0
我有Locaiton
的ArrayList
和long
的Array
而我試圖傳遞給新的活動,然後將它們寫入文件。傳遞ParcelableArrayList和LongArray到新的活動
Bundle b = new Bundle();
Intent i = new Intent(Begin_Run.this, GPSTrackDetails.class);
Times = convertLong(times);
b.putParcelableArrayList("Locations", locations);
b.putLongArray("Times", Times);
i.putExtra("bundle", b);
startActivity(i);
這是怎麼了,我用它們捆增加了Intent
。但是當我嘗試在新的活動中打印出來時,我得到一個空指針異常。
這就是我在新活動中將他們從Bundle
中帶出的方式。
Bundle bundle = getIntent().getExtras();
locations = bundle.getParcelableArrayList("Locations");
times = bundle.getLongArray("Times");
的logcat的輸出是
FATAL EXCEPTION: main
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.fyp.run_race/com.fyp.run_race.GPSTrackDetails}: java.lang.NullPointerException
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2663)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)
at android.app.ActivityThread.access$2300(ActivityThread.java:125)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:123)
at android.app.ActivityThread.main(ActivityThread.java:4627)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:521)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.NullPointerException
at com.fyp.run_race.GPSTrackDetails.onCreate(GPSTrackDetails.java:37)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627)
... 11 more
謝謝你完全解決了這個問題。 = d – 2012-02-08 22:10:50