Android Studio:ClassNotFoundException [英] Android Studio: ClassNotFoundException
本文介绍了Android Studio:ClassNotFoundException的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我忙于我的应用程序一个多星期，突然:
i was busy with my app for over a week, when suddenly:
11-12 07:59:17.860 1653-1653/nl.test.myapp E/AndroidRuntime﹕ FATAL EXCEPTION: main
java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{nl.test.MyApp/nl.test.MyApp.MainActivity}: java.lang.ClassNotFoundException: Didn't find class "nl.test.myapp.MainActivity" on path: DexPathList[[zip file "/data/app/nl.test.myapp-2.apk"],nativeLibraryDirectories=[/data/app-lib/nl.test.myapp-2, /system/lib]]
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2137)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2261)
at android.app.ActivityThread.access$600(ActivityThread.java:141)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1256)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:5103)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:525)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.ClassNotFoundException: Didn't find class "nl.test.myapp.MainActivity" on path: DexPathList[[zip file "/data/app/nl.test.MyApp-2.apk"],nativeLibraryDirectories=[/data/app-lib/nl.test.MyApp-2, /system/lib]]
at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:53)
at java.lang.ClassLoader.loadClass(ClassLoader.java:501)
at java.lang.ClassLoader.loadClass(ClassLoader.java:461)
at android.app.Instrumentation.newActivity(Instrumentation.java:1061)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2128)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2261)
at android.app.ActivityThread.access$600(ActivityThread.java:141)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1256)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:5103)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:525)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
at dalvik.system.NativeStart.main(Native Method)
这是我的 AndroidManifest.xml:
here is my AndroidManifest.xml:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="nl.test.myapp"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="7"
android:targetSdkVersion="19" />
<uses-permission android:name="android.permission.INTERNET" />
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="nl.test.myapp.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>
<activity android:name=".welcomewizard.WelcomeWizardIntroPage"
android:label="@string/app_name" />
<activity android:name=".welcomewizard.WelcomeWizardPage1"
android:label="@string/app_name" />
<activity android:name=".welcomewizard.WelcomeWizardPage2"
android:label="@string/app_name" />
<activity android:name=".welcomewizard.WelcomeWizardPage3"
android:label="@string/app_name" />
<activity android:name=".welcomewizard.WelcomeWizardPage4"
android:label="@string/app_name" />
<activity android:name=".welcomewizard.WelcomeWizardFinishPage"
android:label="@string/app_name" />
<activity android:name=".CompanySelectorActivity"
android:label="@string/compsel_actionbarlabel" />
</application>
</manifest>
这是在我的 R.java 出现一些问题之后发生的(视图的 id 不正确)，在重建项目后发生了这个问题
this was happening after some problems with my R.java (the id's for the views where incorrect), after rebuilding the project this problem happend
我已经在 IDE 文件菜单中尝试了 Invalidate Cashes/restart
i've already tried the Invalidate Cashes/restart in the IDE File-menu
更新 14:51:这是我的 compiler.xml 文件:
Update 14:51: this is my compiler.xml file:
<?xml version="1.0" encoding="UTF-8"?>
<project version="4">
<component name="CompilerConfiguration">
<option name="DEFAULT_COMPILER" value="Javac" />
<resourceExtensions />
<wildcardResourcePatterns>
<entry name="!?*.java" />
<entry name="!?*.form" />
<entry name="!?*.class" />
<entry name="!?*.groovy" />
<entry name="!?*.scala" />
<entry name="!?*.flex" />
<entry name="!?*.kt" />
<entry name="!?*.clj" />
</wildcardResourcePatterns>
<annotationProcessing>
<profile default="true" name="Default" enabled="false">
<processorPath useClasspath="true" />
</profile>
</annotationProcessing>
</component>
</project>
我的 MainActivity.java 文件 (\src\main\java\nl\test\myapp\MainActivity.java):
My MainActivity.java file (\src\main\java\nl\test\myapp\MainActivity.java) :
package nl.test.myapp;
import android.annotation.TargetApi;
import android.content.Intent;
import android.os.Build;
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.view.Menu;
import android.widget.RelativeLayout;
import nl.test.myapp.welcomewizard.WelcomeWizardIntroPage;
public class MainActivity extends ActionBarActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
setBackground(R.drawable.background_grey);
Intent intent = new Intent(this, WelcomeWizardIntroPage.class);
startActivity(intent);
finish();
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
@TargetApi(Build.VERSION_CODES.JELLY_BEAN)
private void setBackground(int drawable){
int currentApiVersion = android.os.Build.VERSION.SDK_INT;
if(currentApiVersion >= android.os.Build.VERSION_CODES.JELLY_BEAN){
RelativeLayout layout = (RelativeLayout) findViewById(R.id.layout_main);
layout.setBackground(getResources().getDrawable(drawable));
}
}
}
推荐答案
我在 Android Studio 中创建了一个新项目，并将旧项目中的所有内容复制到新项目中.现在它又可以工作了，无需对代码进行任何 (!) 修改.
I created a new project in Android studio and copied everything from the old project into the new one. Now it's working again, without any(!) modifications to the code.
这篇关于Android Studio:ClassNotFoundException的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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