Why Can't Android:onclick Recognize The Specfied Function?

Java Code:- package com.example.plannerv1; import androidx.appcompat.app.AppCompatActivity; import android.content.Intent; import android.database.sqlite.SQLiteDatabase; import

Solution 1:

You addanote() function must be public, not protected:

publicvoidaddanote(View v)

Docs: https://developer.android.com/guide/topics/ui/controls/button#java

Solution 2:

As @Marcin mentioned, you should use public instead of protected. Also, you can use a different but better approach, add a listener on the Button:

Add an id attribute to the Button, then define the listener in the onCreate() method. XML:

<Button
    android:id="addNote"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:padding="20sp"
    android:text="Add Note"/>

Then Java:

@OverrideprotectedvoidonCreate(Bundle savedInstanceState) {
    ...
    Button addNote = findViewById(R.id.addNote);
    addNote.setOnClickListner(newView.OnClickListener() {
        @OverridepublicvoidonClick() {
            //Your code to be implemented when button is clicked.
        }
    });
    ...
}

Solution 3:

You need to make the method public as mentioned here

https://developer.android.com/guide/topics/ui/controls/button#java

The method you declare in the android:onClick attribute must have a signature exactly as shown above. Specifically, the method must: Be public Return void Define a View as its only parameter (this will be the View that was clicked)

the code is working fine after making it public

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