Android 跳转到下一个活动时出错

AndroidManifest.xml

Friends.java
Intent intent = new Intent(Friends.this,MyMapActivity.class);
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
startActivityForResult(intent,0);

我不知道为什么会出现这个错误。我也尝试过startActivity（newintent（Friend.this，MyMapActivity.class））； 即使我犯了这样的错误

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我也在Manifestfile中声明了该类。

在menifest中添加您的活动

04-30 11:38:53.165: ERROR/AndroidRuntime(822): FATAL EXCEPTION: main
04-30 11:38:53.165: ERROR/AndroidRuntime(822): java.lang.NoClassDefFoundError: com.bestdambikers.MyMapActivity
04-30 11:38:53.165: ERROR/AndroidRuntime(822): at com.bestdambikers.Friends$5.onClick(Friends.java:793)
04-30 11:38:53.165: ERROR/AndroidRuntime(822): at android.view.View.performClick(View.java:2485)
04-30 11:38:53.165: ERROR/AndroidRuntime(822): at android.view.View$PerformClick.run(View.java:9080)
04-30 11:38:53.165: ERROR/AndroidRuntime(822): at android.os.Handler.handleCallback(Handler.java:587)
04-30 11:38:53.165: ERROR/AndroidRuntime(822): at android.os.Handler.dispatchMessage(Handler.java:92)
04-30 11:38:53.165: ERROR/AndroidRuntime(822): at android.os.Looper.loop(Looper.java:123)
04-30 11:38:53.165: ERROR/AndroidRuntime(822): at android.app.ActivityThread.main(ActivityThread.java:3647)
04-30 11:38:53.165: ERROR/AndroidRuntime(822): at java.lang.reflect.Method.invokeNative(Native Method)
04-30 11:38:53.165: ERROR/AndroidRuntime(822): at java.lang.reflect.Method.invoke(Method.java:507)
04-30 11:38:53.165: ERROR/AndroidRuntime(822): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
04-30 11:38:53.165: ERROR/AndroidRuntime(822): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
04-30 11:38:53.165: ERROR/AndroidRuntime(822): at dalvik.system.NativeStart.main(Native Method)
04-30 11:38:53.165: ERROR/AndroidRuntime(822): Caused by: java.lang.IllegalAccessError: Class ref in pre-verified class resolved to unexpected implementation
04-30 11:38:53.165: ERROR/AndroidRuntime(822): at dalvik.system.DexFile.defineClass(Native Method)
04-30 11:38:53.165: ERROR/AndroidRuntime(822): at dalvik.system.DexFile.loadClassBinaryName(DexFile.java:207)
04-30 11:38:53.165: ERROR/AndroidRuntime(822): at dalvik.system.PathClassLoader.findClass(PathClassLoader.java:200)
04-30 11:38:53.165: ERROR/AndroidRuntime(822): at java.lang.ClassLoader.loadClass(ClassLoader.java:551)
04-30 11:38:53.165: ERROR/AndroidRuntime(822): at java.lang.ClassLoader.loadClass(ClassLoader.java:511)
04-30 11:38:53.165: ERROR/AndroidRuntime(822): ... 12 more

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在清单中，您有MYMapActivity，而在代码MYMapActivity中，字符“y”和“y”是不同的…=）

意图=新的 意图（Friends.this、MyMapActivity.class）

及

活动 android:name=“.MYMapActivity”

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类的名称不同…在任何地方更改为MyMapActivity…

清理项目，然后重新编译它。

我想答案已经在您的日志中了。您是否在AndroidManifest.xmlYa中声明了此活动，我知道它区分大小写。我检查过，但文件名正确。04-30 11:38:53.165:ERROR/AndroidRuntime（822）：java.lang.NoClassDefFoundError:com.bestdambikers.MyMapActivity。也许您的类名是MYMapActivity而不是MYMapActivity

04-30 11:38:53.165: ERROR/AndroidRuntime(822): FATAL EXCEPTION: main
04-30 11:38:53.165: ERROR/AndroidRuntime(822): java.lang.NoClassDefFoundError: com.bestdambikers.MyMapActivity
04-30 11:38:53.165: ERROR/AndroidRuntime(822): at com.bestdambikers.Friends$5.onClick(Friends.java:793)
04-30 11:38:53.165: ERROR/AndroidRuntime(822): at android.view.View.performClick(View.java:2485)
04-30 11:38:53.165: ERROR/AndroidRuntime(822): at android.view.View$PerformClick.run(View.java:9080)
04-30 11:38:53.165: ERROR/AndroidRuntime(822): at android.os.Handler.handleCallback(Handler.java:587)
04-30 11:38:53.165: ERROR/AndroidRuntime(822): at android.os.Handler.dispatchMessage(Handler.java:92)
04-30 11:38:53.165: ERROR/AndroidRuntime(822): at android.os.Looper.loop(Looper.java:123)
04-30 11:38:53.165: ERROR/AndroidRuntime(822): at android.app.ActivityThread.main(ActivityThread.java:3647)
04-30 11:38:53.165: ERROR/AndroidRuntime(822): at java.lang.reflect.Method.invokeNative(Native Method)
04-30 11:38:53.165: ERROR/AndroidRuntime(822): at java.lang.reflect.Method.invoke(Method.java:507)
04-30 11:38:53.165: ERROR/AndroidRuntime(822): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
04-30 11:38:53.165: ERROR/AndroidRuntime(822): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
04-30 11:38:53.165: ERROR/AndroidRuntime(822): at dalvik.system.NativeStart.main(Native Method)
04-30 11:38:53.165: ERROR/AndroidRuntime(822): Caused by: java.lang.IllegalAccessError: Class ref in pre-verified class resolved to unexpected implementation
04-30 11:38:53.165: ERROR/AndroidRuntime(822): at dalvik.system.DexFile.defineClass(Native Method)
04-30 11:38:53.165: ERROR/AndroidRuntime(822): at dalvik.system.DexFile.loadClassBinaryName(DexFile.java:207)
04-30 11:38:53.165: ERROR/AndroidRuntime(822): at dalvik.system.PathClassLoader.findClass(PathClassLoader.java:200)
04-30 11:38:53.165: ERROR/AndroidRuntime(822): at java.lang.ClassLoader.loadClass(ClassLoader.java:551)
04-30 11:38:53.165: ERROR/AndroidRuntime(822): at java.lang.ClassLoader.loadClass(ClassLoader.java:511)
04-30 11:38:53.165: ERROR/AndroidRuntime(822): ... 12 more

<activity android:name="MapActivity" ></activity>