在活动之间传递ArrayList<String[]>
在活动之间传递ArrayList<String[]>
提问于 2014-01-05 02:17:37
我试图在两个活动之间传递一个ArrayList<String[]>，但似乎找不出如何实现它。
我尝试过putParcelable并将ArrayList<String[]转换为一个Parcelable，但这给了我错误java.lang.ClassCastException: java.util.ArrayList cannot be cast to android.os.Parcelable。
我也尝试过putStringArrayList，但这也不起作用。
非常感谢您的投入！
主活性
Intent i = new Intent(context, NewChecklistActivity.class);
i.putExtra("checklists", checklistsArray);次级活性
checklistsArray = (ArrayList<String[]>) getIntent().getSerializableExtra("checklists");StackTrace
01-04 18:49:09.140: E/AndroidRuntime(2246): FATAL EXCEPTION: main
01-04 18:49:09.140: E/AndroidRuntime(2246): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.medusa.checkit/com.medusa.checkit.NewChecklistActivity}: java.lang.NullPointerException
01-04 18:49:09.140: E/AndroidRuntime(2246): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1956)
01-04 18:49:09.140: E/AndroidRuntime(2246): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1981)
01-04 18:49:09.140: E/AndroidRuntime(2246): at android.app.ActivityThread.access$600(ActivityThread.java:123)
01-04 18:49:09.140: E/AndroidRuntime(2246): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1147)
01-04 18:49:09.140: E/AndroidRuntime(2246): at android.os.Handler.dispatchMessage(Handler.java:99)
01-04 18:49:09.140: E/AndroidRuntime(2246): at android.os.Looper.loop(Looper.java:137)
01-04 18:49:09.140: E/AndroidRuntime(2246): at android.app.ActivityThread.main(ActivityThread.java:4424)
01-04 18:49:09.140: E/AndroidRuntime(2246): at java.lang.reflect.Method.invokeNative(Native Method)
01-04 18:49:09.140: E/AndroidRuntime(2246): at java.lang.reflect.Method.invoke(Method.java:511)
01-04 18:49:09.140: E/AndroidRuntime(2246): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
01-04 18:49:09.140: E/AndroidRuntime(2246): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
01-04 18:49:09.140: E/AndroidRuntime(2246): at dalvik.system.NativeStart.main(Native Method)
01-04 18:49:09.140: E/AndroidRuntime(2246): Caused by: java.lang.NullPointerException
01-04 18:49:09.140: E/AndroidRuntime(2246): at com.medusa.checkit.NewChecklistActivity.onCreate(NewChecklistActivity.java:39)
01-04 18:49:09.140: E/AndroidRuntime(2246): at android.app.Activity.performCreate(Activity.java:4470)
01-04 18:49:09.140: E/AndroidRuntime(2246): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049)
01-04 18:49:09.140: E/AndroidRuntime(2246): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1920)
01-04 18:49:09.140: E/AndroidRuntime(2246): ... 11 moreStack Overflow用户
发布于 2014-01-05 02:22:07
可以使用创建单例类传递值
public class ShareData{
private volatile static ShareData shareData;
public static ShareData data(){
if(shareData == null){
synchronized (ShareData.class) {
if (shareData == null) {
shareData = new ShareData();
}
}
}
return shareData;
}
public ArrayList<String[]> arrayList;
}活动1中的设定值
ShareData.data().arrayList = new ArrayList<String[]>();
ShareData.data().arrayList.add(strarray);在活动2中获得值
public ArrayList<String[]> myArray = ShareData.data().arrayList;页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/20929248
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