自定义AlerDialog

Question

任何人有一个想法，为什么应用程序崩溃后点击“Dodaj”？ 当我使用默认值taskArray例如。 taskArray（新任务（ “例如”， “例如”）一切顺利。在下面的情况我警告对话框崩溃的应用程序。

public boolean onOptionsItemSelected(MenuItem item) { 
// Handle action bar item clicks here. The action bar will 
// automatically handle clicks on the Home/Up button, so long 
// as you specify a parent activity in AndroidManifest.xml. 
final int id = item.getItemId(); 

final EditText input1 = (EditText) findViewById(R.id.tematZadania); 
final EditText input2 = (EditText) findViewById(R.id.prioZadania); 


if (id == R.id.menuItem) { 
AlertDialog noweZadanie = new AlertDialog.Builder(MainActivity.this) 
.setTitle("Dodaj nowe zadanie") 
.setView(R.layout.pojedyncze_zadanie) 
.setPositiveButton("Dodaj", new DialogInterface.OnClickListener() { 
@Override 
public void onClick(DialogInterface dialog, int which) { 
Toast.makeText(getApplicationContext(), "ej", Toast.LENGTH_SHORT).show(); 
String item1 = String.valueOf(input1.getText()); 
String item2 = String.valueOf(input2.getText()); 
taskArray.add(new Task(item1, item2)); 
           //input1.setText(""); 
           //input2.setText(""); 
           taskArrayAdapter.notifyDataSetChanged(); 
          } 
         }) 
         .setNegativeButton("Anuluj", null) 
         .create(); 
       noweZadanie.show(); 
     } 
      if (id == R.id.menuItem2) { 
       finish(); 
       return true; 
      } 

      return super.onOptionsItemSelected(item); 
     } 

XML.file

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

    <EditText 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content" 
     android:inputType="textPersonName" 
     android:text="Name" 
     android:ems="10" 
     android:id="@+id/tematZadania" /> 

    <EditText 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content" 
     android:inputType="textPersonName" 
     android:text="Name" 
     android:ems="10" 
     android:id="@+id/prioZadania" /> 
</LinearLayout> 

登录

I/Timeline: Timeline: Activity_idle id: [email protected] time:204086971 
W/art: Before Android 4.1, method int android.support.v7.widget.ListViewCompat.lookForSelectablePosition(int, boolean) would have incorrectly overridden the package-private method in android.widget.ListView 
I/ListPopupWindow: Could not find method setEpicenterBounds(Rect) on PopupWindow. Oh well. 
D/AndroidRuntime: Shutting down VM 
E/AndroidRuntime: FATAL EXCEPTION: main 
        Process: com.example.piotr.todolist, PID: 2616 
        java.lang.NullPointerException: Attempt to invoke virtual method 'android.text.Editable android.widget.EditText.getText()' on a null object reference 
         at com.example.piotr.todolist.MainActivity$2.onClick(MainActivity.java:176) 
         at android.support.v7.app.AlertController$ButtonHandler.handleMessage(AlertController.java:161) 
         at android.os.Handler.dispatchMessage(Handler.java:102) 
         at android.os.Looper.loop(Looper.java:135) 
         at android.app.ActivityThread.main(ActivityThread.java:5319) 
         at java.lang.reflect.Method.invoke(Native Method) 
         at java.lang.reflect.Method.invoke(Method.java:372) 
         at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1016) 
         at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:811) 

Answer 1

你应该初始化的EditText像

View dialogView = inflater.inflate(R.layout.pojedyncze_zadanie,null); 
    builder.setView(dialogView); 

    EditText input1 = (EditText) dialogView .findViewById(R.id.tematZadania); 

Answer 2

您的应用程序崩溃在input1.getText（）

所以根据你的错误input1为空，检查你传递的“id”是否合适findViewById（）是合适的，同样适用于input2。

，并因为它是自定义AlertDialog，你应该做这样的事情： -

EditText input1 = (EditText) dialog.findViewById(.....);