所以,在最新更新之前,我使用 onListItemClick 监听器,它工作正常,但现在我尝试使用 RecyclerView,我不确定如何为每个项目实现 onClick,这将打开一个新活动..
这是我曾经拥有的
public class SermonsFragment extends Fragment {
@Override
public void onListItemClick(ListView list, View v, int position, long id) {
Intent mediaStreamIntent = new Intent(getActivity(), MediaStreamPlayer.class);
mediaStreamIntent.putExtra("sermon_details", (android.os.Parcelable) list.getItemAtPosition(position));
startActivity(mediaStreamIntent);
}
}
但是现在,我没有使用 listview,而是创建了一个讲道适配器,它看起来像这样
public class SermonListAdapter extends RecyclerView.Adapter<SermonListAdapter.ViewHolder>{
private ArrayList<Sermon> mDataset;
// Provide a reference to the views for each data item
// Complex data items may need more than one view per item, and
// you provide access to all the views for a data item in a view holder
//Note: need to remove static class no idea why
public class ViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener{
// each data item is just a string in this case
public View mView;
public ViewHolder(View v) {
super(v);
v.setOnClickListener(this);
mView = v;
}
@Override
public void onClick(View v) {
Log.d("SermonsListAdapter.java.debug", "itemClick " + mDataset.get(getPosition()).getName());
}
}
// Provide a suitable constructor (depends on the kind of dataset)
public SermonListAdapter(ArrayList<Sermon> myDataset) {
mDataset = myDataset;
}
// Create new views (invoked by the layout manager)
@Override
public SermonListAdapter.ViewHolder onCreateViewHolder(ViewGroup parent,
int viewType) {
// create a new view
View v = LayoutInflater.from(parent.getContext())
.inflate(R.layout.sermon_cardview, parent, false);
// set the view's size, margins, paddings and layout parameters
ViewHolder vh = new ViewHolder(v);
return vh;
}
// Replace the contents of a view (invoked by the layout manager)
@Override
public void onBindViewHolder(ViewHolder holder, int position) {
// - get element from your dataset at this position
// - replace the contents of the view with that element
TextView title = (TextView) holder.mView.findViewById(R.id.sermon_title);
TextView series = (TextView) holder.mView.findViewById(R.id.sermon_series);
TextView pastor = (TextView) holder.mView.findViewById(R.id.sermon_pastor);
TextView sermonDate = (TextView) holder.mView.findViewById(R.id.sermon_date);
title.setText(mDataset.get(position).getName());
series.setText(mDataset.get(position).getSeries());
pastor.setText(mDataset.get(position).getPastor());
sermonDate.setText(mDataset.get(position).getSermonDate());
}
并且片段或多或少相同,只是我不能再使用 onListItemClick
public class SermonsFragment extends Fragment {
private static final int MAX_SERMONS_LIST = 20;
private ArrayAdapter<Sermon> listAdapter;
private String imageUrl;
private static String sermonListJSONUrl = “http://someurl”;
private RecyclerView mRecyclerView;
private RecyclerView.Adapter mAdapter;
private RecyclerView.LayoutManager mLayoutManager;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setRetainInstance(true);
//Check if there is internet, if yes call JSONParser
ConnectionDetector myConnection = new ConnectionDetector(getActivity().getApplicationContext());
Boolean isInternetOnline = false;
isInternetOnline = myConnection.isConnectingToInternet();
if(isInternetOnline) {
//Call JSONParser Asynchronously to get sermonList in JSON Format
new callJSONParserAsync().execute(sermonListJSONUrl);
}
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_sermons, container, false);
mRecyclerView = (RecyclerView) rootView.findViewById(R.id.my_recycler_view);
return rootView;
}
@Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
mLayoutManager = new LinearLayoutManager(getActivity());
mRecyclerView.setLayoutManager(mLayoutManager);
mRecyclerView.setItemAnimator(new DefaultItemAnimator());
//Just an Empty Class
ArrayList<Sermon> mySermon = new ArrayList<Sermon>();
//specify an adapter
mAdapter = new SermonListAdapter(mySermon);
mRecyclerView.setAdapter(mAdapter);
}
我的cardview xml看起来像这样
<!-- A CardView that contains a TextView -->
<android.support.v7.widget.CardView
xmlns:card_view="http://schemas.android.com/apk/res-auto"
android:id="@+id/card_view"
android:layout_margin="5dp"
android:layout_width="match_parent"
android:layout_height="100dp"
card_view:cardCornerRadius="1dp">
<LinearLayout android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceLarge"
android:id="@+id/sermon_title" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceSmall"
android:id="@+id/sermon_series" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceSmall"
android:id="@+id/sermon_pastor" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceSmall"
android:id="@+id/sermon_date" />
</LinearLayout>
</android.support.v7.widget.CardView>
尝试创建新意图时出现此错误
12-18 22:31:48.469 31887-31887/org.ifgfseattle.ifgfseattle E/AndroidRuntime﹕ FATAL EXCEPTION: main
Process: org.ifgfseattle.ifgfseattle, PID: 31887
android.util.AndroidRuntimeException: Calling startActivity() from outside of an Activity context requires the FLAG_ACTIVITY_NEW_TASK flag. Is this really what you want?
at android.app.ContextImpl.startActivity(ContextImpl.java:1232)
at android.app.ContextImpl.startActivity(ContextImpl.java:1219)
at android.content.ContextWrapper.startActivity(ContextWrapper.java:322)
at org.ifgfseattle.ifgfseattle.adapter.SermonListAdapter$1.onClick(SermonListAdapter.java:81)
at android.view.View.performClick(View.java:4756)
at android.view.View$PerformClick.run(View.java:19749)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5221)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)