How to Prompt Users to Save Changes When Back Button Is Pressed in Android

How can I prompt users to save their changes when they press the back button in an Android application?

@Override
public void onBackPressed() {
    new AlertDialog.Builder(this)
        .setTitle("Unsaved Changes")
        .setMessage("You have unsaved changes. Do you want to continue without saving?")
        .setPositiveButton("Yes", new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog, int which) {
                // If user wants to discard changes
                MyActivity.super.onBackPressed();
            }
        })
        .setNegativeButton("No", null)
        .show();
}

In Android development, it's important to ensure that users don't lose their unsaved work when they navigate away from a screen. One effective way to do this is by overriding the `onBackPressed()` method to show a confirmation dialog when the back button is pressed.

@Override
public void onBackPressed() {
    new AlertDialog.Builder(this)
        .setTitle("Unsaved Changes")
        .setMessage("You have unsaved changes. Do you want to continue without saving?")
        .setPositiveButton("Yes", new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog, int which) {
                // If user wants to discard changes
                MyActivity.super.onBackPressed();
            }
        })
        .setNegativeButton("No", null)
        .show();

Causes

• The user might inadvertently lose unsaved changes if they accidentally press the back button.
• Different screens might have varying data entry forms that require user confirmation.

Solutions

• Override the `onBackPressed()` method in your activity to display a dialog.
• Use an `AlertDialog` to prompt users with 'Save Changes?' options when they attempt to leave the screen.

Mistake: Not checking if there are unsaved changes before showing the dialog.

Solution: Always check whether the user has entered any data that needs to be saved.

Mistake: Forgetting to call `super.onBackPressed()` when the user confirms leaving without saving.

Solution: Ensure that you call `super.onBackPressed()` to maintain the back navigation functionality.