Android NewsReader演示项目问题

Question

I downloaded the android demo newsreader project from here and imported it into eclipse using the Import > Existing Projects Into Workspace. I also added the android-support-v4.jar to the build path like it says here

The problem I am getting is something to do with accessing resources. here are the errors I get.

Description Resource    Path    Location    Type
ReaderTutorial/src/com/example/android/newsreader   line 143    Java Problem
android.app.ActionBar cannot be resolved to a variable  NewsReaderActivity.java     /NewsReaderTutorial/src/com/example/android/newsreader  line 151    Java Problem
error: Error retrieving parent for item: No resource found that matches the given name 'android:style/Widget.Holo.Light.ActionBar.TabView'. style.xml   /NewsReaderTutorial/res/values-v11  line 23 Android AAPT Problem
error: Error retrieving parent for item: No resource found that matches the given name 'android:Theme.Holo.Light.NoActionBar'.  style.xml   /NewsReaderTutorial/res/values-v11  line 33 Android AAPT Problem
error: Error retrieving parent for item: No resource found that matches the given name 'android:Theme.Holo.Light'.  style.xml   /NewsReaderTutorial/res/values-v11  line 28 Android AAPT Problem
error: Error: No resource found that matches the given name: attr 'android:actionBarTabStyle'.  style.xml   /NewsReaderTutorial/res/values-v11  line 30 Android AAPT Problem
error: Error: No resource found that matches the given name: attr 'android:actionBarTabTextStyle'.  style.xml   /NewsReaderTutorial/res/values-v11  line 29 Android AAPT Problem
FragmentTransaction cannot be resolved to a type    CompatActionBarNavHandler.java  /NewsReaderTutorial/src/com/example/android/newsreader  line 54 Java Problem
FragmentTransaction cannot be resolved to a type    CompatActionBarNavHandler.java  /NewsReaderTutorial/src/com/example/android/newsreader  line 76 Java Problem
FragmentTransaction cannot be resolved to a type    CompatActionBarNavHandler.java  /NewsReaderTutorial/src/com/example/android/newsreader  line 84 Java Problem
OnNavigationListener cannot be resolved to a type   CompatActionBarNavHandler.java  /NewsReaderTutorial/src/com/example/android/newsreader  line 35 Java Problem
R cannot be resolved to a variable  ArticleActivity.java    /NewsReaderTutorial/src/com/example/android/newsreader  line 51 Java Problem
R cannot be resolved to a variable  HeadlinesFragment.java  /NewsReaderTutorial/src/com/example/android/newsreader  line 75 Java Problem
R cannot be resolved to a variable  NewsReaderActivity.java /NewsReaderTutorial/src/com/example/android/newsreader  line 76 Java Problem
R cannot be resolved to a variable  NewsReaderActivity.java /NewsReaderTutorial/src/com/example/android/newsreader  line 80 Java Problem
R cannot be resolved to a variable  NewsReaderActivity.java /NewsReaderTutorial/src/com/example/android/newsreader  line 82 Java Problem
R cannot be resolved to a variable  NewsReaderActivity.java /NewsReaderTutorial/src/com/example/android/newsreader  line 86 Java Problem
R cannot be resolved to a variable  NewsReaderActivity.java /NewsReaderTutorial/src/com/example/android/newsreader  line 101    Java Problem
R cannot be resolved to a variable  NewsReaderActivity.java /NewsReaderTutorial/src/com/example/android/newsreader  line 152    Java Problem
R cannot be resolved to a variable  NewsReaderActivity.java /NewsReaderTutorial/src/com/example/android/newsreader  line 183    Java Problem
Tab cannot be resolved to a type    CompatActionBarNavHandler.java  /NewsReaderTutorial/src/com/example/android/newsreader  line 54 Java Problem
Tab cannot be resolved to a type    CompatActionBarNavHandler.java  /NewsReaderTutorial/src/com/example/android/newsreader  line 76 Java Problem
Tab cannot be resolved to a type    CompatActionBarNavHandler.java  /NewsReaderTutorial/src/com/example/android/newsreader  line 84 Java Problem
TabListener cannot be resolved to a type    CompatActionBarNavHandler.java  /NewsReaderTutorial/src/com/example/android/newsreader  line 35 Java Problem
The import android.app.ActionBar cannot be resolved CompatActionBarNavHandler.java  /NewsReaderTutorial/src/com/example/android/newsreader  line 19 Java Problem
The import android.app.ActionBar cannot be resolved CompatActionBarNavHandler.java  /NewsReaderTutorial/src/com/example/android/newsreader  line 20 Java Problem
The import android.app.ActionBar cannot be resolved CompatActionBarNavHandler.java  /NewsReaderTutorial/src/com/example/android/newsreader  line 21 Java Problem
The import android.app.FragmentTransaction cannot be resolved   CompatActionBarNavHandler.java  /NewsReaderTutorial/src/com/example/android/newsreader  line 22 Java Problem
The method getActionBar() is undefined for the type NewsReaderActivity  NewsReaderActivity.java /NewsReaderTutorial/src/com/example/android/newsreader  line 137    Java Problem
The method onNavigationItemSelected(int, long) of type CompatActionBarNavHandler must override or implement a supertype method  CompatActionBarNavHandler.java  /NewsReaderTutorial/src/com/example/android/newsreader  line 65 Java Problem

I know it's not a lot to go on but I have been searching around and couldn't find anything as its quite a new demo.

I think it could be that the R.java file is not being generated as I can't find it in my gen directory. I have tried cleaning the project and restarting eclipse but they didnt work.

Any help would be grand.

Disco

Answer 1

Its been a while but this fixed the problem for me.
Did you import:

import android.app.ActionBar;

for some reason my project had:

import android.app.ActionBar.Tab;
import android.app.ActionBar.TabListener;

import android.app.ActionBar; and it worked.

Answer 2

您需要将构建目标更改为API Level 11或更高。

Answer 3

您需要单击Android Manifest.xml文件下的项目属性文件，然后将目标从8更改为目标13或更高。