implemented sync process

app/build.gradle

@@ -22,7 +22,7 @@ android {
 dependencies {
     implementation fileTree(dir: 'libs', include: ['*.jar'])
     implementation 'com.android.support:appcompat-v7:27.1.1'
-    implementation 'com.android.support.constraint:constraint-layout:1.1.1'
+    implementation 'com.android.support.constraint:constraint-layout:1.1.2'
     testImplementation 'junit:junit:4.12'
     androidTestImplementation 'com.android.support.test:runner:1.0.2'
     androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
@@ -31,4 +31,5 @@ dependencies {
 
     implementation 'com.android.volley:volley:1.1.0'
     implementation 'com.github.kenglxn.QRGen:android:2.4.0'
+    implementation 'com.google.android.gms:play-services-vision:15.0.2'
 }

app/src/main/AndroidManifest.xml

@@ -2,6 +2,7 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
           package="de.overview.wg.its.mispauth">
 
+	<uses-permission android:name="android.permission.CAMERA"/>
 	<uses-permission android:name="android.permission.INTERNET"/>
 
 	<application
@@ -26,6 +27,7 @@
 				android:parentActivityName=".activity.MainActivity"/>
 
 		<activity
+				android:screenOrientation="portrait"
 				android:name=".activity.SyncActivity"
 				android:label="@string/title_activity_sync"
 				android:parentActivityName=".activity.MainActivity"/>

app/src/main/java/de/overview/wg/its/mispauth/activity/SyncActivity.java

@@ -1,35 +1,38 @@
 package de.overview.wg.its.mispauth.activity;
 
+import android.content.DialogInterface;
+import android.os.Bundle;
 import android.support.v4.app.Fragment;
 import android.support.v4.app.FragmentManager;
-import android.support.v4.app.FragmentStatePagerAdapter;
+import android.support.v4.app.FragmentTransaction;
-import android.support.v4.view.PagerAdapter;
+import android.support.v7.app.AlertDialog;
-import android.support.v4.view.ViewPager;
 import android.support.v7.app.AppCompatActivity;
-import android.os.Bundle;
+import android.support.v7.widget.Toolbar;
+import android.util.Log;
 import android.view.View;
 import android.widget.Button;
-import android.widget.LinearLayout;
-import com.android.volley.VolleyError;
 import de.overview.wg.its.mispauth.R;
+import de.overview.wg.its.mispauth.auxiliary.OrganisationDialog;
 import de.overview.wg.its.mispauth.auxiliary.PreferenceManager;
 import de.overview.wg.its.mispauth.fragment.ScanQrFragment;
 import de.overview.wg.its.mispauth.fragment.ShowQrFragment;
 import de.overview.wg.its.mispauth.fragment.SyncStartFragment;
 import de.overview.wg.its.mispauth.fragment.UploadFragment;
 import de.overview.wg.its.mispauth.model.Organisation;
-import de.overview.wg.its.mispauth.network.MispRequest;
+import org.json.JSONException;
-import de.overview.wg.its.mispauth.custom_viewpager.ExtendedViewPager;
+import org.json.JSONObject;
-import org.json.JSONArray;
 
 public class SyncActivity extends AppCompatActivity {
 
+	private static final String TAG = "DEBUG";
+
 	private PreferenceManager preferenceManager;
 
-	private static final int PAGE_COUNT = 3;
+	private Button prevButton, nextButton;
-	private ExtendedViewPager viewPager;
+	private int partnerChoice = -1;
-	private PagerAdapter pagerAdapter;
+	private String scannedQrString = "";
-	private LinearLayout bottomLayout;
+
+	private int currentFragmentPosition = 0;
 
 
 	@Override
@@ -37,107 +40,131 @@ public class SyncActivity extends AppCompatActivity {
 		super.onCreate(savedInstanceState);
 		setContentView(R.layout.activity_sync);
 
+		Toolbar toolbar = findViewById(R.id.toolbar);
+		setSupportActionBar(toolbar);
+		getSupportActionBar().setDisplayHomeAsUpEnabled(true);
+
 		preferenceManager = PreferenceManager.Instance(this);
 
-		setupViewPager();
+		nextButton = findViewById(R.id.nextButton);
+		prevButton = findViewById(R.id.backButton);
+
+		nextButton.setOnClickListener(new View.OnClickListener() {
+			@Override
+			public void onClick(View v) {
+				getFragment(currentFragmentPosition + 1, true);
+			}
+		});
+		prevButton.setOnClickListener(new View.OnClickListener() {
+			@Override
+			public void onClick(View v) {
+				getFragment(currentFragmentPosition - 1, true);
+			}
+		});
+
+		getFragment(0, false);
 	}
 
-	private void setupViewPager() {
+	private void getFragment(int position, boolean animate) {
-		bottomLayout = findViewById(R.id.linearLayout);
 
-		pagerAdapter = new SimplePagerAdapter(getSupportFragmentManager());
+		FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
 
-		viewPager = findViewById(R.id.viewPager);
+		if (animate) {
-		viewPager.setPagingEnabled(false);
+			if (position > currentFragmentPosition) {
-		viewPager.setAdapter(pagerAdapter);
+				transaction.setCustomAnimations(R.anim.enter_from_right, R.anim.exit_to_left, R.anim.enter_from_left, R.anim.exit_to_right);
+			} else {
+				transaction.setCustomAnimations(R.anim.enter_from_left, R.anim.exit_to_right, R.anim.enter_from_right, R.anim.exit_to_left);
+			}
+		}
 
-		viewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
+		currentFragmentPosition = position;
+
+		switch (position) {
+
+			case 0:
+				prevButton.setEnabled(false);
+				nextButton.setEnabled(false);
+				transaction.replace(R.id.fragmentContainer, new SyncStartFragment());
+				break;
+
+			case 1:
+
+				prevButton.setEnabled(true);
+
+				if (partnerChoice == 1) {
+
+					nextButton.setEnabled(false);
+					transaction.replace(R.id.fragmentContainer, new ScanQrFragment(), "FRAGMENT_SCAN");
 
-			@Override
-			public void onPageSelected(int position) {
-				if (position == 0) {
-					bottomLayout.setVisibility(View.GONE);
 				} else {
-					bottomLayout.setVisibility(View.VISIBLE);
+
+					nextButton.setEnabled(true);
+					transaction.replace(R.id.fragmentContainer, new ShowQrFragment(), "FRAGMENT_SHOW");
+
 				}
-			}
+				break;
 
-			@Override
+			case 2:
-			public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
+				if (partnerChoice == 1) {
 
-			}
+					prevButton.setEnabled(true);
+					nextButton.setEnabled(true);
+					transaction.replace(R.id.fragmentContainer, new ShowQrFragment(), "FRAGMENT_SHOW");
 
-			// SCROLL_STATE_IDLE, SCROLL_STATE_DRAGGING, SCROLL_STATE_SETTLING
+				} else {
-			@Override
-			public void onPageScrollStateChanged(int state) {
 
-			}
+					prevButton.setEnabled(true);
-		});
+					nextButton.setEnabled(false);
 
-		Button next = findViewById(R.id.nextButton);
+					transaction.replace(R.id.fragmentContainer, new ScanQrFragment(), "FRAGMENT_SCAN");
-		Button back = findViewById(R.id.backButton);
+				}
+				break;
 
-		next.setOnClickListener(new View.OnClickListener() {
+			case 3:
-			@Override
-			public void onClick(View v) {
-				viewPager.setCurrentItem(viewPager.getCurrentItem() + 1, true);
-			}
-		});
 
-		back.setOnClickListener(new View.OnClickListener() {
+				nextButton.setText("Finish");
-			@Override
+				nextButton.setEnabled(false);
-			public void onClick(View v) {
+
-				viewPager.setCurrentItem(viewPager.getCurrentItem() - 1, true);
+				transaction.replace(R.id.fragmentContainer, new UploadFragment());
-			}
+
-		});
+				break;
+
+			default:
+				break;
+		}
+		transaction.commit();
 	}
 
-	private class SimplePagerAdapter extends FragmentStatePagerAdapter {
+	public void setPartnerChoice(int choice) {
 
-		public SimplePagerAdapter(FragmentManager fm) {
+		partnerChoice = choice;
-			super(fm);
-		}
 
-		@Override
+		if (choice != -1) {
-		public Fragment getItem(int position) {
+			nextButton.setEnabled(true);
-
+		} else {
-			switch (position) {
+			nextButton.setEnabled(false);
-				case 0:
-					return new SyncStartFragment(); // start fragment
-
-				case 1:
-					return new ScanQrFragment(); // scan fragment
-
-				case 2:
-					return new ShowQrFragment(); // show QR fragment
-
-				case 3:
-					return new UploadFragment(); // show upload fragment
-
-				default:
-					return null; // This should not be happening
-			}
-		}
-
-		@Override
-		public int getCount() {
-			return PAGE_COUNT;
 		}
 	}
 
-	private void uploadOrganisation(Organisation org) {
+	public void setScannedQr(String qr) {
-		MispRequest mispRequest = MispRequest.Instance(this);
 
-		mispRequest.getOrganisations(new MispRequest.OrganisationsCallback() {
+		final FragmentManager manager = getSupportFragmentManager();
-			@Override
+		final ScanQrFragment scanFragment = (ScanQrFragment) manager.findFragmentByTag("FRAGMENT_SCAN");
-			public void onResult(JSONArray organisations) {
 
-			}
+		scanFragment.setReadQr(false);
+		try {
+			OrganisationDialog d = new OrganisationDialog(this);
+			Organisation o = new Organisation();
+			o.fromJSON(new JSONObject(qr));
+			d.createDialog(o);
 
-			@Override
+		} catch (JSONException e) {
-			public void onError(VolleyError volleyError) {
+			e.printStackTrace();
+		}
 
-			}
+	}
-		});
+
+	public void uploadReady() {
+		nextButton.setEnabled(true);
 	}
 }

app/src/main/java/de/overview/wg/its/mispauth/auxiliary/OrganisationDialog.java

@@ -27,6 +27,9 @@ public class OrganisationDialog {
 		TextView title = dialogContent.findViewById(R.id.organisation_title);
 		title.setText(org.getName());
 
+		TextView uuid = dialogContent.findViewById(R.id.organisation_uuid);
+		uuid.setText(org.getUuid());
+
 		TextView description = dialogContent.findViewById(R.id.organisation_description);
 		description.setText(org.getDescription());
 
@@ -39,7 +42,9 @@ public class OrganisationDialog {
 		TextView userCount = dialogContent.findViewById(R.id.organisation_user_count);
 		userCount.setText("" + org.getUserCount());
 
-//		dialogBuilder.setPositiveButton("OK", null);
+		dialogBuilder.setCancelable(false);
+		dialogBuilder.setNegativeButton("REJECT", null);
+		dialogBuilder.setPositiveButton("ACCEPT", null);
 		dialogBuilder.show();
 	}
 }

app/src/main/java/de/overview/wg/its/mispauth/fragment/ScanQrFragment.java

@@ -1,17 +1,361 @@
 package de.overview.wg.its.mispauth.fragment;
 
+import android.Manifest;
+import android.content.Context;
+import android.content.pm.PackageManager;
+import android.graphics.Bitmap;
+import android.graphics.ImageFormat;
+import android.graphics.SurfaceTexture;
+import android.hardware.camera2.*;
+import android.hardware.camera2.params.StreamConfigurationMap;
+import android.media.Image;
+import android.media.ImageReader;
 import android.os.Bundle;
+import android.os.Handler;
+import android.os.HandlerThread;
+import android.renderscript.*;
+import android.support.annotation.NonNull;
+import android.support.v4.app.ActivityCompat;
 import android.support.v4.app.Fragment;
-import android.view.LayoutInflater;
+import android.support.v4.content.ContextCompat;
-import android.view.View;
+import android.util.Size;
-import android.view.ViewGroup;
+import android.util.SparseArray;
+import android.view.*;
+import android.widget.Toast;
+import com.google.android.gms.vision.Frame;
+import com.google.android.gms.vision.barcode.Barcode;
+import com.google.android.gms.vision.barcode.BarcodeDetector;
 import de.overview.wg.its.mispauth.R;
+import de.overview.wg.its.mispauth.activity.SyncActivity;
+
+import java.util.Arrays;
+import java.util.List;
 
 public class ScanQrFragment extends Fragment {
 
+	private static final int CAMERA_REQUEST_CODE = 0;
+
+	private HandlerThread backgroundThread;
+	private Handler backgroundHandler;
+
+	private CameraManager cameraManager;
+	private CameraDevice cameraDevice;
+	private String cameraID;
+	private CameraCaptureSession cameraCaptureSession;
+
+	private SurfaceTexture previewSurfaceTexture;
+	private Surface previewSurface, yuvSurface;
+	private Size[] yuvSizes;
+
+	private BarcodeDetector barcodeDetector;
+	private TextureView previewView;
+
+	private boolean readQr = true;
+
 	public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
 		View v = inflater.inflate(R.layout.fragment_sync_scan, null);
+
+		previewView = v.findViewById(R.id.texture_scan_preview);
+
+		if (ContextCompat.checkSelfPermission(getActivity(), Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED) {
+
+			if (ActivityCompat.shouldShowRequestPermissionRationale(getActivity(), Manifest.permission.CAMERA)) {
+
+			} else {
+				ActivityCompat.requestPermissions(getActivity(), new String[]{Manifest.permission.CAMERA}, CAMERA_REQUEST_CODE);
+			}
+
+		} else {
+			setUpBarcodeDetector();
+			setUpPreviewTexture();
+		}
+
 		return v;
 	}
 
+	@Override
+	public void onRequestPermissionsResult(int requestCode, String permissions[], int[] grantResults) {
+		switch (requestCode) {
+			case CAMERA_REQUEST_CODE: {
+				if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
+					setUpBarcodeDetector();
+					setUpPreviewTexture();
+				} else {
+					Toast.makeText(getActivity(), "Camera permission needed!", Toast.LENGTH_SHORT).show();
+				}
+			}
+		}
+	}
+
+	@Override
+	public void onResume() {
+		super.onResume();
+		openBackgroundThread();
+	}
+
+	@Override
+	public void onStop() {
+		super.onStop();
+		closeCamera();
+		closeBackgroundThread();
+	}
+
+
+	private void returnResult(String qrData) {
+		((SyncActivity) getActivity()).setScannedQr(qrData);
+	}
+
+	private void setUpPreviewTexture() {
+
+		previewView.setSurfaceTextureListener(new TextureView.SurfaceTextureListener() {
+			@Override
+			public void onSurfaceTextureAvailable(SurfaceTexture surface, int width, int height) {
+				surface.setDefaultBufferSize(width, height);
+				previewSurfaceTexture = surface;
+				setUpCamera();
+			}
+
+			@Override
+			public void onSurfaceTextureSizeChanged(SurfaceTexture surface, int width, int height) {
+
+			}
+
+			@Override
+			public boolean onSurfaceTextureDestroyed(SurfaceTexture surface) {
+				return false;
+			}
+
+			@Override
+			public void onSurfaceTextureUpdated(SurfaceTexture surface) {
+
+			}
+		});
+
+	}
+
+	private void setUpCamera() {
+		cameraManager = (CameraManager) getActivity().getSystemService(Context.CAMERA_SERVICE);
+
+		try {
+			for (String cameraId : cameraManager.getCameraIdList()) {
+
+				CameraCharacteristics cameraCharacteristics = cameraManager.getCameraCharacteristics(cameraId);
+				Integer facing = cameraCharacteristics.get(CameraCharacteristics.LENS_FACING);
+
+				if (facing == CameraCharacteristics.LENS_FACING_BACK) {
+
+					cameraID = cameraId;
+
+					StreamConfigurationMap streamConfigurationMap = cameraCharacteristics.get(CameraCharacteristics.SCALER_STREAM_CONFIGURATION_MAP);
+					yuvSizes = streamConfigurationMap.getOutputSizes(ImageFormat.YUV_420_888);
+
+					setUpImageReader();
+				}
+			}
+		} catch (CameraAccessException e) {
+			e.printStackTrace();
+		}
+	}
+
+	private void setUpImageReader() {
+
+		Size yuvSize = yuvSizes[yuvSizes.length - 6];
+
+		ImageReader yuvImageReader = ImageReader.newInstance(yuvSize.getWidth(), yuvSize.getHeight(), ImageFormat.YUV_420_888, 5);
+		ImageReader.OnImageAvailableListener yuvImageListener = new ImageReader.OnImageAvailableListener() {
+
+			@Override
+			public void onImageAvailable(ImageReader reader) {
+
+				if (!readQr) {
+					return;
+				}
+
+				Image lastImage = reader.acquireLatestImage();
+				Bitmap bitmap = YUV2Bitmap(lastImage);
+
+				if (bitmap != null) {
+
+					Frame frame = new Frame.Builder().setBitmap(bitmap).build();
+					SparseArray<Barcode> barcodes = barcodeDetector.detect(frame);
+
+					if (barcodes.size() > 0) {
+						returnResult(barcodes.valueAt(0).rawValue);
+					}
+				}
+
+				if (lastImage != null) {
+					lastImage.close();
+				}
+			}
+		};
+
+		yuvImageReader.setOnImageAvailableListener(yuvImageListener, backgroundHandler);
+
+		previewSurface = new Surface(previewSurfaceTexture);
+		yuvSurface = yuvImageReader.getSurface();
+
+		openCamera();
+	}
+
+	public void openCamera() {
+
+		CameraDevice.StateCallback stateCallback = new CameraDevice.StateCallback() {
+			@Override
+			public void onOpened(@NonNull CameraDevice camera) {
+				cameraDevice = camera;
+				createCaptureSession();
+			}
+
+			@Override
+			public void onDisconnected(@NonNull CameraDevice camera) {
+
+			}
+
+			@Override
+			public void onError(@NonNull CameraDevice camera, int error) {
+
+			}
+		};
+
+		try {
+			if (ActivityCompat.checkSelfPermission(getActivity(), android.Manifest.permission.CAMERA) == PackageManager.PERMISSION_GRANTED) {
+				cameraManager.openCamera(cameraID, stateCallback, backgroundHandler);
+			}
+		} catch (CameraAccessException e) {
+			e.printStackTrace();
+		}
+	}
+
+	private void createCaptureSession() {
+		List<Surface> surfaces = Arrays.asList(previewSurface, yuvSurface);
+
+		CameraCaptureSession.StateCallback captureStateCallback = new CameraCaptureSession.StateCallback() {
+			@Override
+			public void onConfigured(@NonNull CameraCaptureSession session) {
+				cameraCaptureSession = session;
+				createCaptureRequest();
+			}
+
+			@Override
+			public void onConfigureFailed(@NonNull CameraCaptureSession session) {
+
+			}
+		};
+
+		try {
+			cameraDevice.createCaptureSession(surfaces, captureStateCallback, backgroundHandler);
+		} catch (CameraAccessException e) {
+			e.printStackTrace();
+		}
+
+	}
+
+	private void createCaptureRequest() {
+		try {
+
+			CaptureRequest.Builder requestBuilder = cameraDevice.createCaptureRequest(CameraDevice.TEMPLATE_ZERO_SHUTTER_LAG);
+			requestBuilder.addTarget(previewSurface);
+			requestBuilder.addTarget(yuvSurface);
+
+			CameraCaptureSession.CaptureCallback captureCallback = new CameraCaptureSession.CaptureCallback() {
+				@Override
+				public void onCaptureCompleted(@NonNull CameraCaptureSession session, @NonNull CaptureRequest request, @NonNull TotalCaptureResult result) {
+					super.onCaptureCompleted(session, request, result);
+				}
+			};
+
+			cameraCaptureSession.setRepeatingRequest(requestBuilder.build(), captureCallback, backgroundHandler);
+
+		} catch (CameraAccessException e) {
+			e.printStackTrace();
+		}
+	}
+
+	private void openBackgroundThread() {
+		backgroundThread = new HandlerThread("raw_image_available_listener_thread");
+		backgroundThread.start();
+		backgroundHandler = new Handler(backgroundThread.getLooper());
+	}
+
+	private void closeBackgroundThread() {
+		backgroundThread.quitSafely();
+		try {
+			backgroundThread.join();
+			backgroundThread = null;
+			backgroundHandler = null;
+		} catch (InterruptedException e) {
+			e.printStackTrace();
+		}
+	}
+
+	public void closeCamera() {
+		if (cameraCaptureSession != null) {
+			cameraCaptureSession.close();
+			cameraCaptureSession = null;
+		}
+
+		if (cameraDevice != null) {
+			cameraDevice.close();
+			cameraDevice = null;
+		}
+	}
+
+	private void setUpBarcodeDetector() {
+		barcodeDetector = new BarcodeDetector.Builder(getActivity())
+				.setBarcodeFormats(Barcode.QR_CODE)
+				.build();
+
+		if (!barcodeDetector.isOperational()) {
+			Toast.makeText(getActivity(), "Could not setup QR-Code scanner!", Toast.LENGTH_SHORT).show();
+		}
+	}
+
+	private Bitmap YUV2Bitmap(Image image) {
+
+		if (image == null) return null;
+
+		int W = image.getWidth();
+		int H = image.getHeight();
+
+		Image.Plane Y = image.getPlanes()[0];
+		Image.Plane U = image.getPlanes()[1];
+		Image.Plane V = image.getPlanes()[2];
+
+		int Yb = Y.getBuffer().remaining();
+		int Ub = U.getBuffer().remaining();
+		int Vb = V.getBuffer().remaining();
+
+		byte[] data = new byte[Yb + Ub + Vb];
+
+		Y.getBuffer().get(data, 0, Yb);
+		V.getBuffer().get(data, Yb, Vb);
+		U.getBuffer().get(data, Yb + Vb, Ub);
+
+		RenderScript rs = RenderScript.create(getActivity().getApplicationContext());
+
+		ScriptIntrinsicYuvToRGB yuvToRgbIntrinsic = ScriptIntrinsicYuvToRGB.create(rs, Element.U8_4(rs));
+
+		Type.Builder yuvType = new Type.Builder(rs, Element.U8(rs)).setX(data.length);
+		Allocation in = Allocation.createTyped(rs, yuvType.create(), Allocation.USAGE_SCRIPT);
+
+		Type.Builder rgbaType = new Type.Builder(rs, Element.RGBA_8888(rs)).setX(W).setY(H);
+		Allocation out = Allocation.createTyped(rs, rgbaType.create(), Allocation.USAGE_SCRIPT);
+
+
+		final Bitmap bmpout = Bitmap.createBitmap(W, H, Bitmap.Config.ARGB_8888);
+
+		in.copyFromUnchecked(data);
+
+		yuvToRgbIntrinsic.setInput(in);
+		yuvToRgbIntrinsic.forEach(out);
+		out.copyTo(bmpout);
+		image.close();
+		return bmpout;
+	}
+
+	public void setReadQr(boolean enabled) {
+		readQr = enabled;
+	}
+
 }

app/src/main/java/de/overview/wg/its/mispauth/fragment/ShowQrFragment.java

@@ -1,27 +1,52 @@
 package de.overview.wg.its.mispauth.fragment;
 
+import android.graphics.Point;
 import android.os.Bundle;
 import android.support.v4.app.Fragment;
+import android.util.DisplayMetrics;
+import android.view.Display;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
 import android.widget.ImageView;
 import de.overview.wg.its.mispauth.R;
+import de.overview.wg.its.mispauth.auxiliary.PreferenceManager;
 import net.glxn.qrgen.android.QRCode;
 
 public class ShowQrFragment extends Fragment {
 
 	private ImageView qrImageView;
+	private int screenWidth, screenHeight;
 
 	public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
 		View v = inflater.inflate(R.layout.fragment_sync_show, null);
 
+//		DisplayMetrics metrics = new DisplayMetrics();
+//		getActivity().getWindowManager().getDefaultDisplay().getMetrics(metrics);
+//
+//		screenWidth = (int)(metrics.widthPixels * metrics.density);
+//		screenHeight = (int)(metrics.heightPixels * metrics.density);
+
+//		Display display = getActivity().getWindowManager().getDefaultDisplay();
+//		Point size = new Point();
+//		display.getSize(size);
+//		screenWidth = size.x;
+//		screenHeight = size.y;
+
+		screenHeight = getResources().getDisplayMetrics().heightPixels;
+		screenWidth = getResources().getDisplayMetrics().widthPixels;
+
 		qrImageView = v.findViewById(R.id.image_view_qr);
-		setQr("Hallo hier steht leide nur scheiße, aber ansonsten hat alles geklappt!  (Y)");
+
+		PreferenceManager preferenceManager = PreferenceManager.Instance(getActivity());
+		setQr(preferenceManager.getMyOrganisation().toJSON().toString());
+
 		return v;
 	}
 
-	public void setQr(String msg) {
+	private void setQr(String msg) {
-		qrImageView.setImageBitmap(QRCode.from(msg).bitmap());
+		qrImageView.setImageBitmap(QRCode.from(msg)
+				.withSize(screenHeight, screenHeight)
+				.bitmap());
 	}
 }

app/src/main/java/de/overview/wg/its/mispauth/fragment/SyncStartFragment.java

@@ -1,17 +1,33 @@
 package de.overview.wg.its.mispauth.fragment;
 
+import android.app.Activity;
+import android.content.Context;
 import android.os.Bundle;
 import android.support.v4.app.Fragment;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
+import android.widget.RadioGroup;
 import de.overview.wg.its.mispauth.R;
+import de.overview.wg.its.mispauth.activity.SyncActivity;
+
 
 public class SyncStartFragment extends Fragment {
 
+	private static final String TAG = "DEBUG";
+	private RadioGroup radioGroup;
+
 	public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
 		View v = inflater.inflate(R.layout.fragment_sync_start, null);
+		radioGroup = v.findViewById(R.id.radioGroup);
+
+		radioGroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
+			@Override
+			public void onCheckedChanged(RadioGroup group, int checkedId) {
+				((SyncActivity)getActivity()).setPartnerChoice(checkedId % 2);
+			}
+		});
+
 		return v;
 	}
-
 }

app/src/main/java/de/overview/wg/its/mispauth/interfaces/IProcessable.java

@@ -0,0 +1,5 @@
+package de.overview.wg.its.mispauth.interfaces;
+
+public interface IProcessable {
+	boolean isDone();
+}

app/src/main/java/de/overview/wg/its/mispauth/interfaces/ISyncCommunication.java

@@ -0,0 +1,6 @@
+package de.overview.wg.its.mispauth.interfaces;
+
+public interface ISyncCommunication {
+	void setPartnerChoice(int choice);
+	void setScannedQr(String qr);
+}

app/src/main/res/anim/enter_from_left.xml

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="utf-8"?>
+<set xmlns:android="http://schemas.android.com/apk/res/android"
+     android:interpolator="@android:anim/decelerate_interpolator">
+	<translate
+			android:fromXDelta="-100%" android:toXDelta="0%"
+			android:fromYDelta="0%" android:toYDelta="0%"
+			android:duration="300"/>
+</set>

app/src/main/res/anim/enter_from_right.xml

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="utf-8"?>
+<set xmlns:android="http://schemas.android.com/apk/res/android"
+     android:interpolator="@android:anim/decelerate_interpolator">
+	<translate
+			android:fromXDelta="100%" android:toXDelta="0%"
+			android:fromYDelta="0%" android:toYDelta="0%"
+			android:duration="300" />
+</set>

app/src/main/res/anim/exit_to_left.xml

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="utf-8"?>
+<set xmlns:android="http://schemas.android.com/apk/res/android"
+     android:interpolator="@android:anim/decelerate_interpolator">
+	<translate
+			android:fromXDelta="0%" android:toXDelta="-100%"
+			android:fromYDelta="0%" android:toYDelta="0%"
+			android:duration="150"/>
+</set>

app/src/main/res/anim/exit_to_right.xml

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="utf-8"?>
+<set xmlns:android="http://schemas.android.com/apk/res/android"
+     android:interpolator="@android:anim/decelerate_interpolator">
+	<translate
+			android:fromXDelta="0%" android:toXDelta="100%"
+			android:fromYDelta="0%" android:toYDelta="0%"
+			android:duration="150" />
+</set>

app/src/main/res/animator/fade_in.xml

@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="utf-8"?>
+
+<objectAnimator
+		xmlns:android="http://schemas.android.com/apk/res/android"
+		android:interpolator="@android:interpolator/accelerate_quad"
+		android:valueFrom="0"
+		android:valueTo="1"
+		android:propertyName="alpha"
+		android:duration="@android:integer/config_mediumAnimTime"/>

app/src/main/res/drawable/tab_indicator_default.xml

@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="utf-8"?>
+<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
+	<item>
+		<shape
+				android:innerRadius="0dp"
+				android:shape="ring"
+				android:thickness="2dp"
+				android:useLevel="false">
+			<solid android:color="@android:color/darker_gray"/>
+		</shape>
+	</item>
+</layer-list>

app/src/main/res/drawable/tab_indicator_selected.xml

@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="utf-8"?>
+<shape xmlns:android="http://schemas.android.com/apk/res/android"
+		android:innerRadius="0dp"
+		android:shape="ring"
+		android:thickness="4dp"
+		android:useLevel="false" >
+
+	<solid android:color="@color/colorAccent"/>
+</shape>

app/src/main/res/drawable/tab_selector.xml

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="utf-8"?>
+<selector xmlns:android="http://schemas.android.com/apk/res/android">
+
+	<item android:drawable="@drawable/tab_indicator_selected"
+	      android:state_selected="true"/>
+
+	<item android:drawable="@drawable/tab_indicator_default"/>
+</selector>

app/src/main/res/layout/activity_sync.xml

@@ -12,6 +12,7 @@
 		android:background="@color/colorPrimary">
 
 	<android.support.design.widget.AppBarLayout
+			app:elevation="0dp"
 			android:id="@+id/sync.appbar"
 			android:background="@color/colorPrimaryDark"
 			android:layout_width="match_parent"
@@ -35,19 +36,24 @@
 			android:padding="0dp"
 			app:layout_behavior="@string/appbar_scrolling_view_behavior">
 
-		<de.overview.wg.its.mispauth.custom_viewpager.ExtendedViewPager
+
-				android:id="@+id/viewPager"
+		<FrameLayout
-				android:layout_width="match_parent"
+				android:id="@+id/fragmentContainer"
-				android:layout_height="0dp"
+
-				app:layout_constraintTop_toTopOf="parent" app:layout_constraintStart_toStartOf="parent"
+				app:layout_constraintBottom_toTopOf="@+id/linearLayout"
+				app:layout_constraintStart_toStartOf="parent"
 				app:layout_constraintEnd_toEndOf="parent"
-				app:layout_constraintBottom_toTopOf="@+id/linearLayout"/>
+				app:layout_constraintTop_toTopOf="parent"
+				android:layout_width="0dp"
+				android:layout_height="0dp">
+
+		</FrameLayout>
 
 		<LinearLayout
 				android:id="@+id/linearLayout"
 				android:background="@color/colorPrimary"
 				android:layout_width="match_parent"
-				android:layout_height="wrap_content"
+				android:layout_height="56dp"
 				android:orientation="horizontal"
 				app:layout_constraintBottom_toBottomOf="parent"
 				app:layout_constraintStart_toStartOf="parent"
@@ -57,18 +63,26 @@
 			        android:id="@+id/backButton"
 			        android:text="Back"
 			        android:layout_width="wrap_content"
-			        android:layout_height="wrap_content"/>
+			        android:layout_height="match_parent"
+			        android:enabled="false"/>
 
-			<TextView
+			<android.support.design.widget.TabLayout
+					android:id="@+id/tabLayout"
 					android:layout_weight="1"
 					android:layout_width="0dp"
-					android:layout_height="wrap_content"/>
+					android:layout_height="match_parent"
+					app:tabBackground="@drawable/tab_selector"
+					app:tabGravity="center"
+					app:tabIndicatorHeight="0dp">
+
+			</android.support.design.widget.TabLayout>
 
 			<Button style="@style/Widget.AppCompat.Button.Borderless.Colored"
 			        android:id="@+id/nextButton"
 			        android:text="Next"
 			        android:layout_width="wrap_content"
-			        android:layout_height="wrap_content"/>
+			        android:layout_height="match_parent"
+					android:enabled="false"/>
 		</LinearLayout>
 
 	</android.support.constraint.ConstraintLayout>

app/src/main/res/layout/fragment_sync_scan.xml

@@ -1,17 +1,12 @@
 <?xml version="1.0" encoding="utf-8"?>
 <android.support.constraint.ConstraintLayout
 		xmlns:android="http://schemas.android.com/apk/res/android"
-		xmlns:app="http://schemas.android.com/apk/res-auto"
 		android:layout_width="match_parent"
 		android:layout_height="match_parent">
 
-	<TextView
+	<TextureView
-			android:layout_width="wrap_content"
+			android:id="@+id/texture_scan_preview"
-			android:layout_height="wrap_content"
+			android:layout_width="match_parent"
-			android:text="Scan QR"
+			android:layout_height="wrap_content"/>
-			app:layout_constraintEnd_toEndOf="parent" android:layout_marginEnd="8dp"
-			app:layout_constraintStart_toStartOf="parent" android:layout_marginStart="8dp"
-			app:layout_constraintBottom_toBottomOf="parent" android:layout_marginBottom="8dp"
-			app:layout_constraintTop_toTopOf="parent" android:layout_marginTop="8dp"/>
 
 </android.support.constraint.ConstraintLayout>

app/src/main/res/layout/fragment_sync_show.xml

@@ -1,12 +1,22 @@
 <?xml version="1.0" encoding="utf-8"?>
 <android.support.constraint.ConstraintLayout
 		xmlns:android="http://schemas.android.com/apk/res/android"
+		xmlns:app="http://schemas.android.com/apk/res-auto"
 		android:layout_width="match_parent"
 		android:layout_height="match_parent">
 
 	<ImageView
 			android:id="@+id/image_view_qr"
-			android:layout_width="match_parent"
+
-			android:layout_height="match_parent"/>
+			android:layout_width="wrap_content"
+			android:layout_height="0dp"
+
+			android:adjustViewBounds="true"
+			android:scaleType="fitCenter"
+
+			app:layout_constraintTop_toTopOf="parent"
+			app:layout_constraintStart_toStartOf="parent"
+			app:layout_constraintEnd_toEndOf="parent"
+			app:layout_constraintBottom_toBottomOf="parent"/>
 
 </android.support.constraint.ConstraintLayout>

app/src/main/res/layout/fragment_sync_start.xml

@@ -5,32 +5,69 @@
 		android:layout_width="match_parent"
 		android:layout_height="match_parent">
 
-	<ImageView
+	<RadioGroup
-			android:id="@+id/sync_image"
+			android:id="@+id/radioGroup"
-			android:src="@drawable/ic_sync_alpha"
+			android:padding="16dp"
 			android:layout_width="match_parent"
-			android:layout_height="128dp"/>
+			android:layout_height="wrap_content" android:layout_marginBottom="8dp"
+			android:layout_marginTop="8dp"
+			app:layout_constraintTop_toTopOf="parent" app:layout_constraintStart_toStartOf="parent"
+			android:layout_marginStart="8dp" android:layout_marginEnd="8dp" app:layout_constraintEnd_toEndOf="parent"
+			app:layout_constraintBottom_toBottomOf="parent">
 
-	<TextView
+		<TextView
-			android:gravity="center"
+				android:layout_width="match_parent"
-			android:id="@+id/help_text_sync"
+				android:layout_height="wrap_content"
-			android:text="I am partner"
+				android:layout_marginBottom="8dp"
-			android:layout_width="match_parent"
+				android:textSize="20sp"
-			android:layout_height="wrap_content"
+				android:textStyle="bold"
-			app:layout_constraintTop_toBottomOf="@+id/sync_image"/>
+				android:text="How would you like to start?"/>
 
-	<Button style="@style/CustomButton"
+		<TextView
-	        android:id="@+id/button_scan"
+				android:layout_width="match_parent"
-	        android:text="Scan"
+				android:layout_height="wrap_content"
-	        android:layout_width="match_parent"
+				android:layout_marginBottom="16dp"
-	        android:layout_height="wrap_content" android:layout_marginBottom="8dp"
+				android:textSize="17sp"
-	        app:layout_constraintBottom_toTopOf="@+id/button_share"/>
+				android:text="Make sure your partner will choose the opposite option."/>
 
-	<Button style="@style/CustomButton"
+		<RadioButton
-	        android:id="@+id/button_share"
+				android:layout_width="match_parent"
-	        android:text="Share"
+				android:layout_height="56dp"
-	        android:layout_width="match_parent"
+				android:text="Scan QR-Code first"/>
-	        android:layout_height="wrap_content" android:layout_marginBottom="8dp"
+
-	        app:layout_constraintBottom_toBottomOf="parent"/>
+		<RadioButton
+				android:layout_width="match_parent"
+				android:layout_height="56dp"
+				android:text="Share QR-Code first"/>
+	</RadioGroup>
+
+
+	<!--<ImageView-->
+	<!--android:id="@+id/sync_image"-->
+	<!--android:src="@drawable/ic_sync_alpha"-->
+	<!--android:layout_width="match_parent"-->
+	<!--android:layout_height="128dp"/>-->
+
+	<!--<TextView-->
+	<!--android:gravity="center"-->
+	<!--android:id="@+id/help_text_sync"-->
+	<!--android:text="I am partner"-->
+	<!--android:layout_width="match_parent"-->
+	<!--android:layout_height="wrap_content"-->
+	<!--app:layout_constraintTop_toBottomOf="@+id/sync_image"/>-->
+
+	<!--<Button style="@style/CustomButton"-->
+	<!--android:id="@+id/button_scan"-->
+	<!--android:text="Scan"-->
+	<!--android:layout_width="match_parent"-->
+	<!--android:layout_height="wrap_content" android:layout_marginBottom="8dp"-->
+	<!--app:layout_constraintBottom_toTopOf="@+id/button_share"/>-->
+
+	<!--<Button style="@style/CustomButton"-->
+	<!--android:id="@+id/button_share"-->
+	<!--android:text="Share"-->
+	<!--android:layout_width="match_parent"-->
+	<!--android:layout_height="wrap_content" android:layout_marginBottom="8dp"-->
+	<!--app:layout_constraintBottom_toBottomOf="parent"/>-->
 
 </android.support.constraint.ConstraintLayout>