Can‘t create handler inside thread Thread*** that has not called Looper.prepare()

朴灿烈づ我的快乐病毒、 2024-02-20 11:43 9阅读 0赞

> java.lang.RuntimeException: Can't create handler inside thread Thread\[cached-pool-1-thread-0,5,main\] that has not called Looper.prepare()

原因是在非主线程启动Handler。比如在一个普通的Java的Thread里面，创建一个Handler。解决方法是用Looper.prepare() 和 Looper.loop() 把new Handler(）包起来。

Looper.prepare();
            mHandler = new MyHandler();
            Looper.loop();

[Android Handler，Looper，Message\_zhangphil looper-CSDN博客文章浏览阅读1.6k次。做一个简单的关于Handler，Looper，Message的小演示，代码主界面一个Button按钮，点击发送消息（累计）给线程的Looper循环，然后在LogCat中打印出来：package zhangphil.looper;import android.os.Bundle;import android.os.Handler;import android.os.Looper;imp\_zhangphil looper![favicon32.ico][]https://blog.csdn.net/zhangphil/article/details/43878993][Android Handler_Looper_Message_zhangphil looper-CSDN_1.6k_Handler_Looper_Message_Button_Looper_LogCat_package zhangphil.looper_import android.os.Bundle_import android.os.Handler_import android.os.Looper_imp_zhangphil looper_favicon32.ico_https_blog.csdn.net_zhangphil_article_details_43878993][Android非UI主线程中，若干普通Java线程使用Handler发送接收消息\_java handler 非主线程-CSDN博客文章浏览阅读1.4k次。Android非UI主线程中，若干普通Java线程使用Handler发送接收消息线程1和线程2均为普通Java线程，在Android中创建，然后在这两个普通Java线程中使用Handler发送和接收消息。import android.os.Handler;import android.os.Looper;import android.os.Message;import android.os.\_java handler 非主线程![favicon32.ico][]https://blog.csdn.net/zhangphil/article/details/79295141][Android_UI_Java_Handler_java handler _-CSDN_1.4k_Android_UI_Java_Handler_1_2_Java_Android_Java_Handler_import android.os.Handler_import android.os.Looper_import android.os.Message_import android.os._java handler _favicon32.ico_https_blog.csdn.net_zhangphil_article_details_79295141]

[favicon32.ico]: https://image.dandelioncloud.cn/pgy_files/images/2024/02/20/acb471d0b28f4d309ef9db3227ad0f7c.png
[Android Handler_Looper_Message_zhangphil looper-CSDN_1.6k_Handler_Looper_Message_Button_Looper_LogCat_package zhangphil.looper_import android.os.Bundle_import android.os.Handler_import android.os.Looper_imp_zhangphil looper_favicon32.ico_https_blog.csdn.net_zhangphil_article_details_43878993]: https://blog.csdn.net/zhangphil/article/details/43878993
[Android_UI_Java_Handler_java handler _-CSDN_1.4k_Android_UI_Java_Handler_1_2_Java_Android_Java_Handler_import android.os.Handler_import android.os.Looper_import android.os.Message_import android.os._java handler _favicon32.ico_https_blog.csdn.net_zhangphil_article_details_79295141]: https://blog.csdn.net/zhangphil/article/details/79295141