Android偏好设置在Android Studio中的错误

Question

我做了一些设置Activity。当我制定意图时，发生了错误。它说的 “ java.lang.NoClassDefFoundError：失败的分辨率：Landroid /支持/ V7 /应用/ AppCompatActivity;”

，他们说： “alt_logout.setPositiveButton（” 是”，新DialogInterface.OnClickListener（ ）“这段代码是问题。我不知道我能做什么。帮助我..

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

变化

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

为

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