获取当前运行的Activity信息

new Thread(new Runnable() {
    @Override
    public void run() {

        while(true){
            try {
                Thread.sleep(1000);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            ActivityManager manager = (ActivityManager) getSystemService(Context.ACTIVITY_SERVICE);
            ActivityManager.RunningTaskInfo info = manager.getRunningTasks(1).get(0);
            String shortClassName = info.topActivity.getShortClassName();    //类名
            String className = info.topActivity.getClassName();              //完整类名
            String packageName = info.topActivity.getPackageName();          //包名
            Log.e("class",className+packageName+shortClassName);
        }

    }
}).start();