android - How to get the absolute coordinates of a view

Android - How to get the absolute coordinates of a view

To get the absolute coordinates of a view in Android, you can use the getLocationOnScreen() or getLocationInWindow() methods. Here's how to do it:

Using getLocationOnScreen()

This method retrieves the location of the view in relation to the entire screen.

import android.os.Bundle; import android.view.View; import android.widget.Button; import androidx.appcompat.app.AppCompatActivity; public class MainActivity extends AppCompatActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); Button button = findViewById(R.id.my_button); // Get absolute coordinates when the button is clicked button.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { int[] location = new int[2]; button.getLocationOnScreen(location); int x = location[0]; int y = location[1]; // Now x and y contain the absolute coordinates of the view // Use them as needed System.out.println("Absolute coordinates: X = " + x + ", Y = " + y); } }); } }

Using getLocationInWindow()

This method retrieves the location of the view in relation to the current window.

button.getLocationInWindow(location);

Summary

  • Use getLocationOnScreen(int[] location) to get absolute screen coordinates.
  • Use getLocationInWindow(int[] location) for coordinates relative to the current window.
  • Call these methods after the view has been laid out (e.g., in response to a user action).

This approach allows you to accurately obtain the position of any view in your Android layout.

Examples

  1. How to get absolute coordinates of a View in Android?

    • Description: Use the getLocationOnScreen method to retrieve the absolute coordinates of a view relative to the entire screen.
    • Code:
      int[] location = new int[2]; myView.getLocationOnScreen(location); int x = location[0]; int y = location[1];

  2. How to find the coordinates of a View relative to its parent?

    • Description: Use the getLocationInWindow method to get coordinates relative to the window.
    • Code:
      int[] location = new int[2]; myView.getLocationInWindow(location); int x = location[0]; int y = location[1];

  3. How to get the position of a View after layout?

    • Description: Use the ViewTreeObserver to listen for layout changes and get coordinates after the layout is complete.
    • Code:
      myView.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() { @Override public void onGlobalLayout() { int[] location = new int[2]; myView.getLocationOnScreen(location); // Remove listener to avoid repeated calls myView.getViewTreeObserver().removeOnGlobalLayoutListener(this); } });

  4. How to get coordinates of a View in a RecyclerView item?

    • Description: Use the getChildAdapterPosition method to get the position of a child view within a RecyclerView.
    • Code:
      View childView = recyclerView.getChildAt(0); // Example for the first item int[] location = new int[2]; childView.getLocationOnScreen(location);

  5. How to calculate the center coordinates of a View?

    • Description: Use the view��s dimensions along with its location to find the center point.
    • Code:
      int[] location = new int[2]; myView.getLocationOnScreen(location); int centerX = location[0] + myView.getWidth() / 2; int centerY = location[1] + myView.getHeight() / 2;

  6. How to get coordinates of a View in a Fragment?

    • Description: Use the getView() method to get the fragment's root view and then call getLocationOnScreen.
    • Code:
      View rootView = getView(); int[] location = new int[2]; rootView.findViewById(R.id.my_view).getLocationOnScreen(location);

  7. How to track View coordinates during animations?

    • Description: Use an animation listener to get the coordinates of the view during an animation.
    • Code:
      myView.animate().setListener(new AnimatorListenerAdapter() { @Override public void onAnimationEnd(Animator animation) { int[] location = new int[2]; myView.getLocationOnScreen(location); } });

  8. How to convert touch coordinates to View coordinates?

    • Description: Use the getGlobalVisibleRect method to convert touch coordinates relative to a view.
    • Code:
      myView.setOnTouchListener((v, event) -> { int[] location = new int[2]; myView.getLocationOnScreen(location); float touchX = event.getRawX() - location[0]; float touchY = event.getRawY() - location[1]; return true; });

  9. How to get the coordinates of a View during onCreate?

    • Description: Use post() method to ensure the view has been laid out before getting its coordinates.
    • Code:
      myView.post(() -> { int[] location = new int[2]; myView.getLocationOnScreen(location); });

  10. How to get the coordinates of a View in a custom layout?

    • Description: Override onLayout in a custom view to get the coordinates of child views.
    • Code:
      @Override protected void onLayout(boolean changed, int l, int t, int r, int b) { super.onLayout(changed, l, t, r, b); int[] location = new int[2]; myChildView.getLocationOnScreen(location); }

More Tags

react-native-swiper jsonconvert fbx videochat prediction sprite todataurl connector ubuntu sonar-runner

More Programming Questions

More Dog Calculators

More Weather Calculators

More Date and Time Calculators

More Electrochemistry Calculators