在可扩展列表视图中，通过单击（子级）CheckedTextview
作为初学者级android开发人员，我需要帮助。我创建了一个可扩展的
带有（父项）textview和（Child）已检查textview的android studio中的listview全部
工作正常，但我想在其中添加更多内容。当我单击子列表项时
（至少有一个孩子），它必须更改相应的（父）textview
背景颜色。这是我的代码和快照。请帮帮我。
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity"
android:orientation="vertical"
>
<ExpandableListView
android:layout_weight="9"
android:id="@+id/exp_list"
android:layout_width="match_parent"
android:layout_height="0dp"
android:divider="#CECECE"
/>
<Button
android:visibility="gone"
android:layout_weight="1"
android:layout_gravity="bottom"
android:layout_width="match_parent"
android:layout_height="0dp"
android:id="@+id/next"
android:gravity="center"
android:text="next"
android:textColor="#FFF"
android:background="@color/colorPrimary"
/>
</LinearLayout>
parent_layout.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:descendantFocusability="beforeDescendants"
>
<View
android:id="@+id/view"
android:layout_width="match_parent"
android:layout_height="8dp"
android:background="#F3F3F3"/>
<LinearLayout
android:gravity="center"
android:layout_width="match_parent"
android:layout_height="60dp"
android:orientation="horizontal"
android:background="#FFF"
android:baselineAligned="false"
android:layout_gravity="center"
>
<TextView
android:elevation="5dp"
android:textColor="@color/colorBlack"
android:textSize="14sp"
android:gravity="left|center"
android:paddingStart="45dp"
android:id="@+id/heading_item"
android:text="Abc"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingLeft="35dp" />
</LinearLayout>
</LinearLayout>
row_layout.xml
<?xml version="1.0" encoding="utf-8"?>
<CheckedTextView xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:background="#FFFFFF"
android:backgroundTint="#F3F3F3"
android:layout_width="match_parent"
android:layout_height="40dp"
android:textSize="13sp"
android:gravity="center"
android:text="abc"
android:layout_marginStart="20dp"
android:layout_marginEnd="20dp"
android:textColor="#4B4B4B"
android:paddingLeft="50dp"
android:paddingRight="10dp"
android:id="@+id/child_item"
android:layout_gravity="center_vertical"
android:checked="false"
android:checkMark="?android:attr/listChoiceIndicatorMultiple"
/>
MainActivity.class
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.CheckedTextView;
import android.widget.ExpandableListView;
import android.widget.TextView;
import android.widget.Toast;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
public class MainActivity extends AppCompatActivity {
Button next;
static List<String> course=new ArrayList<>();
static HashMap<String, List<String>> subjects=new HashMap<String, List<String>> ();
List<String> selectedsubjects=new ArrayList<>();
ExpandableListView Exp_list;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
next=findViewById(R.id.next);
Exp_list=findViewById(R.id.exp_list);
preparedatadata();
final String status[][]=new String[subjects.size()][];
String status1[]=new String[course.size()];
for(int i=0;i<course.size();i++){
status[i]=new String[5];
status1[i]=ConstantManager.CHECK_BOX_CHECKED_FALSE;
for(int j=0;j<subjects.get(course.get(i)).size();j++){
status[i][j]=ConstantManager.CHECK_BOX_CHECKED_FALSE;
}
}
Exp_list.setAdapter(new CustomExpendibleViewAdaptor(getApplicationContext(),course,subjects,false,status,status1));
Exp_list.setOnChildClickListener(new ExpandableListView.OnChildClickListener() {
@Override
public boolean onChildClick(ExpandableListView parent, View v, int groupPosition, int childPosition, long id) {
Log.e("groupPosition: "+groupPosition,"childPosition: "+childPosition);
if(status[groupPosition][childPosition].equals(ConstantManager.CHECK_BOX_CHECKED_TRUE)){
Log.e("YES :groupPosition: "+groupPosition,"childPosition: "+childPosition);
((CheckedTextView)v.findViewById(R.id.child_item)).setChecked(false);
status[groupPosition][childPosition]=ConstantManager.CHECK_BOX_CHECKED_FALSE;
}
else {
Log.e("NO :groupPosition: "+groupPosition,"childPosition: "+childPosition);
status[groupPosition][childPosition]=ConstantManager.CHECK_BOX_CHECKED_TRUE;
((CheckedTextView)v.findViewById(R.id.child_item)).setChecked(true);
}
String selectedItem=((TextView)v).getText().toString();
// Log.e("groupPosition: "+groupPosition,"selectedItem: "+selectedItem);
if(selectedsubjects.contains(selectedItem)){
selectedsubjects.remove(selectedItem); //add item for check
}
else {
selectedsubjects.add(selectedItem); //remove item for uncheck
}
if(selectedsubjects.isEmpty()){
next.setVisibility(View.GONE);
}
else {
next.setVisibility(View.VISIBLE);
}
return true;
}
});
Exp_list.setOnGroupClickListener(new ExpandableListView.OnGroupClickListener() {
@Override
public boolean onGroupClick(ExpandableListView parent, View v, int groupPosition, long id) {
Log.e("groupPosition: "+groupPosition,"id: "+id);
return false;
}
});
next.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
String list="";
for(String l:selectedsubjects){
list+=l+", ";
}
Toast.makeText(getApplicationContext(),list+"",Toast.LENGTH_LONG).show();
}
});
}
void preparedatadata(){
course.add("Class 1-5");
course.add("B.Tech");
course.add("B.Com");
course.add("MCA");
course.add("ISC");
course.add("BSC");
course.add("PHD");
course.add("Fashion designing");
course.add("Cricket");
course.add("ISRO");
course.add("Uma-clases");
List<String> l1=new ArrayList<>();
List<String> l2=new ArrayList<>();
List<String> l3=new ArrayList<>();
List<String> l4=new ArrayList<>();
List<String> l5=new ArrayList<>();
List<String> l6=new ArrayList<>();
List<String> l7=new ArrayList<>();
List<String> l8=new ArrayList<>();
List<String> l9=new ArrayList<>();
List<String> l10=new ArrayList<>();
List<String> l11=new ArrayList<>();
l1.add(course.get(0)+" - "+"English");
l1.add(course.get(0)+" - "+"Math");
l1.add(course.get(0)+" - "+"Science");
l2.add(course.get(1)+" - "+"Java");
l2.add(course.get(1)+" - "+"Python");
l2.add(course.get(1)+" - "+"Android");
l3.add(course.get(2)+" - "+"Accountancy");
l3.add(course.get(2)+" - "+"Economics");
l3.add(course.get(2)+" - "+"Business Study");
l4.add(course.get(3)+" - "+"Computer 1");
l4.add(course.get(3)+" - "+"Computer 2");
l4.add(course.get(3)+" - "+"Computer 3");
l5.add(course.get(4)+" - "+"Math");
l5.add(course.get(4)+" - "+"Physics");
l5.add(course.get(4)+" - "+"Chemistry");
l6.add(course.get(5)+" - "+"math honors");
l6.add(course.get(5)+" - "+"English 1");
l6.add(course.get(5)+" - "+"English 2");
l7.add(course.get(6)+" - "+"Phd paper 1");
l7.add(course.get(6)+" - "+"Phd paper 2");
l7.add(course.get(6)+" - "+"Phd paper 3");
l8.add(course.get(7)+" - "+"Dress desigining");
l8.add(course.get(7)+" - "+"Interior Decorating");
l9.add(course.get(8)+" - "+"Ball Catch ");
l9.add(course.get(8)+" - "+"Batting practice");
l9.add(course.get(8)+" - "+"Bowling Practice");
l10.add(course.get(9)+" - "+"Making Astronuot");
l10.add(course.get(9)+" - "+"Making Scientist");
l11.add(course.get(10)+" - "+"Coming Course 1");
l11.add(course.get(10)+" - "+"Coming Course 2");
l11.add(course.get(10)+" - "+"Coming Course 3");
subjects.put(course.get(0),l1);
subjects.put(course.get(1),l2);
subjects.put(course.get(2),l3);
subjects.put(course.get(3),l4);
subjects.put(course.get(4),l5);
subjects.put(course.get(5),l6);
subjects.put(course.get(6),l7);
subjects.put(course.get(7),l8);
subjects.put(course.get(8),l9);
subjects.put(course.get(9),l10);
subjects.put(course.get(10),l11);
}
}
CustomExpendibleViewAdaptor.class
import android.annotation.SuppressLint;
import android.content.Context;
import android.content.res.ColorStateList;
import android.graphics.Color;
import android.graphics.Typeface;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseExpandableListAdapter;
import android.widget.CheckedTextView;
import android.widget.TextView;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
public class CustomExpendibleViewAdaptor extends BaseExpandableListAdapter {
HashMap<String, List<String>> subjects;
List<String> course=new ArrayList<>();
private boolean isFromMyCategoriesFragment;
private Context context;
String status[][];
String status1[];
LayoutInflater inflater;
CustomExpendibleViewAdaptor(Context context , List<String> course, HashMap<String, List<String>> subjects, boolean isFromMyCategoriesFragment, String status[][], String status1[]){
this.context=context;
this.course=course;
this.subjects=subjects;
this.isFromMyCategoriesFragment=isFromMyCategoriesFragment;
this.status=status;
this.status1=status1;
}
@Override
public int getGroupCount() {
return course.size();
}
@Override
public int getChildrenCount(int groupPosition) {
return subjects.get(course.get(groupPosition)).size();
}
@Override
public Object getGroup(int groupPosition) {
return course.get(groupPosition);
}
@Override
public Object getChild(int groupPosition, int childPosition) {
return subjects.get( course.get(groupPosition)).get(childPosition);
}
@Override
public long getGroupId(int groupPosition) {
return groupPosition;
}
@Override
public long getChildId(int groupPosition, int childPosition) {
return childPosition;
}
@Override
public boolean hasStableIds() {
return false;
}
@Override
public View getGroupView(final int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) {
Log.e("Adaptor: ","getGroupView()");
if (convertView==null) {
inflater = (LayoutInflater) this.context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView=inflater.inflate(R.layout.parent_layout,(ViewGroup) null);
}
convertView.setTag(getGroup(groupPosition).toString());
View view=convertView.findViewById(R.id.view);
// view.setMinimumHeight(20);
TextView grouptextchecked=convertView.findViewById(R.id.heading_item);
// grouptextchecked.setTypeface(null, Typeface.BOLD);
// grouptextchecked.setHeight(100);
grouptextchecked.setText(getGroup(groupPosition).toString());
grouptextchecked.setTextColor(Color.parseColor("#000000"));
return convertView;
}
@SuppressLint("ResourceType")
@Override
public View getChildView(final int groupPosition, final int childPosition, boolean isLastChild, View convertView, ViewGroup parent) {
Log.e("Adaptor: ","getChildView()");
final ViewHolderChild viewHolderChild;
String child=(String) this.getChild(groupPosition,childPosition);
if (convertView == null) {
Log.e("ExpandableListAdapter -","getChildView()-null");
inflater = (LayoutInflater) this.context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView=inflater.inflate(R.layout.row_layout,null);
viewHolderChild = new ViewHolderChild();
viewHolderChild.checkedTextView = convertView.findViewById(R.id.child_item);
convertView.setTag(viewHolderChild);
}
else {
Log.e("ExpandableListAdapter -","getChildView()-not null");
viewHolderChild = (ViewHolderChild) convertView.getTag();
}
if (status[groupPosition][childPosition].equalsIgnoreCase(ConstantManager.CHECK_BOX_CHECKED_TRUE)) {
Log.e("ExpandableListAdapter -","getChildView()-if");
viewHolderChild.checkedTextView.setChecked(true);
notifyDataSetChanged();
} else {
Log.e("ExpandableListAdapter -","getChildView()-else");
viewHolderChild.checkedTextView.setChecked(false);
notifyDataSetChanged();
}
viewHolderChild.checkedTextView.setText(child);
if (viewHolderChild.checkedTextView.isChecked()) {
Log.e("ExpandableListAdapter -","viewHolderChild.checkedTextView.isChecked(");
status[groupPosition][childPosition]=ConstantManager.CHECK_BOX_CHECKED_TRUE;
notifyDataSetChanged();
} else {
Log.e("ExpandableListAdapter -","not .isChecked(");
status[groupPosition][childPosition]=ConstantManager.CHECK_BOX_CHECKED_FALSE;
notifyDataSetChanged();
}
return convertView;
}
@Override
public boolean isChildSelectable(int groupPosition, int childPosition) {
return true;
}
private class ViewHolderChild {
CheckedTextView checkedTextView;
}
}
ConstantManager.class
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
public class ConstantManager {
public static final String CHECK_BOX_CHECKED_TRUE = "YES";
public static final String CHECK_BOX_CHECKED_FALSE = "NO";
}
现在快点
输出1：-
输出2：-
0 个答案:
没有答案
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