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本博客主要是对4月25日-4月29日学习经历的总结和接受。这段时间每天都在处理很多bug,所以没怎么写博客。想想我一个星期或者很多年遇到的问题。我们来总结一下。

1.遇到java.lang.NullPointerException: Attempt to invoke virtual method ‘void android.view.View...的解决方法

2.android 点击退出按钮 结束所有的activity 回到手机主页面

3.43isjl0t1ar4206.png

4.导入图片错误

5.底部导航栏三个显示四个为什么就不显示了

6.Fragment实现页面跳转

除了以上,还有一些小问题,就不一一列举了。然后这段时间也接触了GPS定位实现的知识,卡住了。我以后会发相关的博客。

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