在自定义对话框中获得空指针异常

Question

嘿，我正在创建一个包含2个editText的自定义对话框。我不知道这段代码有什么问题，但每当用户点击提交时，它都会在editText中声明空值。

任何人都可以帮忙吗？

下面是对自定义对话框

private void showPriceDialog() { 
     final AlertDialog.Builder builder = new AlertDialog.Builder(this); 
     final View dialogView = LayoutInflater.from(this).inflate(R.layout.content_price_filter,null); 
     //Button submitBtn = (Button)findViewById(R.id.submitBtn); 

     builder.setView(dialogView); 
     final android.support.design.widget.TextInputEditText minPrice = (android.support.design.widget.TextInputEditText)findViewById(R.id.minPrice); 
     final android.support.design.widget.TextInputEditText maxPrice = (android.support.design.widget.TextInputEditText)findViewById(R.id.maxPrice); 

     builder.setTitle("Set Price"); 
     builder.setPositiveButton("Submit", new DialogInterface.OnClickListener() { 
      @Override 
      public void onClick(DialogInterface dialog, int which) { 


       String max = maxPrice.getText().toString(); 
       String min = minPrice.getText().toString(); 
       if (max.equals("") || min.equals("")){ 
        Toast.makeText(getApplicationContext(),"empty fields",Toast.LENGTH_SHORT).show(); 
        return; 
       } 
       mPriceValueTxt.setText(max + " Rs min :"+ min); 
      } 
     }); 
     builder.setNegativeButton("Cancel", new DialogInterface.OnClickListener() { 
      @Override 
      public void onClick(DialogInterface dialog, int which) { 
        dialog.dismiss(); 
      } 
     }); 
     AlertDialog al = builder.create(); 
     al.show(); 
} 

下面的代码是自定义对话框布局的布局

<?xml version="1.0" encoding="utf-8"?> 
<android.support.constraint.ConstraintLayout 
    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:layout_width="match_parent" 
    android:layout_height="match_parent"> 


    <android.support.design.widget.TextInputLayout 
     android:id="@+id/minPriceSelector" 
     android:layout_width="0dp" 
     android:layout_height="wrap_content" 
     android:layout_marginTop="8dp" 
     android:ems="10" 
     android:inputType="text" 
     app:layout_constraintLeft_toLeftOf="parent" 
     app:layout_constraintTop_toTopOf="parent" 
     app:layout_constraintRight_toLeftOf="@+id/maxPriceSelector" 
     android:layout_marginRight="8dp" 
     android:layout_marginLeft="8dp"> 

     <android.support.design.widget.TextInputEditText 
      android:id="@+id/minPrice" 
      android:layout_width="match_parent" 
      android:layout_height="match_parent" 
      android:hint="Min Price" 
      android:inputType="number" 
      android:singleLine="true" /> 

    </android.support.design.widget.TextInputLayout> 

    <android.support.design.widget.TextInputLayout 
     android:id="@+id/maxPriceSelector" 
     android:layout_width="0dp" 
     android:layout_height="wrap_content" 
     android:layout_marginTop="8dp" 
     android:ems="10" 
     android:inputType="text" 
     app:layout_constraintLeft_toRightOf="@+id/minPriceSelector" 
     app:layout_constraintRight_toRightOf="parent" 
     app:layout_constraintTop_toTopOf="parent" 
     android:layout_marginLeft="8dp" 
     android:layout_marginRight="8dp"> 

     <android.support.design.widget.TextInputEditText 
      android:id="@+id/maxPrice" 
      android:layout_width="match_parent" 
      android:layout_height="match_parent" 
      android:hint="Max Price" 
      android:inputType="number" 
      android:singleLine="true" /> 

    </android.support.design.widget.TextInputLayout> 
</android.support.constraint.ConstraintLayout> 

这同时点击提交

09-03 13:11:30.180 22652-22652/com.example.ashis.propertysearch E/AndroidRuntime: FATAL EXCEPTION: main 
                        Process: com.example.ashis.propertysearch, PID: 22652 
                        java.lang.NullPointerException: Attempt to invoke virtual method 'android.text.Editable android.support.design.widget.TextInputEditText.getText()' on a null object reference 
                         at com.example.ashis.propertysearch.FiltersActivity$1.onClick(FiltersActivity.java:290) 
                         at android.support.v7.app.AlertController$ButtonHandler.handleMessage(AlertController.java:161) 
                         at android.os.Handler.dispatchMessage(Handler.java:102) 
                         at android.os.Looper.loop(Looper.java:154) 
                         at android.app.ActivityThread.main(ActivityThread.java:6204) 
                         at java.lang.reflect.Method.invoke(Native Method) 
                         at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:891) 
                         at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:781) 

Answer 1

我收到错误

你必须像下面这样做。

builder.setView(dialogView); 
     final android.support.design.widget.TextInputEditText minPrice = (android.support.design.widget.TextInputEditText) dialogView.findViewById(R.id.minPrice); 
     final android.support.design.widget.TextInputEditText maxPrice = (android.support.design.widget.TextInputEditText) dialogView.findViewById(R.id.maxPrice);