Failed to start qrCode Camera scanner in fragment
I have two Fragments
and in one of them I want to have a QRcode scanner (using ZXingScannerView
). However, the camera won't start and all I see is a black screen. Here is my implementation:
QRCodeReaderFragment.java
private ZXingScannerView mScannerView;
private LinearLayout qrCameraLayout;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View fragmentView = inflater.inflate(R.layout.fragment_qr_code_reader, container, false);
qrCameraLayout = (LinearLayout) fragmentView.findViewById(R.id.ll_qrcamera);
mScannerView = new ZXingScannerView(getActivity().getApplicationContext());
mScannerView.setLayoutParams(new LinearLayout.LayoutParams(
LinearLayout.LayoutParams.MATCH_PARENT,
LinearLayout.LayoutParams.MATCH_PARENT));
qrCameraLayout.addView(mScannerView);
return fragmentView;
}
fragment_qr_code_reader.xml
<FrameLayout 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"
tools:context="com.letsguang.android.shoppingmalltenant.fragment.QrCodeReaderFragment"
android:id="@+id/fl_qrcamera"
>
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:id="@+id/ll_qrcamera"
android:orientation="vertical">
</LinearLayout>
</FrameLayout>
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2 answers
You have not configured the view. According to the documentation from https://github.com/dm77/barcodescanner you need to start / stop the camera in onResume / onPause:
@Override
public void onResume() {
super.onResume();
mScannerView.setResultHandler(this);
mScannerView.startCamera();
}
@Override
public void onPause() {
super.onPause();
mScannerView.stopCamera();
}
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