如何在自定义警报对话框中设置文本？

Question

我一直在尝试以编程方式更改由自定义警报对话框放大的视图中的文本。在我的应用中，自定义布局中的文本应根据各种情况进行更改

我尝试使用setText（），但没有任何反应。也没有任何错误。

这是我的代码：

MainActivity.java

public class MainActivity extends AppCompatActivity {
    Button button;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        button = (Button) findViewById(R.id.button);

        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                LayoutInflater inflater = getLayoutInflater();
                View dialogLayout = inflater.inflate(R.layout.dialog, null);
                TextView textView=(TextView)dialogLayout.findViewById(R.id.textView);
                textView.setText("Changed");
                AlertDialog.Builder builder=new AlertDialog.Builder(MainActivity.this);
                builder.setView(R.layout.dialog);
                textView.setText("Changed");


                builder.setTitle("sdfdsf");
                builder.setPositiveButton("OK",null).create()
                        .show();
        }});
    }
}

dialog.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <TextView
        android:text="Course"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/textView"
        android:textColor="@android:color/holo_red_light"
        android:layout_marginTop="16dp"
        app:layout_constraintTop_toTopOf="parent"
        android:layout_marginStart="16dp"
        app:layout_constraintLeft_toLeftOf="parent" />

    <TextView
        android:text="Room"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/textView8"
        android:textColor="@android:color/holo_red_light"
        android:layout_below="@+id/textView2"
        android:layout_alignStart="@+id/textView" />

    <TextView
        android:text="Slot"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/textView2"
        android:textColor="@android:color/holo_red_light"
        android:layout_below="@+id/textView"
        android:layout_alignStart="@+id/textView8" />

    <TextView
        android:text="1205"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        tools:layout_editor_absoluteX="94dp"
        android:id="@+id/textView4"
        app:layout_constraintBaseline_toBaselineOf="@+id/textView8"
        android:layout_alignBaseline="@+id/textView8"
        android:layout_alignBottom="@+id/textView8"
        android:layout_toEndOf="@+id/textView"
        android:layout_marginStart="22dp" />

    <TextView
        android:text="D"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        tools:layout_editor_absoluteX="81dp"
        android:id="@+id/textView3"
        app:layout_constraintBaseline_toBaselineOf="@+id/textView2"
        android:layout_alignBottom="@+id/textView2"
        android:layout_alignStart="@+id/textView4" />

    <TextView
        android:text="Oops using C++"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        tools:layout_editor_absoluteX="94dp"
        android:id="@+id/textView6"
        app:layout_constraintBaseline_toBaselineOf="@+id/textView"
        android:layout_alignBaseline="@+id/textView"
        android:layout_alignBottom="@+id/textView"
        android:layout_alignStart="@+id/textView3" />
</RelativeLayout>

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.knby.temp.MainActivity">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Hello World!" />

    <Button
        android:text="Button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_alignParentStart="true"
        android:layout_marginStart="41dp"
        android:layout_marginBottom="165dp"
        android:id="@+id/button" />
</RelativeLayout>

Answer 1

组

builder.setView(dialogLayout); 

代替

builder.setView(R.layout.dialog);

您需要两次设置布局。

Answer 2

更改您的此代码

AlertDialog.Builder builder=new AlertDialog.Builder(MainActivity.this);
builder.setView(R.layout.dialog);

对此

AlertDialog.Builder builder=new AlertDialog.Builder(MainActivity.this);
builder.setView(dialogLayout);

您已添加此行builder.setView(dialogLayout); 而不是这个builder.setView(R.layout.dialog);

Answer 3

更改

LayoutInflater inflater = getLayoutInflater(); 

至

LayoutInflater inflater = LayoutInflater.from(context);

Answer 4

只需使用您正在使用的东西（Dialog，AlertDialog，Dialog.Builder），就像这样：

Dialog dlog = new Dialog(this , your Theme ) ;
Dlog,setTitle("is this dialog ? ");