Android未调用Looper.prepare()-Can't create handler inside thread that has not called Looper.prepare()

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本文详细解释了Android应用开发中遇到的线程内未调用Looper.prepare()导致的运行时异常问题，并提供了解决方案。通过在特定线程的run()方法中加入Looper.prepare()语句，可以避免此类错误的发生。

Android 2.3.3       
Eclipse Version: 3.7.0       
LogCat

LogCat 报错信息：

02-06 12:08:12.794: WARN/dalvikvm(503): threadid=18: thread exiting with uncaught exception (group=0x40015560)
02-06 12:08:12.815: ERROR/AndroidRuntime(503): FATAL EXCEPTION: Thread-49
02-06 12:08:12.815: ERROR/AndroidRuntime(503): java.lang.RuntimeException: Can't create handler inside thread that has not called Looper.prepare()
02-06 12:08:12.815: ERROR/AndroidRuntime(503): at android.os.Handler.(Handler.java:121)
02-06 12:08:12.815: ERROR/AndroidRuntime(503): at android.app.Activity.(Activity.java:680)
02-06 12:08:12.815: ERROR/AndroidRuntime(503): at android.app.ListActivity.(ListActivity.java:175)
02-06 12:08:12.815: ERROR/AndroidRuntime(503): at android.preference.PreferenceActivity.(PreferenceActivity.java:76)
02-06 12:08:12.815: ERROR/AndroidRuntime(503): at com.taobao.nokia.manage.Preference.(Preference.java:62)
02-06 12:08:12.815: ERROR/AndroidRuntime(503): at com.taobao.nokia.List.run(List.java:297)
02-06 12:08:12.815: ERROR/AndroidRuntime(503): at java.lang.Thread.run(Thread.java:1019)
02-06 12:08:12.864: WARN/ActivityManager(61): Force finishing activity com.taobao.nokia/.Htc

发生错误原因：线程内未调用Looper.prepare()，不能创建处理器。
解决办法：在线程List的run()中加入 Looper.prepare();

public void run() {
	// TODO Auto-generated method stub
	super.run();
	Looper.prepare();
	setting = new Preference(context);
	}