我正在尝试为我的大学项目开发一个应用程序,用于跟踪由ADS-B接收器拾取的飞机,该接收器连接到将数据流式传输到我的服务器应用程序。为了做到这一点,我创建了一个“飞机”类,以跟踪飞机的位置,可以通过每一个独特的Mode-S十六进制码和每个发现的飞机的ArrayList进行识别。NumberFormatException尝试在Android中创建对象时
这是应该建立飞机对象的代码:
Aircraft aircraftToAdd = new Aircraft(sbsMessageArray[4], //Mode-S hex code
sbsMessageArray[10], //callsign
Integer.parseInt(sbsMessageArray[11]), //altitude
Integer.parseInt(sbsMessageArray[12]), //ground speed
Integer.parseInt(sbsMessageArray[13]), //track
Double.parseDouble(sbsMessageArray[14]), //latitude
Double.parseDouble(sbsMessageArray[15])); //longitude
然后被添加到ArrayList像这样:
aircraftArrayList.add(aircraftToAdd);
不过,出现这种情况:
02-26 16:09:26.869 14873-14873/com.example.se415017.maynoothskyradar E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.se415017.maynoothskyradar, PID: 14873
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.se415017.maynoothskyradar/com.example.se415017.maynoothskyradar.activities.MainActivity}: java.lang.NumberFormatException: Invalid int: ""
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2358)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2420)
at android.app.ActivityThread.access$900(ActivityThread.java:154)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1321)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5294)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:904)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:699)
Caused by: java.lang.NumberFormatException: Invalid int: ""
at java.lang.Integer.invalidInt(Integer.java:138)
at java.lang.Integer.parseInt(Integer.java:358)
at java.lang.Integer.parseInt(Integer.java:334)
at com.example.se415017.maynoothskyradar.activities.MainActivity.addAircraftToList(MainActivity.java:525)
at com.example.se415017.maynoothskyradar.activities.MainActivity.parseSBSMessage(MainActivity.java:516)
at com.example.se415017.maynoothskyradar.activities.MainActivity.readFromTextFile(MainActivity.java:419)
at com.example.se415017.maynoothskyradar.activities.MainActivity.onCreate(MainActivity.java:147)
at android.app.Activity.performCreate(Activity.java:5990)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1106)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2311)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2420)
at android.app.ActivityThread.access$900(ActivityThread.java:154)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1321)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5294)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:904)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:699)
我只是厌倦了这些错误。我甚至尝试通过从它创建一个字符串并将它插入它的位置来替换sbsMessageArray [4],但这没有帮助。
问题是你的'Integer.parseInt()'的参数是空字符串。尝试在解析为“int”之前检查字符串的长度。 –