ListView Crash onItemClick中的EditText来自第11行

时间:2014-04-28 04:40:22

标签: android android-fragments android-listview android-edittext android-checkbox

我在20行EditText内有CheckboxListView。前7行隐藏EditText,所有其他行隐藏CheckBoxonItemClick对于前7行是可见的,然后对其他行是隐藏的。 toast我已经让Edittext获取了NullPointerException的文本,该文本适用于启动10行但不适用于滚动时出现的最后一行。应用程序崩溃后会发送{ {1}}错误

public View getView(int position, View convertView, ViewGroup parent) {



    View vi=convertView;
    ViewHolder holder;

    if(convertView==null){ 

        /********** Inflate tabitem.xml file for each row ( Defined below ) ************/
        vi = inflater.inflate(R.layout.tabitem, null); 

        /******** View Holder Object to contain tabitem.xml file elements ************/
        holder=new ViewHolder();
        holder.text=(TextView)vi.findViewById(R.id.textView1);

        holder.check =(CheckBox)vi.findViewById(R.id.checkBox1);
         holder.text2=(EditText)vi.findViewById(R.id.editText1);

       /************  Set holder with LayoutInflater ************/
        vi.setTag(holder);


        j++;

        if(j<8){
       holder.text2.setVisibility(View.INVISIBLE);
       holder.check.setX(-150);
        }else
        {
             holder.check.setVisibility(View.INVISIBLE);
        }



    }
    else  
        holder=(ViewHolder)vi.getTag();

    holder.text2.getText();
       if(data.size()<=0)
    {
        holder.text.setText("No Data");

        holder.text2.getText();
 //        Log.v("BBBB",  holder.text2.getText().toString());

    }
    else
    {
        /***** Get each Model object from Arraylist ********/
        tempValues=null;
        tempValues = (ListModel) data.get(position);

        /************  Set Model values in Holder elements ***********/
         holder.text.setText(tempValues.getCompanyName());

         holder.text2.getText();
                         /******** Set Item Click Listner for LayoutInflater for each row ***********/
         vi.setOnClickListener(new OnItemClickListener(position));
    }

    Log.v("DDD",  holder.text2.getText().toString());
    return vi;
}

 @Override
public int getViewTypeCount() {
    return getCount();
}


 @Override
public int getItemViewType(int position) {
   return position; 
}

但是应用程序崩溃了onITemClick方法......甚至EditText文本都会导致错误...

  public void onItemClick(int mPosition)
{


     View vListSortOrder;
     vListSortOrder=list.getChildAt(mPosition);     
     Log.d("valueeeeeeee", Integer.toString(mPosition));

     EditText edit=(EditText)vListSortOrder.findViewById(R.id.editText1);
   String temp=edit.getText().toString();
}


public void onClick(View arg0) { 
CustomListViewAndroidExample sct = (CustomListViewAndroidExample)activity; sct.onItemClick(mPosition); }

上面的onItemClick可以很好地启动10行..但是在第11行,它会在EditText edit行崩溃并出现空指针异常错误

logcat的

04-28 00:46:29.101: W/dalvikvm(2178): threadid=1: thread exiting with uncaught exception (group=0x41465700)
04-28 00:46:29.161: E/AndroidRuntime(2178): FATAL EXCEPTION: main
04-28 00:46:29.161: E/AndroidRuntime(2178): java.lang.NullPointerException
04-28 00:46:29.161: E/AndroidRuntime(2178):     at com.androidexample.customlistview.CustomListViewAndroidExample.onItemClick(CustomListViewAndroidExample.java:172)
04-28 00:46:29.161: E/AndroidRuntime(2178):     at com.androidexample.customlistview.CustomAdapter$OnItemClickListener.onClick(CustomAdapter.java:222)

完整的适配器代码

 @SuppressLint("NewApi") public class CustomAdapter extends BaseAdapter   implements OnClickListener {

/*********** Declare Used Variables *********/
 private Activity activity;
 private ArrayList data;
 private static LayoutInflater inflater=null;
 public Resources res;
 ListModel tempValues=null;
 int i=0;

int j=0;

public ArrayList<String> selectedStrings = new ArrayList<String>();


/*************  CustomAdapter Constructor *****************/
public CustomAdapter(Activity a, ArrayList d,Resources resLocal) {

    /********** Take passed values **********/
    activity = a;
    data=d;
    res = resLocal;

    /***********  Layout inflator to call external xml layout () **********************/
    inflater = (LayoutInflater)activity.getSystemService(Context.LAYOUT_INFLATER_SERVICE);

}

/******** What is the size of Passed Arraylist Size ************/
public int getCount() {

    if(data.size()<=0)
        return 1;
    return data.size();
}

public Object getItem(int position) {
    return data.get(position);
}

public long getItemId(int position) {
    return 0;
}

/********* Create a holder to contain inflated xml file elements ***********/
public static class ViewHolder{

    public TextView text;
    public TextView text1;
    public EditText text2;
    public TextView textWide;
    public ImageView image;
    public CheckBox check;

}

/*********** Depends upon data size called for each row , Create each ListView row ***********/
public View getView(int position, View convertView, ViewGroup parent) {



    View vi=convertView;
    final ViewHolder holder;

    if(convertView==null){ 

        /********** Inflate tabitem.xml file for each row ( Defined below ) ************/
        vi = inflater.inflate(R.layout.tabitem, null); 

        /******** View Holder Object to contain tabitem.xml file elements ************/
        holder=new ViewHolder();
        holder.text=(TextView)vi.findViewById(R.id.textView1);

        holder.check =(CheckBox)vi.findViewById(R.id.checkBox1);
                holder.text2=(EditText)vi.findViewById(R.id.editText1);



       holder.check.setOnClickListener(new OnClickListener(){

           @Override
             public void onClick(View v) 
             {
                 if (((CheckBox) v).isChecked()) 
                 {
                     holder.text2.setText("Checked");


                 }
                 else
                 {
                     holder.text2.setText("Not Checked");

                 }
             }
        });



       /************  Set holder with LayoutInflater ************/
        vi.setTag(holder);



        j++;

        if(j<8){
       holder.text2.setVisibility(View.INVISIBLE);
       holder.check.setX(-150);
       holder.check.setVisibility(View.VISIBLE);

        }else
        {
             holder.check.setVisibility(View.INVISIBLE);
             holder.text2.setVisibility(View.VISIBLE);

        }



    }
    else  
        holder=(ViewHolder)vi.getTag();

    holder.text2.getText();
      if(data.size()<=0)
    {
        holder.text.setText("No Data");

        holder.text2.getText();

    }
    else
    {
        /***** Get each Model object from Arraylist ********/
        tempValues=null;
        tempValues = (ListModel) data.get(position);

        /************  Set Model values in Holder elements ***********/
         holder.text.setText(tempValues.getCompanyName());

         /******** Set Item Click Listner for LayoutInflater for each row ***********/
         vi.setOnClickListener(new OnItemClickListener(position));
    }



    return vi;
}

@Override
public int getViewTypeCount() {
    return getCount();
}


@Override
public int getItemViewType(int position) {
   return position; 
}


@Override
public void onClick(View v) {
        Log.v("CustomAdapter", "=====Row button clicked");
}

/********* Called when Item click in ListView ************/
private class OnItemClickListener  implements OnClickListener{           
    private int mPosition;

    OnItemClickListener(int position){
         mPosition = position;
    }

    @Override
    public void onClick(View arg0) {
        CustomListViewAndroidExample sct = (CustomListViewAndroidExample)activity;
        sct.onItemClick(mPosition);
    }               
}   

}

04-28 03:33:23.542: E/AndroidRuntime(4917): FATAL EXCEPTION: main
04-28 03:33:23.542: E/AndroidRuntime(4917): java.lang.NullPointerException
04-28 03:33:23.542: E/AndroidRuntime(4917):     at com.androidexample.customlistview.CustomListViewAndroidExample$1.onClick(CustomListViewAndroidExample.java:89)
04-28 03:33:23.542: E/AndroidRuntime(4917):     at android.view.View.performClick(View.java:4240)
04-28 03:33:23.542: E/AndroidRuntime(4917):     at android.view.View$PerformClick.run(View.java:17721)
04-28 03:33:23.542: E/AndroidRuntime(4917):     at android.os.Handler.handleCallback(Handler.java:730)

2 个答案:

答案 0 :(得分:0)

你写了令人困惑的代码。

将标签插入到text2:

holder.text2.setTag(1);

然后使用下一行:

int position12 = (Integer)holder.text2.getTag();

所以每次position12等于1。

接下来就是使用j而不是位置。

您需要更改自己的可见度,就像跟随代码一样,因为ListView's recycling

if(j<8){

     holder.text2.setVisibility(View.INVISIBLE);
     holder.check.setVisibility(View.VISIBLE);
     holder.check.setX(-150);

 }else{
     holder.text2.setVisibility(View.VISIBLE);
     holder.check.setVisibility(View.INVISIBLE);
  }

并且由于您有一个布局,为什么要覆盖getViewTypeCountgetItemViewType

请从getView方法

中删除以下行
 holder.text2.getText();

 Log.v("DDD",  holder.text2.getText().toString());

您的问题

你的问题是:

private class OnItemClickListener  implements OnClickListener{           
    private int mPosition;

    OnItemClickListener(int position){
         mPosition = position;
    }

    @Override
    public void onClick(View arg0) {
        CustomListViewAndroidExample sct = (CustomListViewAndroidExample)activity;
        sct.onItemClick(mPosition);  <--- problem is here
    }               
}   

我不知道你想要什么,但你可以这样做。

1-改变:

 vi.setOnClickListener(new OnItemClickListener(position));

 vi.setOnClickListener(this);

2-为getView方法添加以下行:

  holder.text.setTag(position);

3-将以下代码添加到onClick方法:

@Override
public void onClick(View v) {
       TextView tv = (TextView)v.findViewById(R.id.textView1);
       int pos = (Integer)tv.getTag();
       Log.d("position of clicked item is", ""+pos);
}

4-改变

if(j<8)

if( position <8)

答案 1 :(得分:0)

1。始终记得在扩展BaseAdapter时覆盖这三种方法:

@Override
public int getCount() {
    return your_objects_list.size();
}

@Override
public YourObjectType getItem(int position) {

    return your_objects_list.get(position);
}

@Override
public long getItemId(int position) {
// you could return any id related to your context, i just return 0 because I don't need it

    return 0;
}

2.摆脱这些方法:

你绝对不需要这些:


 @Override
public int getViewTypeCount() {
    return getCount();
}


 @Override
public int getItemViewType(int position) {
   return position; 
}

看,让我解释你何时应该使用这些方法:

<强> getViewTypeCount

此方法应返回您正在使用的不同 XML布局文件的数量。例如,如果您对行使用row_layout_1.xml和row_layout_2.xml文件,则getViewTypeCount()应始终返回2.

因此,如果您对所有行使用单个.XML文件,那么您真的不应该覆盖此方法。

<强> getItemViewType

此方法在单个列表项上调用时,应返回该类型。在我之前提到的例子中,它应该根据项目的位置返回1或2。

由于您使用的是单个XML行类型,因此您也不应该覆盖此方法。

让我知道你的结果。

3.根本不要使用j,而是使用position

移动此代码并在返回vi之前将其放置一行;

    if(position <8){
   holder.text2.setVisibility(View.INVISIBLE);
   holder.check.setX(-150);
   holder.check.setVisibility(View.VISIBLE);

    }else
    {
         holder.check.setVisibility(View.INVISIBLE);
         holder.text2.setVisibility(View.VISIBLE);

    }

让我知道你的结果。