Question

我正在尝试从“警告”对话框中的EditText字段中获取字符串，但是当代码运行时，它会一直崩溃，因为在引用edittext字段时它似乎变为空。

从其活动中调用以下方法，该方法将显示一个请求路径的警告对话框

    /** get path name */
    private void GetPathName() {
        AlertDialog.Builder path_name_builder = new AlertDialog.Builder(this);
        LayoutInflater path_name_inflater = this.getLayoutInflater();
        path_name_builder.setView(path_name_inflater.inflate(R.layout.pathname, null));
        path_name_builder.setTitle(R.string.pathnamedialog);
        // Add the buttons
        path_name_builder.setPositiveButton(R.string.ok, new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog, int id) {
                // User clicked OK button
                //retrieve path name
                EditText path_name_et = (EditText) findViewById(R.id.pathname);
////------> I keep getting a null for path_name_et! crashes after this point
                String path_name = path_name_et.getText().toString();
                //save data to file
                SaveData(path_name);
                finish();
            }
        });
        path_name_builder.setNegativeButton(R.string.cancel, new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog, int id) {
                // User cancelled the dialog
                dialog.cancel();
                finish();  //finish activity
            }
        });
        AlertDialog path_name_dialog = path_name_builder.create();
        path_name_dialog.show();

    }

这是警告对话框的xml：

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

    <EditText
        android:id="@+id/pathname"
        android:inputType="text"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="@string/pathnamehint"/>
</LinearLayout>

为什么我会为EditText引用获取null的任何想法？这似乎应该很简单，但我是android和java的新手，所以我正在学习。

Android无法在警告对话框中引用EditText

0 个答案: