IllegalStateException: Could not find method insert(View) in a parent or ancestor Context class android.support.v7.widget.AppCompatButton

Question

I have launched the program in single project which work properly.

However, when I have copied and pasted into a bigger project, it gives me bellow error in logcat.

Answer 1

I was facing this exact same issue. The issue was that I was calling a public method from the onClick in my xml layout. Inside that public method, I was calling another private method inside the same class.

I changed the class from private to public and it worked.

XML layout:

<Button
                android:layout_width="48dp"
                android:layout_height="48dp"
                android:onClick="increment"
                android:text="+" />

Class:

public void increment(View view){
    quantity = quantity + 1;
    display(quantity);
}

private void display(int number) {
    TextView quantityTextView = (TextView) findViewById(R.id.quantity_text_view);
    quantityTextView.setText("" + number);
}

I changed the display method from private to public and it worked.

Answer 2

I found the error.

In layout second_layout.xml, you defined Button with android:onClick="insert"

This layout is included in activity_user_profile.xml

This activity_user_profile.xml is used in Main2Activity.java

So, that is the issue:

"Insert Button" is being used in Main2Activity.java. However, that class does not have any method public void insert(View view)

So, add this to your Main2Activity.java:

public void insert(View view){
    // Add the code that you want
    // Or do nothing if you want
}

Rememeber

If you set any onClick event in a layout file (xml), you have to create the method in the parent activity that will use that layout.