尝试在null对象引用上调用虚拟方法android.widget.EditText.getText()

时间:2018-07-05 16:55:56

标签: android android-edittext alertdialog

试图从对话框内的EditText获取Edit Text的值,但一次又一次地获得此错误

  

试图调用虚拟方法'android.text.Editable   NULL对象引用上的android.widget.EditText.getText()'

我在另一个对话框上扩大视图的效果很好,但是每当我在对话框中单击“确定”时,我都会不断收到上述错误

LayoutInflater li = LayoutInflater.from(getContext());
                View promptsView = li.inflate(R.layout.custom_dimension_dialog, null);
                AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(
                        getContext());
                // set prompts.xml to alertdialog builder
                alertDialogBuilder.setView(promptsView);
                alertDialogBuilder
                        .setCancelable(false)
                        .setPositiveButton("OK",
                                new OnClickListener() {
                                    public void onClick(DialogInterface dialog, int id) {
                                        // get user input and set it to result
                                        // edit text
                                        widthEditText = findViewById(R.id.Width);
                                        heightEditText = findViewById(R.id.Height);
                                        String width = widthEditText.getText().toString();
                                        String height = heightEditText.getText().toString();
                                        Toast.makeText(mContext, "Values are: " + width + " " + height, Toast.LENGTH_SHORT).show();
//                                        WIDTH=width
//                                        HEIGHT=height;
                                    }
                                })
                        .setNegativeButton("Cancel",
                                new OnClickListener() {
                                    public void onClick(DialogInterface dialog, int id) {
                                        dialog.cancel();
                                    }
                                }).show(); 

3 个答案:

答案 0 :(得分:1)

您需要从对话框视图中找到EditText。

widthEditText = promptsView.findViewById(R.id.Width);
heightEditText = promptsView.findViewById(R.id.Height);

答案 1 :(得分:1)

您未提供任何视图以这种方式更改代码

 widthEditText = promptsView.findViewById(R.id.Width);                                 
 heightEditText = promptsView.findViewById(R.id.Height);

答案 2 :(得分:1)

widthEditText = promptsView.findViewById(R.id.Width);
heightEditText = promptsView.findViewById(R.id.Height);

您需要以这种方式使用视图promptView.findviewbyId