我正在尝试使这个应用程序扫描一本书的ISBC，然后发出一个http请求来获取该书的标题和其他细节。
我使用 rootView.findViewById（R.id.scan_button）..... 启动了相机。现在我想记录条形码和代码格式，以确保它在 onActivityResult 中工作，但它没有记录或进行祝酒。在相机对焦代码后相机活动关闭并返回到我有按钮的视图，以启动扫描功能，但不记录任何内容或进行任何烘烤。我之前使用过这个教程 - http://code.tutsplus.com/tutorials/android-sdk-create-a-barcode-reader--mobile-17162 - 看看zXing是如何工作的，教程工作得很好，现在我正在尝试实现一些代码。
rootView.findViewById(R.id.scan_button).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
IntentIntegrator scanIntegrator = new IntentIntegrator(getActivity());
scanIntegrator.setBeepEnabled(true);
scanIntegrator.setBarcodeImageEnabled(true);
scanIntegrator.setPrompt("Scan a barcode");
scanIntegrator.initiateScan();
}
});
public void onActivityResult(int requestCode, int resultCode, Intent intent) {
//retrieve scan result
IntentResult scanningResult = IntentIntegrator.parseActivityResult(requestCode, resultCode, intent);
if (scanningResult != null) {
//we have a result
String scanContent = scanningResult.getContents();
String scanFormat = scanningResult.getFormatName();
formatTxt.setText("FORMAT: " + scanFormat);
contentTxt.setText("CONTENT: " + scanContent);
Log.i("FORMAT ", scanFormat);
Log.i("CONTENT", scanContent);
Log.i("xZing", "contents: "+scanContent+" format: "+scanFormat);
Toast.makeText(getActivity(), "FORMAT " + scanFormat + " CONTENT " + scanContent, Toast.LENGTH_LONG).show();
}else{
Toast toast = Toast.makeText(getActivity(),
"No scan data received!", Toast.LENGTH_SHORT);
toast.show();
}
}
完整代码
public class AddBook extends Fragment implements LoaderManager.LoaderCallbacks<Cursor> {
private static final String TAG = "INTENT_TO_SCAN_ACTIVITY";
private EditText ean;
private final int LOADER_ID = 1;
private View rootView;
private final String EAN_CONTENT="eanContent";
private static final String SCAN_FORMAT = "scanFormat";
private static final String SCAN_CONTENTS = "scanContents";
private String mScanFormat = "Format:";
private String mScanContents = "Contents:";
private Button scanBtn;
private TextView formatTxt, contentTxt;
public AddBook(){
}
@Override
public void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
if(ean!=null) {
outState.putString(EAN_CONTENT, ean.getText().toString());
}
}
@Override
public View onCreateView(final LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
rootView = inflater.inflate(R.layout.fragment_add_book, container, false);
ean = (EditText) rootView.findViewById(R.id.ean);
formatTxt = (TextView)rootView.findViewById(R.id.scan_format);
contentTxt = (TextView)rootView.findViewById(R.id.scan_content);
ean.addTextChangedListener(new TextWatcher() {
@Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
//no need
}
@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
//no need
}
@Override
public void afterTextChanged(Editable s) {
String ean = s.toString();
//catch isbn10 numbers
if (ean.length() == 10 && !ean.startsWith("978")) {
ean = "978" + ean;
}
if (ean.length() < 13) {
clearFields();
return;
}
//Once we have an ISBN, start a book intent
Intent bookIntent = new Intent(getActivity(), BookService.class);
bookIntent.putExtra(BookService.EAN, ean);
bookIntent.setAction(BookService.FETCH_BOOK);
getActivity().startService(bookIntent);
AddBook.this.restartLoader();
}
});
rootView.findViewById(R.id.scan_button).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
IntentIntegrator scanIntegrator = new IntentIntegrator(getActivity());
scanIntegrator.setBeepEnabled(true);
scanIntegrator.setBarcodeImageEnabled(true);
scanIntegrator.setPrompt("Scan a barcode");
scanIntegrator.initiateScan();
}
});
rootView.findViewById(R.id.save_button).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
ean.setText("");
}
});
rootView.findViewById(R.id.delete_button).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Intent bookIntent = new Intent(getActivity(), BookService.class);
bookIntent.putExtra(BookService.EAN, ean.getText().toString());
bookIntent.setAction(BookService.DELETE_BOOK);
getActivity().startService(bookIntent);
ean.setText("");
}
});
if(savedInstanceState!=null){
ean.setText(savedInstanceState.getString(EAN_CONTENT));
ean.setHint("");
}
return rootView;
}
public void onActivityResult(int requestCode, int resultCode, Intent intent) {
//retrieve scan result
IntentResult scanningResult = IntentIntegrator.parseActivityResult(requestCode, resultCode, intent);
if (scanningResult != null) {
//we have a result
String scanContent = scanningResult.getContents();
String scanFormat = scanningResult.getFormatName();
formatTxt.setText("FORMAT: " + scanFormat);
contentTxt.setText("CONTENT: " + scanContent);
Log.i("FORMAT ", scanFormat);
Log.i("CONTENT", scanContent);
Log.i("xZing", "contents: "+scanContent+" format: "+scanFormat);
Toast.makeText(getActivity(), "FORMAT " + scanFormat + " CONTENT " + scanContent, Toast.LENGTH_LONG).show();
}else{
Toast toast = Toast.makeText(getActivity(),
"No scan data received!", Toast.LENGTH_SHORT);
toast.show();
}
}
// Checks for network connection
public boolean checkNetworkConnection(){
ConnectivityManager cm =
(ConnectivityManager)getActivity().getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo activeNetwork = cm.getActiveNetworkInfo();
boolean isConnected = activeNetwork != null &&
activeNetwork.isConnectedOrConnecting();
return isConnected;
}
private void restartLoader(){
getLoaderManager().restartLoader(LOADER_ID, null, this);
}
@Override
public android.support.v4.content.Loader<Cursor> onCreateLoader(int id, Bundle args) {
if(ean.getText().length()==0){
return null;
}
String eanStr= ean.getText().toString();
if(eanStr.length()==10 && !eanStr.startsWith("978")){
eanStr="978"+eanStr;
}
return new CursorLoader(
getActivity(),
AlexandriaContract.BookEntry.buildFullBookUri(Long.parseLong(eanStr)),
null,
null,
null,
null
);
}
@Override
public void onLoadFinished(android.support.v4.content.Loader<Cursor> loader, Cursor data) {
if (!data.moveToFirst()) {
return;
}
String bookTitle = data.getString(data.getColumnIndex(AlexandriaContract.BookEntry.TITLE));
((TextView) rootView.findViewById(R.id.bookTitle)).setText(bookTitle);
String bookSubTitle = data.getString(data.getColumnIndex(AlexandriaContract.BookEntry.SUBTITLE));
((TextView) rootView.findViewById(R.id.bookSubTitle)).setText(bookSubTitle);
String authors = data.getString(data.getColumnIndex(AlexandriaContract.AuthorEntry.AUTHOR));
String[] authorsArr = authors.split(",");
((TextView) rootView.findViewById(R.id.authors)).setLines(authorsArr.length);
((TextView) rootView.findViewById(R.id.authors)).setText(authors.replace(",","\n"));
String imgUrl = data.getString(data.getColumnIndex(AlexandriaContract.BookEntry.IMAGE_URL));
if(Patterns.WEB_URL.matcher(imgUrl).matches()){
new DownloadImage((ImageView) rootView.findViewById(R.id.bookCover)).execute(imgUrl);
rootView.findViewById(R.id.bookCover).setVisibility(View.VISIBLE);
}
String categories = data.getString(data.getColumnIndex(AlexandriaContract.CategoryEntry.CATEGORY));
((TextView) rootView.findViewById(R.id.categories)).setText(categories);
rootView.findViewById(R.id.save_button).setVisibility(View.VISIBLE);
rootView.findViewById(R.id.delete_button).setVisibility(View.VISIBLE);
}
@Override
public void onLoaderReset(android.support.v4.content.Loader<Cursor> loader) {
}
private void clearFields(){
((TextView) rootView.findViewById(R.id.bookTitle)).setText("");
((TextView) rootView.findViewById(R.id.bookSubTitle)).setText("");
((TextView) rootView.findViewById(R.id.authors)).setText("");
((TextView) rootView.findViewById(R.id.categories)).setText("");
rootView.findViewById(R.id.bookCover).setVisibility(View.INVISIBLE);
rootView.findViewById(R.id.save_button).setVisibility(View.INVISIBLE);
rootView.findViewById(R.id.delete_button).setVisibility(View.INVISIBLE);
}
@Override
public void onAttach(Activity activity) {
super.onAttach(activity);
activity.setTitle(R.string.scan);
}
}
enter code here
答案 0 :(得分：1)
问题在于我使用的是IntentIntegrator scanIntegrator = new IntentIntegrator（getActivity（）），它会在onActivityResult上调用Activity / Parent级别。由于onActivityResult没有做任何事情，所以什么也没发生。因为我正在使用片段，所以没有调用子/片段的onActivityResult。
要修复它，我将onClick中的IntentIntegrator scanIntegrator = new IntentIntegrator（getActivity（））替换为IntentIntegrator.forSupportFragment（AddBook.this），并在片段中引用“AddBook.this”，以便调用片段中的onActivityResult，而不是活动中的一个。
：）
干杯！