我寫一個應用車中,我需要一個活動,已經通過點擊列表視圖中,用戶打開特定項目。列表視圖項排點擊產生的原因:java.lang.NumberFormatException
我使用列表視圖兩種不同的活動,一個顯示所選項目(S)即CartActivity.java和第二另一個動作表現出任何所選擇的項目即ProductInformationActivity.java
我已經寫代碼來調用一個活動,已經由用戶選擇的特定項目,在列表視圖CartActivity.java
// below is the line number 77
itemamount = Double.parseDouble(text_cost_code.getText().toString());
logcat的表示:
04-30 14:37:10.073: E/AndroidRuntime(273): FATAL EXCEPTION: main
04-30 14:37:10.073: E/AndroidRuntime(273): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.era.restaurant.versionoct/com.era.restaurant.versionoct.menu.ProductInformationActivity}: java.lang.NumberFormatException:
04-30 14:37:10.073: E/AndroidRuntime(273): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2663)
04-30 14:37:10.073: E/AndroidRuntime(273): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)
04-30 14:37:10.073: E/AndroidRuntime(273): at android.app.ActivityThread.access$2300(ActivityThread.java:125)
04-30 14:37:10.073: E/AndroidRuntime(273): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033)
04-30 14:37:10.073: E/AndroidRuntime(273): at android.os.Handler.dispatchMessage(Handler.java:99)
04-30 14:37:10.073: E/AndroidRuntime(273): at android.os.Looper.loop(Looper.java:123)
04-30 14:37:10.073: E/AndroidRuntime(273): at android.app.ActivityThread.main(ActivityThread.java:4627)
04-30 14:37:10.073: E/AndroidRuntime(273): at java.lang.reflect.Method.invokeNative(Native Method)
04-30 14:37:10.073: E/AndroidRuntime(273): at java.lang.reflect.Method.invoke(Method.java:521)
04-30 14:37:10.073: E/AndroidRuntime(273): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
04-30 14:37:10.073: E/AndroidRuntime(273): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
04-30 14:37:10.073: E/AndroidRuntime(273): at dalvik.system.NativeStart.main(Native Method)
04-30 14:37:10.073: E/AndroidRuntime(273): Caused by: java.lang.NumberFormatException:
04-30 14:37:10.073: E/AndroidRuntime(273): at org.apache.harmony.luni.util.FloatingPointParser.parseDouble(FloatingPointParser.java:267)
04-30 14:37:10.073: E/AndroidRuntime(273): at java.lang.Double.parseDouble(Double.java:287)
04-30 14:37:10.073: E/AndroidRuntime(273): at com.era.restaurant.versionoct.menu.ProductInformationActivity.onCreate(ProductInformationActivity.java:77)
04-30 14:37:10.073: E/AndroidRuntime(273): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
04-30 14:37:10.073: E/AndroidRuntime(273): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627)
04-30 14:37:10.073: E/AndroidRuntime(273): ... 11 more
什麼是你的行數77'04-30 14:37:10.073:E/AndroidRuntime(273):at com.era.restaurant.versionoct.menu.ProductInformationActivity.onCreate(ProductInformationActivity.java:77)' – SilentKiller 2013-04-30 09:26:03
首先查看ProductInformationActivity.java行77 – 2013-04-30 09:26:05
可能是由於文本應該爲null或txt_total.setText(String.valueOf(itemamount)); – 2013-04-30 09:30:03