在“活动”中单击“后退”按钮时，Android Studio运行命令

Question

This back button are added automatically on ActionBar

I want button to run the command below instead.

if (mWebView.canGoBack()) 
{
    mWebView.goBack();    
}
else
{
    super.onBackPressed();
}

The button is automatically added I didn't use any command I don't know where to place my command can anyone help me?

Answer 1

Try this,

    toolbar.setNavigationOnClickListener(new View.OnClickListener() 
    {
        @Override
        public void onClick(View v) 
        {
            if (mWebView.canGoBack()) 
            {
                mWebView.goBack();    
            }
            else
            {
                super.onBackPressed();
            }
        }
    });

Answer 2

try this,

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()) {
            case android.R.id.home:
                // todo: goto back activity from here

                if (mWebView.canGoBack()) 
                {
                    mWebView.goBack();    
                }
                else
                {
                    super.onBackPressed();
                }
                return true;

            default:
                return super.onOptionsItemSelected(item);
        }
    }