How to copy text programmatically in my Android app?

Use ClipboardManager#setPrimaryClip method:

import android.content.ClipboardManager;

// ...

ClipboardManager clipboard = (ClipboardManager) getSystemService(CLIPBOARD_SERVICE); 
ClipData clip = ClipData.newPlainText("label", "Text to copy");
clipboard.setPrimaryClip(clip);

ClipboardManager API reference

Googling brings you to android.content.ClipboardManager and you could decide, as I did, that Clipboard is not available on API < 11, because the documentation page says "Since: API Level 11".

There are actually two classes, second one extending the first - android.text.ClipboardManager and android.content.ClipboardManager.

android.text.ClipboardManager is existing since API 1, but it works only with text content.

android.content.ClipboardManager is the preferred way to work with clipboard, but it's not available on API Level < 11 (Honeycomb).

To get any of them you need the following code:

ClipboardManager clipboard = (ClipboardManager) getSystemService(CLIPBOARD_SERVICE);

But for API < 11 you have to import android.text.ClipboardManager and for API >= 11 android.content.ClipboardManager

ClipboardManager clipboard = (ClipboardManager) getSystemService(CLIPBOARD_SERVICE); 
ClipData clip = ClipData.newPlainText("label", "Text to copy");
if (clipboard == null || clip == null)
    return;
clipboard.setPrimaryClip(clip);

And import import android.content.ClipboardManager;

For Kotlin, we can use the following method. You can paste this method inside an activity or fragment.

fun copyToClipBoard(context: Context, message: String) {

    val clipBoard = context.getSystemService(Context.CLIPBOARD_SERVICE) as ClipboardManager
    val clipData = ClipData.newPlainText("label",message)
    clipBoard.setPrimaryClip(clipData)

}

For Kotlin use the below code inside the activity.

import android.content.ClipboardManager


 val clipBoard = getSystemService(Context.CLIPBOARD_SERVICE) as ClipboardManager
 val clipData = ClipData.newPlainText("label","Message to be Copied")
 clipBoard.setPrimaryClip(clipData)

Here is my working code

/**
 * Method to code text in clip board
 *
 * @param context context
 * @param text    text what wan to copy in clipboard
 * @param label   label what want to copied
 */
public static void copyCodeInClipBoard(Context context, String text, String label) {
    if (context != null) {
        ClipboardManager clipboard = (ClipboardManager) context.getSystemService(CLIPBOARD_SERVICE);
        ClipData clip = ClipData.newPlainText(label, text);
        if (clipboard == null || clip == null)
            return;
        clipboard.setPrimaryClip(clip);

    }
}

Or create a Kotlin extension

 fun String.copyToClipboard(context: Context) {
     val clipBoard = context.getSystemService(Context.CLIPBOARD_SERVICE) as ClipboardManager
     val clipData = ClipData.newPlainText("label",this)
     clipBoard.setPrimaryClip(clipData)
  }

and then call

"stringToCopy".copyToClipboard(requireContext())

Unless your app is the default input method editor (IME) or is the app that currently has focus, your app cannot access clipboard data on Android 10 or higher. https://developer.android.com/about/versions/10/privacy/changes#clipboard-data

I use this(work with fragments)- kotlinish way

  private fun copyTextToClipboard(copyText: String) {

        val clipboardManager = requireActivity().
                               getSystemService(CLIPBOARD_SERVICE) as 
                                       android.content.ClipboardManager

        val clipData = ClipData.newPlainText("userLabel" ,copyText.trim())

        clipboardManager.setPrimaryClip(clipData)

    }