I want to create a ListView where each row will have two buttons. Button1 and Button2 .
I read a few tutorials on how to create a CustomAdapter or extend the BaseAdapter , but none of them worked in my case, so I am opening a new question here.
I have a static (non-changing) String Array in my strings.xml :
<string-array name="locations_array"> <item>Item1</item> <item>Item2</item> </string-array>
I want to use this array in my ListView (I manage to create a regular ListView with an onClick event, but now I want to add buttons to each row) and add two buttons to each row, each of which will have its own onClick event.
I followed the steps from here answers and several other guides on the Internet, but I always get a NullPointerException when trying to setText .
CustomAdapter.java
public class CustomAdapter extends BaseAdapter implements ListAdapter { private ArrayList<String> list = new ArrayList<>(); private Context ctx; public CustomAdapter(ArrayList<String> list, Context ctx){ this.list = list; this.ctx = ctx; } @Override public int getCount() { return list.size(); } @Override public Object getItem(int position) { Log.d("TAG", list.get(position)); return list.get(position); } @Override public long getItemId(int position) { return position; } @Override public View getView(int position, View convertView, ViewGroup parent) { View view = convertView; if(view == null){ LayoutInflater inflater = (LayoutInflater) ctx.getSystemService(Context.LAYOUT_INFLATER_SERVICE); view = inflater.inflate(R.layout.layout_listview,null); } Log.d("TAG", list.get(position)); TextView listItemText = (TextView) view.findViewById(R.id.list_item_string); listItemText.setText(list.get(position)); Button localData = (Button) view.findViewById(R.id.button1); Button onlineData = (Button) view.findViewById(R.id.button2); localData.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { } }); onlineData.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { } }); return view; } }
And here I use the adapter in my fragment:
locationsArray = getResources().getStringArray(R.array.locations_array); ArrayList<String> data = new ArrayList<>(Arrays.asList(locationsArray)); CustomAdapter adapter = new CustomAdapter(data,getActivity()); listView.setAdapter(adapter);
But that does not work. All tutorials focus on something else than what I need. I just need to just put two buttons on each line with an existing String Array. I do not want to add anything dynamically, etc. Just use this array of strings that I already created.
EDIT (adding XML files that I forgot!)
R.layout.layout_listview (EditText is for filtering the list):
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="match_parent" android:layout_height="match_parent"> <EditText android:id="@+id/et_filter" android:layout_height="wrap_content" android:layout_width="match_parent" android:hint="Search Location"> </EditText> <ListView android:id="@+id/list" android:layout_height="wrap_content" android:layout_width="match_parent"> </ListView> </LinearLayout>
R.layout.layout_listview_buttons:
<?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="match_parent" android:layout_height="match_parent"> <TextView android:id="@+id/list_item_string" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_centerVertical="true" android:layout_alignParentLeft="true" android:paddingLeft="8dp" android:textSize="18sp" android:textStyle="bold" /> <Button android:id="@+id/button1" android:layout_width="80dp" android:layout_height="40dp" android:layout_alignParentRight="true" android:layout_alignParentTop="true" android:focusable="false" android:focusableInTouchMode="false" android:text="Online Data" android:textColor="#0099CC" /> <Button android:id="@+id/button2" android:layout_width="80dp" android:layout_height="40dp" android:layout_alignParentRight="true" android:layout_below="@+id/button1" android:layout_marginTop="3dp" android:focusable="false" android:focusableInTouchMode="false" android:text="Local Data" android:textColor="#0099CC" /> </RelativeLayout>
LogCat exception:
12-15 11:24:10.852 14626-14626/com.inodroid.myweatherapp E/AndroidRuntime﹕ FATAL EXCEPTION: main Process: com.inodroid.myweatherapp, PID: 14626 java.lang.NullPointerException at com.inodroid.myweatherapp.Data.CustomAdapter.getView(CustomAdapter.java:59)
Line Code:
listItemText.setText(list.get(position));
Hope someone can help me here.
Greetings