Android error.java.lang.NullPointerException

//你不能在后台运行Toast。 任何UI操作都只能在UI线程中执行

//从异步任务中删除下面这一行

11-27 22:57:22.581: E/Trace(1675): error opening trace file: No such file or directory (2)
11-27 22:57:22.881: D/libEGL(1675): loaded /system/lib/egl/libEGL_emulation.so
11-27 22:57:22.885: D/(1675): HostConnection::get() New Host Connection established 0xb9087948, tid 1675
11-27 22:57:22.901: D/libEGL(1675): loaded /system/lib/egl/libGLESv1_CM_emulation.so
11-27 22:57:22.901: D/libEGL(1675): loaded /system/lib/egl/libGLESv2_emulation.so
11-27 22:57:23.185: W/EGL_emulation(1675): eglSurfaceAttrib not implemented
11-27 22:57:23.201: D/OpenGLRenderer(1675): Enabling debug mode 0
11-27 22:57:27.037: W/EGL_emulation(1675): eglSurfaceAttrib not implemented
11-27 22:57:29.181: W/EGL_emulation(1675): eglSurfaceAttrib not implemented
11-27 22:57:29.289: D/dalvikvm(1675): GC_CONCURRENT freed 120K, 3% free 6232K/6400K, paused 6ms+1ms, total 75ms
11-27 22:57:30.549: E/log_tag(1675): Error in http connection java.lang.NullPointerException

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不要在日志消息中使用e.toString（），而是使用格式Log.e（“Log_标记”，“http连接错误”，e）；这将打印出堆栈跟踪。你已经在SO上发布了两个问题，但实际上你没有提供任何关于你所追求的东西的真实描述-也许你应该先阅读规则，然后再回来，在任何情况下，strUrl有什么价值？这可能只是一个无效的连接

11-27 22:57:22.581: E/Trace(1675): error opening trace file: No such file or directory (2)
11-27 22:57:22.881: D/libEGL(1675): loaded /system/lib/egl/libEGL_emulation.so
11-27 22:57:22.885: D/(1675): HostConnection::get() New Host Connection established 0xb9087948, tid 1675
11-27 22:57:22.901: D/libEGL(1675): loaded /system/lib/egl/libGLESv1_CM_emulation.so
11-27 22:57:22.901: D/libEGL(1675): loaded /system/lib/egl/libGLESv2_emulation.so
11-27 22:57:23.185: W/EGL_emulation(1675): eglSurfaceAttrib not implemented
11-27 22:57:23.201: D/OpenGLRenderer(1675): Enabling debug mode 0
11-27 22:57:27.037: W/EGL_emulation(1675): eglSurfaceAttrib not implemented
11-27 22:57:29.181: W/EGL_emulation(1675): eglSurfaceAttrib not implemented
11-27 22:57:29.289: D/dalvikvm(1675): GC_CONCURRENT freed 120K, 3% free 6232K/6400K, paused 6ms+1ms, total 75ms
11-27 22:57:30.549: E/log_tag(1675): Error in http connection java.lang.NullPointerException

Toast.makeText(HomePage.this, latitude, Toast.LENGTH_LONG).show();