NullPointerException in findNearestByColor

[uname]

java.lang.NullPointerException
at com.flask.colorpicker.ColorPickerView.findNearestByColor(ColorPickerView.java:266)
at com.flask.colorpicker.ColorPickerView.onWindowFocusChanged(ColorPickerView.java:123)
at android.view.View.dispatchWindowFocusChanged(View.java:7900)
at android.view.ViewGroup.dispatchWindowFocusChanged(ViewGroup.java:972)
at android.view.ViewGroup.dispatchWindowFocusChanged(ViewGroup.java:972)
at android.view.ViewGroup.dispatchWindowFocusChanged(ViewGroup.java:972)
at android.view.ViewGroup.dispatchWindowFocusChanged(ViewGroup.java:972)
at android.view.ViewGroup.dispatchWindowFocusChanged(ViewGroup.java:972)
at android.view.ViewGroup.dispatchWindowFocusChanged(ViewGroup.java:972)
at android.view.ViewRootImpl$ViewRootHandler.handleMessage(ViewRootImpl.java:3133)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5001)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601)
at dalvik.system.NativeStart.main(Native Method)

[ghost]

The problem is that this.renderer.initWith(colorWheelRenderOption) in ColorPickerView is not called and colorCircleList is therefore null. The reason for this is that onWindowFocusChanged which updates the color wheel is not called( e.g. the colorpicker is in a fragment and the fragment is replaced). One workaround that seems to work is:

 ViewTreeObserver vto = colorPickerView.getViewTreeObserver();
        vto.addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
            @Override
            public void onGlobalLayout() {
                colorPickerView.onWindowFocusChanged(true);
                ViewTreeObserver obs = colorPickerView.getViewTreeObserver();
                obs.removeGlobalOnLayoutListener(this);
            }
        });

[riddhishah1989]

Where I need to apply this code?

I have applied to my Fragment and as well as ColorPickerView.
But still it is giving me same error

at com.flask.colorpicker.ColorPickerView.findNearestByColor(ColorPickerView.java:281)
at com.flask.colorpicker.ColorPickerView.onWindowFocusChanged(ColorPickerView.java:138)

[ghost]

Calling it in onStart() in a Fragment worked for me.

[riddhishah1989]

I am not showing that color picker in Alert Dialog. I am loading that view to my Linear layout. will it work fine with it ?
Here below is my code

public ColorPickerDemo(Context context, LinearLayout layout) {
Log.e("ColorPickerDemo", "ColorPickerDemo()");
mContext = context;
builder = new AlertDialog.Builder(context);
pickerContainer = new LinearLayout(context);
pickerContainer.setOrientation(LinearLayout.VERTICAL);
pickerContainer.setGravity(Gravity.CENTER_HORIZONTAL);
defaultMargin = getDimensionAsPx(context, R.dimen.default_slider_margin);
layoutParamsForColorPickerView = new LinearLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, 0);
layoutParamsForColorPickerView.weight = 1;
colorPickerView = new ColorPickerView(context);
wheelType(ColorPickerView.WHEEL_TYPE.CIRCLE);
initialColor(mContext.getResources().getColor(android.R.color.darker_gray));
density(12);
showAlphaSlider(false);
showLightnessSlider(true);
lightnessSliderOnly();
setup();
layout.addView(pickerContainer);

}

[Freshman585]

@fxlex Thanks! I has already resolve my problem !