Android Studio中的Android首选项设置错误

Question

我进行了一些设置活动。当我做出意图时，它发生了错误。它说 " java.lang.noclassdeffounderror：失败的分辨率：landroid/support/v7/v7/app/appcompatactivity; "

他们说" alt_logout.setposistivebutton（"是"，new DialogInterface.onclicklistener（）"此代码是问题的。我不知道我能做什么。P>

else if(preference.getKey().equals("logout")){
            AlertDialog.Builder alt_logout = new AlertDialog.Builder(activity);
            alt_logout.setMessage("Do You want to logout?");
        alt_logout.setPositiveButton("Yes", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int id) {
                        // Action for 'Yes' Button
                        Intent Logout = new Intent(SettingActivity.this, LoginActivity.class);
                        startActivity(Logout);
                    }
                });
        alt_logout.setNegativeButton("No", new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int id) {
                        // Action for 'NO' Button
                        dialog.cancel();
                    }
                });
        AlertDialog alert 
= alt_logout.create();
            // Title for Alet Dialog
        alert.setTitle("Logout");
        alert.show();
    }

Answer 1

更改

 AlertDialog.Builder alt_logout = new AlertDialog.Builder(activity);

to

 AlertDialog.Builder alt_logout = new AlertDialog.Builder(getApplicationContext());