Permission Denial: starting Intent 解决办法 .

最近在调试程序的时候经常出现ActivityManager: java.lang.SecurityException: Permission Denial: starting Intent { act=android.intent.action.MAIN cat=[android.intent.category.LAUNCHER] flg=0x10000000 cmp=com.xxxxx.xxxxx/.ui.xxxxxxx } from null (pid=-1, uid=-1) requires null的问题，困扰我好几天了，一开始只是认为权限的问题，跟了好久一直没有解决。 

后来看到： 

The java.lang.SecurityException you are seeing is because you may enter two entries pointing to same activity. Remove the second one and you should be good to go. 

才发现这个Activity在Manifest文件里写了两份，去掉一份后，终于可以正常运行了。 

注：此问题还会引起，在手机端点击程序图标时，会提示程序未安装在手机上。 



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