Android ExpandableListView -UnsupportedOperationException: AdapterView 不支持 addView(View, LayoutParams)
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ExpandableListView -UnsupportedOperationException: addView(View, LayoutParams) is not supported in AdapterView
提问by Gaurav Arora
I am implementing Expandable List view in android and i am getting the above titled error. Please help me.
我正在 android 中实现可扩展列表视图，但出现上述错误。请帮我。
Main activity is -
主要活动是——
package com.expand;
import android.app.Activity;
import android.os.Bundle;
import android.util.DisplayMetrics;
import android.util.Log;
import android.view.View;
import android.widget.ExpandableListView;
import android.widget.Toast;
public class MyExpandableListViewActivity extends Activity {
/** Called when the activity is first created. */
static final String groupElements[]= {
"India",
"Australia",
"England",
"South Africa"
};
static final String[][] childElements=
{
{
"Sachin Tendulkar",
"Raina",
"Dhoni",
"Yuvi"
},
{
"Ponting",
"Adam Gilchrist",
"Michael Clarke"
},
{
"Andrew Strauss",
"kevin Peterson",
"Nasser Hussain"
},
{
"Graeme Smith",
"AB de villiers",
"Jacques Kallis"
}
};
DisplayMetrics metrics;
int width;
ExpandableListView expandList;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
expandList = (ExpandableListView)findViewById(R.id.expandList1);
metrics = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(metrics);
width = metrics.widthPixels;
//ExpAdapter adapter = new ExpAdapter(MyExpandableListViewActivity.this, groupElements, childElements);
expandList.setAdapter(new ExpAdapter(MyExpandableListViewActivity.this, groupElements, childElements));
expandList.setIndicatorBounds(width - GetDipsFromPixel(50), width - GetDipsFromPixel(10));
expandList.setOnGroupExpandListener(new ExpandableListView.OnGroupExpandListener() {
@Override
public void onGroupExpand(int groupPosition) {
// TODO Auto-generated method stub
Log.e("onGroupExpand", "OK");
}
});
expandList.setOnGroupCollapseListener(new ExpandableListView.OnGroupCollapseListener() {
@Override
public void onGroupCollapse(int groupPosition) {
// TODO Auto-generated method stub
Log.e("onGroupCollapse", "OK");
}
});
expandList.setOnChildClickListener(new ExpandableListView.OnChildClickListener() {
@Override
public boolean onChildClick(ExpandableListView parent, View v,
int groupPosition, int childPosition, long id) {
//getting the item that is selected
//String s = (String) expandList.getItemAtPosition((int) id);
Toast.makeText(MyExpandableListViewActivity.this, "You have selected :" , Toast.LENGTH_SHORT).show();
return false;
}
});
}
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);
}
}
ExpAdapter class is - I have implemented the adapter in other class and have called it in mt main activity
ExpAdapter 类是 - 我已经在其他类中实现了适配器，并在 mt main 活动中调用了它
package com.expand;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseExpandableListAdapter;
import android.widget.TextView;
public class ExpAdapter extends BaseExpandableListAdapter {
public Context myContext;
public String[][] childElements;
TextView childValues;
public String[] groupElements;
public ExpAdapter(Context context, String[] group, String[][] childs)
{
this.myContext=context;
this.groupElements = group;
this.childElements = childs;
}
@Override
public Object getChild(int groupPosition, int childPosition) {
// TODO Auto-generated method stub
return childElements[groupPosition][childPosition];
}
@Override
public long getChildId(int groupPosition, int childPosition) {
// TODO Auto-generated method stub
return 0;
}
@Override
public View getChildView(int groupPosition, int childPosition,
boolean isLastChild, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
if(convertView==null){
LayoutInflater inflator = (LayoutInflater)myContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = inflator.inflate(R.layout.child_rows, parent);
}
childValues = (TextView)convertView.findViewById(R.id.rowValues);
childValues.setText(childElements[groupPosition][childPosition]);
return convertView;
}
@Override
public int getChildrenCount(int groupPosition) {
// TODO Auto-generated method stub
return groupElements[groupPosition].length();
}
@Override
public Object getGroup(int groupPosition) {
// TODO Auto-generated method stub
return groupElements[groupPosition];
}
@Override
public int getGroupCount() {
// TODO Auto-generated method stub
return groupElements.length;
}
@Override
public long getGroupId(int groupPosition) {
// TODO Auto-generated method stub
return 0;
}
@Override
public View getGroupView(int groupPosition, boolean isExpanded,
View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
if(convertView==null){
LayoutInflater inflator = (LayoutInflater)myContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = inflator.inflate(R.layout.group_rows, null);
}
TextView group = (TextView)convertView.findViewById(R.id.groupId);
group.setText(groupElements[groupPosition]);
return convertView;
}
@Override
public boolean hasStableIds() {
// TODO Auto-generated method stub
return false;
}
@Override
public boolean isChildSelectable(int groupPosition, int childPosition) {
// TODO Auto-generated method stub
return true;
}
}
main.xml-
main.xml-
this is the xnl that is displayed at the first by the main activity
这是主要活动首先显示的xnl
<?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" >
<ExpandableListView
android:id="@+id/expandList1"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<TextView
android:id="@+id/android:empty"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
</TextView>
</ExpandableListView>
</LinearLayout>
group_row.xml
group_row.xml
this is the xml for the group elements
这是组元素的 xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/gropu_name"
android:layout_width="fill_parent"
android:layout_height="40dp"
android:orientation="vertical" >
<TextView
android:id="@+id/groupId"
android:layout_height="40dp"
android:layout_width="wrap_content"
android:paddingLeft="30dp"
android:gravity="center_vertical"
android:textSize="16dp"
android:textStyle="bold"
/>
</LinearLayout>
child_row.xml this is the xml for the child elements
child_row.xml 这是子元素的 xml
<?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="40dp"
android:orientation="horizontal" >
<TextView
android:id="@+id/rowValues"
android:layout_width="wrap_content"
android:layout_height="30dp"
android:gravity="center_vertical"
android:paddingLeft="50dp"
android:textSize="12dp" />
</LinearLayout>
回答by Prashant Gami
Seems like Adapterview does not allow adding new view, I encountered same problem
好像 Adapterview 不允许添加新视图，我遇到了同样的问题
Solve it by replacing following line
通过替换以下行来解决它
convertView = inflator.inflate(R.layout.child_rows, parent);
to
到
convertView = inflator.inflate(R.layout.child_rows, null);
UPDATE
更新
Instead of not using a parent at all, you should simply tell the Inflater not to attach the inflated view to the parent with
而不是根本不使用父级，您应该简单地告诉 Inflater 不要将膨胀的视图附加到父级
convertView = inflator.inflate(R.layout.child_rows, parent, false);
See also this answer.
另请参阅此答案。
The reason is that adapter takes care of attaching views to parent itself.
原因是适配器负责将视图附加到父级本身。
回答by Justin
Note that you can also get this error when your layout xml is invalid.
请注意，当您的布局 xml 无效时，您也会收到此错误。
回答by B-GangsteR
As were noted above,
如上所述，
Instead of not using a parent at all, you should simply tell the Inflater not to attach the inflated view to the parent with
而不是根本不使用父级，您应该简单地告诉 Inflater 不要将膨胀的视图附加到父级
convertView = inflator.inflate(R.layout.child_rows, parent, false);
See also this answer.
另请参阅此答案。
The reason is that adapter takes care of attaching views to parent itself.
原因是适配器负责将视图附加到父级本身。
回答by sirFunkenstine
According to Android Lint your child view should always provide a reference to its parent view when inflated. I had the exact same error in my code. Is was occurring because the TextView was placed inside the ExpandableListView. When I rearranged my xml layout the error stopped appearing.
根据 Android Lint，您的子视图在膨胀时应始终提供对其父视图的引用。我的代码中有完全相同的错误。之所以发生是因为 TextView 被放置在 ExpandableListView 中。当我重新排列我的 xml 布局时，错误不再出现。
回答by Illegal Argument
This error can also be caused because of instant runfeature. I was working on listview and because of this error app kept crashing. Uninstalling the app and running again resolved the error.
由于即时运行功能，也可能导致此错误。我正在处理 listview 并且因为这个错误应用程序一直崩溃。卸载应用程序并再次运行解决了错误。
