フローティングボタンのヌルポインタ

Question

電話ダイヤルのフローティングアクションボタンを作成しました。アプリを実行しようとしましたが、私のfabコールでエラーが発生しました。 浮動アクションボタンで何が問題になったのか分かりません。 修正方法を教えていただけますか？

ここでは私のファブコード

FloatingActionButton fabshare = (FloatingActionButton) findViewById(fab); 
       FloatingActionButton fabcall = (FloatingActionButton) findViewById(fab); 

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

         Intent i = new Intent(Intent.ACTION_SEND); 
         i.setType("text/plain"); 
         String shareSubject = String.valueOf(dataLaundry.getNama()); 
         String shareBody = String.valueOf(dataLaundry.getAlamat()); 
         i.putExtra(Intent.EXTRA_SUBJECT, "Laundrize - " + shareSubject); 
         i.putExtra(Intent.EXTRA_TEXT, shareSubject + "\n" + shareBody + "\n\n" + 
            "http://maps.google.com/?q=" 
         + alamat.getText().toString().toLowerCase().replaceAll(" ","+")); 
         startActivity(Intent.createChooser(i, "Share via")); 


        } 
       }); 
       fabcall.setOnClickListener(new View.OnClickListener() { 
        @Override 
        public void onClick(View view) { 
         Intent callIntent = new Intent (Intent.ACTION_DIAL, Uri.parse("tel:"+ noTelp)); 
         startActivity(callIntent); 
               } 
              });\ 

、ここでエラー

FATAL EXCEPTION: main 
                      Process: com.example.rizkafs.laundrize, PID: 25885 
                      java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.rizkafs.laundrize/com.example.rizkafs.laundrize.DetailsActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.support.design.widget.FloatingActionButton.setOnClickListener(android.view.View$OnClickListener)' on a null object reference 
                       at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2660) 
                       at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2730) 
                       at android.app.ActivityThread.access$800(ActivityThread.java:185) 
                       at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1567) 
                       at android.os.Handler.dispatchMessage(Handler.java:111) 
                       at android.os.Looper.loop(Looper.java:194) 
                       at android.app.ActivityThread.main(ActivityThread.java:5847) 
                       at java.lang.reflect.Method.invoke(Native Method) 
                       at java.lang.reflect.Method.invoke(Method.java:372) 
                       at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1010) 
                       at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:805) 
                      Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.support.design.widget.FloatingActionButton.setOnClickListener(android.view.View$OnClickListener)' on a null object reference 
                       at com.example.rizkafs.laundrize.DetailsActivity.onCreate(DetailsActivity.java:46) 
                       at android.app.Activity.performCreate(Activity.java:6117) 
                       at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1123) 
                       at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2613) 
                       at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2730)  
                       at android.app.ActivityThread.access$800(ActivityThread.java:185)  
                       at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1567)  
                       at android.os.Handler.dispatchMessage(Handler.java:111)  
                       at android.os.Looper.loop(Looper.java:194)  
                       at android.app.ActivityThread.main(ActivityThread.java:5847)  
                       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:1010)  
                       at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:805)  

Answer 1

は活動の両方のFabアイコンのIDを定義しています。

FloatingActionButton fabshare = (FloatingActionButton) findViewById(R.id.fabshare); 
FloatingActionButton fabcall = (FloatingActionButton) findViewById(R.id.fabcall);