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手动临摹书写汉字怎么实现的，能否给个demo，谢谢

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手动临摹书写汉字怎么实现的，能否给个demo，谢谢！

java.lang.NullPointerException: Attempt to invoke virtual method 'com.lzy.okgo.request.base.Request com.lzy.okgo.request.base.Request.headers(java.lang.String, java.lang.String)' on a null object reference at com.lzy.okserver.download.DownloadTask.run(DownloadTask.java:235) at com.lzy.okserver.task.PriorityRunnable.run(PriorityRunnable.java:35) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1162) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:636) at java.lang.Thread.run(Thread.java:764) AndroidRuntime: FATAL EXCEPTION: pool-1-thread-1 部分平板报错空指针，有解决办法吗

左右多滑动几次，item排列就乱了