将字符串解析为 double 时出现 android 错误

Question

enter code here

 06-27 00:34:04.641: ERROR/AndroidRuntime(13633): FATAL EXCEPTION: main
06-27 00:34:04.641: ERROR/AndroidRuntime(13633): java.lang.RuntimeException: Unable to start activity ComponentInfo{yaraby.y/yaraby.y.ghost}: java.lang.NumberFormatException: 
06-27 00:34:04.641: ERROR/AndroidRuntime(13633):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2669)
06-27 00:34:04.641: ERROR/AndroidRuntime(13633):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2685)
06-27 00:34:04.641: ERROR/AndroidRuntime(13633):     at android.app.ActivityThread.access$2300(ActivityThread.java:126)
06-27 00:34:04.641: ERROR/AndroidRuntime(13633):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2038)
06-27 00:34:04.641: ERROR/AndroidRuntime(13633):     at android.os.Handler.dispatchMessage(Handler.java:99)
06-27 00:34:04.641: ERROR/AndroidRuntime(13633):     at android.os.Looper.loop(Looper.java:123)
06-27 00:34:04.641: ERROR/AndroidRuntime(13633):     at android.app.ActivityThread.main(ActivityThread.java:4633)
06-27 00:34:04.641: ERROR/AndroidRuntime(13633):     at java.lang.reflect.Method.invokeNative(Native Method)
06-27 00:34:04.641: ERROR/AndroidRuntime(13633):     at java.lang.reflect.Method.invoke(Method.java:521)
06-27 00:34:04.641: ERROR/AndroidRuntime(13633):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:858)
 06-27 00:34:04.641: ERROR/AndroidRuntime(13633):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
 06-27 00:34:04.641: ERROR/AndroidRuntime(13633):     at dalvik.system.NativeStart.main(Native Method)
  06-27 00:34:04.641: ERROR/AndroidRuntime(13633): Caused by: java.lang.NumberFormatException: 
  06-27 00:34:04.641: ERROR/AndroidRuntime(13633):     at org.apache.harmony.luni.util.FloatingPointParser.parseDouble(FloatingPointParser.java:267)
 06-27 00:34:04.641: ERROR/AndroidRuntime(13633):     at java.lang.Double.parseDouble(Double.java:287)
 06-27 00:34:04.641: ERROR/AndroidRuntime(13633):     at yaraby.y.ghost.onCreate(ghost.java:89)
  06-27 00:34:04.641: ERROR/AndroidRuntime(13633):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
    06-27 00:34:04.641: ERROR/AndroidRuntime(13633):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2633)
  06-27 00:34:04.641: ERROR/AndroidRuntime(13633):     ... 11 more

第89行是

enter code here
  Double p1=    Double.parseDouble(x); 

我从服务器接收到的是字符串，我希望它是 double 的并且它已经是 double 字但作为字符串接收

enter code here
 String x=inFromServer.readLine();
         String y=inFromServer.readLine();


            x=x.trim();
   Double p1=   Double.parseDouble(x);
                    y=y.trim();
        Double p2=   Double.parseDouble(y);

Answer 1

字符串是否包含“.” (如 123.45)或“，”(如 123,45)？

您应该根据您的区域设置替换它。 Try catch block 也可以工作。