在 BottomSheetDialogFragment 内部，我在导航视图中有一个可扩展列表视图。单击任何组项目后，我希望更改所选职位背景。在我实现了一种用于处理单击并更改 adapter 中的drawable的方法之后，它可以正常工作。但是，选择列表项后，它会更改主要活动中的片段，并随后调用dismiss方法，这导致抽屉就所选位置失去其状态。再次打开抽屉时，它将背景设置为第0个索引。
以下是 BottomSheet对话框的代码：
class BottomNavigationDrawerFragment : BottomSheetDialogFragment() {
private lateinit var rootView : View
private lateinit var callback: Callback
internal var expandableListView: ExpandableListView? = null
internal var adapter: ExpandableAdapter? = null
internal var titleList: List<String> ? = null
val data: LinkedHashMap<String, List<String>?>
get() {
val listData = LinkedHashMap<String, List<String>?>()
val list = ArrayList<String>()
list.add("aaaaaaaa")
list.add("bbbbb")
list.add("ccccccccccc")
listData.put("Home",null)
listData.put("Search",list)
listData.put("Contact Us",null)
return listData
}
fun fragment(cid : Int) {
var cat_frag = SubFragment()
val manager = activity!!.supportFragmentManager
val transaction = manager.beginTransaction()
transaction.replace(R.id.frame_lay, cat_frag)
transaction.addToBackStack(null)
transaction.commit()
return
}
fun register(list:ExpandableAdapter?,position: Int){
list?.onClickCallBack(position)
}
}
interface Callback{
fun onClickCallBack(position : Int)
}
override fun getTheme(): Int = R.style.BottomSheetDialogTheme
override fun onCreateDialog(savedInstanceState: Bundle?): Dialog = BottomSheetDialog(requireContext(), theme)
override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
rootView = inflater.inflate(R.layout.fragment_bottomsheet, container, false)
expandableListView = rootView.findViewById(R.id.expandableListView)
if (expandableListView != null) {
val listData = data
titleList = ArrayList(listData.keys)
adapter = ExpandableAdapter(activity!!, titleList as ArrayList<String>, listData)
expandableListView!!.setAdapter(adapter)
expandableListView!!.setOnGroupExpandListener { groupPosition ->
this.register(adapter,groupPosition)
when(groupPosition){
0 -> {
val textFragment = fragment1()
val manager = activity!!.supportFragmentManager
val transaction = manager.beginTransaction()
transaction.replace(R.id.frame_lay, textFragment)
transaction.addToBackStack(null)
transaction.commit()
this@BottomNavigationDrawerFragment.dismiss()
}
2 ->{
}
}
//Toast.makeText(activity!!, (titleList as ArrayList<String>)[groupPosition] + " List Expanded.", Toast.LENGTH_SHORT).show()
}
expandableListView!!.setOnGroupCollapseListener { groupPosition ->
when(groupPosition){
0 -> {
val textFragment = fragment1()
val manager = activity!!.supportFragmentManager
val transaction = manager.beginTransaction()
transaction.replace(R.id.frame_lay, textFragment)
transaction.addToBackStack(null
transaction.commit()
this@BottomNavigationDrawerFragment.dismiss()
}
2 ->{
}
}
}
expandableListView!!.setOnChildClickListener { parent, v, groupPosition, childPosition, id ->
// Toast.makeText(activity!!, "Clicked: " + (titleList as ArrayList<String>)[groupPosition] + " -> " + listData[(titleList as ArrayList<String>)[groupPosition]]!!.get(childPosition), Toast.LENGTH_SHORT).show()
when(childPosition){
0 ->{
this.register(adapter,2)
fragment(1)
this@BottomNavigationDrawerFragment.dismiss()
}
1 ->{
this.register(adapter,2)
fragment(2)
this@BottomNavigationDrawerFragment.dismiss()
}
2 ->{
fragment(3)
this@BottomNavigationDrawerFragment.dismiss()
}
}
false
}
}
return rootView
}
/*
override fun getTheme(): Int = R.style.BottomSheetDialogTheme
override fun onCreateDialog(savedInstanceState: Bundle?): Dialog = BottomSheetDialog(requireContext(), theme) */
override fun onActivityCreated(savedInstanceState: Bundle?) {
super.onActivityCreated(savedInstanceState)
}
以下是我的可扩展列表视图适配器：
class ExpandableAdapter internal constructor(private val context:
Context, private val titleList: List<String>, private val dataList:
LinkedHashMap<String, List<String>?>) :
BaseExpandableListAdapter(),BottomNavigationDrawerFragment.Callback {
var selected_position = 0
override fun getChild(listPosition: Int, expandedListPosition: Int): Any {
return this.dataList[this.titleList[listPosition]]!![expandedListPosition]
//return this.dataList.get(this.titleList.get(listPosition))!!.get(expandedListPosition)
}
override fun getChildId(listPosition: Int, expandedListPosition: Int): Long {
return expandedListPosition.toLong()
}
override fun getChildView(listPosition: Int, expandedListPosition: Int, isLastChild: Boolean, convertView: View?, parent: ViewGroup): View {
var convertView = convertView
val expandedListText = getChild(listPosition, expandedListPosition) as String
if (convertView == null) {
val layoutInflater = this.context.getSystemService(Context.LAYOUT_INFLATER_SERVICE) as LayoutInflater
convertView = layoutInflater.inflate(R.layout.child_view, null)
}
val image = convertView!!.findViewById<ImageView>(R.id.image)
val text = convertView!!.findViewById<TextView>(R.id.item_text)
if(listPosition == 1){
text.setText(expandedListText)
}
image.setImageResource(R.drawable.fresh)
return convertView
}
override fun getChildrenCount(listPosition: Int): Int {
//Log.d("nnnnnnnnnnnnnnnnnnnnn",this.dataList[this.titleList[listPosition]]!!.size.toString())
if(listPosition == 1){
return this.dataList[this.titleList[listPosition]]!!.size
}
else{
return 0
}
}
override fun getGroup(listPosition: Int): Any {
return this.titleList[listPosition]
}
override fun onClickCallBack(position: Int) {
this.selected_position =position
}
override fun getGroupCount(): Int {
return this.titleList.size
}
override fun getGroupId(listPosition: Int): Long {
return listPosition.toLong()
}
override fun getGroupView(listPosition: Int, isExpanded: Boolean, convertView: View?, parent: ViewGroup): View {
var convertView = convertView
val listTitle = getGroup(listPosition) as String
if (convertView == null) {
val layoutInflater = this.context.getSystemService(Context.LAYOUT_INFLATER_SERVICE) as LayoutInflater
convertView = layoutInflater.inflate(R.layout.parent_view, null)
}
val listTitleTextView = convertView!!.findViewById<TextView>(R.id.item_text)
val image_left = convertView!!.findViewById<ImageView>(R.id.image_left)
val image_right = convertView!!.findViewById<ImageView>(R.id.image_right)
listTitleTextView.setTypeface(null, Typeface.BOLD)
listTitleTextView.setText(listTitle)
val layout = convertView!!.findViewById<RelativeLayout>(R.id.main_layout)
if(listPosition == selected_position){
layout.setBackgroundColor(context.resources.getColor(R.color.colorPrimaryDark))
}
else{
layout.setBackgroundColor(context.resources.getColor(R.color.white))
}
return convertView
}
override fun hasStableIds(): Boolean {
return false
}
override fun isChildSelectable(listPosition: Int, expandedListPosition: Int): Boolean {
return true
}
}
谢谢您的帮助！
答案 0 :(得分：0)
要保留底部对话框的片段状态，您可以按照以下方式进行操作，我创建了一个简单的示例，任何人都可以理解：
首先创建一个名为
的xml文件。fragment_bottomsheet
<?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"
android:background="@android:color/transparent"
android:orientation="vertical">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="150dp"
android:layout_margin="20dp"
android:background="@android:color/holo_red_dark"
android:orientation="vertical">
<TextView
android:id="@+id/tv_old_value"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:textColor="@android:color/white"
android:background="@android:color/holo_green_dark"
android:layout_margin="10dp"
android:layout_alignParentBottom="true"
android:paddingBottom="10dp"
android:paddingTop="10dp"
android:text="0" />
</RelativeLayout>
</RelativeLayout>
然后创建名为
的BottomSheetDialogFragmentBottomSheetFragment
import android.app.Dialog;
import android.content.DialogInterface;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.design.widget.BottomSheetDialog;
import android.support.design.widget.BottomSheetDialogFragment;
import android.view.View;
import android.widget.FrameLayout;
import android.widget.TextView;
public class BottomSheetFragment extends BottomSheetDialogFragment {
BottomSheetDialog dialog;
Integer myOldValue = 0;
TextView tvOldValue;
public static BottomSheetFragment newInstance() {
BottomSheetFragment fragment = new BottomSheetFragment();
return fragment;
}
@Override
public void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
@Override
public void setupDialog(Dialog dialog, int style) {
View contentView = View.inflate(getContext(), R.layout.fragment_bottomsheet, null);
dialog.setContentView(contentView);
tvOldValue = contentView.findViewById(R.id.tv_old_value);
tvOldValue.setText(String.valueOf(myOldValue));
((View) contentView.getParent()).setBackgroundColor(getResources().getColor(android.R.color.transparent));
}
@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
dialog = (BottomSheetDialog) super.onCreateDialog(savedInstanceState);
dialog.setOnShowListener(new DialogInterface.OnShowListener() {
@Override
public void onShow(DialogInterface dialog) {
BottomSheetDialog d = (BottomSheetDialog) dialog;
FrameLayout bottomSheet = (FrameLayout) d.findViewById(android.support.design.R.id.design_bottom_sheet);
tvOldValue.setText(String.valueOf(myOldValue));
}
});
return dialog;
}
@Override
public BottomSheetDialog getDialog() {
return dialog;
}
public void setDialog(BottomSheetDialog dialog) {
this.dialog = dialog;
}
public Integer getMyOldValue() {
return myOldValue;
}
public void setMyOldValue(Integer myOldValue) {
this.myOldValue = myOldValue;
}
}
然后创建MainActivity并将该bottomsheetdialogfragment对象作为全局对象，不要破坏它们，而是尝试从如下所示的对话框中隐藏和显示：
MainActivity
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
public class MainActivity extends AppCompatActivity {
Button btnShow;
BottomSheetFragment bottomSheetDialog;
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btnShow = findViewById(R.id.btnShow);
bottomSheetDialog = BottomSheetFragment.newInstance();
bottomSheetDialog.show(getSupportFragmentManager(), "Bottom Sheet Dialog Fragment");
btnShow.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
bottomSheetDialog.setMyOldValue(bottomSheetDialog.getMyOldValue() + 1);
bottomSheetDialog.getDialog().show();
}
});
}
}
观看完此示例后，您会看到BottomSheetFragment中存在myOldValue，该对话框每次在屏幕上显示具有更新值的对话框时都会打印。因此，通过这种方式，我们可以保留底板的状态而不会破坏底板。希望对大家有帮助！