获取自定义视图的ViewGroup（布局）

Question

I made a custom View, called ColorPicker. I create my ColorPicker in my xml.

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:id="@+id/linearlayout_settings">

    <visuals.customview.ColorPicker
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />
</LinearLayout>

In the ColorPicker's Constr i need a ref to my LinearLayout, but i can't find any answer here.

public ColorPicker(Context context, AttributeSet attrs) {
    super(context, attrs);

    //LinearLayout layout = ???;
}

I tried following solutions which i read on similar questions:

getParent();

returns null

getRootView();

returns the ColorPicker itself

findViewByID(R.id.linearlayout_settings);

returns null

Thank's in advance

Answer 1

The problem is that you're calling getParent() inside your View 's constructor, at that point the View has not been attached to the parent. If you want to get the parent and be sure it is not null, override your custom View 's protected void onAttachedToWindow()

public class ColorPicker extends View {

    public ColorPicker(Context context, AttributeSet attrs) {
        super(context, attrs);    
    }

    @Override
    protected void onAttachedToWindow() {
        super.onAttachedToWindow();    
        // call getParent() here
    }
}

Answer 2

Use The Color Dialog Box This Better For pick color on Activity colorDialog.setPickerColor(YourActivity.this, 2, color);

OR

<visuals.customview.ColorPicker
    android:layout_width="wrap_content"
    android:id="@+id/vis1"
    android:layout_height="wrap_content" />

Create Object in Java File find object in java file

Try it.