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<resources>
<declare-styleable name="CustomView">
<attr name="customAttribute1" format="reference" />
<attr name="customAttribute2" format="boolean" />
<attr name="customAttribute3" format="string" />
</declare-styleable>
</resources>

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<com.example.CustomView
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:customAttribute1="@drawable/icon"
app:customAttribute2="true"
app:customAttribute3="Hello World" />

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public class CustomView extends View {
public CustomView(Context context, AttributeSet attrs) {
super(context, attrs);
TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.CustomView);
Drawable customAttribute1 = a.getDrawable(R.styleable.CustomView_customAttribute1);
boolean customAttribute2 = a.getBoolean(R.styleable.CustomView_customAttribute2, false);
String customAttribute3 = a.getString(R.styleable.CustomView_customAttribute3);
a.recycle();
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}
}

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