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.

 FATAL EXCEPTION: main Process: com.example.alan.mainactivity, PID: 11545 java.lang.IllegalStateException: Could not find method insert(View) in a parent or ancestor Context for android:onClick attribute defined on view class android.support.v7.widget.AppCompatButton with id 'button' at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.resolveMethod(AppCompatViewInflater.java:307) at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:266)
  at android.view.View.performClick(View.java:5198)
  at android.view.View$PerformClick.run(View.java:21147)
 at android.os.Handler.handleCallback(Handler.java:739)
 at android.os.Handler.dispatchMessage(Handler.java:95)
  at android.os.Looper.loop(Looper.java:148)
 at android.app.ActivityThread.main(ActivityThread.java:5417)
 at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)

Answer 1

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.

Answer 2

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.