How to Programmatically Add Views to Views

by

Calling addView is the correct answer, but you need to do a little more than that to get it to work.

If you create a View via a constructor (e.g., Button myButton = new Button();), you’ll need to call setLayoutParams on the newly constructed view, passing in an instance of the parent view’s LayoutParams inner class, before you add your newly constructed child to the parent view.

For example, you might have the following code in your onCreate() function assuming your LinearLayout has id R.id.main:

LinearLayout myLayout = findViewById(R.id.main);

Button myButton = new Button(this);
myButton.setLayoutParams(new LinearLayout.LayoutParams(
                                     LinearLayout.LayoutParams.MATCH_PARENT,
                                     LinearLayout.LayoutParams.MATCH_PARENT));

myLayout.addView(myButton);

Making sure to set the LayoutParams is important. Every view needs at least a layout_width and a layout_height parameter. Also getting the right inner class is important. I struggled with getting Views added to a TableRow to display properly until I figured out that I wasn’t passing an instance of TableRow.LayoutParams to the child view’s setLayoutParams.

More Related Contents:

  1. How to change the activity background from fragment inside it [closed]
  2. How to check visibility of software keyboard in Android?
  3. Running Google Maps v2 on the Android emulator
  4. Android – Cancel AsyncTask Forcefully
  5. Bad class file magic or version
  6. Android CI build: Could not find aapt2-proto.jar
  7. How to resolve “Waiting for Debugger” message?
  8. Passing String array between two class in android application
  9. Take Screenshot of SurfaceView
  10. Android vector drawable app:srcCompat not showing images
  11. Firebase cloud messaging notification not received by device
  12. unable to execute adb in Ubuntu. Downloaded file is meant for x86-64 while I have i686 [duplicate]
  13. Android crash when app is closed and reopened
  14. Webview in Scrollview
  15. Wallpaper not properly fit on device screen
  16. SQLite returned an error code of 14
  17. EditText underline below text property
  18. Android: change default Home Application
  19. Android – Save images in an specific folder
  20. How to convert UTC timestamp to device local time in android
  21. Firebase doesn’t work on Android Studio Emulator
  22. OpenCv with Android studio 1.3+ using new gradle – undefined reference
  23. package R does not exist
  24. Gradle warning: variant.getOutputFile() and variant.setOutputFile() are deprecated
  25. How to show the text on a ImageButton?
  26. setVisibility(GONE) view becomes invisible but still occupies space
  27. Bad notification posted – Couldn’t expand RemoteViews for: StatusBarNotification
  28. Android ViewPager automatically change page
  29. how to close android app completely
  30. How mdpi, hdpi, xhdpi folder works?

Leave a Comment