使用actionbarsherlock庫的Android ClassNotFoundException

Question

嘗試在模擬器上運行項目時，我不斷收到classnotfoundexception。 在發布此問題之前，我已經環顧四周，我曾嘗試將庫添加到構建路徑，清理/構建項目，但仍未解決問題。

該項目是使用開源日歷項目構建的。 所以這個名字很奇怪，但是對構建沒有任何影響。

這是LogCat：

09-03 12:37:36.990: E/Trace(2272): error opening trace file: No such file or directory (2)
09-03 12:37:37.439: W/dalvikvm(2272): Unable to resolve superclass of Lcom/squareup/timessquare/sample/DashboardActivity; (453)
09-03 12:37:37.482: W/dalvikvm(2272): Link of class 'Lcom/squareup/timessquare/sample/DashboardActivity;' failed
09-03 12:37:37.482: D/AndroidRuntime(2272): Shutting down VM
09-03 12:37:37.482: W/dalvikvm(2272): threadid=1: thread exiting with uncaught exception (group=0x40a13300)
09-03 12:37:37.540: E/AndroidRuntime(2272): FATAL EXCEPTION: main
09-03 12:37:37.540: E/AndroidRuntime(2272): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.squareup.timessquare.sample/com.squareup.timessquare.sample.DashboardActivity}: java.lang.ClassNotFoundException: com.squareup.timessquare.sample.DashboardActivity
09-03 12:37:37.540: E/AndroidRuntime(2272):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1983)
09-03 12:37:37.540: E/AndroidRuntime(2272):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2084)
09-03 12:37:37.540: E/AndroidRuntime(2272):     at android.app.ActivityThread.access$600(ActivityThread.java:130)
09-03 12:37:37.540: E/AndroidRuntime(2272):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1195)
09-03 12:37:37.540: E/AndroidRuntime(2272):     at android.os.Handler.dispatchMessage(Handler.java:99)
09-03 12:37:37.540: E/AndroidRuntime(2272):     at android.os.Looper.loop(Looper.java:137)
09-03 12:37:37.540: E/AndroidRuntime(2272):     at android.app.ActivityThread.main(ActivityThread.java:4745)
09-03 12:37:37.540: E/AndroidRuntime(2272):     at java.lang.reflect.Method.invokeNative(Native Method)
09-03 12:37:37.540: E/AndroidRuntime(2272):     at java.lang.reflect.Method.invoke(Method.java:511)
09-03 12:37:37.540: E/AndroidRuntime(2272):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
09-03 12:37:37.540: E/AndroidRuntime(2272):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
09-03 12:37:37.540: E/AndroidRuntime(2272):     at dalvik.system.NativeStart.main(Native Method)
09-03 12:37:37.540: E/AndroidRuntime(2272): Caused by: java.lang.ClassNotFoundException: com.squareup.timessquare.sample.DashboardActivity
09-03 12:37:37.540: E/AndroidRuntime(2272):     at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:61)
09-03 12:37:37.540: E/AndroidRuntime(2272):     at java.lang.ClassLoader.loadClass(ClassLoader.java:501)
09-03 12:37:37.540: E/AndroidRuntime(2272):     at java.lang.ClassLoader.loadClass(ClassLoader.java:461)
09-03 12:37:37.540: E/AndroidRuntime(2272):     at android.app.Instrumentation.newActivity(Instrumentation.java:1053)
09-03 12:37:37.540: E/AndroidRuntime(2272):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1974)

這是清單中聲明的​​類：

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.squareup.timessquare.sample"
    android:versionCode="1"
    android:versionName="1.0">

        <uses-sdk
        android:minSdkVersion="7"
        android:targetSdkVersion="17" />


    <application
        android:label="@string/app_name"
        android:icon="@drawable/supporticon"
        android:debuggable="true"
        android:supportsRtl="true">

        <activity
            android:name=".DashboardActivity"
            android:label="@string/app_name"
            android:configChanges="orientation|screenSize|keyboardHidden"
            >

            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

這是課程內容：

public class DashboardActivity extends SherlockFragmentActivity {

    ActionBar mActionBar;
    ViewPager mPager;
    Tab tab;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.dashboard);

        // Activate the navigation mode tabs
        mActionBar = getSupportActionBar();
        mActionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);

        // Locate the view pager in dashboard.xml
        mPager = (ViewPager) findViewById(R.id.pager);

        // Activate the fragment manager
        FragmentManager fm = getSupportFragmentManager();

        // Capture view pager swipes
        ViewPager.SimpleOnPageChangeListener ViewPagerListener = new ViewPager.SimpleOnPageChangeListener() {
            @Override
            public void onPageSelected(int position) {
                super.onPageSelected(position);
                // Find the view pager position
                mActionBar.setSelectedNavigationItem(position);
            }
        };

        mPager.setOnPageChangeListener(ViewPagerListener);
        // Locate the adapter class
        ViewPagerAdapter viewpageradapter = new ViewPagerAdapter(fm);
        // Set the view pager adapter in ViewPager
        mPager.setAdapter(viewpageradapter);

        // Capture the button clicks
        ActionBar.TabListener tabListener = new ActionBar.TabListener() {

            @Override
            public void onTabUnselected(Tab tab, FragmentTransaction ft) {
                // Pass the position on tab click to view pager
                mPager.setCurrentItem(tab.getPosition());

            }

            @Override
            public void onTabSelected(Tab tab, FragmentTransaction ft) {
                // TODO Auto-generated method stub

            }

            @Override
            public void onTabReselected(Tab tab, FragmentTransaction ft) {
                // TODO Auto-generated method stub

            }
        };

        // Create the first tab
        tab = mActionBar.newTab().setText("Support Tab")
                .setTabListener(tabListener);
        mActionBar.addTab(tab);

        // Create the second tab
        tab = mActionBar.newTab().setText("Students Tab")
                .setTabListener(tabListener);
        mActionBar.addTab(tab);

    }

}

我能想到的唯一問題是，當我右鍵單擊我的項目>項目屬性> Android時，actionbarsherlock參考旁邊有一個紅叉。 即使在使用該庫的類中沒有錯誤，我也不知道這是否與它有關。

任何幫助，將不勝感激，謝謝。

Answer 1

我能想到的唯一問題是，當我右鍵單擊我的項目>項目屬性> Android時，actionbarsherlock參考旁邊有一個紅叉。 即使在使用該庫的類中沒有錯誤，我也不知道這是否與它有關。

是的，這肯定與它有關。 這意味着您的項目無法找到jar文件或lib項目的位置。

在項目屬性頁面的該條目上，按編輯按鈕，然后再次導航到jar文件/ lib項目文件夾。 只有當紅色x變成綠色復選標記時，您才能正確運行程序。