DatePickerDialogを表示するとアプリケーションがクラッシュする

Question

次のコードを使用して、onClickメソッドにDatePickerDialogを表示しています。ユーザーが日付を選択すると、テキストビューで設定します。 DatePickerDialogが呼び出されている5行目でエラーが発生しています。私はそれをデバッグしようとしました、エラーは正確な行にあり、私はそれを把握することができません。

ただし、このメソッドを呼び出すときには、次のメッセージが表示されてアプリケーションがクラッシュします。ここで

FATAL EXCEPTION: main 
Process: com.example.bisma.calendar_analyzer, PID: 3882 
android.view.InflateException: Binary XML file line #20: Binary XML file 
line #20: Error inflating class <unknown> 
at android.view.LayoutInflater.inflate(LayoutInflater.java:539) 
at android.view.LayoutInflater.inflate(LayoutInflater.java:423) 
at android.view.LayoutInflater.inflate(LayoutInflater.java:374) 
at android.app.DatePickerDialog.<init>(DatePickerDialog.java:112) 
at android.app.DatePickerDialog.<init>(DatePickerDialog.java:82) 
at com.example.bisma.calendar_analyzer.ui.CreateEventActivity.onClick(CreateEventActivity.java:100) 
at android.view.View.performClick(View.java:5204) 
at android.view.View$PerformClick.run(View.java:21153) 
at android.os.Handler.handleCallback(Handler.java:739) 
at android.os.Handler.dispatchMessage(Handler.java:95) 
at android.os.Looper.loop(Looper.java:148) 
at android.app.ActivityThread.main(ActivityThread.java:5417) 
at java.lang.reflect.Method.invoke(Native Method) 
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726) 
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616) 
Caused by: android.view.InflateException: Binary XML file line #20: Error inflating class <unknown> 
at android.view.LayoutInflater.createView(LayoutInflater.java:645) 
at com.android.internal.policy.PhoneLayoutInflater.onCreateView(PhoneLayoutInflater.java:58) 
at android.view.LayoutInflater.onCreateView(LayoutInflater.java:694) 
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:762) 
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:704) 
at android.view.LayoutInflater.inflate(LayoutInflater.java:492) 
at android.view.LayoutInflater.inflate(LayoutInflater.java:423)  
at android.view.LayoutInflater.inflate(LayoutInflater.java:374)  
at android.app.DatePickerDialog.<init>(DatePickerDialog.java:112)  
at android.app.DatePickerDialog.<init>(DatePickerDialog.java:82)  
at com.example.bisma.calendar_analyzer.ui.CreateEventActivity.onClick(CreateEventActivity.java:100)  
at android.view.View.performClick(View.java:5204)  
at android.view.View$PerformClick.run(View.java:21153)  
at android.os.Handler.handleCallback(Handler.java:739)  
at android.os.Handler.dispatchMessage(Handler.java:95)  
at android.os.Looper.loop(Looper.java:148)  
at android.app.ActivityThread.main(ActivityThread.java:5417)  
at java.lang.reflect.Method.invoke(Native Method)  
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)  
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)  
Caused by: java.lang.reflect.InvocationTargetException 
at java.lang.reflect.Constructor.newInstance(Native Method) 
at android.view.LayoutInflater.createView(LayoutInflater.java:619) 
at com.android.internal.policy.PhoneLayoutInflater.onCreateView(PhoneLayoutInflater.java:58)  
at android.view.LayoutInflater.onCreateView(LayoutInflater.java:694)  
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:762)  
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:704)  
at android.view.LayoutInflater.inflate(LayoutInflater.java:492)  
at android.view.LayoutInflater.inflate(LayoutInflater.java:423)  
at android.view.LayoutInflater.inflate(LayoutInflater.java:374)  
at android.app.DatePickerDialog.<init>(DatePickerDialog.java:112)  
at android.app.DatePickerDialog.<init>(DatePickerDialog.java:82)  
at com.example.bisma.calendar_analyzer.ui.CreateEventActivity.onClick(CreateEventActivity.java:100)  
at android.view.View.performClick(View.java:5204)  
at android.view.View$PerformClick.run(View.java:21153)  
at android.os.Handler.handleCallback(Handler.java:739)  
at android.os.Handler.dispatchMessage(Handler.java:95)  
at android.os.Looper.loop(Looper.java:148)  
at android.app.ActivityThread.main(ActivityThread.java:5417)  
at java.lang.reflect.Method.invoke(Native Method)  
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)  
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)  
Caused by: android.content.res.Resources$NotFoundException: File res/color/mcv_text_date_dark.xml from drawable resource ID #0x7f0c006c 
at android.content.res.Resources.loadDrawableForCookie(Resources.java:2640) 
at android.content.res.Resources.loadDrawable(Resources.java:2540) 
at android.content.res.TypedArray.getDrawable(TypedArray.java:870) 
at android.widget.DatePickerCalendarDelegate.<init>(DatePickerCalendarDelegate.java:155) 
at android.widget.DatePicker.createCalendarUIDelegate(DatePicker.java:160) 
at android.widget.DatePicker.<init>(DatePicker.java:140) 
at android.widget.DatePicker.<init>(DatePicker.java:126) 
at android.widget.DatePicker.<init>(DatePicker.java:122) 
at java.lang.reflect.Constructor.newInstance(Native Method)  
at android.view.LayoutInflater.createView(LayoutInflater.java:619)  
at com.android.internal.policy.PhoneLayoutInflater.onCreateView(PhoneLayoutInflater.java:58)  
at android.view.LayoutInflater.onCreateView(LayoutInflater.java:694)  
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:762)  
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:704)  
at android.view.LayoutInflater.inflate(LayoutInflater.java:492)  
at android.view.LayoutInflater.inflate(LayoutInflater.java:423)  
at android.view.LayoutInflater.inflate(LayoutInflater.java:374)  
at android.app.DatePickerDialog.<init>(DatePickerDialog.java:112)  
at android.app.DatePickerDialog.<init>(DatePickerDialog.java:82)  
at com.example.bisma.calendar_analyzer.ui.CreateEventActivity.onClick(CreateEventActivity.java:100)  
at android.view.View.performClick(View.java:5204)  
at android.view.View$PerformClick.run(View.java:21153)  
at android.os.Handler.handleCallback(Handler.java:739)  
at android.os.Handler.dispatchMessage(Handler.java:95)  
at android.os.Looper.loop(Looper.java:148)  
at android.app.ActivityThread.main(ActivityThread.java:5417)  
at java.lang.reflect.Method.invoke(Native Method)  
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)  
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)  
Caused by: org.xmlpull.v1.XmlPullParserException: Binary XML file line #7: <item> tag requires a 'drawable' attribute or child tag defining a drawable 
at android.graphics.drawable.StateListDrawable.inflateChildElements(StateListDrawable.java:182) 
at android.graphics.drawable.StateListDrawable.inflate(StateListDrawable.java:115) 
at android.graphics.drawable.Drawable.createFromXmlInner(Drawable.java:1215) 
at android.graphics.drawable.Drawable.createFromXml(Drawable.java:1124) 
at android.content.res.Resources.loadDrawableForCookie(Resources.java:2630) 
at android.content.res.Resources.loadDrawable(Resources.java:2540)  
at android.content.res.TypedArray.getDrawable(TypedArray.java:870)  
at android.widget.DatePickerCalendarDelegate.<init>(DatePickerCalendarDelegate.java:155)  
at android.widget.DatePicker.createCalendarUIDelegate(DatePicker.java:160)  
at android.widget.DatePicker.<init>(DatePicker.java:140)  
at android.widget.DatePicker.<init>(DatePicker.java:126)  
at android.widget.DatePicker.<init>(DatePicker.java:122)  
at java.lang.reflect.Constructor.newInstance(Native Method)  
at android.view.LayoutInflater.createView(LayoutInflater.java:619)  
at com.android.internal.policy.PhoneLayoutInflater.onCreateView(PhoneLayoutInflater.java:58)  
at android.view.LayoutInflater.onCreateView(LayoutInflater.java:694)  
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:762)  
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:704)  
at android.view.LayoutInflater.inflate(LayoutInflater.java:492)  
at android.view.LayoutInflater.inflate(LayoutInflater.java:423)  
at android.view.LayoutInflater.inflate(LayoutInflater.java:374)  
at android.app.DatePickerDialog.<init>(DatePickerDialog.java:112)  
at android.app.DatePickerDialog.<init>(DatePickerDialog.java:82)  
at com.example.bisma.calendar_analyzer.ui.CreateEventActivity.onClick(CreateEventActivity.java:100)  
at android.view.View.performClick(View.java:5204)  
at android.view.View$PerformClick.run(View.java:21153)  
at android.os.Handler.handleCallback(Handler.java:739)  
at android.os.Handler.dispatchMessage(Handler.java:95)  
at android.os.Looper.loop(Looper.java:148)  
at android.app.ActivityThread.main(ActivityThread.java:5417)  
at java.lang.reflect.Method.invoke(Native Method)  
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726) 

これはJavaのクラスファイル

のTextView startDateEtで完全な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:layout_width="match_parent" 
android:layout_height="match_parent" 
android:padding="16dp" 
tools:context="com.example.bisma.calendar_analyzer.ui.CreateEventActivity"> 


<EditText 
    android:id="@+id/eventTitle_et" 
    android:layout_width="match_parent" 
    android:layout_height="wrap_content" 
    android:layout_marginTop="10dp" 
    android:hint="Event Title" /> 

<EditText 
    android:id="@+id/description_et" 
    android:layout_width="match_parent" 
    android:layout_height="wrap_content" 
    android:layout_below="@+id/eventTitle_et" 
    android:layout_marginTop="10dp" 
    android:hint="Description" /> 

<TextView 
    android:id="@+id/startDate_et" 
    android:layout_width="match_parent" 
    android:layout_height="wrap_content" 
    android:layout_below="@+id/description_et" 
    android:layout_marginTop="10dp" 
    android:background="@drawable/round_field" 
    android:hint="Start Date/Time" 
    android:padding="10dp" 
    android:textColor="@color/white" 
    android:textColorHint="@color/white" /> 

<TextView 
    android:id="@+id/endDate_et" 
    android:layout_width="match_parent" 
    android:layout_height="wrap_content" 
    android:layout_below="@+id/startDate_et" 
    android:layout_marginTop="10dp" 
    android:background="@drawable/round_field" 
    android:hint="End Date/Time" 
    android:padding="10dp" 
    android:textColor="@color/white" 
    android:textColorHint="@color/white" /> 

<Button 
    android:id="@+id/create_event_btn" 
    android:layout_width="match_parent" 
    android:layout_height="wrap_content" 
    android:layout_below="@+id/endDate_et" 
    android:layout_marginTop="10dp" 
    android:text="Create Event" /> 

Answer 1

1. です。

      @Override 
          protected void onCreate(Bundle savedInstanceState) { 
           super.onCreate(savedInstanceState); 
           setContentView(R.layout.activity_main); 
   
           startDateEt=(TextView) findViewById(R.id.startDate_et); 
           startDateEt.setOnClickListener(this); 
       }  
         @Override 
          public void onClick(View view) { 
           if (view.getId() == R.id.startDate_et) { 
            final java.util.Calendar c = java.util.Calendar.getInstance(); 
            int mYear = c.get(java.util.Calendar.YEAR); 
            int mMonth = c.get(java.util.Calendar.MONTH); 
            int mDay = c.get(java.util.Calendar.DAY_OF_MONTH); 
            DatePickerDialog datePickerDialog = new DatePickerDialog(this, 
              new DatePickerDialog.OnDateSetListener() { 
               @Override 
               public void onDateSet(DatePicker view, int year, int monthOfYear, int dayOfMonth) { 
                startDateEt.setText(dayOfMonth + "-" + (monthOfYear + 1) + "-" + year); 
               } 
              }, mYear, mMonth, mDay); 
            datePickerDialog.show(); 
           } 
          } 
   

2. これは、XMLファイル

<EditText 
      android:id="@+id/eventTitle_et" 
      android:layout_width="match_parent" 
      android:layout_height="wrap_content" 
      android:layout_marginTop="10dp" 
      android:hint="Event Title" /> 

    <EditText 
      android:id="@+id/description_et" 
      android:layout_width="match_parent" 
      android:layout_height="wrap_content" 
      android:layout_below="@+id/eventTitle_et" 
      android:layout_marginTop="10dp" 
      android:hint="Description" /> 

    <TextView 
      android:id="@+id/startDate_et" 
      android:layout_width="match_parent" 
      android:layout_height="wrap_content" 
      android:layout_below="@+id/description_et" 
      android:layout_marginTop="10dp" 
      android:hint="Start Date/Time" 
      android:padding="10dp" 

      /> 

    <TextView 
      android:id="@+id/endDate_et" 
      android:layout_width="match_parent" 
      android:layout_height="wrap_content" 
      android:layout_below="@+id/startDate_et" 
      android:layout_marginTop="10dp" 
      android:hint="End Date/Time" 
      android:padding="10dp" 
      /> 

    <Button 
      android:id="@+id/create_event_btn" 
      android:layout_width="match_parent" 
      android:layout_height="wrap_content" 
      android:layout_below="@+id/endDate_et" 
      android:layout_marginTop="10dp" 
      android:text="Create Event" /> 
    </RelativeLayout>