QR.java

package com.android.iliConnect;

import com.android.iliConnect.Exceptions.CoursePasswordException;
import com.android.iliConnect.Exceptions.JoinCourseException;
import com.android.iliConnect.Exceptions.NetworkException;
import com.android.iliConnect.dataproviders.LocalCourseProvider;
import com.android.iliConnect.message.IliOnClickListener;

import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.LinearLayout;
import android.widget.Toast;
import com.android.iliConnect.MessageBuilder;

public class QR extends Fragment implements Redrawable, IliOnClickListener {
	
	private Object insancte = this;
	// Attribute zum Speichern der Daten aus gescanntem QR
	private String courseName = null;
	private String courseId = null;
	private String coursePassword = null;

	public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
		if (container == null) {
			// We have different layouts, and in one of them this
			// fragment's containing frame doesn't exist. The fragment
			// may still be created from its saved state, but there is
			// no reason to try to create its view hierarchy because it
			// won't be displayed. Note this is not needed -- we could
			// just run the code below, where we would create and return
			// the view hierarchy; it would just never be used.
			return null;
		}
		LinearLayout mLinearLayout = (LinearLayout) inflater.inflate(R.layout.qr_layout, container, false);

		Button mButton = (Button) mLinearLayout.findViewById(R.id.scannow);
		mButton.setOnClickListener(new OnClickListener() {
			public void onClick(View v) {

				int REQUEST_SCAN = 0; // Request code for Intent result
				String packageString = "com.android.iliConnect";

				Intent intent = new Intent("com.google.zxing.client.android.SCAN");
				intent.setPackage(packageString);
				// Add any optional extras to pass
				// e.g.
				// intent.putExtra("SCAN_FORMATS", "EAN13");
				// intent.putExtra("SCAN_FORMATS", "EAN8");
				intent.putExtra("SCAN_MODE", "QR_CODE_MODE");
				
				// Launch
				startActivityForResult(intent, REQUEST_SCAN);
			}
		});

		return mLinearLayout;
	}

	public void onActivityResult(int requestCode, int resultCode, Intent intent) {
		if (requestCode == 0) {
			if (resultCode != 0) {
				String contents = intent.getStringExtra("SCAN_RESULT");
				String format = intent.getStringExtra("SCAN_RESULT_FORMAT");

				// Format: Kursname;ref_id;Passwort (falls vorhanden)
				String qrString[] = contents.split(";");
				
				int count = qrString.length;
				// Falls qrString weniger als 2 Elemente hat ist er ungültig
				if(count < 2) {
					MessageBuilder.QR_error(MainTabView.instance);
					return;
				}
				courseName = qrString[0];
				courseId = qrString[1];
				
				// Password evtl. nicht angegeben, dann nur 2 Elemente in qrString
				if(count == 3) {
					coursePassword = qrString[2];
				}

				// ref_id darf nur aus Zahlen bestehen
				if (courseId.matches("[0-9]+") && courseName.matches("[a-zA-Z0-9 ]+")) {
					MessageBuilder.course_login(MainTabView.instance, courseName, courseId, (IliOnClickListener) insancte);
				} else {
					MessageBuilder.QR_error(MainTabView.instance);
				}
			} else if (resultCode == 0) {
				// Handle cancel
			}
		}
	}

	private void joinCourse(String ref_id, String crs_pw) {
		LocalCourseProvider local = new LocalCourseProvider();
		try {
			String result = null;
			result = local.joinCourse(ref_id, crs_pw);
			
			// Falls Passwort für Anmeldung benötigt wird, Abfrage einblenden
			if (result != null && result.contains("PASSWORD_NEEDED")) {
				MessageBuilder.course_password(MainTabView.instance, ref_id, this);
			}
		} catch (JoinCourseException e) {
			MessageBuilder.course_alreadysignedin(MainTabView.instance);

		} catch (CoursePasswordException e) {
			System.out.println(e.getMessage());

		} catch (NetworkException e) {
			MessageBuilder.exception_message(MainTabView.instance, e.getMessage());
		}
	}

	public void refreshViews() {
		// TODO Auto-generated method stub
	}

	public void onClickCoursePassword(String refID, String password) {
		// Hier wird das Passwort aus der Passwortabfrage verwendet.
		this.joinCourse(refID, password);
	}

	public void onClickLeftCourse(String refID, String courseName) {
		// TODO: Kurs abmelden mit REFID
	}

	public void onClickJoinCourse(String refID, String courseName) {
		// TODO: Anmeldung mit Join Course(refID);
		this.joinCourse(refID, this.coursePassword);

	}

	public void onClickMessageBox() {
		// TODO Auto-generated method stub
	}

}