路徑中沒有找到類「edu.stanford.cs231m.HelloAndroidActivity」：DexPathList

我試圖根據斯坦福大學移動計算機視覺課程http://web.stanford.edu/class/cs231m/實施「HelloAndroid」。我遇到了「ClassNotFoundException」問題。它在Android模擬器上說：「不幸的是，HelloAndroid已經停止。」在Eclipse中的logcat顯示以下內容：路徑中沒有找到類「edu.stanford.cs231m.HelloAndroidActivity」：DexPathList

04-17 22:28:47.180: D/AndroidRuntime(2036): Shutting down VM 
04-17 22:28:47.180: D/AndroidRuntime(2036): --------- beginning of crash 
04-17 22:28:47.180: E/AndroidRuntime(2036): FATAL EXCEPTION: main 
04-17 22:28:47.180: E/AndroidRuntime(2036): Process: edu.stanford.cs231m, PID: 2036 
04-17 22:28:47.180: E/AndroidRuntime(2036): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{edu.stanford.cs231m/edu.stanford.cs231m.HelloAndroidActivity}: java.lang.ClassNotFoundException: Didn't find class "edu.stanford.cs231m.HelloAndroidActivity" on path: DexPathList[[zip file "/data/app/edu.stanford.cs231m-1/base.apk"],nativeLibraryDirectories=[/vendor/lib64, /system/lib64]] 
04-17 22:28:47.180: E/AndroidRuntime(2036):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2209) 
04-17 22:28:47.180: E/AndroidRuntime(2036):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2360) 
04-17 22:28:47.180: E/AndroidRuntime(2036):  at android.app.ActivityThread.access$800(ActivityThread.java:144) 
04-17 22:28:47.180: E/AndroidRuntime(2036):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1278) 
04-17 22:28:47.180: E/AndroidRuntime(2036):  at android.os.Handler.dispatchMessage(Handler.java:102) 
04-17 22:28:47.180: E/AndroidRuntime(2036):  at android.os.Looper.loop(Looper.java:135) 
04-17 22:28:47.180: E/AndroidRuntime(2036):  at android.app.ActivityThread.main(ActivityThread.java:5221) 
04-17 22:28:47.180: E/AndroidRuntime(2036):  at java.lang.reflect.Method.invoke(Native Method) 
04-17 22:28:47.180: E/AndroidRuntime(2036):  at java.lang.reflect.Method.invoke(Method.java:372) 
04-17 22:28:47.180: E/AndroidRuntime(2036):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899) 
04-17 22:28:47.180: E/AndroidRuntime(2036):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694) 
04-17 22:28:47.180: E/AndroidRuntime(2036): Caused by: java.lang.ClassNotFoundException: Didn't find class "edu.stanford.cs231m.HelloAndroidActivity" on path: DexPathList[[zip file "/data/app/edu.stanford.cs231m-1/base.apk"],nativeLibraryDirectories=[/vendor/lib64, /system/lib64]] 
04-17 22:28:47.180: E/AndroidRuntime(2036):  at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:56) 
04-17 22:28:47.180: E/AndroidRuntime(2036):  at java.lang.ClassLoader.loadClass(ClassLoader.java:511) 
04-17 22:28:47.180: E/AndroidRuntime(2036):  at java.lang.ClassLoader.loadClass(ClassLoader.java:469) 
04-17 22:28:47.180: E/AndroidRuntime(2036):  at android.app.Instrumentation.newActivity(Instrumentation.java:1065) 
04-17 22:28:47.180: E/AndroidRuntime(2036):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2199) 
04-17 22:28:47.180: E/AndroidRuntime(2036):  ... 10 more 
04-17 22:28:47.180: E/AndroidRuntime(2036):  Suppressed: java.lang.ClassNotFoundException: edu.stanford.cs231m.HelloAndroidActivity 
04-17 22:28:47.180: E/AndroidRuntime(2036):   at java.lang.Class.classForName(Native Method) 
04-17 22:28:47.180: E/AndroidRuntime(2036):   at java.lang.BootClassLoader.findClass(ClassLoader.java:781) 
04-17 22:28:47.180: E/AndroidRuntime(2036):   at java.lang.BootClassLoader.loadClass(ClassLoader.java:841) 
04-17 22:28:47.180: E/AndroidRuntime(2036):   at java.lang.ClassLoader.loadClass(ClassLoader.java:504) 
04-17 22:28:47.180: E/AndroidRuntime(2036):   ... 13 more 
04-17 22:28:47.180: E/AndroidRuntime(2036):  Caused by: java.lang.NoClassDefFoundError: Class not found using the boot class loader; no stack available

僅供參考，java代碼是

package edu.stanford.cs231m.helloandroid; 
import android.widget.TextView; 
import android.app.Activity; 
import android.os.Bundle; 
public class HelloAndroidActivity extends Activity { 
    @Override 
    protected void onCreate(Bundle savedInstanceState) { 

     TextView txtView = new TextView(this); 
     txtView.setText("Hello czAndroid!"); 
     setContentView(txtView); 

     super.onCreate(savedInstanceState); 
    } 
}

而且manifest.xml的是

<manifest xmlns:android="http://schemas.android.com/apk/res/android" 
package="edu.stanford.cs231m" 
android:versionCode="1" 
android:versionName="1.0" > 

<uses-sdk 
    android:minSdkVersion="21" 
    android:targetSdkVersion="21" /> 

<application 
    android:allowBackup="true" 
    android:icon="@drawable/ic_launcher" 
    android:label="@string/app_name" 
    android:theme="@style/AppTheme" > 

    <activity 
     android:name="HelloAndroidActivity" 
     android:label="@string/app_name" 
     android:screenOrientation="landscape"> 
     <intent-filter> 
      <category android:name="android.intent.category.LAUNCHER"/> 
      <action android:name="android.intent.action.MAIN"/> 
     </intent-filter> 
    </activity> 

</application> 

</manifest>

項目窗口就像

模擬器的詳細信息如下，如果有關係：

和Java構建路徑是

我已經爲此工作了幾乎一天，並試圖像加一個圓點，以「HelloAndroidActivity」，選擇Java的所有項目的方法建設路徑等，但這些都不起作用。

來源

2017-04-18 Z Cao

事實證明，我的manifest.xml包名稱寫入不正確。我寫

package="edu.stanford.cs231m"

正確的應該是

package="edu.stanford.cs231m.helloandroid"

而且問題得到解決。

來源

2017-04-19 01:24:01

路徑中沒有找到類「edu.stanford.cs231m.HelloAndroidActivity」：DexPathList

回答

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