how to create qr code reader in android studio
In this article today learn how to create qr code reader in
android studio so lets
start tutorial.
What is barcode scanner:
Clients new
to barcoding typically take, `` What is the barcode reader? '' The statement is
simple: The barcode scanner—also called The barcode reader—is The electronic
device that decodes and physically captures data contained at barcodes. It
comprises of the following elements, which work together to gather the
information contained in the printed barcode:
The barcode
reader (or barcode reader) is the machine peripheral for reading barcodes
published on different surfaces. The barcode reader consists of a detector, a
decoder (either built-in or external) , and the wire used to connect the
audience with the computer. Additionally, almost all barcode readers currently
created contain decoder circuitry examining the barcode’s picture information
offered by the image conductor and mailing the barcode’s message to the
scanner’s output port. CCD readers: CCD (cost Coupled Device) readers (also
referred to as LED reader) have the array of hundreds of small fluorescent
detectors lined up in one line in the head of the reader. This significant
difference between the CCD audience and the pen or laser reader is that this
CCD audience is evaluating emitted ambient lighting from this room code whereas
pen or laser scanners are measuring reflected light of a specific frequency
originating from the scanner itself.
Follow the
full source code how to create qr code reader in
android studio:
1.build.gradle:
implementation 'com.google.android.gms:play-services-vision:11.8.0'
2.MainActivity.java:
package com.akash.barcodescanner;
import androidx.appcompat.app.AppCompatActivity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
public class MainActivity extends AppCompatActivity {
Button btnScanBarcode;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btnScanBarcode = findViewById(R.id.btnScanBarcode);
btnScanBarcode.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
startActivity(new Intent(MainActivity.this, ScannedBarcodeActivity.class));
}
});
}
}
3.activity_main.xml:
<?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"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<Button
android:id="@+id/btnScanBarcode"
android:layout_width="300dp"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_marginBottom="44dp"
android:layout_marginEnd="8dp"
android:layout_marginStart="8dp"
android:text="@string/scan_barcode"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.676"
app:layout_constraintStart_toStartOf="parent" />
</android.support.constraint.ConstraintLayout>
4.ScannedBarcodeActivity.java:
package com.akash.barcodescanner;
import android.Manifest;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.net.Uri;
import android.os.Bundle;
import android.util.SparseArray;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.app.ActivityCompat;
import com.google.android.gms.vision.CameraSource;
import com.google.android.gms.vision.Detector;
import com.google.android.gms.vision.barcode.Barcode;
import com.google.android.gms.vision.barcode.BarcodeDetector;
import java.io.IOException;
public class ScannedBarcodeActivity extends AppCompatActivity {
SurfaceView surfaceView;
TextView txtBarcodeValue;
private BarcodeDetector barcodeDetector;
private CameraSource cameraSource;
private static final int REQUEST_CAMERA_PERMISSION = 201;
Button btnAction;
String intentData = "";
boolean isEmail = false;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_scanned_barcode);
initViews();
}
private void initViews() {
txtBarcodeValue = findViewById(R.id.txtBarcodeValue);
surfaceView = findViewById(R.id.surfaceView);
btnAction = findViewById(R.id.btnAction);
btnAction.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (intentData.length() > 0) {
if (isEmail)
startActivity(new Intent(ScannedBarcodeActivity.this, EmailActivity.class).putExtra("email_address", intentData));
else {
startActivity(new Intent(Intent.ACTION_VIEW, Uri.parse(intentData)));
}
}
}
});
}
private void initialiseDetectorsAndSources() {
Toast.makeText(getApplicationContext(), "Barcode scanner started", Toast.LENGTH_SHORT).show();
barcodeDetector = new BarcodeDetector.Builder(this)
.setBarcodeFormats(Barcode.ALL_FORMATS)
.build();
cameraSource = new CameraSource.Builder(this, barcodeDetector)
.setRequestedPreviewSize(1920, 1080)
.setAutoFocusEnabled(true) //you should add this feature
.build();
surfaceView.getHolder().addCallback(new SurfaceHolder.Callback() {
@Override
public void surfaceCreated(SurfaceHolder holder) {
try {
if (ActivityCompat.checkSelfPermission(ScannedBarcodeActivity.this, Manifest.permission.CAMERA) == PackageManager.PERMISSION_GRANTED) {
cameraSource.start(surfaceView.getHolder());
} else {
ActivityCompat.requestPermissions(ScannedBarcodeActivity.this, new
String[]{Manifest.permission.CAMERA}, REQUEST_CAMERA_PERMISSION);
}
} catch (IOException e) {
e.printStackTrace();
}
}
@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
}
@Override
public void surfaceDestroyed(SurfaceHolder holder) {
cameraSource.stop();
}
});
barcodeDetector.setProcessor(new Detector.Processor<Barcode>() {
@Override
public void release() {
Toast.makeText(getApplicationContext(), "To prevent memory leaks barcode scanner has been stopped", Toast.LENGTH_SHORT).show();
}
@Override
public void receiveDetections(Detector.Detections<Barcode> detections) {
final SparseArray<Barcode> barcodes = detections.getDetectedItems();
if (barcodes.size() != 0) {
txtBarcodeValue.post(new Runnable() {
@Override
public void run() {
if (barcodes.valueAt(0).email != null) {
txtBarcodeValue.removeCallbacks(null);
intentData = barcodes.valueAt(0).email.address;
txtBarcodeValue.setText(intentData);
isEmail = true;
btnAction.setText("ADD CONTENT TO THE MAIL");
} else {
isEmail = false;
btnAction.setText("LAUNCH URL");
intentData = barcodes.valueAt(0).displayValue;
txtBarcodeValue.setText(intentData);
}
}
});
}
}
});
}
@Override
protected void onPause() {
super.onPause();
cameraSource.release();
}
@Override
protected void onResume() {
super.onResume();
initialiseDetectorsAndSources();
}
}
5.activity_scanned_barcode.xml:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:padding="@dimen/activity_horizontal_margin">
<SurfaceView
android:id="@+id/surfaceView"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_above="@+id/btnAction"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_centerVertical="true" />
<TextView
android:id="@+id/txtBarcodeValue"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_marginLeft="@dimen/activity_horizontal_margin"
android:layout_marginStart="@dimen/activity_horizontal_margin"
android:text="No Barcode Detected"
android:textColor="@android:color/white"
android:textSize="20sp" />
<Button
android:id="@+id/btnAction"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:text="ADD CONTENT IN THE MAIL" />
</RelativeLayout>
6.EmailActivity.java:
package com.akash.barcodescanner;
import androidx.appcompat.app.AppCompatActivity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
public class EmailActivity extends AppCompatActivity implements View.OnClickListener {
EditText inSubject, inBody;
TextView txtEmailAddress;
Button btnSendEmail;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_email);
initViews();
}
private void initViews() {
inSubject = findViewById(R.id.inSubject);
inBody = findViewById(R.id.inBody);
txtEmailAddress = findViewById(R.id.txtEmailAddress);
btnSendEmail = findViewById(R.id.btnSendEmail);
if (getIntent().getStringExtra("email_address") != null) {
txtEmailAddress.setText("Recipient : " + getIntent().getStringExtra("email_address"));
}
btnSendEmail.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent(Intent.ACTION_SEND);
intent.setType("text/plain");
intent.putExtra(Intent.EXTRA_EMAIL, new String[]{txtEmailAddress.getText().toString()});
intent.putExtra(Intent.EXTRA_SUBJECT, inSubject.getText().toString().trim());
intent.putExtra(Intent.EXTRA_TEXT, inBody.getText().toString().trim());
startActivity(Intent.createChooser(intent, "Send Email"));
}
});
}
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.btnScanBarcode:
startActivity(new Intent(EmailActivity.this, ScannedBarcodeActivity.class));
break;
}
}
}
7.activity_email.xml:
<?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"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".EmailActivity">
<Button
android:id="@+id/btnSendEmail"
android:layout_width="300dp"
android:layout_height="wrap_content"
android:layout_below="@+id/inBody"
android:layout_centerHorizontal="true"
android:layout_marginBottom="64dp"
android:layout_marginEnd="8dp"
android:layout_marginStart="8dp"
android:text="@string/send_email"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent" />
<TextView
android:id="@+id/txtEmailAddress"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_marginBottom="8dp"
android:layout_marginEnd="8dp"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
android:text="Email Address: "
android:textSize="16dp"
android:textStyle="bold"
app:layout_constraintBottom_toTopOf="@+id/inSubject"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<EditText
android:id="@+id/inSubject"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="@+id/txtEmailAddress"
android:layout_centerHorizontal="true"
android:layout_marginEnd="8dp"
android:layout_marginStart="8dp"
android:layout_marginTop="88dp"
android:ems="10"
android:hint="Subject"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<EditText
android:id="@+id/inBody"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="@+id/inSubject"
android:layout_centerHorizontal="true"
android:layout_marginEnd="8dp"
android:layout_marginStart="8dp"
android:layout_marginTop="164dp"
android:ems="10"
android:hint="Body"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="1.0"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</android.support.constraint.ConstraintLayout>
8.AndroidManifest.xml:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.akash.barcodescanner">
<uses-feature
android:name="android.hardware.camera"
android:required="true" />
<uses-permission android:name="android.permission.CAMERA" />
<uses-feature android:name="android.hardware.camera.autofocus" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.INTERNET" />
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity android:name=".EmailActivity"></activity>
<activity android:name=".ScannedBarcodeActivity" />
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
9.strings.xml:
<resources>
<string name="app_name">Barcode scanner</string>
<string name="scan_barcode">scan_barcode</string>
<string name="send_email">send_email</string>
</resources>
10.dimens.xml:
<resources>
<!-- Default screen margins, per the Android Design guidelines. -->
<dimen name="activity_horizontal_margin">16dp</dimen>
<dimen name="activity_vertical_margin">16dp</dimen>
</resources>
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