Android-java.lang.RuntimeException: Can't create handler inside thread that has not called Looper.prepare()
Android-java.lang.RuntimeException: Can't create handler inside thread that has not called Looper.prepare()
当我们在一个新的线程中使用android UI时，遇到这个异常
看了很多文章也还是不太清楚具体是什么原因，但是处理这个问题是很简单的，如下代码：
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@Overridepublic void run() { //前面代码省略 Looper.prepare(); Log.i("---my tag---", "下载完成："+downloadPath); Toast.makeText(context, fileName+"下载完成...", Toast.LENGTH_LONG).show(); Looper.loop(); } |
在使用Toast之前加一行Looper.prepare();，然后在Toast之后加一行Looper.loop();，即可实现。看了很多文章也没理解，所以这里就不误导大家了，感兴趣的自己搜搜原因。
上面代码是我自己写的文件下载功能一部分代码，完整代码可以查看：
Android-java.lang.RuntimeException: Can't create handler inside thread that has not called Looper.prepare()
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