0
我有一個活動與ViewPager內兩個可滑動的片段。 我有一個FragmentPagerAdapter的實現，它處理ViewPager中的片段。 問題是，我啓動了片段A中的Intent（zxing條形碼掃描器），它調用父活動的onActivityResult()（而不是片段，我嘗試了很多東西，但它不起作用！）。片段的查看成員null配置更改，內ViewPager
無論如何，通過Activity的onActivityResult()我從ViewPager獲取片段，調用其中的一個方法，它使用掃描器結果更新搜索視圖。該片段是牽強，但我想在破片A到更新搜索查看是空
這裏是我的班，一些地方爲了簡單去除（配置變化，由故意觸發後）：
public class TabsAdapter extends FragmentPagerAdapter {
private final Context mContext;
private final ActionBar mActionBar;
private final ViewPager mViewPager;
private final ArrayList<TabInfo> mTabs = new ArrayList<TabInfo>();
private final String TAG = "21st Polling:";
static final class TabInfo{
private final Class<?> clss;
private final Bundle args;
TabInfo(Class<?> _class, Bundle _args){
clss = _class;
args = _args;
}
}
public TabsAdapter(SherlockFragmentActivity fa, ViewPager pager) {
super(fa.getSupportFragmentManager());
mContext = fa;
mActionBar = fa.getSupportActionBar();
mViewPager = pager;
mViewPager.setAdapter(this);
mViewPager.setOffscreenPageLimit(3);
mViewPager.setOnPageChangeListener(this);
}
public void addTab(ActionBar.Tab tab, Class<?> clss, Bundle args){
TabInfo info = new TabInfo(clss, args);
tab.setTag(info);
tab.setTabListener(this);
mTabs.add(info);
mActionBar.addTab(tab);
notifyDataSetChanged();
}
@Override
public void onPageSelected(int position) {
mActionBar.setSelectedNavigationItem(position);
}
@Override
public void onTabSelected(Tab tab, FragmentTransaction ft) {
mViewPager.setCurrentItem(tab.getPosition());
Log.v(TAG, "clicked");
Object tag = tab.getTag();
for (int i = 0; i<mTabs.size(); i++){
if (mTabs.get(i) == tag){
mViewPager.setCurrentItem(i);
}
}
}
}
Acivity這主機片段：
public class OrderActivity extends SherlockFragmentActivity implements
OrderData {
private ViewPager mViewPager;
private TabsAdapter mTabsAdapter;
private Tab cartTab;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_INDETERMINATE_PROGRESS);
mViewPager = new ViewPager(this);
mViewPager.setId(R.id.pager);
setContentView(mViewPager);
final ActionBar bar = getSupportActionBar();
bar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
mTabsAdapter = new TabsAdapter(this, mViewPager);
mTabsAdapter.addTab(bar.newTab().setText("A"),
A.class, null);
mTabsAdapter.addTab(bar.newTab().setText("B(0)"),
B.class, null);
}
public void onActivityResult(int requestCode, int resultCode, Intent intent) {
IntentResult scanResult = IntentIntegrator.parseActivityResult(
requestCode, resultCode, intent);
//calling method productScaned() in fragment A here
if (scanResult != null) {
((A)mTabsAdapter.getItem(0)).productScaned(intent.getStringExtra("SCAN_RESULT"));
}
}
}
片段A：
public class A extends SherlockFragment {
private SearchView svMProducts;
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_a, container,
false);
svMProducts = (SearchView) view.findViewById(R.id.svMProductsInvoice);
svMProducts.setOnQueryTextListener(queryListener);
svMProducts.requestFocus();
btnScanBarcode = (ImageView)view.findViewById(R.id.btnScanBarcode);
btnScanBarcode.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
//tried with IntentIntegrator also, didn't work
IntentIntegratorSupportV4 integrator = new IntentIntegratorSupportV4(A.this);
integrator.initiateScan();
}
});
return view;
}
public void productScaned(String upc){
//this method gets called but svMProducts view is null!
svMProducts.setQuery(upc, true);
}
}