Development issue/problem:

Attempts to create an ExpandableListView. The original view with the groups is displayed perfectly. However, when I click on an item in the list, my arrow does not change. See pictures below.

How can I change the direction of the arrow?

XML format :

settings_selector.xml :

How can I solve this problem?

Solution 1:

expandable list

set indicator here I use the set indicator code like this, it works fine.

DisplayMetrics metrics = new DisplayMetrics() ;
getWindowManager().getDefaultDisplay().getMetrics(Metrics) ;
int width = metrics.widthPixels ;

mExpandableList = (ExpandableListView)findViewById(R.id.expandable_list);
mExpandableList.setIndicatorBounds(width – GetPixelFromDips(50), width – GetPixelFromDips(10))

audience int GetPixelFromDips(floatpixel) {
// get screen density scale
final float scale = getResources().getDisplayMetrics().density ;
// convert dps to pixels using return density scale
(int) (pixel * scale + 0.5f) ;
}

rewritable/signable/group indicator

Solution 2:

Try this for your settings_selector.xml :

Solution 3:

I got my way: Use the isExpanded flag to decide if your groupView left/right should be drawn.
This makes it easier for us to adjust the backfill / bottom and other elements that can be drawn on the indicator.

I hope this helps.

public view getGroupView(int groupPosition, boolean isExpanded, View convertView,
ViewGroup parent) {
TextView textView = (TextView) mLayoutInflater.inflate(R.layout.menu_group, null);
textView.setCompoundDrawablesWithIntrinsicBounds(0, 0, is Expanded? 0: android.R.drawable.ic_menu_more, 0);
textView.setText(getGroupPosition).toString());
returns textView;
}.

Solution 4:

Import java.util.ArrayList ;

Import android.app.Activity;
import android.content.Context;
import android.database.DataSetObserver;
import android.os.bundle;
import android.view.LayoutInflater;
import android.view.Display; import
android.view.OnClickListView;
import android.view.ViewGroup;
import android.widget.BaseExpandableListAdapter;
import android.widget.ExpandableListView;
import android.widget.TextView ;

public class MyActivity expands the activity {

Expandable private listExtendable international list ;

@Override
public void onCreate(Bundle storedInstanceState) {
super.onCreate(storedInstanceState) ;
setContentView(R.layout.activity_my) ;

mExpandableList = (ExpandableListView)findViewById(R.id.expandable_list);
mExpandableList.setGroupIndicator(null);
ArrayList arrayParents = new ArrayList();
ArrayList arrayChildren = new ArrayList() ;

// where we have the parents and children
for (int i = 0; i ( );
for (int j = 0; j mArrayChildren ;

public String getTitle() {
gives mTitle;
}

public invalid setTitle(String mTitle) {
this.mTitle = mTitle;
}

public ArrayList getArrayChildren() {
return mArrayChildren;
}

public invalid setArrayChildren(ArrayList mArrayChildren) {
this.mArrayChildren = mArrayChildren;
}
}

The MyCustomAdapter public class expands the BaseExpandableListAdapter by OnClickListener{

personal modelInflatable air inlet;
personal Massive mReader ;

public MyCustomAdapter(context, ArrayList older){
mParent = older;
inflater = LayoutInflater.from(context);
}

@Check
//counts the number of elements in the group/older so the list knows how many times the method
public int getGroupCount() is called {
gives mParent.size();
}.

@Override
//c counts the number of children so the list knows how often the
getChildView() audience int getChildrenCount(int i) {
gives mParent.get(i).getArrayChildren().size();
}.

@ upperriede
// set the title of each parent/group
public object getGroup(int i) {
gives mParent.get(i).getTitle();
}

@Overview
// set the name of each
public element Object getChild(int i, int i1) {
returns mParent.get(i).getArrayChildren().get(i1);
}

@Override
public long getGroupId(int i) {
return i;
}

@Override
public long getChildId(int i, int i1) {
return i1;
}

@Override
public boolean hasStableIds() {
returns where;
}

@View
// This method requires you to set the text to get the parent/group in the
public View list getGroupView (int i, boolean b, View view, ViewGroup viewGroup) {

if (view == null) {
view = inflater.inflate(R.layout.list_item_parent, viewGroup,false);
}
view.findViewById(R.id.button).setTag(i);
view.findViewById(R.id.button).setOnClickListener(this);
TextView textView = (TextView) view.findViewById(R.id.list_item_text_view);
//i – position of parent/group in list
textView.setText(getGroup(i).toString()) ;

// return the entire image
;
}

@Overview
//In this method you must set the text so that children in the
public view getChildView(int i, int i1, boolean b, viewGroup viewGroup) {
as (view == null) {
view = inflater.inflate(R.layout.list_item_child, viewGroup,false);
}

TextView textView = (TextView) view.findViewById(R.id.list_item_text_child);
//i – position of parent/group in the list and
//i1 – child
textView.setText(mParent.get(i).getArrayChildren().get(i1))

// return the entire image
;
}

@Override
public boolean isChildSelectable(int i, int i1) {
returns where;
}

@Override
public invalid registryDataSetObserver(DataSetObserver Observer) {
/* used to run the notifyDataSetChanged() method */
super.registryDataSetObserver(Observer);
}.

/* (not Javadoc)
* @See android.view.OnClickListener#onClick(android.view.View)
* @since 20 Mar 2013
* @author rajeshcp
*/
@Override
public void onClick(View v) {
if(mExpandableList.isGroupExpanded((Integer)v.getTag())))
{
mExpandableList.collapseGroup((Integer)v.getTag())));
}else
{
mExpandableList.expandGroup((Integer)v.getTag());
}
}
}.

}

Change your MyActivity this way and let me know what else you want?

Solution No 5:

Subject:

int width = getResources().getDisplayMetrics().widthPixels;
if (android.os.Build.VERSION.SDK_INT)

and an auxiliary method:

public static int getPixelValue(int dp) {

final floating scale = getResources().getDisplayMetrics().density;
return (int) (dp * scale + 0,5f);
}.

Solution No 6:

Just create a representation of the images wherever you want in the xml example of the group element :

And then for your ExpandableListView, use GroupClickListener to programmatically change the image to ImageView, such as :

listView.setOnGroupClickListListener(new ExpandableListView.OnGroupClickListener() {
@Override
public boolean onGroupClick(ExpandableListView parent, View v, int groupPosition, long id) {
parent.smoothScrollToPosition(groupPosition) ;

if (parent.isGroupExpanded(groupPosition)) {
ImageView imageView = v.findViewById(R.id.expandable_icon)));
imageView.setImageDrawable(getResources().getDrawable(R.drawable).group_icon_not_expanded)));
} else {
imageView imageView = v.findViewById(R.id.expandable_icon))));
imageView.setImageDrawable(getResources().getDrawable(R.drawable.group_icon_expanded)));
}
return false;
}
})

Solution No 7:

I’m a little late at the party, but something’s changed.

Give here a description of the image

I had three demands:

  1. If the group has a child, show the down arrow (V).
  2. if the group has no children, there is no arrow/image
  3. When a group with subordinate elements is extended, an arrow (^) appears.

To achieve such a thing:

  1. Your ExpandableListView looks similar with android:groupIndicator null.

 

  1. The layout of your group/header would look like this, with text and an image at the end:
  2. Use the following method in the getGroupView() of your BaseExpandableListAdapter

if (Objects.requireNonNull(expandableListDetail.get(expandableListTitle.get(listPosition)))).size() > 0) {
if (is Expanded) {
ivIcon.setImageResource(R.drawable.arrow_up);
} otherwise {
ivIcon.setImageResource(R.drawable.arrow_down);
}
}.

Where expableListTitle is the group and expableListDetail are the children.

Good luck!

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