问题
I have been searching for 3 or 4 days about a solution on this. I have tried: Null Pointer exception in using support library share action provider or why MenuItemCompat.getActionProvider returns null? and some others but still I get null on ShareActionProvider. I am pretty new on developing android apps so I really need some help.
My xml menu file is:
<menu xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto">
<item
android:id="@+id/action_share"
android:title="@string/action_share"
app:showAsAction="always"
android:icon="@android:drawable/ic_menu_share"
android:actionProviderClass="android.support.v7.widget.ShareActionProvider"/></menu>
and my fragment is:
public static class DailyActivityFragment extends Fragment {
private static final String LOG_TAG = "Dailyshare";
private ShareActionProvider mShareActionProvider;
public DailyActivityFragment() {
setHasOptionsMenu(true);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_detail, container, false);
return rootView;
}
public void onCreateOptionsMenu(Menu menu, MenuInflater inflater){
inflater.inflate(R.menu.detailfragment, menu);
MenuItem item = menu.findItem(R.id.action_share);
mShareActionProvider = (ShareActionProvider) MenuItemCompat.getActionProvider(item);
if (mShareActionProvider != null) {
mShareActionProvider.setShareIntent(createShareIntent());
}else{
Log.i(LOG_TAG, "is null");
}
}
private Intent createShareIntent() {
Intent shareIntent = new Intent(Intent.ACTION_SEND);
shareIntent.setType("text/plain");
shareIntent.putExtra(Intent.EXTRA_TEXT,
"this text will be shared");
return shareIntent;
}
}
as an import I have:
import android.support.v7.widget.ShareActionProvider;
回答1:
You could just create a ShareActionProvider and assign it.
mShareActionProvider = new ShareActionProvider();
mShareActionProvider.setShareIntent(createShareIntent())
MenuItemCompat.setActionProvider(item, mShareActionProvider);
回答2:
You have wrong namespace usage in XML:
<menu xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto">
<item android:actionProviderClass="android.support.v7.widget.ShareActionProvider"
should be app:actionProviderClass (the provider class is from apk resources, not native android classes).
See https://stackoverflow.com/a/32602896/907576
来源:https://stackoverflow.com/questions/25093706/shareactionprovider-is-null