D0=B4=D0=B0=D0=B5=D1=82,=20=D0=BF=D1=80?=
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 =?UTF-8?q?=D1=80=D0=BD=D0=B5=D1=82=20=D1=81=D0=BE=D0=B5=D0=B4=D0=B8=D0=BD?=
 =?UTF-8?q?=D0=B5=D0=BD=D0=B8=D1=8F=20=D0=B2=20=D1=83=D1=81=D0=BB=D0=BE?=
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 =?UTF-8?q?=D1=83=D1=80=D0=B0=20=D0=BD=D0=B0=20=D0=B2=D0=B2=D0=BE=D0=B4?=
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MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 android/app/build.gradle                      |   1 -
 android/app/src/main/AndroidManifest.xml      |   5 +-
 .../checker/activity/CameraActivity.java      | 339 +++++++++---------
 .../checker/activity/CameraPreview.java       | 207 +++++++++++
 .../dinect/checker/activity/MainActivity.java |  13 +-
 .../com/dinect/checker/activity/Utils.java    |  16 +
 .../service/RegistrationIntentService.java    |  24 --
 android/app/src/main/res/layout/a_scanner.xml |   4 -
 lib/base_state.dart                           |   2 +
 lib/faq.dart                                  |  12 +-
 lib/purchase.dart                             |  44 ++-
 11 files changed, 425 insertions(+), 242 deletions(-)
 create mode 100644 android/app/src/main/java/com/dinect/checker/activity/CameraPreview.java
 create mode 100644 android/app/src/main/java/com/dinect/checker/activity/Utils.java
 delete mode 100644 android/app/src/main/java/com/dinect/checker/service/RegistrationIntentService.java

diff --git a/android/app/build.gradle b/android/app/build.gradle
index 30d806e..e237588 100644
--- a/android/app/build.gradle
+++ b/android/app/build.gradle
@@ -47,7 +47,6 @@ flutter {
 
 dependencies {
     compile fileTree(dir: 'libs', include: ['*.jar'])
-    compile "com.google.android.gms:play-services-gcm:11.0.1"
     compile 'com.android.support:appcompat-v7:25.0.0'
     compile 'com.squareup.okhttp3:okhttp:3.8.1'
     compile 'com.squareup.okio:okio:1.13.0'
diff --git a/android/app/src/main/AndroidManifest.xml b/android/app/src/main/AndroidManifest.xml
index 63ea64f..987c67a 100644
--- a/android/app/src/main/AndroidManifest.xml
+++ b/android/app/src/main/AndroidManifest.xml
@@ -11,6 +11,7 @@
     -->
     <uses-permission android:name="android.permission.INTERNET"/>
     <uses-permission android:name="android.permission.CAMERA"/>
+    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
 
     <!-- io.flutter.app.FlutterApplication is an android.app.Application that
          calls FlutterMain.startInitialization(this); in its onCreate method.
@@ -35,9 +36,5 @@
                   android:screenOrientation="portrait"
                   android:theme="@style/AppTheme"/>
 
-        <service
-                android:name="com.dinect.checker.service.RegistrationIntentService"
-                android:exported="false"/>
-
     </application>
 </manifest>
diff --git a/android/app/src/main/java/com/dinect/checker/activity/CameraActivity.java b/android/app/src/main/java/com/dinect/checker/activity/CameraActivity.java
index a09ff55..d8ce8f9 100644
--- a/android/app/src/main/java/com/dinect/checker/activity/CameraActivity.java
+++ b/android/app/src/main/java/com/dinect/checker/activity/CameraActivity.java
@@ -6,11 +6,13 @@ import android.content.Intent;
 import android.os.Bundle;
 import android.os.Handler;
 import android.util.Log;
-import android.graphics.Bitmap;
-import android.graphics.BitmapFactory;
-import android.graphics.ImageFormat;
+import android.graphics.*;
 import android.util.DisplayMetrics;
-import android.content.res.Resources ;
+import android.content.res.Resources;
+import android.content.pm.PackageManager;
+import android.text.TextUtils;
+import android.view.Window;
+import android.view.WindowManager;
 import android.view.View;
 import android.view.Menu;
 import android.view.View.OnClickListener;
@@ -62,50 +64,60 @@ import android.app.AlertDialog;
 import android.app.AlertDialog.Builder; 
 import android.content.DialogInterface;
 import android.view.LayoutInflater;
+import com.dinect.checker.activity.Utils;
 import com.dinect.checker.R;
 
-public class CameraActivity extends AppCompatActivity implements SurfaceHolder.Callback {
+public class CameraActivity extends AppCompatActivity implements Camera.PreviewCallback {
 
-    private Camera mCamera;
-    private Handler mAutoFocusHandler = new Handler();
-    private ImageScanner mScanner = new ImageScanner();
-    private HashMap<String, Integer> mContours = new HashMap<>();
+    public static final String SCAN_MODES = "SCAN_MODES";
+    public static final String SCAN_RESULT = "SCAN_RESULT";
+    public static final String SCAN_RESULT_TYPE = "SCAN_RESULT_TYPE";
+    public static final String ERROR_INFO = "ERROR_INFO";
 
-    private boolean mBarcodeScanned = false;
-    private boolean previewing = true;
-    private Handler autoFocusHandler;
     private int mOffset;
     private String mToken;
     private LogoutDialogFragment mDialog;
+    private NetworkThread mNetworkThread;
+
+    private CameraPreview mPreview;
+    private Camera mCamera;
+    private ImageScanner mScanner;
+    private Handler mAutoFocusHandler;
+    private boolean mPreviewing = true;
 
     static {
         System.loadLibrary("iconv");
     }
 
-        /** A safe way to get an instance of the Camera object. */
-    private static Camera getCameraInstance(){
-        Camera c = null;
-        try {
-            c = Camera.open();
-        } catch (Exception e){
-            e.printStackTrace();
-        }
-        return c;
-    }
-
-    public void onCreate(Bundle savedInstanceState) {
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
-        setContentView(R.layout.a_scanner);
 
-        SurfaceView preview = (SurfaceView) findViewById(R.id.cameraPreview);
-        SurfaceHolder holder = preview.getHolder();
+        if(!isCameraAvailable()) {
+            // Cancel request if there is no rear-facing camera.
+            cancelRequest();
+            return;
+        }
+
+        mOffset = (int) (56 * getResources().getDisplayMetrics().density);
+        mToken = getIntent().getStringExtra(MainActivity.PREF_POS_TOKEN);
+
+        // Hide the window title.
+        requestWindowFeature(Window.FEATURE_NO_TITLE);
+
+        mAutoFocusHandler = new Handler();
+
+        // Create and configure the ImageScanner;
+        setupScanner();
+
+        // Create a RelativeLayout container that will hold a SurfaceView,
+        // and set it as the content of our activity.
+        mPreview = new CameraPreview(this, this, autoFocusCB);
+        // setContentView(mPreview);
+        setContentView(R.layout.a_scanner);
 
         Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
         setSupportActionBar(toolbar);
-        
-        mOffset = (int) (56 * getResources().getDisplayMetrics().density);
-
-        autoFocusHandler = new Handler();
 
         ActionBar actionBar = getSupportActionBar();
 
@@ -114,108 +126,123 @@ public class CameraActivity extends AppCompatActivity implements SurfaceHolder.C
             actionBar.setDisplayHomeAsUpEnabled(false);
         }
 
-        mToken = getIntent().getStringExtra(MainActivity.PREF_POS_TOKEN);
-        
-        if (mToken == null) {
-            Intent intent = new Intent();
-            intent.putExtra("item", "logout");
-            setResult(RESULT_OK, intent);
-            finish();
-        }
+        FrameLayout root = (FrameLayout) findViewById(R.id.rootLayout);
+        root.addView(mPreview, 0);
+    }
 
-        mCamera = getCameraInstance();
-        mCamera.setPreviewCallback(previewCallback);
-        holder.addCallback(this);
+    public void setupScanner() {
+        mScanner = new ImageScanner();
+        mScanner.setConfig(0, Config.X_DENSITY, 3);
+        mScanner.setConfig(0, Config.Y_DENSITY, 3);
+
+        int[] symbols = getIntent().getIntArrayExtra(SCAN_MODES);
+        if (symbols != null) {
+            mScanner.setConfig(Symbol.NONE, Config.ENABLE, 0);
+            for (int symbol : symbols) {
+                mScanner.setConfig(symbol, Config.ENABLE, 1);
+            }
+        }
     }
 
     @Override
     protected void onResume() {
         super.onResume();
-        mCamera.startPreview();
-        previewing = true;
+
+        // Open the default i.e. the first rear facing camera.
+        mCamera = Camera.open();
+        if(mCamera == null) {
+            // Cancel request if mCamera is null.
+            cancelRequest();
+            return;
+        }
+
+        mPreview.setCamera(mCamera);
+        mPreview.showSurfaceView();
+
+        mPreviewing = true;
     }
-     
+
     @Override
     protected void onPause() {
         super.onPause();
-        mCamera.stopPreview();
-        previewing = false;
-    }
 
-    @Override
-    public void onDestroy() {
-        super.onDestroy();
-        if (mCamera != null)
-            mCamera.release();
-        mCamera = null;
-    }
-
-    @Override
-    public void surfaceCreated(SurfaceHolder holder) {
-        try {
-            mCamera.setPreviewDisplay(holder);
-            mCamera.startPreview();
-            previewing = true;
-            try {
-                mCamera.autoFocus(autoFocusCallback);
-            } catch(Exception e) {
-                e.printStackTrace();
-            }
-            Log.d("kifio", "surfaceCreated");
-        } catch (IOException e) {
-            e.printStackTrace();
-            }
-        }
-
-        @Override
-        public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
-            setCameraDisplayOrientation(0);
-            Log.d("kifio", "surfaceChanged");
-        }
-
-        @Override
-        public void surfaceDestroyed(SurfaceHolder holder) {
-            Log.d("kifio", "surfaceDestroyed");
+        // Because the Camera object is a shared resource, it's very
+        // important to release it when the activity is paused.
+        if (mCamera != null) {
+            mPreview.setCamera(null);
             mCamera.cancelAutoFocus();
-        }
+            mCamera.setPreviewCallback(null);
+            mCamera.stopPreview();
+            mCamera.release();
 
-    void setCameraDisplayOrientation(int cameraId) {
+            // According to Jason Kuang on http://stackoverflow.com/questions/6519120/how-to-recover-camera-preview-from-sleep,
+            // there might be surface recreation problems when the device goes to sleep. So lets just hide it and
+            // recreate on resume
+            mPreview.hideSurfaceView();
 
-        int rotation = getWindowManager().getDefaultDisplay().getRotation();
-        int degrees = 0;
-        switch (rotation) {
-        case Surface.ROTATION_0:
-          degrees = 0;
-          break;
-        case Surface.ROTATION_90:
-          degrees = 90;
-          break;
-        case Surface.ROTATION_180:
-          degrees = 180;
-          break;
-        case Surface.ROTATION_270:
-          degrees = 270;
-          break;
+            mPreviewing = false;
+            mCamera = null;
         }
-         
-        int result = 0;
-         
-        // получаем инфо по камере cameraId
-        CameraInfo info = new CameraInfo();
-        Camera.getCameraInfo(cameraId, info);
-     
-        // задняя камера
-        if (info.facing == CameraInfo.CAMERA_FACING_BACK) {
-          result = ((360 - degrees) + info.orientation);
-        } else
-        // передняя камера
-        if (info.facing == CameraInfo.CAMERA_FACING_FRONT) {
-          result = ((360 - degrees) - info.orientation);
-          result += 360;
+    }
+
+    public boolean isCameraAvailable() {
+        PackageManager pm = getPackageManager();
+        return pm.hasSystemFeature(PackageManager.FEATURE_CAMERA);
+    }
+
+    public void cancelRequest() {
+        Intent dataIntent = new Intent();
+        dataIntent.putExtra(ERROR_INFO, "Camera unavailable");
+        setResult(RESULT_CANCELED, dataIntent);
+        finish();
+    }
+
+    public void onPreviewFrame(byte[] data, Camera camera) {
+        if (mPreviewing) {
+            Camera.Parameters parameters = camera.getParameters();
+            Camera.Size size = parameters.getPreviewSize();
+
+            Image barcode = new Image(size.width, size.height, "Y800");
+            barcode.setData(data);
+            barcode.setCrop((size.width / 2) - mOffset, 0, (size.width / 2) + mOffset, size.height);
+
+            int result = mScanner.scanImage(barcode);
+
+            if (result != 0) {
+                mCamera.cancelAutoFocus();
+                mCamera.setPreviewCallback(null);
+                mCamera.stopPreview();
+                mPreviewing = false;
+                SymbolSet syms = mScanner.getResults();
+                for (Symbol sym : syms) {
+                    String symData = sym.getData();
+                    if (!TextUtils.isEmpty(symData) && Utils.isOnline(this)) {
+                        mPreviewing = false;
+                        requestUser(sym.getData());
+                        break;
+                    } else {
+                        mPreviewing = true;
+                        Toast.makeText(this, "Проверьте интернет соединение", Toast.LENGTH_SHORT).show();
+                    }
+                }
+            }
         }
-        result = result % 360;
-        mCamera.setDisplayOrientation(result);
-      }
+    }
+
+    private Runnable doAutoFocus = new Runnable() {
+        public void run() {
+            if(mCamera != null && mPreviewing) {
+                mCamera.autoFocus(autoFocusCB);
+            }
+        }
+    };
+
+    // Mimic continuous auto-focusing
+    Camera.AutoFocusCallback autoFocusCB = new Camera.AutoFocusCallback() {
+        public void onAutoFocus(boolean success, Camera camera) {
+            mAutoFocusHandler.postDelayed(doAutoFocus, 1000);
+        }
+    };
 
     @Override
     public boolean onCreateOptionsMenu(Menu menu) {
@@ -223,11 +250,8 @@ public class CameraActivity extends AppCompatActivity implements SurfaceHolder.C
         return true;
     }
 
-
-
     @Override
     public boolean onOptionsItemSelected(MenuItem item) {
-       
         if (item.getItemId() == R.id.logout) {
             mDialog = new LogoutDialogFragment();
             mDialog.show(getFragmentManager(), "logout");
@@ -248,54 +272,24 @@ public class CameraActivity extends AppCompatActivity implements SurfaceHolder.C
         finish();
     } 
 
-    PreviewCallback previewCallback = new PreviewCallback() {
-        public void onPreviewFrame(byte[] data, Camera camera) {
-
-            Parameters parameters = camera.getParameters();
-            Size size = parameters.getPreviewSize();
-
-            Image barcode = new Image(size.width, size.height, "Y800");
-            barcode.setData(data);
-
-            barcode.setCrop((size.width / 2) - mOffset, 0, (size.width / 2) + mOffset, size.height);
-
-            int result = mScanner.scanImage(barcode);
-
-            if (result != 0) {
-                previewing = false;
-                mCamera.setPreviewCallback(null);
-                mCamera.stopPreview();
-
-                SymbolSet syms = mScanner.getResults();
-
-                for (Symbol sym : syms) {
-                    mBarcodeScanned = true;
-                    requestUser(sym.getData());
-                    break;    
-                }
-            }
-        }
-    };
-
-    private NetworkThread t;
-
     private void requestUser(String code) {
-        t = new NetworkThread(this, code, mToken);
-        t.start();
+        mNetworkThread = new NetworkThread(this, code, mToken);
+        mNetworkThread.start();
     }
 
     void handleResult(Response response, String card) {
         if (response == null) {
-            previewing = true;
-            mCamera.setPreviewCallback(previewCallback);
+            mPreviewing = true;
             mCamera.startPreview();
             return;
         }
-        if (response.code() == 200) {
+        Log.d("kifio", "status: " + response.code());
+        int code = response.code(); 
+        if (code == 200) {
             try {
                 String s = response.body().string();
-                JSONArray users = new JSONArray(s);
                 Log.d("kifio", s);
+                JSONArray users = new JSONArray(s);
                 if (users.length() > 0) {
                     Intent intent = new Intent();
                     intent.putExtra("user", users.get(0).toString());
@@ -304,14 +298,17 @@ public class CameraActivity extends AppCompatActivity implements SurfaceHolder.C
                     finish();
                 } else {
                     Toast.makeText(this, "Пользователь с таким id не найден", Toast.LENGTH_SHORT).show();
-                    previewing = true;
-                    mCamera.setPreviewCallback(previewCallback);
+                    mPreviewing = true;
                     mCamera.startPreview();
                 }
             } catch (IOException | JSONException e) {
                 e.printStackTrace();
             }
+        } else if(code == 204) {
+            mPreviewing = true;
+            Toast.makeText(this, "Пользователь с таким id не найден", Toast.LENGTH_SHORT).show();
         } else {
+            mPreviewing = true;
             try {
                 Log.d("kifio", response.body().string());
                 Toast.makeText(this, "Произошла ошибка", Toast.LENGTH_SHORT).show();
@@ -320,28 +317,15 @@ public class CameraActivity extends AppCompatActivity implements SurfaceHolder.C
             }
         }
 
-        t.close();
+        mNetworkThread.close();
+        mNetworkThread = null;
     }
 
-    private Runnable doAutoFocus = new Runnable() {
-        public void run() {
-            if (previewing) {
-                mCamera.autoFocus(autoFocusCallback);
-            }
-        }
-    };
-
-    AutoFocusCallback autoFocusCallback = new AutoFocusCallback() {
-        public void onAutoFocus(boolean success, Camera camera) {
-            autoFocusHandler.postDelayed(doAutoFocus, 1000);
-        }
-    };
-
     private static class NetworkThread extends Thread {
 
         private CameraActivity mActivity;
         private String mCode = "";
-        private String mUrl = "https://pos-api-int.dinect.com/20130701/?auto=";
+        private String mUrl = "https://pos-api-int.dinect.com/20130701/users?auto=";
         private String mCard = "";
         private String mToken = "";
         
@@ -363,6 +347,9 @@ public class CameraActivity extends AppCompatActivity implements SurfaceHolder.C
         @Override
         public void run() {
 
+            Log.d("kifio", mUrl);
+            Log.d("kifio", mToken);
+
             Request request = new Request.Builder()
                 .addHeader("DM-Authorization", "dmapptoken 9fec83cdca38c357e6b65dbb17514cdd36bf2a08")
                 .addHeader("Authorization", "dmtoken " + mToken)
@@ -416,7 +403,6 @@ public class CameraActivity extends AppCompatActivity implements SurfaceHolder.C
             negativeButton.setOnClickListener(new OnClickListener() {
                 @Override
                 public void onClick(View view) {
-                    Log.d("kifio", "Negative click!");
                     ((CameraActivity) getActivity()).dismissDialog();
                 }
             });
@@ -424,7 +410,6 @@ public class CameraActivity extends AppCompatActivity implements SurfaceHolder.C
             positiveButton.setOnClickListener(new OnClickListener() {
                 @Override
                 public void onClick(View view) {
-                    Log.d("kifio", "Positive click!");
                     ((CameraActivity) getActivity()).logout();
                 }
             });
diff --git a/android/app/src/main/java/com/dinect/checker/activity/CameraPreview.java b/android/app/src/main/java/com/dinect/checker/activity/CameraPreview.java
new file mode 100644
index 0000000..d8bd559
--- /dev/null
+++ b/android/app/src/main/java/com/dinect/checker/activity/CameraPreview.java
@@ -0,0 +1,207 @@
+package com.dinect.checker.activity;
+
+import android.content.Context;
+import android.app.Activity;
+import android.hardware.Camera;
+import android.hardware.Camera.CameraInfo;
+import android.hardware.Camera.AutoFocusCallback;
+import android.hardware.Camera.PreviewCallback;
+import android.hardware.Camera.Size;
+import android.util.Log;
+import android.view.Surface;
+import android.view.SurfaceHolder;
+import android.view.SurfaceView;
+import android.view.View;
+import android.view.ViewGroup;
+import java.io.IOException;
+import java.util.List;
+
+class CameraPreview extends ViewGroup implements SurfaceHolder.Callback {
+    private final String TAG = "CameraPreview";
+
+    SurfaceView mSurfaceView;
+    SurfaceHolder mHolder;
+    Size mPreviewSize;
+    List<Size> mSupportedPreviewSizes;
+    Camera mCamera;
+    PreviewCallback mPreviewCallback;
+    AutoFocusCallback mAutoFocusCallback;
+
+    CameraPreview(Context context, PreviewCallback previewCallback, AutoFocusCallback autoFocusCb) {
+        super(context);
+
+        mPreviewCallback = previewCallback;
+        mAutoFocusCallback = autoFocusCb;
+        mSurfaceView = new SurfaceView(context);
+        addView(mSurfaceView);
+
+        // Install a SurfaceHolder.Callback so we get notified when the
+        // underlying surface is created and destroyed.
+        mHolder = mSurfaceView.getHolder();
+        mHolder.addCallback(this);
+        mHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
+    }
+
+    public void setCamera(Camera camera) {
+        mCamera = camera;
+        if (mCamera != null) {
+            mSupportedPreviewSizes = mCamera.getParameters().getSupportedPreviewSizes();
+            requestLayout();
+        }
+    }
+
+    @Override
+    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
+        // We purposely disregard child measurements because act as a
+        // wrapper to a SurfaceView that centers the camera preview instead
+        // of stretching it.
+        final int width = resolveSize(getSuggestedMinimumWidth(), widthMeasureSpec);
+        final int height = resolveSize(getSuggestedMinimumHeight(), heightMeasureSpec);
+        setMeasuredDimension(width, height);
+
+        if (mSupportedPreviewSizes != null) {
+            mPreviewSize = getOptimalPreviewSize(mSupportedPreviewSizes, width, height);
+        }
+    }
+
+    @Override
+    protected void onLayout(boolean changed, int l, int t, int r, int b) {
+        if (changed && getChildCount() > 0) {
+            final View child = getChildAt(0);
+
+            final int width = r - l;
+            final int height = b - t;
+
+            int previewWidth = width;
+            int previewHeight = height;
+            if (mPreviewSize != null) {
+                previewWidth = mPreviewSize.width;
+                previewHeight = mPreviewSize.height;
+            }
+            
+            child.layout(0, 0,width, height);
+        }
+    }
+
+    public void hideSurfaceView() {
+        mSurfaceView.setVisibility(View.INVISIBLE);
+    }
+
+    public void showSurfaceView() {
+        mSurfaceView.setVisibility(View.VISIBLE);
+    }
+
+    public void surfaceCreated(SurfaceHolder holder) {
+        // The Surface has been created, acquire the camera and tell it where
+        // to draw.
+        try {
+            if (mCamera != null) {
+                mCamera.setPreviewDisplay(holder);
+            }
+        } catch (IOException exception) {
+            Log.e(TAG, "IOException caused by setPreviewDisplay()", exception);
+        }
+    }
+
+    public void surfaceDestroyed(SurfaceHolder holder) {
+        // Surface will be destroyed when we return, so stop the preview.
+        if (mCamera != null) {
+            mCamera.cancelAutoFocus();
+            mCamera.stopPreview();
+        }
+    }
+
+
+    private Size getOptimalPreviewSize(List<Size> sizes, int w, int h) {
+        final double ASPECT_TOLERANCE = 0.1;
+        double targetRatio = (double) w / h;
+        if (sizes == null) return null;
+
+        Size optimalSize = null;
+        double minDiff = Double.MAX_VALUE;
+
+        int targetHeight = h;
+
+        // Try to find an size match aspect ratio and size
+        for (Size size : sizes) {
+            double ratio = (double) size.width / size.height;
+            if (Math.abs(ratio - targetRatio) > ASPECT_TOLERANCE) continue;
+            if (Math.abs(size.height - targetHeight) < minDiff) {
+                optimalSize = size;
+                minDiff = Math.abs(size.height - targetHeight);
+            }
+        }
+
+        // Cannot find the one match the aspect ratio, ignore the requirement
+        if (optimalSize == null) {
+            minDiff = Double.MAX_VALUE;
+            for (Size size : sizes) {
+                if (Math.abs(size.height - targetHeight) < minDiff) {
+                    optimalSize = size;
+                    minDiff = Math.abs(size.height - targetHeight);
+                }
+            }
+        }
+        return optimalSize;
+    }
+
+    public void surfaceChanged(SurfaceHolder holder, int format, int w, int h) {
+        if (holder.getSurface() == null){
+          // preview surface does not exist
+          return;
+        }
+
+        if (mCamera != null) {
+            // Now that the size is known, set up the camera parameters and begin
+            // the preview.
+            setCameraDisplayOrientation(0);
+            Camera.Parameters parameters = mCamera.getParameters();
+            parameters.setPreviewSize(mPreviewSize.width, mPreviewSize.height);
+            requestLayout();
+
+            mCamera.setParameters(parameters);
+            mCamera.setPreviewCallback(mPreviewCallback);
+            mCamera.startPreview();
+            mCamera.autoFocus(mAutoFocusCallback);
+        }
+    }
+
+    void setCameraDisplayOrientation(int cameraId) {
+
+        int rotation = ((Activity) getContext()).getWindowManager().getDefaultDisplay().getRotation();
+        int degrees = 0;
+        switch (rotation) {
+        case Surface.ROTATION_0:
+          degrees = 0;
+          break;
+        case Surface.ROTATION_90:
+          degrees = 90;
+          break;
+        case Surface.ROTATION_180:
+          degrees = 180;
+          break;
+        case Surface.ROTATION_270:
+          degrees = 270;
+          break;
+        }
+         
+        int result = 0;
+         
+        // получаем инфо по камере cameraId
+        CameraInfo info = new CameraInfo();
+        Camera.getCameraInfo(cameraId, info);
+     
+        // задняя камера
+        if (info.facing == CameraInfo.CAMERA_FACING_BACK) {
+          result = ((360 - degrees) + info.orientation);
+        } else
+        // передняя камера
+        if (info.facing == CameraInfo.CAMERA_FACING_FRONT) {
+          result = ((360 - degrees) - info.orientation);
+          result += 360;
+        }
+        result = result % 360;
+        mCamera.setDisplayOrientation(result);
+    }
+
+}
\ No newline at end of file
diff --git a/android/app/src/main/java/com/dinect/checker/activity/MainActivity.java b/android/app/src/main/java/com/dinect/checker/activity/MainActivity.java
index 5f19127..76eadf8 100644
--- a/android/app/src/main/java/com/dinect/checker/activity/MainActivity.java
+++ b/android/app/src/main/java/com/dinect/checker/activity/MainActivity.java
@@ -1,19 +1,17 @@
 package com.dinect.checker.activity;
 
 import android.os.Bundle;
-import android.content.Context;
 import android.content.Intent;
 import android.util.Log;
+import android.content.Context;
 import android.content.SharedPreferences;
 import com.dinect.checker.activity.CameraActivity;
-import com.dinect.checker.service.RegistrationIntentService;
 import io.flutter.app.FlutterActivity;
 import io.flutter.plugins.GeneratedPluginRegistrant;
 import io.flutter.plugin.common.MethodCall;
 import io.flutter.plugin.common.MethodChannel;
 import io.flutter.plugin.common.MethodChannel.MethodCallHandler;
 import io.flutter.plugin.common.MethodChannel.Result;
-import com.google.android.gms.iid.InstanceID;
 import java.util.Map;
 import java.util.ArrayList;
 import java.lang.System;
@@ -43,15 +41,6 @@ public class MainActivity extends FlutterActivity {
                 @Override
                 public void onMethodCall(MethodCall call, Result result) {
                     switch (call.method) {
-                        case "getInstanceID":
-                            InstanceID instanceID = InstanceID.getInstance(MainActivity.this);
-                            String id = instanceID.getId();
-                            if (id != null) {
-                                result.success(id);
-                            } else {
-                                result.error("UNAVAILABLE", "Can't get instanceID.", null);
-                            }
-                            break;
                         case "saveToken":
                             Map tokenArguments = call.arguments();
                             mPreferences.edit().putString(PREF_POS_TOKEN, (String) tokenArguments.get("token")).apply();
diff --git a/android/app/src/main/java/com/dinect/checker/activity/Utils.java b/android/app/src/main/java/com/dinect/checker/activity/Utils.java
new file mode 100644
index 0000000..5a0474a
--- /dev/null
+++ b/android/app/src/main/java/com/dinect/checker/activity/Utils.java
@@ -0,0 +1,16 @@
+package com.dinect.checker.activity;
+
+import android.content.Context;
+import android.net.NetworkInfo;
+import android.net.ConnectivityManager;
+
+public class Utils {
+
+	private Utils() {}
+
+	public static boolean isOnline(Context context) {
+	    ConnectivityManager cm = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
+	    NetworkInfo netInfo = cm.getActiveNetworkInfo();
+	    return netInfo != null && netInfo.isConnected();
+	}
+}
\ No newline at end of file
diff --git a/android/app/src/main/java/com/dinect/checker/service/RegistrationIntentService.java b/android/app/src/main/java/com/dinect/checker/service/RegistrationIntentService.java
deleted file mode 100644
index b801b26..0000000
--- a/android/app/src/main/java/com/dinect/checker/service/RegistrationIntentService.java
+++ /dev/null
@@ -1,24 +0,0 @@
-package com.dinect.checker.service;
-
-import android.app.IntentService;
-import android.content.Intent;
-import android.util.Log;
-import android.support.annotation.Nullable;
-import android.widget.Toast;
-import com.google.android.gms.iid.InstanceID;
-
-import java.io.IOException;
-
-public class RegistrationIntentService extends IntentService {
-
-    public RegistrationIntentService() {
-        super(RegistrationIntentService.class.getName());
-    }
-
-    @Override
-    protected void onHandleIntent(@Nullable Intent intent) {
-        InstanceID instanceID = InstanceID.getInstance(this);
-        String token = instanceID.getId();
-        Log.d("kifio", token);
-    }
-}
\ No newline at end of file
diff --git a/android/app/src/main/res/layout/a_scanner.xml b/android/app/src/main/res/layout/a_scanner.xml
index 59b524f..42ac47c 100644
--- a/android/app/src/main/res/layout/a_scanner.xml
+++ b/android/app/src/main/res/layout/a_scanner.xml
@@ -6,10 +6,6 @@
              android:layout_width="match_parent"
              android:layout_height="match_parent">
 
-    <SurfaceView android:id="@+id/cameraPreview"
-                 android:layout_width="match_parent"
-                 android:layout_height="match_parent"/>
-
     <LinearLayout android:orientation="vertical"
       android:layout_width="match_parent"
       android:layout_height="match_parent">
diff --git a/lib/base_state.dart b/lib/base_state.dart
index b7b9780..23c4021 100644
--- a/lib/base_state.dart
+++ b/lib/base_state.dart
@@ -11,6 +11,8 @@ abstract class BaseState<T> extends State<T> {
   String error = null;
   String textFieldValue = '';
 
+  TextEditingController controller = new TextEditingController();
+
   @override Widget build(BuildContext context) {
     return new Scaffold(appBar: getAppBar(context), body: getBody(context));
   }
diff --git a/lib/faq.dart b/lib/faq.dart
index 62183fc..3143a0b 100644
--- a/lib/faq.dart
+++ b/lib/faq.dart
@@ -79,13 +79,15 @@ class FAQScreenState<T> extends BaseState<FAQScreen> {
     new Entry('ОБЩАЯ ИНФОРМАЦИЯ', commonGuide)
   ];
 
-  static const String registrationGuide = '''После запуска приложения вы окажетесь на странице регистрации магазина. 
+  static const String registrationGuide = '''
+    mPreviewing = true;После запуска приложения вы окажетесь на странице регистрации магазина. 
     Введите DIN код магазина (выдается партнером/менеджером International Auto Club, дублируется на почту)
-    Нажать кнопку:  «Зарегистрировать»
-    Дождитесь подтверждение активации программы, нажатием кнопки “Обновите статус активации” обновите статус.
-    После подтверждения запроса на активацию программы  Партнером/менеджером нажмите кнопкиопку “Завершить регистрацию”, приложение готово к использованию.
+    Кликнете по кнопке:  «Зарегистрировать»
+    Дождитесь подтверждение активации программы, кликом по кнопке «Обновите статус активации» обновите статус.
+    После подтверждения запроса на активацию программы  Партнером/менеджером кликнете по кнопке  «Завершить регистрацию», приложение готово к использованию.
 
-    В случае желания изменить номер кассы, необходимо нажать на “значек” верхнем правом углу и вернуться на шаг регистрации.''';
+    При желании изменить номер кассы, необходимо кликнуть на «значок» верхнем правом углу и вернуться на шаг регистрации.
+  ''';
 
   static const String usageGuide = '''Действие 1:
     При предъявлении покупателем штрих кода участника системы лояльности, запустите данное приложение. 
diff --git a/lib/purchase.dart b/lib/purchase.dart
index 9994e84..c2cc575 100644
--- a/lib/purchase.dart
+++ b/lib/purchase.dart
@@ -2,6 +2,7 @@ import 'package:flutter/material.dart';
 import 'package:flutter/services.dart';
 import 'dart:convert';
 import 'dart:async';
+import 'dart:core';
 
 import 'main.dart';
 import 'common.dart';
@@ -23,9 +24,12 @@ class PurchaseScreen extends StatefulWidget {
 
 class PurchaseScreenState<T> extends BaseState<PurchaseScreen> {
 
+  RegExp exp;
+
   PurchaseScreenState(String userString, String card) {
     this.user = JSON.decode(userString);
     this.card = card;
+    exp = new RegExp(r'''^(?!0\.00)\d{1,11}(\.\d{0,2})?$''');
     getLoyality(user['loyalty_url']);
   }
 
@@ -65,30 +69,36 @@ class PurchaseScreenState<T> extends BaseState<PurchaseScreen> {
 
   /// Смена состояния экрана при изменении текста в поле ввода.
   @override handleUserInput(String tmpString) {
+
     setState(() {
-      double.parse(tmpString);
-      tmpString = tmpString.replaceAll('-', '');
-      tmpString = tmpString.replaceAll(',', '');
-      print(tmpString);
-      if (tmpString.contains('.')) {
-        int dotIndex = tmpString.indexOf('.');
-        integerPart = tmpString.substring(0, dotIndex);
-        fractionalPart = tmpString.substring(dotIndex + 1, tmpString.length);
-        if (fractionalPart.length > 2) {
-          fractionalPart = fractionalPart.substring(0, 2);
+
+      if (tmpString.length == 0 || exp.hasMatch(tmpString)) {
+        if (tmpString.contains('.')) {
+          int dotIndex = tmpString.indexOf('.');
+          integerPart = tmpString.substring(0, dotIndex);
+          fractionalPart = tmpString.substring(dotIndex + 1, tmpString.length);
+          if (fractionalPart.length > 2) {
+            fractionalPart = fractionalPart.substring(0, 2);
+          }
+          controller.text = '${integerPart}.${fractionalPart}';
+        } else {
+          integerPart = tmpString;
+          controller.text = tmpString;
         }
-        controller.text = '${integerPart}.${fractionalPart}';
+        textFieldValue = tmpString;
+
       } else {
-        integerPart = tmpString;
-        controller.text = tmpString;
+        tmpString = tmpString.substring(0, tmpString.length - 1);
+        controller.text = tmpString.replaceAll('a', '');
+        textFieldValue = tmpString;
       }
-      textFieldValue = tmpString;
     });
   }
 
   @override getTextWidget() {
-    return new TextField(decoration: new InputDecoration.collapsed(hintText: getHint(),
+    return new TextField(keyboardType: TextInputType.text, decoration: new InputDecoration.collapsed(hintText: getHint(),
       hintStyle: new TextStyle(color: greyTextColor, fontSize: 16.0)),
+      controller: controller,
       onChanged: (text) => handleUserInput(text));
   }
 
@@ -136,6 +146,10 @@ class PurchaseScreenState<T> extends BaseState<PurchaseScreen> {
       temporaryFractional = temporaryFractional + '0';
     }
 
+    if (temporaryInteger.length == 0) {
+      temporaryInteger = '0';
+    }
+
     return temporaryInteger + '.' + temporaryFractional;
   }