Expandable list view move group icon indicator to right

问题

As regards to expandable list view, the group icon indicator is positioned to the left side, can I move the indicator and positioned it to the right? Thanks.

EDITED: Since I don't want to extend the view, I got this workaround of getting the width dynamically. Just sharing my solution.

Display newDisplay = getWindowManager().getDefaultDisplay(); 
int width = newDisplay.getWidth();
newListView.setIndicatorBounds(width-50, width);

回答1:

According to ExpandableListView's source code, the only way to move an indicator to the right side is to change its bounds using ExpandableListView.setIndicatorBounds() method. You can calculate bound in onSizeChanged() method, for example.

回答2:

setIndicatorBounds(int, int) does not work properly for Android 4.3. They introduced a new method setIndicatorBoundsRelative(int, int) which works ok for 4.3.

@Override
public void onWindowFocusChanged(boolean hasFocus) {
    super.onWindowFocusChanged(hasFocus);
    if(android.os.Build.VERSION.SDK_INT < android.os.Build.VERSION_CODES.JELLY_BEAN_MR2) {
       mExpandableListView.setIndicatorBounds(myLeft, myRight);
    } else {
       mExpandableListView.setIndicatorBoundsRelative(myLeft, myRight);
    }
}

回答3:

The best way to do this is below but not for all Android Version So use 2nd or third method specified below

ViewTreeObserver vto = mExpandableListView.getViewTreeObserver();

    vto.addOnGlobalLayoutListener(new OnGlobalLayoutListener() {
        @Override
        public void onGlobalLayout() {
                 mExpandableListView.setIndicatorBounds(mExpandableListView.getRight()- 40, mExpandableListView.getWidth());
        }
    });

or this:

@Override
public void onWindowFocusChanged(boolean hasFocus) {
    super.onWindowFocusChanged(hasFocus);
    mExpandableListView.setIndicatorBounds(mExpandableListView.getRight()- 40, mExpandableListView.getWidth());
} 

will move that indicator to right of list view even on device and on tab also.

or you can do this in a postdelayed thread.

 (new Handler()).post(new Runnable() {

        @Override
        public void run() {
              mExpandableListView.setIndicatorBounds(mExpandableListView.getRight()- 40, mExpandableListView.getWidth());
        }
    });

回答4:

All XML solution! I found a better way of tackling this issue. This does not require you to mess with display metrics, no need to programmatically hack it.

This is what you need to do:

1) set layout direction to right-to-left

<ExpandableListView
...
android:layoutDirection="rtl" />

2) make sure your list item layout includes this (yes, you'll need custom layout):

android:gravity="left" //to adjust the text to align to the left again
android:layoutDirection="ltr"  //OR this line, based on your layout

And you are good to go!

回答5:

I have tried to using setIndicatorBounds and setIndicatorBoundsRelative but the icon not showing as nice as expected. So I change my code as per below :

create a group 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="48dp"
    android:background="@drawable/header_selector" >

    <ImageView
        android:id="@+id/icon"
        android:layout_width="25dp"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_centerVertical="true"
        android:layout_marginLeft="12dp"
        android:layout_marginRight="12dp"
        android:contentDescription="@string/desc_list_item_icon"
        android:src="@drawable/ic_home" />

    <TextView
        android:id="@+id/title"
        android:layout_width="wrap_content"
        android:layout_height="match_parent"
        android:layout_toRightOf="@id/icon"
        android:gravity="center_vertical"
        android:minHeight="?android:attr/listPreferredItemHeightSmall"
        android:paddingRight="40dp"
        android:textAppearance="?android:attr/textAppearanceListItemSmall"
        android:textColor="@color/list_item_title" />

    <TextView
        android:id="@+id/counter"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerVertical="true"
        android:layout_marginRight="8dp"
        android:background="@drawable/counter_bg"
        android:textColor="@color/counter_text_color" />

    <ImageView
        android:id="@+id/icon_expand"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerVertical="true"
        android:layout_marginLeft="200dp"
        android:layout_toRightOf="@+id/counter"
        android:contentDescription="@string/desc_list_item_icon"
        android:src="@drawable/navigation_expand"
        android:visibility="visible" />

    <ImageView
        android:id="@+id/icon_collapse"
        android:layout_width="25dp"
        android:layout_height="wrap_content"
        android:layout_centerVertical="true"
        android:layout_marginLeft="200dp"
        android:layout_toRightOf="@+id/counter"
        android:contentDescription="@string/desc_list_item_icon"
        android:src="@drawable/navigation_collapse"
        android:visibility="gone" /> 

</RelativeLayout>

and using this layout in adapter class inside getGroupView method :

 @Override
    public View getGroupView(int groupPosition, boolean isExpanded,
            View convertView, ViewGroup parent) {

        NavDrawerItem itemHeader = (NavDrawerItem) getGroup(groupPosition);

        LayoutInflater inflater = (LayoutInflater) this.context
                .getSystemService(Context.LAYOUT_INFLATER_SERVICE);

        View view = null;
        if (convertView == null) {
            view = (View) inflater.inflate(R.layout.drawer_header_item, null);
        } else {
            view = convertView;
        }

        ImageView icon = (ImageView) view.findViewById(R.id.icon);

        if (itemHeader.isIconVisible()) {
            icon.setImageResource(itemHeader.getIcon());
        } else {
            icon.setVisibility(View.GONE);
        }

        TextView textTitle = (TextView) view.findViewById(R.id.title);
        textTitle.setText(" " + itemHeader.getTitle());

        TextView textCount = (TextView) view.findViewById(R.id.counter);

        if (itemHeader.getCounterVisibility()) {
            textCount.setText(itemHeader.getCount());
        } else {
            textCount.setVisibility(View.GONE);
        }

        ImageView iconExpand = (ImageView) view.findViewById(R.id.icon_expand);
        ImageView iconCollapse = (ImageView) view
                .findViewById(R.id.icon_collapse);

        if (isExpanded) {
            iconExpand.setVisibility(View.GONE);
            iconCollapse.setVisibility(View.VISIBLE);
        } else {
            iconExpand.setVisibility(View.VISIBLE);
            iconCollapse.setVisibility(View.GONE);
        }

        if (getChildrenCount(groupPosition) == 0) {
            iconExpand.setVisibility(View.GONE);
            iconCollapse.setVisibility(View.GONE);
        }

        return view;
    }

With this method you can adjust the position of the expand/collapse icon properly. hope it helps.

回答6:

Expandable list view move group icon indicator to right

The setIndicatorBounds(int left, int right) is used to set the indicator bounds for the group view of an expandable list view.

explvList.setIndicatorBounds(width-GetDipsFromPixel(35), width-GetDipsFromPixel(5));
Here width means device width.

/Convert pixel to dip 
public int GetDipsFromPixel(float pixels)
{
        // Get the screen's density scale
        final float scale = getResources().getDisplayMetrics().density;
        // Convert the dps to pixels, based on density scale
        return (int) (pixels * scale + 0.5f);
} 

FYI: The width is equal to width specified in the setBounds method. Here in my snippet it is 35.Other wise the icon is disturbed. For more details you may visit here:

• https://developer.android.com/reference/android/widget/ExpandableListView.html#setIndicatorBounds(int,%20int)

• https://developer.android.com/reference/android/widget/ExpandableListView.html#setIndicatorBoundsRelative(int,%20int)

回答7:

Write this code in Expandable Base adapter.

@Override
public View getGroupView(int groupPosition, boolean isExpanded,
                         View convertView, ViewGroup parent) {
    ImageView imgs;

    String headerTitle = (String) getGroup(groupPosition);
    if (convertView == null) {
        LayoutInflater infalInflater = (LayoutInflater) this._context
                .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        convertView = infalInflater.inflate(R.layout.list_group, null);
    }

    TextView lblListHeader = (TextView) convertView
            .findViewById(R.id.lblListHeader);
     imgs = (ImageView) convertView
            .findViewById(R.id.img_list);
    lblListHeader.setTypeface(null, Typeface.BOLD);
    lblListHeader.setText(headerTitle);
    if (isExpanded) {
  imgs.setImageResource(R.drawable.up_arrow);
    }
    else {
        imgs.setImageResource(R.drawable.downs_arrow);
    }

    return convertView;
}

• List item

回答8:

FIX: 

They introduced a new method in the API 18 and onwards, a method called setIndicatorBoundsRelative(int, int). You should check for Android version and use the respective methods with the API's:

expListView = (ExpandableListView) v.findViewById(R.id.laptop_list);

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

if(android.os.Build.VERSION.SDK_INT < android.os.Build.VERSION_CODES.JELLY_BEAN_MR2) {
    expListView.setIndicatorBounds(width - GetDipsFromPixel(50), width - GetDipsFromPixel(10));

} else {
    expListView.setIndicatorBoundsRelative(width - GetDipsFromPixel(50), width - GetDipsFromPixel(10));

}

回答9:

if it is in Fragment - onViewCreated()

    ViewTreeObserver vto = Expnlist.getViewTreeObserver();
    vto.addOnGlobalLayoutListener(new      ViewTreeObserver.OnGlobalLayoutListener() {
        @Override
        public void onGlobalLayout() {
            Expnlist.setIndicatorBounds(Expnlist.getMeasuredWidth() - 80, Expnlist.getMeasuredWidth());
        }
    });

its works for me!. Cheers!

回答10:

The setIndicatorBounds(int left, int right) is used to set the indicator bounds for the group view of an ExpandableListView.

explvList.setIndicatorBounds(width-GetDipsFromPixel(35), width-GetDipsFromPixel(5));

Here width means device width.

Convert pixel to dip :

public int GetDipsFromPixel(float pixels){
    // Get the screen's density scale
    final float scale = getResources().getDisplayMetrics().density;
    // Convert the dps to pixels, based on density scale
    return (int) (pixels * scale + 0.5f);
} 

回答11:

I'm using the following short piece inspired by this sample that requires two drawables on the folder:

if (isExpanded) {
    ListHeader.setCompoundDrawablesWithIntrinsicBounds(0, 0, R.drawable.up, 0);
} else {
    ListHeader.setCompoundDrawablesWithIntrinsicBounds(0, 0, R.drawable.down, 0);
} 

Anyway, I had to adopt goodKode's solution as well "to get rid off" the default arrows.

So, I'd advise to stick with the simple solution previously provided as it's the most minimalist and precise approach.

回答12:

     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));  

   public int GetPixelFromDips(float pixels) {
    // Get the screen's density scale 
    final float scale = getResources().getDisplayMetrics().density;
    // Convert the dps to pixels, based on density scale
    return (int) (pixels * scale + 0.5f);
}

this one worked for me

回答13:

First set android:groupIndicator="@null" in you Expandable listview as below:

then in your header layout as below:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:paddingLeft="@dimen/screen_margin"
    android:paddingRight="@dimen/screen_margin"
    android:paddingTop="@dimen/dot_margin"
    android:paddingBottom="@dimen/dot_margin"
    android:orientation="vertical">




    <TextView
        android:id="@+id/tvQuestion"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="what is jodi?"
        android:textColor="@color/textColor"
        android:textSize="@dimen/font_large"
        app:customFont="@string/font_toolbar"
        android:layout_toLeftOf="@+id/imgDropDown"
        android:layout_marginRight="@dimen/margin"
       />


    <ImageView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/imgDropDown"
        android:layout_alignParentRight="true"
        android:layout_centerVertical="true"
        android:src="@drawable/right_arrow"/>

</RelativeLayout>

Lastly add this in you adapter in getGroupView method add below :

TextView lblListHeader = (TextView) convertView.findViewById(R.id.tvQuestion);

lblListHeader.setText(headerTitle);

ImageView img=convertView.findViewById(R.id.imgDropDown);

if (isExpanded) {
  img.setImageResource(R.drawable.down_arrow);
    lblListHeader.setTextColor(_context.getResources().getColor(R.color.colorPrimary));
} else {
 img.setImageResource(R.drawable.right_arrow);
    lblListHeader.setTextColor(_context.getResources().getColor(R.color.textColor));
}

回答14:

i know it's too late but here is a solution to put the indicator on the right programmatically, simple and easy to use :

expandableListView = (ExpandableListView) findViewById(R.id.expandableListView);

        Display display = getWindowManager().getDefaultDisplay();
        Point size = new Point();
        display.getSize(size);
        int width = size.x;
        Resources r = getResources();
        int px = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP,
                50, r.getDisplayMetrics());
        if (android.os.Build.VERSION.SDK_INT < android.os.Build.VERSION_CODES.JELLY_BEAN_MR2) {
            expandableListView.setIndicatorBounds(width - px, width);
        } else {
            expandableListView.setIndicatorBoundsRelative(width - px, width);
        }

where expandableListView is your ExpandableListview

回答15:

Try this... this code for adjusting the ExpandableList group indicator into right side of the view.

private ExpandableListView expandableListView;
DisplayMetrics metrics;
int width;
metrics = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(metrics);
width = metrics.widthPixels;
expandableListView = (ExpandableListView) findViewById(R.id.expandableListView1);
expandableListView.setIndicatorBounds(width - GetDipsFromPixel(50), width - GetDipsFromPixel(10));

And call this method,

public int GetDipsFromPixel(float pixels)
{
 // Get the screen's density scale
 final float scale = getResources().getDisplayMetrics().density;
 // Convert the dps to pixels, based on density scale
 return (int) (pixels * scale + 0.5f);
}

The result is..

来源：https://stackoverflow.com/questions/5800426/expandable-list-view-move-group-icon-indicator-to-right