Can't create handler inside thread that has not called Looper.prepare() 解决办法

在开发的过程当中，遇到了想在一个线程中弹出一个提示窗 new AlertDialog.Builder(
context)，但是就出现了一个问题。

java.lang.RuntimeException: Can't create handler inside thread that has not called Looper.prepare()

分析了一下原因，应该是不能在线程中操作UI界面。

然后我就就在线程里面新开一个线程，再配上hangler通信但是还是有错误，最后查看了handler才知道是没有getMainLooper()。

因为在UI主线程之外是无法对UI组件进行控制的。因为你必须在新线程任务完成之后利用各种方法先UI主线程发送消息通知任务完成从而来显示各种提示消息。

最后变成这样，搞掂了

new Thread() {@Overridepublic void run() {Message msg = new Message();msg.what = 0;handler.sendMessage(msg);}}.start();handler = new Handler(context.getMainLooper()) {@Overridepublic void handleMessage(Message msg) {if (0 == msg.what) {new AlertDialog.Builder(context).setTitle("提示").setIcon(R.drawable.icon).setMessage("确定要回到打乱状态吗!!").setPositiveButton("确定",new DialogInterface.OnClickListener() {public void onClick(DialogInterface arg0,int arg1) {rBlockGroup.setmap(replayStart);gamestart = GAMESTATR_REPLAY;// replayCount = 0;// repalyCurrentStep =// 0;replayState = GAMESTATR_RUN;}}).setNegativeButton("取消",new DialogInterface.OnClickListener() {@Overridepublic void onClick(DialogInterface arg0,int arg1) {}}).create().show();}}};

转载于:https://www.cnblogs.com/mczha/p/3655875.html

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Can't create handler inside thread that has not called Looper.prepare() 解决办法

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