android - 清除 ListView 中的 Android 编辑文本

Question

我的 ListView 中有一个编辑文本和一个保存按钮。当用户单击保存按钮时，我必须清除文本。我试过像

txtDescription.setText("");

但是没用。任何人都知道为什么它不起作用？ Adapter类附后

请帮助我，在此先感谢!!

private class ListAdapters extends ArrayAdapter<ApplicationBean> {
    private ArrayList<ApplicationBean> items;
    private int position;

    public ListAdapters(Context context, int textViewResourceId,
            ArrayList<ApplicationBean> mTitleList) {
        super(context, textViewResourceId, mTitleList);
        this.items = mTitleList;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        View v = convertView;
        this.position = position;
        if (v == null) {
            LayoutInflater inflater = (LayoutInflater) mContext
                    .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            v = inflater.inflate(R.layout.applicationlistitem, null);
        }

        final ApplicationBean o = (ApplicationBean) items.get(position);

        if (o != null) {

            txtDescription = (EditText) v
                    .findViewById(R.id.description_text);



            submitButton = (Button) v.findViewById(R.id.submit_btn);
            submitButton.setTag(position);
            submitButton.setOnClickListener(new OnClickListener() {

                @Override
                public void onClick(View v) {

                        PostRequest p = new PostRequest(Integer.parseInt(v
                                .getTag().toString()));
                        p.execute();
                }

            });
        }
        return v;
    }

    @Override
    public int getItemViewType(int position) {
        // TODO Auto-generated method stub
        return position;
    }

    @Override
    public int getViewTypeCount() {
        // TODO Auto-generated method stub
        return items.size();
    }

}



private class PostRequest extends AsyncTask<Void, Void, String> {
    ProgressDialog dlgprogress;
    int position;

    public PostRequest(int selectedIndex) {
        position = selectedIndex;
    }

    @Override
    protected void onPostExecute(String result) {
        dlgprogress.dismiss();
        final Dialog dlg = new AlertDialog.Builder(mContext)
                .setTitle("Message")
                .setMessage(result)
                .setPositiveButton("Ok",
                        new DialogInterface.OnClickListener() {
                            @Override
                            public void onClick(DialogInterface dialog,
                                    int whichButton) {
                                dlgprogress.dismiss();
                                dlgprogress.cancel();
                                txtDescription.setText("");
                            }
                        }).create();
        dlg.show();
        super.onPostExecute(result);
    }

    @Override
    protected void onPreExecute() {
        dlgprogress = ProgressDialog.show(mContext, "", "Please wait");
        // dlgprogress.show(mContext, "", "Please wait");
        super.onPreExecute();
    }

    @Override
    protected String doInBackground(Void... arg0) {
        //do something.............
        //..........................
        dlgprogress.dismiss();
        return rsponse;
    }

}

应用列表项.xml

 <?xml version="1.0" encoding="utf-8"?>
    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical" 
    android:background="#FFFFFF">



    <LinearLayout
        android:id="@+id/lineatlayout1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal" >

        <TextView
            android:id="@+id/textView2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="DESCRIPTION : "
            android:textAppearance="?android:attr/textAppearanceMedium"
            android:textColor="#000000" />

        <EditText
            android:id="@+id/description_text"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:clickable="true"
            android:ems="10"
            android:focusable="true"
            android:focusableInTouchMode="true"
            android:inputType="textMultiLine" 
            android:textColor="#000000">
        </EditText>
    </LinearLayout>

    <Button
        android:id="@+id/submit_btn"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="SUBMIT" />

   </LinearLayout>

Answer 1

维护 ListView 的自定义适配器类

 public View getView(final int position, View convertView, ViewGroup parent)
    {
        View row=null;
        Context context = getApplicationContext();
        LayoutInflater inflater=cntx.getLayoutInflater();
        row=inflater.inflate(R.layout.search_list_item, null);

        EditText txtDescription=    (EditText)row.findViewById(R.id.txtDescription);
        Button Savebtn  =   (Button)row.findViewById(R.id.SaveBtn);

        Savebtn.setOnClickListener(new OnClickListener(){

            public void onClick(View v) 
            {
                txtDescription.setText("");
                // And your additional coding
            }
        });
   }

如果您不熟悉 ListView 的自定义适配器，请检查 here