我有两个碎片,其中一个我想要一个QRcode扫描仪(使用ZXingScannerView).但是,相机无法启动,我只能看到黑屏.这是我的实现:
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>
解决方法
您没有设置视图.根据
https://github.com/dm77/barcodescanner的文档,您必须在onResume / onPause中启动/停止相机:
@Override public void onResume() { super.onResume(); mScannerView.setResultHandler(this); mScannerView.startCamera(); } @Override public void onPause() { super.onPause(); mScannerView.stopCamera(); }