Question

我想设置默认情况下左侧显示的指示器图标，应显示在右侧。我曾尝试过在谷歌上找到的所有技术，但似乎我的expandablelistview有些问题或者有其他方法可以做到这一点，我试过了： explistobj.setInicatorBounds（...）不起作用:( 在xml中添加属性机器人：indicatorLeft =＆＃34; 250dp＆＃34; 机器人：indicatorRight =＆＃34; 300dp＆＃34;不起作用：（

代码：

    public class MainActivity extends Activity {

        ExpandableListAdapter listAdapter;
        ExpandableListView expListView;
        List<String> listDataHeader;
        HashMap<String, List<String>> listDataChild;

        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);

            // get the listview
            expListView = (ExpandableListView) findViewById(R.id.lvExp);

            // preparing list data
            prepareListData();
            setDimens();

            listAdapter = new ExpandableListAdapter(this, listDataHeader, listDataChild);

            // setting list adapter
            expListView.setAdapter(listAdapter);

            // Listview Group click listener
            expListView.setOnGroupClickListener(new OnGroupClickListener() {

                @Override
                public boolean onGroupClick(ExpandableListView parent, View v,
                        int groupPosition, long id) {
                    // Toast.makeText(getApplicationContext(),
                    // "Group Clicked " + listDataHeader.get(groupPosition),
                    // Toast.LENGTH_SHORT).show();
                    return false;
                }
            });

            // Listview Group expanded listener
            expListView.setOnGroupExpandListener(new OnGroupExpandListener() {

                @Override
                public void onGroupExpand(int groupPosition) {
                    Toast.makeText(getApplicationContext(),
                            listDataHeader.get(groupPosition) + " Expanded",
                            Toast.LENGTH_SHORT).show();
                }
            });

            // Listview Group collasped listener
            expListView.setOnGroupCollapseListener(new OnGroupCollapseListener() {

                @Override
                public void onGroupCollapse(int groupPosition) {
                    Toast.makeText(getApplicationContext(),
                            listDataHeader.get(groupPosition) + " Collapsed",
                            Toast.LENGTH_SHORT).show();

                }
            });

            // Listview on child click listener
            expListView.setOnChildClickListener(new OnChildClickListener() {

                @Override
                public boolean onChildClick(ExpandableListView parent, View v,
                        int groupPosition, int childPosition, long id) {
                    // TODO Auto-generated method stub
                    Toast.makeText(
                            getApplicationContext(),
                            listDataHeader.get(groupPosition)
                                    + " : "
                                    + listDataChild.get(
                                            listDataHeader.get(groupPosition)).get(
                                            childPosition), Toast.LENGTH_SHORT)
                            .show();
                    return false;
                }
            });
        }

        /*
         * Preparing the list data
         */
        private void prepareListData() {
            listDataHeader = new ArrayList<String>();
            listDataChild = new HashMap<String, List<String>>();

            // Adding child data
            listDataHeader.add("mylist0");
            listDataHeader.add("mylist1");
            listDataHeader.add("mylist2");

            // Adding child data
            List<String> top250 = new ArrayList<String>();
            mylist0.add("item1");
            mylist0.add("item2");
            mylist0.add("item3");

            List<String> mylist1 = new ArrayList<String>();
                mylist1.add("Item1");
            mylist1.add("Item2");
            mylist1.add("Item3");
            mylist1.add("Item4");
            mylist1.add("Item5");
            mylist1.add("Item6");

            List<String> mylist2 = new ArrayList<String>();
            mylist2.add("item1");


            listDataChild.put(listDataHeader.get(0), mylist0); // Header, Child data
            listDataChild.put(listDataHeader.get(1), mylist1);
            listDataChild.put(listDataHeader.get(2), mylist2);
        }
        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);
        } 

        public void setDimens()
        {
            Display display = getWindowManager().getDefaultDisplay();
            Point size = new Point();
            display.getSize(size);
            int width = size.x;
            int height = size.y;
            Display display2 = getWindowManager().getDefaultDisplay(); 
            int width2 = display2.getWidth();  // deprecated
            int height2 = display2.getHeight();  // deprecated
            //expListView.setIndicatorBounds(width2-GetDipsFromPixel(35), width2-GetDipsFromPixel(5)); //not works
            expListView.setIndicatorBounds(expListView.getRight()- 40, expListView.getWidth()); //not works

        }
    }

xml code:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical"
    android:background="#f4f4f4" >

            <ExpandableListView
                android:id="@+id/lvExp"
                android:layout_height="match_parent"
                android:layout_width="match_parent"
                android:cacheColorHint="#00000000"
                <!-- 
                android:indicatorLeft="250dp"
                android:indicatorRight="300dp"                          
                 -->
             />   

</LinearLayout>

Answer 1

请尝试这个，它在我的场景中起作用。这是可扩展listview的xml编码的 layout.xml

<ExpandableListView android:id="@+id/expandableListView1" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_alignParentLeft="true" android:layout_marginTop="50dp" android:groupIndicator="@drawable/group_indicator" android:cacheColorHint="#00000000" android:childDivider="@android:color/transparent" android:divider="#d4d4d4" android:dividerHeight="1dp" android:scrollbars="vertical|horizontal" > </ExpandableListView>

<强> group_indicator.xml

<?xml version="1.0" encoding="utf-8"?>

<item android:drawable="@drawable/arrow_right" android:state_empty="true"></item> <item android:drawable="@drawable/arrow_down" android:state_expanded="true"></item> <item android:drawable="@drawable/arrow_right"></item>

然后在java文件中编码。的 expandableExample.jav

DisplayMetrics metrics = new DisplayMetrics(); getWindowManager().getDefaultDisplay().getMetrics(metrics); int width = metrics.widthPixels; if(android.os.Build.VERSION.SDK_INT < android.os.Build.VERSION_CODES.JELLY_BEAN_MR2) { expandableListView.setIndicatorBounds(width - GetPixelFromDips(50), width - GetPixelFromDips(10)); searchExpListView.setIndicatorBounds(width - GetPixelFromDips(50), width - GetPixelFromDips(10)); } else { expandableListView.setIndicatorBoundsRelative(width - GetPixelFromDips(50), width - GetPixelFromDips(10)); searchExpListView.setIndicatorBoundsRelative(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); }

它是可扩展列表视图中右侧指示器的完整代码。

现在有可用的精美图书馆。如果您想使用recyclerview并希望使用自定义视图，请使用也解释可扩展示例的groupie库。 groupie。这个库需要android数据绑定。在recyclerview中处理多个视图，并具有可扩展功能。

可扩展列表视图指示器未设置在右侧

1 个答案: