Android 带有自定义布局和编辑文本的AlertDialog.Builder;无法访问视图

Android 带有自定义布局和编辑文本的AlertDialog.Builder;无法访问视图,android,Android,我正在尝试使用EditText对象创建警报对话框。我需要以编程方式设置EditText的初始文本。这是我的 AlertDialog.Builder dialogBuilder = new AlertDialog.Builder(this); // ...Irrelevant code for customizing the buttons and title AlertDialog alertDialog = dialogBuilder.create(); LayoutInflater infl

我正在尝试使用
EditText
对象创建警报对话框。我需要以编程方式设置
EditText
的初始文本。这是我的

AlertDialog.Builder dialogBuilder = new AlertDialog.Builder(this);
// ...Irrelevant code for customizing the buttons and title
AlertDialog alertDialog = dialogBuilder.create();
LayoutInflater inflater = this.getLayoutInflater();
alertDialog.setContentView(inflater.inflate(R.layout.alert_label_editor, null));
EditText editText = (EditText) findViewById(R.id.label_field);
editText.setText("test label");
alertDialog.show();
我需要更改什么才能拥有有效的
EditText
对象

[编辑]

因此,user370305和其他人指出我应该使用
alertDialog.findViewById(R.id.label_字段)

不幸的是,这里还有另一个问题。显然,在
AlertDialog
上设置内容视图会导致程序在运行时崩溃。你必须在生成器上设置它

AlertDialog.Builder dialogBuilder = new AlertDialog.Builder(this);
// ...Irrelevant code for customizing the buttons and title
dialogBuilder.setView(inflater.inflate(R.layout.alert_label_editor, null));
AlertDialog alertDialog = dialogBuilder.create();
LayoutInflater inflater = this.getLayoutInflater();
EditText editText = (EditText) alertDialog.findViewById(R.id.label_field);
editText.setText("test label");
alertDialog.show();
不幸的是,执行此操作时,
alertDialog.findviewbyd(R.id.label_字段)
现在返回
null


[/edit]

editText
alertDialog
布局的一部分,因此只需参考
alertDialog
访问
editText

EditText editText = (EditText) alertDialog.findViewById(R.id.label_field);
更新:

因为在代码行
dialogBuilder.setView中(充气器.inflate(R.layout.alert_label_editor,null))

充气机

按照下面的方式更新代码,并尝试理解每个代码行的含义

AlertDialog.Builder dialogBuilder = new AlertDialog.Builder(this);
// ...Irrelevant code for customizing the buttons and title
LayoutInflater inflater = this.getLayoutInflater();
View dialogView = inflater.inflate(R.layout.alert_label_editor, null);
dialogBuilder.setView(dialogView);

EditText editText = (EditText) dialogView.findViewById(R.id.label_field);
editText.setText("test label");
AlertDialog alertDialog = dialogBuilder.create();
alertDialog.show();
更新2:

当您使用充气机创建的视图对象来更新UI组件时,您可以直接使用API 21及以后版本中的AlertDialog.Builder类的
setView(int layourResId)
方法进行更改:

View v=inflater.inflate(R.layout.alert_label_editor, null);
alertDialog.setContentView(v);
EditText editText = (EditText)v.findViewById(R.id.label_field);
editText.setText("test label");
alertDialog.show();
EditText editText = (EditText) findViewById(R.id.label_field);
为此:

EditText editText = (EditText)  v.findViewById(R.id.label_field);
用这个

   AlertDialog.Builder builder = new AlertDialog.Builder(activity);
    // Get the layout inflater
    LayoutInflater inflater = (activity).getLayoutInflater();
    // Inflate and set the layout for the dialog
    // Pass null as the parent view because its going in the
    // dialog layout
    builder.setTitle(title);
    builder.setCancelable(false);
    builder.setIcon(R.drawable.galleryalart);
    builder.setView(inflater.inflate(R.layout.dialogue, null))
    // Add action buttons
            .setPositiveButton("OK", new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int id) {

                    }
                }
            });
    builder.create();
    builder.show();
你可以写:

AlertDialog.Builder dialogBuilder = new AlertDialog.Builder(this);

 // ...Irrelevant code for customizing the buttons and title

LayoutInflater inflater = this.getLayoutInflater(); 

View dialogView= inflater.inflate(R.layout.alert_label_editor, null);                    
dialogBuilder.setView(dialogView);

Button button = (Button)dialogView.findViewById(R.id.btnName);

   button.setOnClickListener(new View.OnClickListener() {
       @Override
       public void onClick(View view) {

         //Commond here......

       }
   });

EditText editText = (EditText)
dialogView.findViewById(R.id.label_field); 

editText.setText("test label"); 

dialogBuilder.create().show();

如果有人想在Kotlin得到它:

val dialogBuilder = AlertDialog.Builder(this)
// ...Irrelevant code for customizing the buttons and title
val dialogView = layoutInflater.inflate(R.layout.alert_label_editor, null)
dialogBuilder.setView(dialogView)

val editText =  dialogView.findViewById(R.id.label_field)
editText.setText("test label")
val alertDialog = dialogBuilder.create()
alertDialog.show()

重新发布答案。

U也可以这样做:
dialogBuilder.setView(R.layout.dialog\U布局)@SiavA此方法仅在API 21中可用。我一直在尝试显示对话框,但它在RecyclerView中不起作用,但此方法起作用。当未定义
充气机时,可以使用
getLayoutInflater()
。@saigopi当覆盖onClick时,将有参数(DialogInterface Dialog,int id)。在这个onClick方法中,只需传递dialog.cancel();应该是
builder.create().show(),您可以检查
builder.show()代码了解更多详细信息
val dialogBuilder = AlertDialog.Builder(this)
// ...Irrelevant code for customizing the buttons and title
val dialogView = layoutInflater.inflate(R.layout.alert_label_editor, null)
dialogBuilder.setView(dialogView)

val editText =  dialogView.findViewById(R.id.label_field)
editText.setText("test label")
val alertDialog = dialogBuilder.create()
alertDialog.show()