👀 Views: 93 💬 Answers: 1 📅 Created: 2025-06-12

android constraintlayout customview java

Hey everyone, I'm running into an issue that's driving me crazy. I'm facing an issue with a custom view that I've implemented, which is supposed to resize based on the constraints set in a ConstraintLayout. However, the view seems to ignore the dimensions specified in the XML layout, and instead, it maintains its original size regardless of the constraints, leading to layout overflow and clipping. The custom view is a simple drawing component that extends View and overrides the onSizeChanged and onDraw methods. Here's the XML layout for my activity: ```xml <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" android:layout_width="match_parent" android:layout_height="match_parent"> <com.example.CustomView android:id="@+id/customView" android:layout_width="0dp" android:layout_height="0dp" app:layout_constraintTop_toTopOf="parent" app:layout_constraintBottom_toBottomOf="parent" app:layout_constraintStart_toStartOf="parent" app:layout_constraintEnd_toEndOf="parent" /> </androidx.constraintlayout.widget.ConstraintLayout> ``` In the custom view's code, I'm trying to set the size based on the dimensions passed in the `onSizeChanged` method: ```java @Override protected void onSizeChanged(int w, int h, int oldw, int oldh) { super.onSizeChanged(w, h, oldw, oldh); // Perform drawing calculations based on new size } ``` Despite this, the view always seems to retain the size defined in its constructor. I've verified that the constraints are properly applied in the layout inspector, but they still don't seem to affect the custom view's size. I've also tried updating the view size manually using `setLayoutParams`, but that did not yield any changes either. Additionally, I am using Android Studio Arctic Fox (2020.3.1) and testing on an emulator with Android 13. I also cleared the build cache and rebuilt the project, but the issue persists. Any insights on why my custom view might not be responding to the constraints would be greatly appreciated. What's the best practice here?