Android 显式 Intent 抛出 NoClassDefFound 错误
我正在尝试使用明确的意图在我的 Android 应用程序中显示 MapView。虽然我没有发现我的代码有任何问题，但当我尝试启动我的活动时，我不断收到“NoClassDefFoundError”。 基本上，从我的主要活动 (SetCriteria) 中，当用户按下按钮时，我会创建明确的意图：
Log.i(TAG, "Showing map..");
try{
Intent intentMap = new Intent(view.getContext(), AddLocation.class);
startActivity(intentMap);
}catch(Throwable ex) {
Log.e(TAG, "Error occured while trying to display map", ex);
}
我的 LogCat 显示：
java.lang.NoClassDefFoundError: com.adm.AddLocation
...
Caused by: java.lang.IllegalAccessError: Class ref in pre-verified class resolved to unexpected implementation
我的清单如下所示：
<application android:label="@string/app_name" android:icon="@drawable/ic_launcher_red">
<uses-library android:name="com.google.android.maps"/>
<activity android:name=".SetCriteria"
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=".AddLocation"
android:label="@string/add_location">
</activity>
</application>
我只有一个包：com.adm。那么可能出了什么问题呢？我使用 Intent(Intent.ACTION_VIEW, uri) 启动地图没有问题，但我希望我的特定活动处理地图。
I'm trying to use an explicit intent to display a MapView in my android app. Although I don't see anything wrong with my code, I keep getting a "NoClassDefFoundError" when I try to start my activity.
Basically, from my main activity (SetCriteria), I create the explicit intent when user presses a button :
Log.i(TAG, "Showing map..");
try{
Intent intentMap = new Intent(view.getContext(), AddLocation.class);
startActivity(intentMap);
}catch(Throwable ex) {
Log.e(TAG, "Error occured while trying to display map", ex);
}
My LogCat displays:
java.lang.NoClassDefFoundError: com.adm.AddLocation
...
Caused by: java.lang.IllegalAccessError: Class ref in pre-verified class resolved to unexpected implementation
My Manifest looks like this:
<application android:label="@string/app_name" android:icon="@drawable/ic_launcher_red">
<uses-library android:name="com.google.android.maps"/>
<activity android:name=".SetCriteria"
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=".AddLocation"
android:label="@string/add_location">
</activity>
</application>
I have only one package: com.adm. So what could be wrong? I have no problem launching a map by using Intent(Intent.ACTION_VIEW, uri) but I want my specific activity dealing with the map.
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评论（2）
您应该在第二个活动声明中的类名之前删除“
.”（点），因此它看起来像：You should remove the "
." (dot) before your class name in the second activity declaration, so it would look like:从清单片段来看，尚不清楚您定义了哪个包。
您需要将其放在顶级清单元素中：
如果您不添加它，系统将不会使用包，并且您的活动“
.AddLocation”将以不带类的“AddLocation”结束，它与 com.adm.AddLocation 不同。From the manifest snippet it is not clear, what package you have defined.
You need to put it in the top-level manifest element:
If you do not add that, the system will not use a package and your activity "
.AddLocation" will end as "AddLocation" without a class, which is not the same ascom.adm.AddLocation.