我正在将一台机器上的一个仿真器实例的消息传输到同一台机器上的另一个仿真器实例。（我猜）客户端运行正常。但是，当我点击一个按钮，从客户端数据传输到服务器我得到了（SCOKET，的getOutputStream（））客户端服务器应用程序在android NullPointer错误？

PrintWriter out = new PrintWriter(new BufferedWriter(
         new OutputStreamWriter(socket.getOutputStream())), 
         true);

空指针异常我有时也得到了许可，不得以客户吃了饭错误

我有完成所有重定向，并且在Android清单文件中也加入INTERNET标签，

我得到的服务器权限被拒绝错误而崩溃，但我加上网后允许标签服务器工作.. 但是，当我加了相同的标记，以客户清单文件客户端崩溃

SO我不能够通过添加INTERNET标签同时删除权限被拒绝的错误是不能够清除空指针异常

而且在客户端和本地机器有不同的时区。默认情况下，android模拟器不会使用本地TZ。

所以我设置了-timezone选项，甚至不会改变timzone区域 AFAIK我想我正在做的事情正确w.r.t端口和ips。创建套接字时没有错误，但只有在使用socket.ouputstream时才有错误？有没有防火墙问题。？

我已经广泛搜索并且不确定问题是什么。期待您的帮助。谢谢。

编辑：

我使用的客户端服务器代码从这里NickT Connecting 2 Emulator instances In Android 和已经修改了一点我得到的误差3 ，当我打印错误：

11-25 18:59:06.185: W/System.err(388): java.net.SocketException: Permission denied 
11-25 18:59:06.185: W/System.err(388): at org.apache.harmony.luni.platform.OSNetworkSystem.socket(Native Method) 
11-25 18:59:06.185: W/System.err(388): at dalvik.system.BlockGuard$WrappedNetworkSystem.socket(BlockGuard.java:347) 
11-25 18:59:06.185: W/System.err(388): at org.apache.harmony.luni.net.PlainSocketImpl.create(PlainSocketImpl.java:220) 
11-25 18:59:06.185: W/System.err(388): at java.net.Socket.startupSocket(Socket.java:618) 
11-25 18:59:06.185: W/System.err(388): at java.net.Socket.<init>(Socket.java:258) 
11-25 18:59:06.185: W/System.err(388): at net.wipp.ece.ClAct.onCreate(ClAct.java:40) 
11-25 18:59:06.185: W/System.err(388): at android.app.Activity.performCreate(Activity.java:4397) 
11-25 18:59:06.185: W/System.err(388): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1048) 
11-25 18:59:06.185: W/System.err(388): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1779) 
11-25 18:59:06.185: W/System.err(388): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1831) 
11-25 18:59:06.185: W/System.err(388): at android.app.ActivityThread.access$500(ActivityThread.java:122) 
11-25 18:59:06.185: W/System.err(388): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1024) 
11-25 18:59:06.185: W/System.err(388): at android.os.Handler.dispatchMessage(Handler.java:99) 
11-25 18:59:06.185: W/System.err(388): at android.os.Looper.loop(Looper.java:132) 
11-25 18:59:06.185: W/System.err(388): at android.app.ActivityThread.main(ActivityThread.java:4123) 
11-25 18:59:06.185: W/System.err(388): at java.lang.reflect.Method.invokeNative(Native Method) 
11-25 18:59:06.185: W/System.err(388): at java.lang.reflect.Method.invoke(Method.java:491) 
11-25 18:59:06.185: W/System.err(388): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:841) 
11-25 18:59:06.185: W/System.err(388): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:599) 
11-25 18:59:06.185: W/System.err(388): at dalvik.system.NativeStart.main(Native Method) 
11-25 19:00:14.045: W/System.err(388): java.lang.NullPointerException 
11-25 19:00:14.055: W/System.err(388): at net.wipp.ece.ClAct$1.onClick(ClAct.java:54) 
11-25 19:00:14.055: W/System.err(388): at android.view.View.performClick(View.java:3110) 
11-25 19:00:14.065: W/System.err(388): at android.view.View$PerformClick.run(View.java:11934) 
11-25 19:00:14.065: W/System.err(388): at android.os.Handler.handleCallback(Handler.java:587) 
11-25 19:00:14.065: W/System.err(388): at android.os.Handler.dispatchMessage(Handler.java:92) 
11-25 19:00:14.065: W/System.err(388): at android.os.Looper.loop(Looper.java:132) 
11-25 19:00:14.065: W/System.err(388): at android.app.ActivityThread.main(ActivityThread.java:4123) 
11-25 19:00:14.065: W/System.err(388): at java.lang.reflect.Method.invokeNative(Native Method) 
11-25 19:00:14.065: W/System.err(388): at java.lang.reflect.Method.invoke(Method.java:491) 
11-25 19:00:14.065: W/System.err(388): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:841) 
11-25 19:00:14.065: W/System.err(388): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:599) 
11-25 19:00:14.065: W/System.err(388): at dalvik.system.NativeStart.main(Native Method) 
11-25 19:19:45.285: D/dalvikvm(388): GC_CONCURRENT freed 349K, 7% free 6380K/6791K, paused 10ms+2ms 
11-25 19:26:27.115: I/dalvikvm(388): Jit: resizing JitTable from 512 to 1024 
11-25 19:49:48.055: D/dalvikvm(388): GC_CONCURRENT freed 419K, 8% free 6378K/6919K, paused 7ms+2ms 
11-25 20:19:58.565: D/dalvikvm(388): GC_CONCURRENT freed 419K, 8% free 6378K/6919K, paused 7ms+2ms 
11-25 20:45:27.594: I/dalvikvm(388): Jit: resizing JitTable from 1024 to 2048 
11-25 20:50:09.304: D/dalvikvm(388): GC_CONCURRENT freed 419K, 8% free 6378K/6919K, paused 7ms+3ms 
11-25 21:20:19.785: D/dalvikvm(388): GC_CONCURRENT freed 419K, 8% free 6378K/6919K, paused 4ms+2ms 
11-25 21:50:29.924: D/dalvikvm(388): GC_CONCURRENT freed 419K, 8% free 6378K/6919K, paused 8ms+5ms 
11-25 22:20:40.565: D/dalvikvm(388): GC_CONCURRENT freed 419K, 8% free 6378K/6919K, paused 8ms+3ms 
11-25 22:50:50.675: D/dalvikvm(388): GC_CONCURRENT freed 419K, 8% free 6378K/6919K, paused 7ms+2ms 
11-25 23:21:00.474: D/dalvikvm(388): GC_CONCURRENT freed 419K, 8% free 6378K/6919K, paused 5ms+4ms 
11-25 23:51:10.485: D/dalvikvm(388): GC_CONCURRENT freed 419K, 8% free 6378K/6919K, paused 11ms+3ms 
11-26 00:21:20.725: D/dalvikvm(388): GC_CONCURRENT freed 419K, 8% free 6378K/6919K, paused 8ms+2ms 
11-26 00:51:30.835: D/dalvikvm(388): GC_CONCURRENT freed 419K, 8% free 6378K/6919K, paused 8ms+3ms 
11-26 01:21:41.254: D/dalvikvm(388): GC_CONCURRENT freed 419K, 8% free 6378K/6919K, paused 12ms+4ms 
11-26 01:48:27.275: W/System.err(388): java.lang.NullPointerException 
11-26 01:48:27.275: W/System.err(388): at net.wipp.ece.ClAct$1.onClick(ClAct.java:54) 
11-26 01:48:27.275: W/System.err(388): at android.view.View.performClick(View.java:3110) 
11-26 01:48:27.275: W/System.err(388): at android.view.View$PerformClick.run(View.java:11934) 
11-26 01:48:27.275: W/System.err(388): at android.os.Handler.handleCallback(Handler.java:587) 
11-26 01:48:27.275: W/System.err(388): at android.os.Handler.dispatchMessage(Handler.java:92) 
11-26 01:48:27.285: W/System.err(388): at android.os.Looper.loop(Looper.java:132) 
11-26 01:48:27.285: W/System.err(388): at android.app.ActivityThread.main(ActivityThread.java:4123) 
11-26 01:48:27.285: W/System.err(388): at java.lang.reflect.Method.invokeNative(Native Method) 
11-26 01:48:27.285: W/System.err(388): at java.lang.reflect.Method.invoke(Method.java:491) 
11-26 01:48:27.295: W/System.err(388): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:841) 
11-26 01:48:27.295: W/System.err(388): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:599) 
11-26 01:48:27.295: W/System.err(388): at dalvik.system.NativeStart.main(Native Method) 
11-26 01:48:32.734: W/System.err(388): java.lang.NullPointerException 
11-26 01:48:32.744: W/System.err(388): at net.wipp.ece.ClAct$1.onClick(ClAct.java:54) 
11-26 01:48:32.744: W/System.err(388): at android.view.View.performClick(View.java:3110) 
11-26 01:48:32.744: W/System.err(388): at android.view.View$PerformClick.run(View.java:11934) 
11-26 01:48:32.744: W/System.err(388): at android.os.Handler.handleCallback(Handler.java:587) 
11-26 01:48:32.744: W/System.err(388): at android.os.Handler.dispatchMessage(Handler.java:92) 
11-26 01:48:32.744: W/System.err(388): at android.os.Looper.loop(Looper.java:132) 
11-26 01:48:32.744: W/System.err(388): at android.app.ActivityThread.main(ActivityThread.java:4123) 
11-26 01:48:32.744: W/System.err(388): at java.lang.reflect.Method.invokeNative(Native Method) 
11-26 01:48:32.744: W/System.err(388): at java.lang.reflect.Method.invoke(Method.java:491) 
11-26 01:48:32.744: W/System.err(388): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:841) 
11-26 01:48:32.754: W/System.err(388): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:599) 
11-26 01:48:32.754: W/System.err(388): at dalvik.system.NativeStart.main(Native Method) 
11-26 01:48:32.945: W/System.err(388): java.lang.NullPointerException 
11-26 01:48:32.945: W/System.err(388): at net.wipp.ece.ClAct$1.onClick(ClAct.java:54) 
11-26 01:48:32.945: W/System.err(388): at android.view.View.performClick(View.java:3110) 
11-26 01:48:32.945: W/System.err(388): at android.view.View$PerformClick.run(View.java:11934) 
11-26 01:48:32.945: W/System.err(388): at android.os.Handler.handleCallback(Handler.java:587) 
11-26 01:48:32.955: W/System.err(388): at android.os.Handler.dispatchMessage(Handler.java:92) 
11-26 01:48:32.955: W/System.err(388): at android.os.Looper.loop(Looper.java:132) 
11-26 01:48:32.955: W/System.err(388): at android.app.ActivityThread.main(ActivityThread.java:4123) 
11-26 01:48:32.955: W/System.err(388): at java.lang.reflect.Method.invokeNative(Native Method) 
11-26 01:48:32.955: W/System.err(388): at java.lang.reflect.Method.invoke(Method.java:491) 
11-26 01:48:32.955: W/System.err(388): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:841) 
11-26 01:48:32.955: W/System.err(388): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:599) 
11-26 01:48:32.955: W/System.err(388): at dalvik.system.NativeStart.main(Native Method) 
11-26 01:48:33.116: W/System.err(388): java.lang.NullPointerException 
11-26 01:48:33.116: W/System.err(388): at net.wipp.ece.ClAct$1.onClick(ClAct.java:54) 
11-26 01:48:33.116: W/System.err(388): at android.view.View.performClick(View.java:3110) 
11-26 01:48:33.116: W/System.err(388): at android.view.View$PerformClick.run(View.java:11934) 
11-26 01:48:33.116: W/System.err(388): at android.os.Handler.handleCallback(Handler.java:587) 
11-26 01:48:33.116: W/System.err(388): at android.os.Handler.dispatchMessage(Handler.java:92) 
11-26 01:48:33.116: W/System.err(388): at android.os.Looper.loop(Looper.java:132) 
11-26 01:48:33.125: W/System.err(388): at android.app.ActivityThread.main(ActivityThread.java:4123) 
11-26 01:48:33.125: W/System.err(388): at java.lang.reflect.Method.invokeNative(Native Method) 
11-26 01:48:33.125: W/System.err(388): at java.lang.reflect.Method.invoke(Method.java:491) 
11-26 01:48:33.125: W/System.err(388): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:841) 
11-26 01:48:33.125: W/System.err(388): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:599) 
11-26 01:48:33.155: W/System.err(388): at dalvik.system.NativeStart.main(Native Method) 
11-26 01:48:33.195: D/dalvikvm(388): GC_CONCURRENT freed 415K, 8% free 6382K/6919K, paused 4ms+2ms 
11-26 01:48:33.305: W/System.err(388): java.lang.NullPointerException 
11-26 01:48:33.305: W/System.err(388): at net.wipp.ece.ClAct$1.onClick(ClAct.java:54) 
11-26 01:48:33.305: W/System.err(388): at android.view.View.performClick(View.java:3110) 
11-26 01:48:33.305: W/System.err(388): at android.view.View$PerformClick.run(View.java:11934) 
11-26 01:48:33.305: W/System.err(388): at android.os.Handler.handleCallback(Handler.java:587) 
11-26 01:48:33.305: W/System.err(388): at android.os.Handler.dispatchMessage(Handler.java:92) 
11-26 01:48:33.305: W/System.err(388): at android.os.Looper.loop(Looper.java:132) 
11-26 01:48:33.305: W/System.err(388): at android.app.ActivityThread.main(ActivityThread.java:4123) 
11-26 01:48:33.305: W/System.err(388): at java.lang.reflect.Method.invokeNative(Native Method) 
11-26 01:48:33.305: W/System.err(388): at java.lang.reflect.Method.invoke(Method.java:491) 
11-26 01:48:33.305: W/System.err(388): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:841) 
11-26 01:48:33.315: W/System.err(388): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:599) 
11-26 01:48:33.315: W/System.err(388): at dalvik.system.NativeStart.main(Native Method) 
11-26 01:48:33.455: W/System.err(388): java.lang.NullPointerException 
11-26 01:48:33.465: W/System.err(388): at net.wipp.ece.ClAct$1.onClick(ClAct.java:54) 
11-26 01:48:33.465: W/System.err(388): at android.view.View.performClick(View.java:3110) 
11-26 01:48:33.465: W/System.err(388): at android.view.View$PerformClick.run(View.java:11934) 
11-26 01:48:33.465: W/System.err(388): at android.os.Handler.handleCallback(Handler.java:587) 
11-26 01:48:33.465: W/System.err(388): at android.os.Handler.dispatchMessage(Handler.java:92) 
11-26 01:48:33.475: W/System.err(388): at android.os.Looper.loop(Looper.java:132) 
11-26 01:48:33.475: W/System.err(388): at android.app.ActivityThread.main(ActivityThread.java:4123) 
11-26 01:48:33.475: W/System.err(388): at java.lang.reflect.Method.invokeNative(Native Method) 
11-26 01:48:33.475: W/System.err(388): at java.lang.reflect.Method.invoke(Method.java:491) 
11-26 01:48:33.475: W/System.err(388): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:841) 
11-26 01:48:33.475: W/System.err(388): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:599) 
11-26 01:48:33.475: W/System.err(388): at dalvik.system.NativeStart.main(Native Method) 
11-26 01:48:33.764: W/System.err(388): java.lang.NullPointerException 
11-26 01:48:33.764: W/System.err(388): at net.wipp.ece.ClAct$1.onClick(ClAct.java:54) 
11-26 01:48:33.764: W/System.err(388): at android.view.View.performClick(View.java:3110) 
11-26 01:48:33.764: W/System.err(388): at android.view.View$PerformClick.run(View.java:11934) 
11-26 01:48:33.764: W/System.err(388): at android.os.Handler.handleCallback(Handler.java:587) 
11-26 01:48:33.764: W/System.err(388): at android.os.Handler.dispatchMessage(Handler.java:92) 
11-26 01:48:33.774: W/System.err(388): at android.os.Looper.loop(Looper.java:132) 
11-26 01:48:33.774: W/System.err(388): at android.app.ActivityThread.main(ActivityThread.java:4123) 
11-26 01:48:33.774: W/System.err(388): at java.lang.reflect.Method.invokeNative(Native Method) 
11-26 01:48:33.774: W/System.err(388): at java.lang.reflect.Method.invoke(Method.java:491) 
11-26 01:48:33.774: W/System.err(388): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:841) 
11-26 01:48:33.774: W/System.err(388): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:599) 
11-26 01:48:33.774: W/System.err(388): at dalvik.system.NativeStart.main(Native Method) 
11-26 01:50:49.035: W/System.err(472): java.net.SocketException: Permission denied 
11-26 01:50:49.035: W/System.err(472): at org.apache.harmony.luni.platform.OSNetworkSystem.socket(Native Method) 
11-26 01:50:49.035: W/System.err(472): at dalvik.system.BlockGuard$WrappedNetworkSystem.socket(BlockGuard.java:347) 
11-26 01:50:49.035: W/System.err(472): at org.apache.harmony.luni.net.PlainSocketImpl.create(PlainSocketImpl.java:220) 
11-26 01:50:49.045: W/System.err(472): at java.net.Socket.startupSocket(Socket.java:618) 
11-26 01:50:49.045: W/System.err(472): at java.net.Socket.<init>(Socket.java:258) 
11-26 01:50:49.045: W/System.err(472): at net.wipp.ece.ClAct.onCreate(ClAct.java:40) 
11-26 01:50:49.045: W/System.err(472): at android.app.Activity.performCreate(Activity.java:4397) 
11-26 01:50:49.045: W/System.err(472): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1048) 
11-26 01:50:49.045: W/System.err(472): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1779) 
11-26 01:50:49.045: W/System.err(472): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1831) 
11-26 01:50:49.045: W/System.err(472): at android.app.ActivityThread.access$500(ActivityThread.java:122) 
11-26 01:50:49.045: W/System.err(472): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1024) 
11-26 01:50:49.055: W/System.err(472): at android.os.Handler.dispatchMessage(Handler.java:99) 
11-26 01:50:49.055: W/System.err(472): at android.os.Looper.loop(Looper.java:132) 
11-26 01:50:49.055: W/System.err(472): at android.app.ActivityThread.main(ActivityThread.java:4123) 
11-26 01:50:49.055: W/System.err(472): at java.lang.reflect.Method.invokeNative(Native Method) 
11-26 01:50:49.055: W/System.err(472): at java.lang.reflect.Method.invoke(Method.java:491) 
11-26 01:50:49.055: W/System.err(472): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:841) 
11-26 01:50:49.055: W/System.err(472): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:599) 
11-26 01:50:49.055: W/System.err(472): at dalvik.system.NativeStart.main(Native Method) 
11-26 01:50:54.375: E/Client(472): java.lang.NullPointerException 
11-26 01:50:54.375: E/Client(472): at net.wipp.ece.ClAct$1.onClick(ClAct.java:54) 
11-26 01:50:54.375: E/Client(472): at android.view.View.performClick(View.java:3110) 
11-26 01:50:54.375: E/Client(472): at android.view.View$PerformClick.run(View.java:11934) 
11-26 01:50:54.375: E/Client(472): at android.os.Handler.handleCallback(Handler.java:587) 
11-26 01:50:54.375: E/Client(472): at android.os.Handler.dispatchMessage(Handler.java:92) 
11-26 01:50:54.375: E/Client(472): at android.os.Looper.loop(Looper.java:132) 
11-26 01:50:54.375: E/Client(472): at android.app.ActivityThread.main(ActivityThread.java:4123) 
11-26 01:50:54.375: E/Client(472): at java.lang.reflect.Method.invokeNative(Native Method) 
11-26 01:50:54.375: E/Client(472): at java.lang.reflect.Method.invoke(Method.java:491) 
11-26 01:50:54.375: E/Client(472): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:841) 
11-26 01:50:54.375: E/Client(472): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:599) 
11-26 01:50:54.375: E/Client(472): at dalvik.system.NativeStart.main(Native Method) 
11-26 01:50:54.375: W/System.err(472): java.lang.NullPointerException 
11-26 01:50:54.375: W/System.err(472): at net.wipp.ece.ClAct$1.onClick(ClAct.java:54) 
11-26 01:50:54.375: W/System.err(472): at android.view.View.performClick(View.java:3110) 
11-26 01:50:54.375: W/System.err(472): at android.view.View$PerformClick.run(View.java:11934) 
11-26 01:50:54.375: W/System.err(472): at android.os.Handler.handleCallback(Handler.java:587) 
11-26 01:50:54.385: W/System.err(472): at android.os.Handler.dispatchMessage(Handler.java:92) 
11-26 01:50:54.385: W/System.err(472): at android.os.Looper.loop(Looper.java:132) 
11-26 01:50:54.385: W/System.err(472): at android.app.ActivityThread.main(ActivityThread.java:4123) 
11-26 01:50:54.385: W/System.err(472): at java.lang.reflect.Method.invokeNative(Native Method) 
11-26 01:50:54.385: W/System.err(472): at java.lang.reflect.Method.invoke(Method.java:491) 
11-26 01:50:54.385: W/System.err(472): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:841) 
11-26 01:50:54.385: W/System.err(472): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:599) 
11-26 01:50:54.385: W/System.err(472): at dalvik.system.NativeStart.main(Native Method)

来源

2011-11-25 Dexters

请发布错误日志。也发布如何套接字被实例化 – Jack

刚刚添加日志 – Dexters

的例外日志告诉你确切的错误在哪里：

at net.wipp.ece.ClAct$1.onClick(ClAct.java:54)

这意味着在你的ClAct类中，在onClick方法中，在第54行有一些是空的。如果你设置了一个断点并一直调试到那一点，那么你会发现该行的内容为空。

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2011-11-26 03:33:58 Jack

是的..这就是我引用的线我在null中“socket.getOutputStream（）” 但我不确定什么导致getoutputstream（）中的错误？ – Dexters

您的INTERNET权限标志必须在客户端和服务器上都设置。调试时，您的套接字对象为空吗？ – Jack

但是当我在客户端添加INTERNET flas时，客户端只是崩溃.. – Dexters

客户端服务器应用程序在android NullPointer错误？

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