zxing 을 이용하여 QR코드를 스캔하는 방법에 대한 코드 작성에 필요한 핵심 내용을 기술한다.
앱 build.gradle
dependencies {
implementation fileTree(dir: "libs", include: ["*.jar"])
implementation 'androidx.appcompat:appcompat:1.2.0'
implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
implementation 'com.journeyapps:zxing-android-embedded:3.6.0'
implementation 'gun0912.ted:tedpermission:2.0.0'
implementation 'com.google.android.material:material:1.1.0'
}
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AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
package="com.link2me.android.qrcodesample">
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission
android:name="android.permission.REQUEST_INSTALL_PACKAGES"
tools:ignore="ProtectedPermissions" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<application
android:allowBackup="false"
android:hardwareAccelerated="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/AppTheme"
android:usesCleartextTraffic="true">
<activity android:name=".MainActivity"
android:screenOrientation="portrait"/>
<activity
android:name="com.journeyapps.barcodescanner.CaptureActivity"
android:screenOrientation="portrait"
tools:replace="screenOrientation" />
<activity android:name=".SplahActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name=".ScanQRActivity"
android:screenOrientation="portrait"/>
</application>
</manifest>
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ScanQRActivity.java
public class ScanQRActivity extends AppCompatActivity {
private final String TAG = this.getClass().getSimpleName();
private IntentIntegrator qrScan;
Context mContext;
String QRcode;
TextView textView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_scanqr);
mContext = ScanQRActivity.this;
qrScan = new IntentIntegrator(this);
qrScan.setOrientationLocked(false);
qrScan.setPrompt("QRcode Sample!");
qrScan.initiateScan();
textView = findViewById(R.id.textView);
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
IntentResult result = IntentIntegrator.parseActivityResult(requestCode, resultCode, data);
if(result != null) {
if(result.getContents() == null) {
Toast.makeText(this, "Cancelled", Toast.LENGTH_LONG).show();
Intent intent = new Intent(ScanQRActivity.this, MainActivity.class);
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(intent);
finish();
} else {
if(result.getContents() != null) {
QRcode = result.getContents();
PrefsHelper.write("QRCode",result.getContents());
// QRcode 결과를 가지고 서버에서 정보를 조회하여 가져오거나, 다른 처리를 하면 된다.
// QRcode 읽은 결과를 화면에 표시
textView.setText(QRcode);
}
}
} else {
super.onActivityResult(requestCode, resultCode, data);
}
}
}
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resource 등 코드 세부적인 사항은 https://github.com/jsk005/JavaProjects/tree/master/qrcodesample 를 참조하시길.
