如何在 ListView 中获取 EditText 文本

Posted 2023-05-07

【中文标题】如何在 ListView 中获取 EditText 文本

【英文标题】：How to get EditText Text inside ListView

【发布时间】：2014-06-13 18:33:23

【问题描述】：

我在 20 行的 ListView 中有一个 EditText。我想要单击按钮时所有 Edittext 文本的文本。应用程序崩溃，点击按钮时出现 NullPointerException 错误。这为前 11 行提供了值。之后它崩溃了，因为我认为这是向下滚动的视图。

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;



  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");

                 
             
        );

        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());

         vi.setOnClickListener(this);        

             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");
 TextView tv = (TextView)v.findViewById(R.id.textView1);
   int pos = (Integer)tv.getTag();
   Log.d("position of clicked item is", ""+pos);



/********* 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);
                   
   

按钮点击事件 在 11 行后失败..

 Button button =(Button)findViewById(R.id.button1);
    button.setOnClickListener(new View.OnClickListener() 
        public void onClick(View v) 

for (int i=0;i< 20;i++ )
         View vListSortOrder;
         vListSortOrder=list.getChildAt(i);     

         EditText edit=(EditText)vListSortOrder. findViewById(R.id.editText1);
        String temp1223=edit.getText().toString();

日志

 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)

【问题讨论】：

请添加您的日志崩溃

The App gets crash giving the NullPointerException Error on clicking of the button. 在哪里？

@SacreDeveloper 请检查

@GrIsHu 它的行 EditText 编辑 =(EditText)vListSortOrder。 findViewById(R.id.editText1);在第 11 行

从您的代码中删除这一行并尝试，if(convertView==null)

【参考方案1】：

使用 vListSortOrder=list.getAdapter().getView(i, null, null);

代替 vListSortOrder=list.getChildAt(i);

谢谢

【参考方案2】：

您必须存储editext的内容和其他信息以在模型的列表视图中显示，并创建该模型的arraylist。这有助于您在滚动时保持列表项状态并获得正确的内容。

然后在按钮上单击从该模型的arraylist 中获取内容...