我試圖用簡單框架從nasa rss(我正在關注Android HeadFirst book)中獲取一些數據。 我面臨的問題是應用程序在主活動加載時自動關閉。Android意外關機
下面是代碼:
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
try {
print();
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
,這裏是打印方法:
public void print() throws Exception
{
Rss rss = new Rss();
Serializer serializer = new Persister();
File source = new File("http://www.nasa.gov/rss/dyn/image_of_the_day.rss");
serializer.read(rss, source);
TextView text = (TextView) this.findViewById(R.id.imageTitle);
text.setText(rss.channel.title);
}
的logcat:
> 12-11 18:27:03.459: D/AndroidRuntime(20621): Shutting down VM
12-11 18:27:03.459: W/dalvikvm(20621): threadid=1: thread exiting with uncaught exception (group=0x400205a0)
12-11 18:27:03.469: E/AndroidRuntime(20621): FATAL EXCEPTION: main
12-11 18:27:03.469: E/AndroidRuntime(20621): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.example.nasadailyimage/com.example.nasadailyimage.MainActivity}: java.lang.ClassNotFoundException: com.example.nasadailyimage.MainActivity in loader dalvik.system.PathClassLoader[/data/app/com.example.nasadailyimage-1.apk]
12-11 18:27:03.469: E/AndroidRuntime(20621): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1743)
12-11 18:27:03.469: E/AndroidRuntime(20621): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1851)
12-11 18:27:03.469: E/AndroidRuntime(20621): at android.app.ActivityThread.access$1500(ActivityThread.java:132)
12-11 18:27:03.469: E/AndroidRuntime(20621): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1038)
12-11 18:27:03.469: E/AndroidRuntime(20621): at android.os.Handler.dispatchMessage(Handler.java:99)
12-11 18:27:03.469: E/AndroidRuntime(20621): at android.os.Looper.loop(Looper.java:150)
12-11 18:27:03.469: E/AndroidRuntime(20621): at android.app.ActivityThread.main(ActivityThread.java:4277)
12-11 18:27:03.469: E/AndroidRuntime(20621): at java.lang.reflect.Method.invokeNative(Native Method)
12-11 18:27:03.469: E/AndroidRuntime(20621): at java.lang.reflect.Method.invoke(Method.java:507)
12-11 18:27:03.469: E/AndroidRuntime(20621): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
12-11 18:27:03.469: E/AndroidRuntime(20621): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
12-11 18:27:03.469: E/AndroidRuntime(20621): at dalvik.system.NativeStart.main(Native Method)
12-11 18:27:03.469: E/AndroidRuntime(20621): Caused by: java.lang.ClassNotFoundException: com.example.nasadailyimage.MainActivity in loader dalvik.system.PathClassLoader[/data/app/com.example.nasadailyimage-1.apk]
12-11 18:27:03.469: E/AndroidRuntime(20621): at dalvik.system.PathClassLoader.findClass(PathClassLoader.java:240)
12-11 18:27:03.469: E/AndroidRuntime(20621): at java.lang.ClassLoader.loadClass(ClassLoader.java:551)
12-11 18:27:03.469: E/AndroidRuntime(20621): at java.lang.ClassLoader.loadClass(ClassLoader.java:511)
12-11 18:27:03.469: E/AndroidRuntime(20621): at android.app.Instrumentation.newActivity(Instrumentation.java:1040)
12-11 18:27:03.469: E/AndroidRuntime(20621): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1735)
12-11 18:27:03.469: E/AndroidRuntime(20621): ... 11 more
這裏是清單文件
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.nasadailyimage"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="18" />
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="com.example.nasadailyimage.MainActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
我創建了一個全新的android項目。和它的作品
不過即使我刪除所有我增加了庫(simple.org),如果我註釋掉我在MainActivity.java已經添加了一切仍然使應用程序關閉
我已經能夠觀察到該行:
Serializer serialezer = new Persister();
導致該錯誤。該框架是否簡單用於android應用程序?它通常會導致這類錯誤嗎?
更新
我也曾嘗試不同版本的罐子。 無似乎工作
關閉Eclipse不幫助任何
當串行線評論出
logcat stacktrace怎麼樣? – vandus
您可以發佈完整的堆棧跟蹤嗎? –
@vandus。科林弗林抱歉,遲到的迴應。我不得不更新我的插件,以獲得logcat。它現在在這裏 – Bula