버튼 클릭시에 텍스트뷰가 사라져요... [closed]

Question

버튼 클릭 시 택스트뷰에 값을 변경하게끔 구현을 해놓았는데 그게 문제인건지 모르겠습니다.

처음 앱을 시작하면은 텍스트뷰는 출력이 되었있는데 버튼만 누르면 사라집니다.

로그켓에는 문제 없다고 뜨는데요 어떻게 해야될지 모르겠습니다.

?

public class Content_Main extends Fragment implements View.OnClickListener,SeekBar.OnSeekBarChangeListener {       private  int count;     private  int count1;     private  int progress;     ProgressBar mtimerbar = null;       Button hz_left;     Button hz_right;       TextView mtimebar;     TextView mhztext;       TextView mtextview;       ArcSeekBar arcSeekBar;     //int       String readMessage = null;      @Nullable     @Override     public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {         View RootView = inflater.inflate(R.layout.content_main, container, false);                  return RootView;     }       protected void initView(View root) {           IndicatorSeekBar tick_drawable = root.findViewById(R.id.seekBar);         tick_drawable.setTickMarksDrawable(getResources().getDrawable(R.mipmap.ic_launcher));       }       @Override     public void onActivityCreated(@Nullable Bundle savedInstanceState) {          super.onActivityCreated(savedInstanceState);           setUIControl();           if(ContextCompat.checkSelfPermission(getActivity(), Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED)             ActivityCompat.requestPermissions(getActivity(), new String[]{Manifest.permission.ACCESS_COARSE_LOCATION}, 1);       }       private void doDiscovery() {     }       @Override     public void onAttach(Context context) {           super.onAttach(context);                   }       @Override     public void onDetach() {                          super.onDetach();           Log.d("Content_Main","Content_Main onDetach");     }       @Override     public void onResume() {                          super.onResume();          if(flagBindService == false) {             getActivity().bindService(new Intent(getActivity(), ServiceBluetooth.class), connection, Service.BIND_AUTO_CREATE);         }     }       @Override     public void onStop() {                              super.onStop();           if(flagBindService){             flagBindService = false;             try{                 getActivity().unbindService(connection);             }catch (Exception e){                 e.printStackTrace();             }         }       }       /**      * UI 생성 및 세팅      */       private void setUIControl(){           mBluetoothStatus = (TextView)getView().findViewById(R.id.bluetoothStatus);           mhztext = (TextView)getView().findViewById(R.id.hztext);         mtimebar = (TextView)getView().findViewById(R.id.timebar);                     hz_left=(Button)getView().findViewById(R.id.hz_left);         hz_left.setOnClickListener(this);         hz_right=(Button)getView().findViewById(R.id.hz_right);         hz_right.setOnClickListener(this);           arcSeekBar = (ArcSeekBar)getView().findViewById(R.id.seekArc);         int[] colorArrays = getResources().getIntArray(R.array.gradinet);         arcSeekBar.setProgressGradient(colorArrays);         arcSeekBar.setOnProgressChangedListener(new ProgressListener() {             @Override             public void invoke(int i) {                 if(progress >0)  {                     progress--;                 }                 Log.d("Content_Main","sendMessage : "+message);                 mhztext.setText(String.valueOf(progress));                 message = "m";                 if(message != null && message.length() > 0)                     sendMessage(message);             }         });     }       private void bluetoothOn(View view){     }       private void bluetoothOff(View view){     }       // Enter here after user selects "yes" or "no" to enabling radio     @Override     public void onActivityResult(int requestCode, int resultCode, Intent Data){         // 응답 요청 확인         if (requestCode == REQUEST_ENABLE_BT) {             // 요청 성공 확인             if (resultCode == RESULT_OK) {                 // The user picked a contact.                 // The Intent's data Uri identifies which contact was selected.                 mBluetoothStatus.setText("Enabled");             }             else                 mBluetoothStatus.setText("Disabled");         }     }     @Override     public void onClick(View v) {         Log.d("Content_Main","onClick:"+v.getId());         switch(v.getId()) {         //  -1         case R.id.hz_left:           if(count>0){              count--;           }           mhztext.setText(""+count);             message = "k";             if(message != null && message.length() > 0)                 sendMessage(message);             Log.d("Content_Main","sendMessage : "+message);             break;           // +1         case R.id.hz_right:            if(count<99){                count++;            }            Log.d("Content_Main","sendMessage : "+message);            mhztext.setText(""+count);            message = "j";             if(message != null && message.length() > 0)                 sendMessage(message);              break;         default:            break;         }       }       private void sendMessage(String message) {           Log.d("Content_Main","sendMessage : "+message);         Log.d("Content_Main","sendMessage : "+message);           if(TextUtils.isEmpty(message)){             return;         }           if(flagBindService && service != null){             Log.d("Content_Main", "sendMessage to service");             service.CF_sendMessage(message.getBytes());               mtimebar.setText("");;             mhztext.setText("");;         }     }       void OnServiceConnected() {       }       void OnBluetoothConnected() {         ConnectionInfo tmp_info = ConnectionInfo.getInstance(getActivity());         mBluetoothStatus.setText("Connected "+tmp_info.getDeviceName());     }       void OnBluetoothDisconnected() {         mBluetoothStatus.setText("Connection failed");     }       void OnBluetoothMessage(String p_received) {/*           Log.d("Content_Main","Content_Main received : "+p_received );           readMessage = p_received;           if((readMessage.indexOf("s") == 0) && (readMessage.indexOf("j") == 1)&& (readMessage.indexOf("e") == 2)){             boolean flag = false;             if(readMessage != null);{                 if(count<99){                     count++;             }                 else if(readMessage == null);               }         }         if((readMessage.indexOf("s") == 0) && (readMessage.indexOf("k") == 1)&& (readMessage.indexOf("e") == 2)){             if(readMessage != null);{                 if(count>0){                     count--;                   }                 else if(readMessage == null);             }         }*/       }       void OnBluetoothOn() {       }       void OnBluetoothOff() {       } }

 

 

Answer 1

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textView.setText("");

이런 코드 때문에 사실은 있지만, 텍스트뷰에 글자가 없어서 안 보여서 없다고 생각할 수 있습니다. 

너비를 고정값으로 주고 배경색을 표시해서 실제로 없어지는지 확인해보세요.

Comments

백그라운드로 흰색을 주고 글자색을 검은색을 주었을때에 글자만 사라집니다.
버튼클릭시 텍스트에 숫자가 증가하도록 했는데 어디서 수정을 해야될까요?

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레이아웃은 다음과 같습니다.
<?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:id="@+id/content_main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@drawable/background"
    app:layout_behavior="@string/appbar_scrolling_view_behavior"
    tools:context=".Activity_Main">

    <!-- Hz -->
    <TextView
        android:id="@+id/hztext"
        android:layout_width="40dp"
        android:layout_height="44dp"
        android:layout_marginBottom="1dp"
        android:gravity="center"
        android:text="@string/testtext"
        android:textColor="#000000"
        android:background="#ffffff"
        android:textSize="35sp"
        app:layout_constraintBottom_toBottomOf="@+id/imageView"
        app:layout_constraintEnd_toStartOf="@+id/hz_right"
        app:layout_constraintStart_toEndOf="@+id/hz_left"
        app:layout_constraintTop_toTopOf="parent" />

    <!-- Hz down 버튼 -->
    <Button
        android:id="@+id/hz_left"
        android:layout_width="25dp"
        android:layout_height="40dp"
        android:layout_marginLeft="52dp"
        android:layout_marginStart="52dp"
        android:background="@drawable/arrow_left_black"
        android:contentDescription="@string/todo"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <!-- Hz up 버튼 -->
    <Button
        android:id="@+id/hz_right"
        android:layout_width="25dp"
        android:layout_height="40dp"
        android:background="@drawable/arrow_right_black"
        android:contentDescription="@string/todo"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintStart_toEndOf="@+id/hztext"
        app:layout_constraintTop_toTopOf="parent" />

</android.support.constraint.ConstraintLayout>

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@drawable/background 는 무슨 색인가요?

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@drawable/background 검은색 계열의 색입니다.

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mtimebar, mhztext 둘 다 사라지나요?
ConstraintLayout를 LinearLayout으로 바꿔서 하면 어떤가요?