misp-bump/app/src/main/java/de/korrelator/overview/mispauth/MainActivity.java

package de.korrelator.overview.mispauth;

import android.app.Activity;
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {

    private static final int QR_REQUEST_CODE = 123;
    private TextView qrResult;

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

        qrResult = findViewById(R.id.text_view_qr_result);

        Button scanButton = findViewById(R.id.button_scan);
        scanButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                startCameraIntent();
            }
        });

        Button generateButton = findViewById(R.id.button_generate);
        generateButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                startQrIntent();
            }
        });
    }


    private void startCameraIntent(){
        Intent intent = new Intent(this, ReadQrActivity.class);
        startActivityForResult(intent, QR_REQUEST_CODE);
    }


    private void startQrIntent(){
        Intent intent = new Intent(this, GenerateQrActivity.class);
        startActivity(intent);
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {

        if (requestCode == QR_REQUEST_CODE) {
            if(resultCode == Activity.RESULT_OK){
                String result = data.getStringExtra("result");
                qrResult.setText(result);
            }

            if (resultCode == Activity.RESULT_CANCELED) {
                qrResult.setText("NO QR FOUND");
            }
        }
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.menu_main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        int id = item.getItemId();

        if (id == R.id.action_settings) {
            startActivity(new Intent(this, SettingsActivity.class));
            return true;
        }

        return super.onOptionsItemSelected(item);
    }
}