Benutzerdefinierte Spinner, Show Farbige Textviews

Question

ich eine Spinner machen wollen Farben zu wählen, und ich möchte jedes Element es sich um eine Kreisansicht mit etwas Farbe sein [Farben sind in Styles]

also stelle ich bin versucht zu Ihr individuelles Spinner Adapter

class CustomSpinnerAdapter extends ArrayAdapter<Integer> { 
    private Context mContext; 
    private Integer [] mColors; 
    public CustomSpinnerAdapter(Context context, int resource, Integer [] Colors) { 
     super(context, resource,Colors); 
     mContext=context; 
     mColors=Colors; 
    } 

    @Override 
    public View getDropDownView(int position, View convertView, ViewGroup parent) { 
     return getCustomView(position, convertView, parent); 
    } 



    public View getCustomView(int position, View convertView, ViewGroup parent) { 
     View row=convertView; 

     LayoutInflater inflater = ((Activity)mContext).getLayoutInflater(); 

     row=inflater.inflate(R.layout.color_spinner_row, parent, false); 
     TextView Circle = (TextView) row.findViewById(R.id.circle); 
     GradientDrawable bgShape = (GradientDrawable)Circle.getBackground(); 
     bgShape.setColor(mContext.getResources().getColor(mColors[position])); 
     return convertView; 
    } 
} 

und der OnCreate Code ist:

Integer colors[]={R.color.Class_Color1,R.color.Class_Color2,R.color.Class_Color3,R.color.Class_Color4,R.color.Class_Color5}; 
Spinner Colors_Spinner= (Spinner) findViewById(R.id.Colors_Spinner); 
CustomSpinnerAdapter customSpinnerAdapter = new CustomSpinnerAdapter(this, android.R.layout.simple_spinner_dropdown_item, colors); 
Colors_Spinner.setAdapter(customSpinnerAdapter); 

aber dieser Code wirft einen nullPointerExption

Also, wie das zu beheben?

bearbeiten, The Log Fehler:

FATAL EXCEPTION: main Process: com.example.atefhares.finalproject_build1, PID: 7309 
           java.lang.NullPointerException: Attempt to invoke virtual method 'android.view.ViewGroup$LayoutParams android.view.View.getLayoutParams()' on a null object reference 
           at android.support.v7.widget.AppCompatSpinner.compatMeasureContentWidth(AppCompatSpinner.java:561) 
           at android.support.v7.widget.AppCompatSpinner.access$500(AppCompatSpinner.java:64) 
           at android.support.v7.widget.AppCompatSpinner$DropdownPopup.computeContentWidth(AppCompatSpinner.java:751) 
           at android.support.v7.widget.AppCompatSpinner$DropdownPopup.show(AppCompatSpinner.java:776) 
           at android.support.v7.widget.AppCompatSpinner.performClick(AppCompatSpinner.java:434) 
           at android.view.View$PerformClick.run(View.java:19769) 
           at android.os.Handler.handleCallback(Handler.java:739) 
           at android.os.Handler.dispatchMessage(Handler.java:95) 
           at android.os.Looper.loop(Looper.java:135) 
           at android.app.ActivityThread.main(ActivityThread.java:5289) 
           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:899) 
           at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694) 

Answer 1

Ich denke convertView == null verursacht das Problem:

@Override 
public View getDropDownView(int position, View convertView,ViewGroup parent) { 
    return getCustomView(position, convertView, parent); 
} 

@Override 
public View getView(int position, View convertView, ViewGroup parent) { 
    return getCustomView(position, convertView, parent); 
} 

public View getCustomView(int position, View convertView, ViewGroup parent) { 
    Textview circle; 
    if (convertView == null) { 
     convertView = inflater.inflate(R.layout.color_spinner_row, parent, false); 
     circle = convertView.findViewById(R.id.circle); 
     convertView.setTag(circle); 
    } else { 
     circle = (TextView) convertView.getTag(); 
    } 
    // Do everything you want with "circle" 


    return convertView; 
}