Android：將TextView內容轉換爲整數然後使用setText時發生錯誤（）

Question

我有一些代碼獲取兩個Time Picker的內容並在TextView中分別顯示它們，但是當我計算兩者之間的差異並將其顯示在一個單獨的TextView我的應用程序崩潰。 以下是部分代碼：

private TextView mShiftLength; 

private TextView mTimeDisplay; 
private Button mPickTime; 

private TextView mTimeDisplayEnd; 
private Button mPickTimeEnd; 

    private void calcShiftLength() { 
    int mStartTime = Integer.parseInt(mTimeDisplay.getText().toString()); 
    int mEndTime = Integer.parseInt(mTimeDisplayEnd.getText().toString()); 

    int shiftLength = mEndTime - mStartTime; 

    mShiftLength.setText(Integer.toString(shiftLength)); 
} 

    private void updateDisplay() { 
    mTimeDisplay.setText(new StringBuilder().append(pad(mHour)).append(":") 
      .append(pad(mMinute))); 
} 

private void updateDisplayEnd() { 
    mTimeDisplayEnd.setText(new StringBuilder().append(pad(mHour)) 
      .append(":").append(pad(mMinute))); 
} 

編輯：錯誤logcat。對不起，我真的不太瞭解Android，我希望這是你以後的所有事情。

09-13 03:01:39.744: INFO/ActivityManager(59): Starting activity: 
Intent { act=android.intent.action.MAIN 
cat=[android.intent.category.LAUNCHER] flg=0x10000000 
cmp=MultipleTimePickers.UI/.MultipleTimePickers } 09-13 03:01:39.803: 
DEBUG/AndroidRuntime(331): Shutting down VM 09-13 03:01:39.813: 
DEBUG/dalvikvm(331): Debugger has detached; object registry had 1 
entries 09-13 03:01:40.044: INFO/AndroidRuntime(331): NOTE: attach of 
thread 'Binder Thread #3' failed 09-13 03:01:40.174: 
INFO/ActivityManager(59): Start proc MultipleTimePickers.UI for 
activity MultipleTimePickers.UI/.MultipleTimePickers: pid=338 
uid=10050 gids={} 09-13 03:01:41.364: DEBUG/AndroidRuntime(338): 
Shutting down VM 09-13 03:01:41.364: WARN/dalvikvm(338): threadid=1: 
thread exiting with uncaught exception (group=0x4001d800) 09-13 
03:01:41.393: ERROR/AndroidRuntime(338): FATAL EXCEPTION: main 09-13 
03:01:41.393: ERROR/AndroidRuntime(338): java.lang.RuntimeException: 
Unable to start activity 
ComponentInfo{MultipleTimePickers.UI/MultipleTimePickers.UI.MultipleTimePickers}: 
java.lang.NumberFormatException: unable to parse '03:01' as integer 
09-13 03:01:41.393: ERROR/AndroidRuntime(338):  at 
android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2663) 
09-13 03:01:41.393: ERROR/AndroidRuntime(338):  at 
android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679) 
09-13 03:01:41.393: ERROR/AndroidRuntime(338):  at 
android.app.ActivityThread.access$2300(ActivityThread.java:125) 09-13 
03:01:41.393: ERROR/AndroidRuntime(338):  at 
android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033) 
09-13 03:01:41.393: ERROR/AndroidRuntime(338):  at 
android.os.Handler.dispatchMessage(Handler.java:99) 09-13 
03:01:41.393: ERROR/AndroidRuntime(338):  at 
android.os.Looper.loop(Looper.java:123) 09-13 03:01:41.393: 
ERROR/AndroidRuntime(338):  at 
android.app.ActivityThread.main(ActivityThread.java:4627) 09-13 
03:01:41.393: ERROR/AndroidRuntime(338):  at 
java.lang.reflect.Method.invokeNative(Native Method) 09-13 
03:01:41.393: ERROR/AndroidRuntime(338):  at 
java.lang.reflect.Method.invoke(Method.java:521) 09-13 03:01:41.393: 
ERROR/AndroidRuntime(338):  at 
com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868) 
09-13 03:01:41.393: ERROR/AndroidRuntime(338):  at 
com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626) 09-13 
03:01:41.393: ERROR/AndroidRuntime(338):  at 
dalvik.system.NativeStart.main(Native Method) 09-13 03:01:41.393: 
ERROR/AndroidRuntime(338): Caused by: java.lang.NumberFormatException: 
unable to parse '03:01' as integer 09-13 03:01:41.393: 
ERROR/AndroidRuntime(338):  at 
java.lang.Integer.parse(Integer.java:433) 09-13 03:01:41.393: 
ERROR/AndroidRuntime(338):  at 
java.lang.Integer.parseInt(Integer.java:422) 09-13 03:01:41.393: 
ERROR/AndroidRuntime(338):  at 
java.lang.Integer.parseInt(Integer.java:382) 09-13 03:01:41.393: 
ERROR/AndroidRuntime(338):  at 
MultipleTimePickers.UI.MultipleTimePickers.calcShiftLength(MultipleTimePickers.java:70) 
09-13 03:01:41.393: ERROR/AndroidRuntime(338):  at 
MultipleTimePickers.UI.MultipleTimePickers.onCreate(MultipleTimePickers.java:66) 
09-13 03:01:41.393: ERROR/AndroidRuntime(338):  at 
android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047) 
09-13 03:01:41.393: ERROR/AndroidRuntime(338):  at 
android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627) 
09-13 03:01:41.393: ERROR/AndroidRuntime(338):  ... 11 more 09-13 
03:01:41.424: WARN/ActivityManager(59): Force finishing activity 
MultipleTimePickers.UI/.MultipleTimePickers 09-13 03:01:42.035: 
WARN/ActivityManager(59): Activity pause timeout for 
HistoryRecord{44e7de98 MultipleTimePickers.UI/.MultipleTimePickers} 
09-13 03:01:48.883: DEBUG/dalvikvm(182): GC_EXPLICIT freed 100 objects 
/4296 bytes in 163ms 09-13 03:01:53.740: WARN/ActivityManager(59): 
Activity destroy timeout for HistoryRecord{44e7de98 
MultipleTimePickers.UI/.MultipleTimePickers} 09-13 03:01:54.034: 
DEBUG/dalvikvm(269): GC_EXPLICIT freed 249 objects/11840 bytes in 
253ms 

這裏是最後的工作代碼，感謝大家的幫助：

private void calcShiftLength() { 
    String[] mStartTime = mTimeDisplay.getText().toString().split(":"); 
    String[] mEndTime = mTimeDisplayEnd.getText().toString().split(":"); 

    int mStartHour = Integer.parseInt(mStartTime[0].toString()); 
    int mStartMinute = Integer.parseInt(mStartTime[1].toString()); 

    int mEndHour = Integer.parseInt(mEndTime[0].toString()); 
    int mEndMinute = Integer.parseInt(mEndTime[1].toString()); 

    int mShiftLengthHour = mEndHour - mStartHour; 
    int mShiftLengthMinute = mEndMinute - mStartMinute; 

    mShiftLength.setText(new StringBuilder().append(pad(mShiftLengthHour)).append(":").append(pad(mShiftLengthMinute))); 
} 

Answer 1

NumberFormatException: unable to parse '03:01' as integer 

嘗試使用字符串的拆分方法，然後分析每個字符串爲整數。而其送花兒給人最好做的Integer.parseInt

http://download.oracle.com/javase/1.4.2/docs/api/java/lang/String.html#split%28java.lang.String%29

希望幫助時趕上NumberFormatException異常。