대화 상자를 표시하는 방법을 호출 할 때 null 포인터 예외가 발생합니다.

Question

AmbilwarnaColorDialog를 사용하여 color를 선택했습니다. 따라서 Ambilwarna 라이브러리가 포함되었습니다. 이미지를 클릭하여 색상 대화 상자를 열려고합니다. 그래서 나는 단지 다음의 메서드를 호출한다. 하지만 그것은 나를 null 포인터 예외를 보여줍니다. 누구든지 나를 도울 수 있습니까? 내 코드 : 내 수입은

int color; 

void openDialog(boolean supportsAlpha) { 
    AmbilWarnaDialog dialog = new AmbilWarnaDialog(MainActivity.this, 
      color, supportsAlpha, 
      new AmbilWarnaDialog.OnAmbilWarnaListener() { 

       @Override 
       public void onOk(AmbilWarnaDialog dialog, int color) { 
        Toast.makeText(getApplicationContext(), "ok", 
          Toast.LENGTH_SHORT).show(); 
        MainActivity.this.color = color; 
       } 

       @Override 
       public void onCancel(AmbilWarnaDialog dialog) { 
        Toast.makeText(getApplicationContext(), "cancel", 
          Toast.LENGTH_SHORT).show(); 
       } 
      }); 
    dialog.show(); 
} 

입니다

:

import yuku.ambilwarna.AmbilWarnaDialog; 

로그 캣을 다음과 같이 표시됩니다 :

01-20 10:54:56.260: E/AndroidRuntime(14407): FATAL EXCEPTION: main 
01-20 10:54:56.260: E/AndroidRuntime(14407): java.lang.NullPointerException 
01-20 10:54:56.260: E/AndroidRuntime(14407): at yuku.ambilwarna.AmbilWarnaDialog.<init>(AmbilWarnaDialog.java:84) 
01-20 10:54:56.260: E/AndroidRuntime(14407): at com.example.demofordrawline.MainActivity.openDialog(MainActivity.java:178) 
01-20 10:54:56.260: E/AndroidRuntime(14407): at com.example.demofordrawline.MainActivity.onClick(MainActivity.java:251) 
01-20 10:54:56.260: E/AndroidRuntime(14407): at android.view.View.performClick(View.java:4212) 
01-20 10:54:56.260: E/AndroidRuntime(14407): at android.view.View$PerformClick.run(View.java:17476) 
01-20 10:54:56.260: E/AndroidRuntime(14407): at android.os.Handler.handleCallback(Handler.java:800) 
01-20 10:54:56.260: E/AndroidRuntime(14407): at android.os.Handler.dispatchMessage(Handler.java:100) 
01-20 10:54:56.260: E/AndroidRuntime(14407): at android.os.Looper.loop(Looper.java:194) 
01-20 10:54:56.260: E/AndroidRuntime(14407): at android.app.ActivityThread.main(ActivityThread.java:5371) 
01-20 10:54:56.260: E/AndroidRuntime(14407): at java.lang.reflect.Method.invokeNative(Native Method) 
01-20 10:54:56.260: E/AndroidRuntime(14407): at java.lang.reflect.Method.invoke(Method.java:525) 
01-20 10:54:56.260: E/AndroidRuntime(14407): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:833) 
01-20 10:54:56.260: E/AndroidRuntime(14407): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:600) 
01-20 10:54:56.260: E/AndroidRuntime(14407): at dalvik.system.NativeStart.main(Native Method) 

Answer 1

는 라인이 코드

 package yuku.ambilwarna.demo; 

    import yuku.ambilwarna.AmbilWarnaDialog; 
    import android.app.Activity; 
    import android.os.Bundle; 
    import android.view.View; 
    import android.widget.Button; 
    import android.widget.Toast; 

    public class AmbilWarnaDemoActivity extends Activity { 
     int color = 0xffffff00; 

     @Override 
     public void onCreate(Bundle savedInstanceState) { 
      super.onCreate(savedInstanceState); 
      setContentView(R.layout.main); 

      final Button button = (Button) findViewById(R.id.button1); 

      button.setOnClickListener(new View.OnClickListener() { 
       @Override 
       public void onClick(View v) { 
        openDialog(); 
       } 
      }); 
     } 

     void openDialog() { 
      AmbilWarnaDialog dialog = new AmbilWarnaDialog(
        AmbilWarnaDemoActivity.this, color, 
        new AmbilWarnaDialog.OnAmbilWarnaListener() { 
         @Override 
         public void onOk(AmbilWarnaDialog dialog, int color) { 

          AmbilWarnaDemoActivity.this.color = color; 
          Toast.makeText(getApplicationContext(), 
            "Color is " + color, Toast.LENGTH_SHORT).show(); 
         } 

         @Override 
         public void onCancel(AmbilWarnaDialog dialog) { 
          Toast.makeText(getApplicationContext(), "cancel", 
            Toast.LENGTH_SHORT).show(); 
         } 
        }); 
      dialog.show(); 
     } 
    }