我正在嘗試爲我的大學項目開發一個應用程序,用於跟蹤由ADS-B接收器拾取的飛機,該接收器連接到將數據流式傳輸到我的服務器應用程序。爲了做到這一點,我創建了一個「飛機」類,以跟蹤飛機的位置,可以通過每一個獨特的Mode-S十六進制碼和每個發現的飛機的ArrayList進行識別。NumberFormatException嘗試在Android中創建對象時
這是應該建立飛機對象的代碼:
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
然後被添加到ArrayList像這樣:
aircraftArrayList.add(aircraftToAdd);
不過,出現這種情況:
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)
我只是厭倦了這些錯誤。我甚至嘗試通過從它創建一個字符串並將它插入它的位置來替換sbsMessageArray [4],但這沒有幫助。
問題是你的'Integer.parseInt()'的參數是空字符串。嘗試在解析爲「int」之前檢查字符串的長度。 –