I'm developing a layout in an Android app that will be used in Tablets, basically the main layout has a Toolbar DrawerLayout , a FrameLayout and a Fragment , as below:
<?xml version="1.0" encoding="utf-8"?>
<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">
<include
android:id="@+id/toolbar"
layout="@layout/default_toolbar" />
<android.support.v4.widget.DrawerLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/drawer_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_below="@id/toolbar">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:baselineAligned="false"
android:orientation="horizontal">
<FrameLayout
android:id="@+id/content_frame"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="0.8" />
<fragment
android:id="@+id/history_frag"
class="br.com.exemplo.HistoryFragment"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="0.2"
tools:layout="@layout/history_fragment" />
</LinearLayout>
<ListView
android:id="@+id/left_drawer"
android:layout_width="240dp"
android:layout_height="match_parent"
android:layout_gravity="start"
android:background="@android:color/background_light"
android:choiceMode="singleChoice"
android:divider="@android:color/transparent"
android:dividerHeight="1dp" />
</android.support.v4.widget.DrawerLayout>
</RelativeLayout>
The content_frame is responsible for accommodating the fragments according to the option selected and the history_frag is a fixed , in> has the layout :
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginBottom="16dp"
android:layout_marginTop="16dp"
android:text="@string/lbl_history"
android:textAppearance="?android:attr/textAppearanceLarge" />
<ScrollView
android:id="@+id/scrollView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="@id/textView1"
android:layout_marginBottom="16dp">
<ListView
android:id="@android:id/list"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:choiceMode="singleChoice" />
</ScrollView>
<Button
android:id="@+id/btnClear"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@id/scrollView"
android:text="@string/lbl_clear" />
</RelativeLayout>
I would like to know how to dynamically add new items in the ListView that stays within history_frag , through the current fragment that is in content_frame . I tried to do this:
// Fragment qualquer que está no content_frame, todos os fragments que serão chamados
// possuem um Button chamado btnRandom.
public class ExemploFragment extends Fragment {
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container,
@Nullable Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.exemplo_fragment, container, false);
Button btnRandom = (Button) v.findViewById(R.id.btnRandom);
btnRandom.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// aqui é adicionado um novo item ao history_frag
HistoryFragment historyFrag = (HistoryFragment) getActivity().
getSupportFragmentManager().findFragmentById(R.id.history_frag);
if (historyFrag != null) {
historyFrag.addHistory("Um item qualquer");
}
}
});
return v;
}
}
The HistoryFrame class looks like this:
public class HistoryFragment extends ListFragment {
private ArrayAdapter<String> mArrayAdapter;
private List<String> mList;
@Override
public void onActivityCreated(@Nullable Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
mList = new ArrayList<String>();
mList.add("a");
mList.add("b");
mList.add("c");
mArrayAdapter = new ArrayAdapter<String>(getActivity(), android.R.layout.simple_list_item_1, mList);
setListAdapter(mArrayAdapter);
}
@Override
public View onCreateView(final LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.history_fragment, container, false);
Button btnClear = (Button) v.findViewById(R.id.btnClear);
btnClear.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
mArrayAdapter.clear();
mArrayAdapter.notifyDataSetChanged();
}
});
return v;
}
public void addHistory(String history) {
if (mArrayAdapter != null) {
mArrayAdapter.add(history);
mArrayAdapter.notifyDataSetChanged();
}
}
}
In this way, only the first item is added to the ListView , I tried to debug the code and the items are passed to the HistoryFragment correctly, they just are not updated. I also tried calling notifyDataSetChanged(); inside runOnUiThread , but it did not work. Does anyone have any idea where I might be going wrong?