IndexOutOfBoundsException異常在擴張的ListView

根據這個偉大的答案Android ExpandableListView with Checkbox, Controlling checked state我做我的課，但我得到一個錯誤的logcat ArrayList.IndexOutOfBoundsExceptionIndexOutOfBoundsException異常在擴張的ListView

mMyClass

public ArrayList<String> groups; 
public ArrayList<ArrayList<ArrayList<String>>> childs; 
.......... 
ArrayList < ArrayList <Integer>> check_states =new ArrayList < ArrayList < Integer>>(); 

public class myExpandableAdapter extends BaseExpandableListAdapter {  
private ArrayList<String> groups; 
private ArrayList<ArrayList<ArrayList<String>>> children; 
private final Context context ; 

public myExpandableAdapter(Context context,ArrayList<String> groups, ArrayList<ArrayList<ArrayList<String>>> children) { 
this.context = context; 
this.groups = groups; 
this.children = children; } 

public void setChildrenAndValues(ArrayList< ArrayList< ArrayList< String>>> c) { 
    this.children = c; 

    //initialize the states to all 0; 
    for(int i = 0; i < c.size(); i++) { 

     ArrayList<Integer> tmp = new ArrayList<Integer>(); 
     for(int j = 0; j < c.size(); j++) { 
      tmp.add(0); 
     } 
     check_states.add(tmp); 
    } 
} 

@Override 
public boolean areAllItemsEnabled() 
{ 
    return true; 
} 


@Override 
public ArrayList<String> getChild(int groupPosition, int childPosition) { 
return children.get(groupPosition).get(childPosition); 
} 

@Override 
public long getChildId(int groupPosition, int childPosition) { 
    return childPosition; 
} 


@Override 
public View getChildView(final int groupPosition, final int childPosition, boolean  isLastChild,View convertView, ViewGroup parent) { 

String child = (String) ((ArrayList<String>)getChild(groupPosition, childPosition)).get(0); 

if (convertView == null) { 
    LayoutInflater infalInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
    convertView = infalInflater.inflate(R.layout.exp_list_child, null); 
} 

TextView childtxt = (TextView) convertView.findViewById(R.id.list_child1); 

childtxt.setText(child); 
/// 
final View tick = findViewById(R.id.checkBox1); 
if(check_states.get(groupPosition).get(childPosition) == 1) 
    tick.setVisibility(View.VISIBLE); 
else 
    tick.setVisibility(View.GONE); 

convertView.setOnClickListener(new OnClickListener(){ 
    public void onClick(View v) { 
     check_states.get(groupPosition).set(childPosition, 1); 
     Toast.makeText(getApplicationContext(),""+ check_states, Toast.LENGTH_SHORT).show(); 
     tick.setVisibility(View.VISIBLE); 
    } 
}); 

return convertView; 
} 

@Override 
public int getChildrenCount(int groupPosition) { 
    return children.get(groupPosition).size(); 
} 

@Override 
public String getGroup(int groupPosition) { 
    return groups.get(groupPosition); 
} 

@Override 
public int getGroupCount() { 
    return groups.size(); 
} 

@Override 
public long getGroupId(int groupPosition) { 
    return groupPosition; 
} 

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

String group = (String) getGroup(groupPosition); 

if (convertView == null) { 
    LayoutInflater infalInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
    convertView = infalInflater.inflate(R.layout.exp_list_group, null); 
} 

TextView grouptxt = (TextView) convertView.findViewById(R.id.ListHeader); 

grouptxt.setText(group); 

return convertView; 
} 

@Override 
public boolean hasStableIds() { 
    return true; 
} 

@Override 
public boolean isChildSelectable(int arg0, int arg1) { 
    return true; 
} 

public void loadData(){ 
groups= new ArrayList<String>(); 
childs= new ArrayList<ArrayList<ArrayList<String>>>(); 

int proion_id= getIntent().getExtras().getInt("proionId"); 
    int length = dbAdapter.getDetailsOf(proion_id).size(); 
if(length >0) { 

for (int i=0; i< length; i++) 
{ 
    childs.add(new ArrayList<ArrayList<String>>()); 
    childs.get(i).add(new ArrayList<String>()); 
    childs.get(i).get(0).add("A"); 
    childs.get(i).add(new ArrayList<String>()); 
    childs.get(i).get(1).add("B"); 
    childs.get(i).add(new ArrayList<String>()); 
    childs.get(i).get(2).add("C"); 

} 

} else 
{childs.add(new ArrayList<ArrayList<String>>()); 
childs.get(0).add(new ArrayList<String>()); 
childs.get(0).get(0).add("NO");} 

} 

    }

提前logcat的

> 07-03 03:42:57.168: E/AndroidRuntime(1644): java.lang.IndexOutOfBoundsException: Invalid index 0, size is 0 
07-03 03:42:57.168: E/AndroidRuntime(1644):  at java.util.ArrayList.throwIndexOutOfBoundsException(ArrayList.java:255) 
07-03 03:42:57.168: E/AndroidRuntime(1644):  at java.util.ArrayList.get(ArrayList.java:308) 
07-03 03:42:57.168: E/AndroidRuntime(1644):  at com.techblogon.loginexample.ItemComments$myExpandableAdapter.getChildView(ItemComments.java:156) 
07-03 03:42:57.168: E/AndroidRuntime(1644):  at android.widget.ExpandableListConnector.getView(ExpandableListConnector.java:451) 
07-03 03:42:57.168: E/AndroidRuntime(1644):  at android.widget.AbsListView.obtainView(AbsListView.java:2263) 
07-03 03:42:57.168: E/AndroidRuntime(1644):  at android.widget.ListView.measureHeightOfChildren(ListView.java:1263) 
07-03 03:42:57.168: E/AndroidRuntime(1644):  at android.widget.ListView.onMeasure(ListView.java:1175) 
07-03 03:42:57.168: E/AndroidRuntime(1644):  at android.view.View.measure(View.java:16497) 
07-03 03:42:57.168: E/AndroidRuntime(1644):  at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5125) 
07-03 03:42:57.168: E/AndroidRuntime(1644):  at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1404) 
07-03 03:42:57.168: E/AndroidRuntime(1644):  at android.widget.LinearLayout.measureVertical(LinearLayout.java:695) 
07-03 03:42:57.168: E/AndroidRuntime(1644):  at android.widget.LinearLayout.onMeasure(LinearLayout.java:588) 
07-03 03:42:57.168: E/AndroidRuntime(1644):  at android.view.View.measure(View.java:16497) 
07-03 03:42:57.168: E/AndroidRuntime(1644):  at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5125) 
07-03 03:42:57.168: E/AndroidRuntime(1644):  at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1404) 
07-03 03:42:57.168: E/AndroidRuntime(1644):  at android.widget.LinearLayout.measureVertical(LinearLayout.java:695) 
07-03 03:42:57.168: E/AndroidRuntime(1644):  at android.widget.LinearLayout.onMeasure(LinearLayout.java:588) 
07-03 03:42:57.168: E/AndroidRuntime(1644):  at android.view.View.measure(View.java:16497) 
07-03 03:42:57.168: E/AndroidRuntime(1644):  at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5125) 
07-03 03:42:57.168: E/AndroidRuntime(1644):  at android.widget.FrameLayout.onMeasure(FrameLayout.java:310) 
07-03 03:42:57.168: E/AndroidRuntime(1644):  at android.view.View.measure(View.java:16497) 
07-03 03:42:57.168: E/AndroidRuntime(1644):  at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5125) 
07-03 03:42:57.168: E/AndroidRuntime(1644):  at android.widget.FrameLayout.onMeasure(FrameLayout.java:310) 
07-03 03:42:57.168: E/AndroidRuntime(1644):  at android.view.View.measure(View.java:16497) 
07-03 03:42:57.168: E/AndroidRuntime(1644):  at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5125) 
07-03 03:42:57.168: E/AndroidRuntime(1644):  at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1404) 
07-03 03:42:57.168: E/AndroidRuntime(1644):  at android.widget.LinearLayout.measureVertical(LinearLayout.java:695) 
07-03 03:42:57.168: E/AndroidRuntime(1644):  at android.widget.LinearLayout.onMeasure(LinearLayout.java:588) 
07-03 03:42:57.168: E/AndroidRuntime(1644):  at android.view.View.measure(View.java:16497) 
07-03 03:42:57.168: E/AndroidRuntime(1644):  at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5125) 
07-03 03:42:57.168: E/AndroidRuntime(1644):  at android.widget.FrameLayout.onMeasure(FrameLayout.java:310) 
07-03 03:42:57.168: E/AndroidRuntime(1644):  at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2291) 
07-03 03:42:57.168: E/AndroidRuntime(1644):  at android.view.View.measure(View.java:16497) 
07-03 03:42:57.168: E/AndroidRuntime(1644):  at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:1916) 
07-03 03:42:57.168: E/AndroidRuntime(1644):  at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1113) 
07-03 03:42:57.168: E/AndroidRuntime(1644):  at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1295) 
07-03 03:42:57.168: E/AndroidRuntime(1644):  at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1000) 
07-03 03:42:57.168: E/AndroidRuntime(1644):  at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:5670) 
07-03 03:42:57.168: E/AndroidRuntime(1644):  at android.view.Choreographer$CallbackRecord.run(Choreographer.java:761) 
07-03 03:42:57.168: E/AndroidRuntime(1644):  at android.view.Choreographer.doCallbacks(Choreographer.java:574) 
07-03 03:42:57.168: E/AndroidRuntime(1644):  at android.view.Choreographer.doFrame(Choreographer.java:544) 
07-03 03:42:57.168: E/AndroidRuntime(1644):  at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:747) 
07-03 03:42:57.168: E/AndroidRuntime(1644):  at android.os.Handler.handleCallback(Handler.java:733) 
07-03 03:42:57.168: E/AndroidRuntime(1644):  at android.os.Handler.dispatchMessage(Handler.java:95) 
07-03 03:42:57.168: E/AndroidRuntime(1644):  at android.os.Looper.loop(Looper.java:136) 
07-03 03:42:57.168: E/AndroidRuntime(1644):  at android.app.ActivityThread.main(ActivityThread.java:5017) 
07-03 03:42:57.168: E/AndroidRuntime(1644):  at java.lang.reflect.Method.invokeNative(Native Method) 
07-03 03:42:57.168: E/AndroidRuntime(1644):  at java.lang.reflect.Method.invoke(Method.java:515) 
07-03 03:42:57.168: E/AndroidRuntime(1644):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779) 
07-03 03:42:57.168: E/AndroidRuntime(1644):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595) 
07-03 03:42:57.168: E/AndroidRuntime(1644):  at dalvik.system.NativeStart.main(Native Method)

謝謝

來源

2014-07-03 Seth De

和？.......................... –

@deathember可能問題是c.size（），但我找不到如何解決它 –

Yeap，你說得對。我想你需要了解'調試'？如果不是 - 谷歌它。這將有助於你解決這個問題和未來的問題。 –

你可能（不）看到y我們的日誌告訴你，在getChildView的內部，當它的大小實際上爲零時，你正在訪問一個數組的第一個元素。

我不知道爲什麼你的數組沒有加載數據，但如果你在訪問陣列之前增加一個檢查，它可以幫助：

if (getChild(groupPosition, childPosition) > 0) 
    String child = getChild(groupPosition, childPosition).get(0);

如果你的數組不是在所有初始化它會拋出一個不同錯誤表示您嘗試訪問NullPointer。

來源

2014-07-03 08:47:22 Simas

IndexOutOfBoundsException異常在擴張的ListView

回答

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