子线程Handler.sendMessage 报错:Attempt to invoke virtual method 'boolean android.os.Handler.sendMessage
原因一:检查是否定义handler, 需要定义handler来接受sendMessage 发送的数据,具体代码如下:
private Handler handler; handler = new Handler() { @Override public void handleMessage(Message msg) { } }
原因二:参考https://blog.csdn.net/Rodulf/article/details/50910356