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问题:
I've an activity WelcomeActivity.java in which theres a button bContinue. In the OnClick method of the button, I tried this..
startActivity(new Intent(this, MenuItemDetailActivity.class)); //startActivity(new Intent("com.resto.demo.activity.MENUITEMLISTACTIVITY"));
neither of the above 2 lines work. instead they give me NullPointerException & the program ends abruptly..I cant find the problem.. is the problem in manifest or my call?
<activity android:name="com.resto.demo.activity.MenuItemListActivity" android:label="@string/title_menuitem_list" > <intent-filter> <action android:name="com.resto.demo.activity.MENUITEMLISTACTIVITY" /> <category android:name="android.intent.category.DEFAULT" /> </intent-filter> </activity>
MenuItemListActivity is the part of master/detail flow. Thanx you. Also tell me if my problem is not understood. Any help/suggestion is welcome :)
回答1:
Edit your manifest
<application <activity android:name="com.resto.demo.activity.MenuItemListActivity" android:label="@string/title_menuitem_list" > <intent-filter> <action android:name="com.resto.demo.activity.MENUITEMLISTACTIVITY" /> <category android:name="android.intent.category.DEFAULT" /> </intent-filter> </activity> <activity android:name="com.resto.demo.activity.MenuItemDetailActivity"/> </application>
And add this to OnClick event
startActivity(new Intent(MenuItemListActivity.this, MenuItemDetailActivity.class));
回答2:
The first thing I would do is make sure MenuItemDetailActivity is in the AndroidManifest as well (instead of just MenuItemListActivity)
<activity android:name="com.resto.demo.activity.MenuItemDetailActivity" android:label="..." > </activity>
However, this does not normally throw a NullPointerException. Can you post the error message/stack trace for the NullPointerException? Also, it would be great to post the lines of code that the NullPointerException references.
翻译