私はバーコードをスキャンして結果を表示するこのアプリケーションを行っています。現在、TexView
はバーコードをスキャンした後に何も表示されません。TextViewが表示されない結果
ここMainActivity.java
public class MainActivity extends AppCompatActivity {
private Toolbar toolbar;
private TabLayout tabLayout;
private ViewPager viewPager;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_scrollable_tabs);
toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
viewPager = (ViewPager) findViewById(R.id.viewpager);
setupViewPager(viewPager);
tabLayout = (TabLayout) findViewById(R.id.tabs);
tabLayout.setupWithViewPager(viewPager);
}
private void setupViewPager(ViewPager viewPager) {
ViewPagerAdapter adapter = new ViewPagerAdapter(getSupportFragmentManager());
adapter.addFrag(new OneFragment(), "ONE");
adapter.addFrag(new TwoFragment(), "TWO");
adapter.addFrag(new ThreeFragment(), "THREE");
adapter.addFrag(new FourFragment(), "FOUR");
adapter.addFrag(new FiveFragment(), "FIVE");
adapter.addFrag(new SixFragment(), "SIX");
adapter.addFrag(new SevenFragment(), "SEVEN");
adapter.addFrag(new EightFragment(), "EIGHT");
adapter.addFrag(new NineFragment(), "NINE");
adapter.addFrag(new TenFragment(), "TEN");
viewPager.setAdapter(adapter);
}
class ViewPagerAdapter extends FragmentPagerAdapter {
private final List<Fragment> mFragmentList = new ArrayList<>();
private final List<String> mFragmentTitleList = new ArrayList<>();
public ViewPagerAdapter(FragmentManager manager) {
super(manager);
}
@Override
public Fragment getItem(int position) {
return mFragmentList.get(position);
}
@Override
public int getCount() {
return mFragmentList.size();
}
public void addFrag(Fragment fragment, String title) {
mFragmentList.add(fragment);
mFragmentTitleList.add(title);
}
@Override
public CharSequence getPageTitle(int position) {
return mFragmentTitleList.get(position);
}
}
}
だ。ここスキャナコード
public class OneFragment extends Fragment{
public OneFragment() {
// Required empty public constructor
}
Button scan_btn;
TextView barcode;
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_one, container, false);
scan_btn = (Button) view.findViewById(R.id.scan_button);
//initialize the textViews
barcode = (TextView)view.findViewById(R.id.barcodeResult);
final Activity activity = getActivity();
scan_btn.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
IntentIntegrator integrator = new IntentIntegrator(activity);
integrator.setDesiredBarcodeFormats(IntentIntegrator.PRODUCT_CODE_TYPES);
integrator.setPrompt("Scan");
integrator.setCameraId(0);
integrator.setBeepEnabled(false);
integrator.setBarcodeImageEnabled(true);
integrator.initiateScan();
}
});
return view;
}
public void onActivityResult(int requestCode, int resultCode, Intent data) {
IntentResult result = IntentIntegrator.parseActivityResult(requestCode, resultCode, data);
if (result != null) {
barcode.setText(result.getContents());
}else {
Toast toast = Toast.makeText(getContext(),"No scan data received!", Toast.LENGTH_SHORT);
toast.show();
}
}
}
とXMLファイル
<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" >
<Button android:id="@+id/scan_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:text="scan" />
<TextView
android:id="@+id/barcodeResult"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceLarge"
android:text="Start scanning by pressing the FAB!"
android:layout_centerHorizontal="true" />
</RelativeLayout>
textViewの表示は何ですか?エラーになりますか? –
多分、活動結果が断片ではなく活動にあるべきであろうか? –
アクティビティまたはフラグメントは何も意味を持たない関数は両方ともで動作する必要があります –