QrScanActivity.java

package org.awesomeapp.messenger.ui.qr;

import static android.content.pm.ActivityInfo.SCREEN_ORIENTATION_NOSENSOR;
import static android.graphics.Color.BLACK;
import static android.graphics.Color.WHITE;
import static android.view.Gravity.CENTER;
import static android.view.View.GONE;
import static android.view.View.VISIBLE;
import static android.view.ViewGroup.LayoutParams.MATCH_PARENT;
import static android.view.ViewGroup.LayoutParams.WRAP_CONTENT;
import static android.widget.ImageView.ScaleType.FIT_CENTER;
import static android.widget.LinearLayout.HORIZONTAL;
import static android.widget.LinearLayout.VERTICAL;
import im.zom.messenger.R;

import android.Manifest;
import android.app.Activity;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.hardware.Camera;
import android.os.Bundle;
import android.support.design.widget.Snackbar;
import android.support.v4.app.ActivityCompat;
import android.support.v4.content.ContextCompat;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.Display;
import android.view.View;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.LinearLayout.LayoutParams;
import android.widget.Toast;

import com.google.zxing.BarcodeFormat;
import com.google.zxing.Result;

import org.awesomeapp.messenger.ImApp;
import org.awesomeapp.messenger.ui.BaseActivity;
import org.awesomeapp.messenger.ui.onboarding.OnboardingManager;

import java.util.ArrayList;

@SuppressWarnings("deprecation")
public class QrScanActivity extends BaseActivity
implements QrCodeDecoder.ResultCallback {

	private static String TAG = QrScanActivity.class.getPackage().getName();

	private CameraView cameraView = null;
	private LinearLayout cameraBorder = null;
	private LinearLayout layoutMain = null;

	private Camera camera = null;
	private boolean gotResult = false;

	private Intent dataResult = new Intent();
	ArrayList<String> resultStrings = new ArrayList<String>();

	private final static int MY_PERMISSIONS_REQUEST_CAMERA = 1;

	@Override
	protected void onCreate(Bundle state) {
        super.onCreate(state);

        setRequestedOrientation(SCREEN_ORIENTATION_NOSENSOR);

        getSupportActionBar().hide();

        int permissionCheck = ContextCompat.checkSelfPermission(this,
                Manifest.permission.CAMERA);

        if (permissionCheck == PackageManager.PERMISSION_DENIED) {
            // Should we show an explanation?
            if (ActivityCompat.shouldShowRequestPermissionRationale(this,
                    Manifest.permission.CAMERA)) {

                finish();

            } else {

                // No explanation needed, we can request the permission.

                ActivityCompat.requestPermissions(this,
                        new String[]{Manifest.permission.CAMERA},
                        MY_PERMISSIONS_REQUEST_CAMERA);

                // MY_PERMISSIONS_REQUEST_READ_CONTACTS is an
                // app-defined int constant. The callback method gets the
                // result of the request.

            }
        }
        else
        {
            init ();
        }
    }

    @Override
    public void onRequestPermissionsResult(int requestCode,
                                           String permissions[], int[] grantResults) {
        switch (requestCode) {
            case MY_PERMISSIONS_REQUEST_CAMERA: {
                // If request is cancelled, the result arrays are empty.
                if (grantResults.length > 0
                        && grantResults[0] == PackageManager.PERMISSION_GRANTED) {

                    // permission was granted, yay! Do the
                    // contacts-related task you need to do.
                    init();

                } else {

                    finish();
                    // permission denied, boo! Disable the
                    // functionality that depends on this permission.
                }
                return;
            }

            // other 'case' lines to check for other
            // permissions this app might request
        }
    }

    private void init ()
    {

		String qrData = getIntent().getStringExtra(Intent.EXTRA_TEXT);

		cameraView = new CameraView(this);
		cameraBorder = new LinearLayout(this);
		cameraBorder.setGravity(CENTER);
		cameraBorder.setBackgroundColor(BLACK);
		cameraBorder.setLayoutParams(new LayoutParams(MATCH_PARENT,
				WRAP_CONTENT, 1f));
		cameraBorder.addView(cameraView);

		ImageView qrCodeView = new ImageView(this);

		qrCodeView.setScaleType(FIT_CENTER);
		qrCodeView.setBackgroundColor(WHITE);
		qrCodeView.setLayoutParams(new LayoutParams(MATCH_PARENT,
				WRAP_CONTENT, 1f));

		Display display = getWindowManager().getDefaultDisplay();
		boolean portrait = display.getWidth() < display.getHeight();
		layoutMain = new LinearLayout(this);
		if(portrait) layoutMain.setOrientation(VERTICAL);
		else layoutMain.setOrientation(HORIZONTAL);
		layoutMain.setWeightSum(2);
		layoutMain.addView(cameraBorder);
		layoutMain.addView(qrCodeView);
		setContentView(layoutMain);

		new QrGenAsyncTask(this, qrCodeView, display.getWidth()).executeOnExecutor(ImApp.sThreadPoolExecutor,qrData);
	}

	@Override
	protected void onResume() {
		super.onResume();
		openCamera();
	}

	@Override
	protected void onPause() {
		super.onPause();
		releaseCamera();
	}

	private void openCamera() {
		Log.d(TAG, "Opening camera");
		try {

			camera = Camera.open();

			cameraView.start(camera, new QrCodeDecoder(this), 0, true);
		} catch(Exception e) {
			Log.e(TAG, "Error opening camera", e);
			
		}
	}

	private void releaseCamera() {
		Log.d(TAG, "Releasing camera");
		try {
			cameraView.stop();
			camera.release();
		} catch(Exception e) {
			Log.e(TAG, "Error releasing camera", e);
			
		}
	}


	public void handleResult(final Result result) {
		runOnUiThread(new Runnable() {
			public void run() {

				gotResult = true;

				String resultString = result.getText();

                if (!resultStrings.contains(resultString)) {

                    resultStrings.add(resultString);
                    dataResult.putStringArrayListExtra("result", resultStrings);

                    String[] parts = OnboardingManager.decodeInviteLink(resultString);

					String message = null;

                    if (parts != null) {

						message = getString(R.string.add_contact_success,parts[0]);


                    } else {
						message = getString(R.string.add_contact_success,resultString);

					}

					if (message != null)
					{
						Snackbar.make(layoutMain, message, Snackbar.LENGTH_LONG).show();
					}

                    setResult(RESULT_OK, dataResult);
                }

			}
		});
	}
}