我试图使用的Class.forName（）方法，我的文件只是名字。

在我的情况下，它是MainActivity但是，当我尝试使用它在try catch块就找不到类与MainActivity的名字，当我调试，我发现

MainActivity.class.getName（）给我的 com.example.test.secondproject.MainActivity

所以我用它作为我的参数的Class.forName（com.example.test.secondproject.MainActivity）和它的工作就好了，

如何才能使其与刚刚的Class.forName（MainActivity）的工作，或者是预期的行为

 尝试{
            Log.i（TAG，试主要活动）; showNotification（背景下，intent.getStringExtra（信息）的toString（）的Class.forName（MainActivity））;


        }赶上（ClassNotFoundException异常E）{
            Log.i（TAG，尝试失败的错误：+ E）;

        }
 

这是错误：抛出java.lang.ClassNotFoundException：MainActivity

showNotification;

 公共静态无效showNotification（上下文的背景下，字符串消息，final类ActivityToOpen）{
        PendingIntent contentIntent = PendingIntent.getActivity（上下文，0，
                新意图（上下文，ActivityToOpen），0）;



        NotificationCompat.Builder mBuilder =
                新NotificationCompat.Builder（上下文）
                        .setSmallIcon（R.drawable.ic_launcher）
                        .setContentTitle（我的通知）
                        .setContentText（消息）;
        mBuilder.setContentIntent（co​​ntentIntent）;
        mBuilder.setDefaults（Notification.DEFAULT_SOUND）;
        mBuilder.setAutoCancel（真正的）;
        NotificationManager mNotificationManager =
                （NotificationManager）context.getSystemService（Context.NOTIFICATION_SERVICE）;
        mNotificationManager.notify（1，mBuilder.build（））;

    }
 

解决方案

如果您正在使用的所有类相同的包，那么你可以设置为常数，并追加到类。否则，你就需要指定全包的名称。

I'm trying to use Class.forName() method with just the name of my file.

In my case it's "MainActivity" But when I try to use it in a try catch block it cant find the Class with name of MainActivity, when i debugged, i found out that

MainActivity.class.getName() gives me com.example.test.secondproject.MainActivity

so i used it as my argument in Class.forName("com.example.test.secondproject.MainActivity") and it worked just fine,

how can I make it work with just Class.forName("MainActivity"), or is it an expected behavior

  try {
            Log.i(TAG,"try main activity ");            showNotification(context,intent.getStringExtra("message").toString(),Class.forName("MainActivity"));


        } catch (ClassNotFoundException e) {
            Log.i(TAG,"try fail error: "+ e);

        }

this is the error: java.lang.ClassNotFoundException: MainActivity

showNotification;

 public static void  showNotification(Context context,String message,final Class ActivityToOpen) {
        PendingIntent contentIntent = PendingIntent.getActivity(context, 0,
                new Intent(context, ActivityToOpen), 0);



        NotificationCompat.Builder mBuilder =
                new NotificationCompat.Builder(context)
                        .setSmallIcon(R.drawable.ic_launcher)
                        .setContentTitle("My notification")
                        .setContentText(message);
        mBuilder.setContentIntent(contentIntent);
        mBuilder.setDefaults(Notification.DEFAULT_SOUND);
        mBuilder.setAutoCancel(true);
        NotificationManager mNotificationManager =
                (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);
        mNotificationManager.notify(1, mBuilder.build());

    }

If you are using the same package for all classes then you can set that as a constant and append to your class. Otherwise you will need to specify the whole package name.