自定义 MapView 抛出 NoSuchMethodException,但它就在那里!
我正在尝试实现自定义 MapView。在我的 MapActivity (名为 mainmap)中,我有一个扩展 MapView 的内部类:
private class Lmapview extends MapView{
public Lmapview(Context context, AttributeSet attrs) {
super(context, attrs);
gestures = new GestureDetector(mainmap.this, new GestureListener(this));
}
public boolean OnTouchEvent(MotionEvent event){
return gestures.onTouchEvent(event);
}
}
我的 main.xml 已格式化以查找内部类,如下所示:
<?xml version="1.0" encoding="utf-8"?>
<view
xmlns:android="http://schemas.android.com/apk/res/android"
class="com.mondo.tbuddy.mainmap$Lmapview"
android:id="@+id/mapview"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:clickable="true"
android:apiKey=*****
/>
另外,在 Androidmanifest.xml 中,我有适当的
条目。
当我尝试运行我的应用程序时,我在 logcat 中得到(除其他外):
错误/AndroidRuntime(14999):引起 通过: android.view.InflateException: 二进制 XML 文件第 2 行:错误 膨胀类 com.mondo.tbuddy.mainmap$Lmapview
这是由我在 logcat 中找到的条目引起的:
错误/AndroidRuntime(14999):引起 通过:java.lang.NoSuchMethodException: Lmapview(上下文,属性集)
如果我理解正确,我的应用程序正在崩溃,因为 Android 说它找不到我的自定义 MapView(Lmapview 类)的适当构造函数。然而,正如您在上面所看到的,它已被定义并且与它正在寻找的签名相匹配。
谁能给我一些见解吗?
谢谢。
I'm trying to implement a custom MapView. Inside my MapActivity (named mainmap) I have an inner class which extends MapView:
private class Lmapview extends MapView{
public Lmapview(Context context, AttributeSet attrs) {
super(context, attrs);
gestures = new GestureDetector(mainmap.this, new GestureListener(this));
}
public boolean OnTouchEvent(MotionEvent event){
return gestures.onTouchEvent(event);
}
}
I have my main.xml formatted to find the inner class like so:
<?xml version="1.0" encoding="utf-8"?>
<view
xmlns:android="http://schemas.android.com/apk/res/android"
class="com.mondo.tbuddy.mainmap$Lmapview"
android:id="@+id/mapview"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:clickable="true"
android:apiKey=*****
/>
Also, in Androidmanifest.xml, I have the appropriate <uses-library android:name="com.google.android.maps"/>
entry.
When I try to run my app, I get (amongst other things) in logcat:
ERROR/AndroidRuntime(14999): Caused
by: android.view.InflateException:
Binary XML file line #2: Error
inflating class
com.mondo.tbuddy.mainmap$Lmapview
This is caused by this entry I find in logcat:
ERROR/AndroidRuntime(14999): Caused
by: java.lang.NoSuchMethodException:
Lmapview(Context,AttributeSet)
If I understand correctly, my app is crashing because Android is saying it doesn't find the appropriate constructor for my custom MapView (the Lmapview class). As you can see above, however, it is defined and it matches the signature it is looking for.
Can anyone give me some insight?
Thanks.
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在拥有超类对象之前,无法实例化内部非静态类。因此,您必须使内部类静态,或将其移至单独的类。
You cannot instantiate an inner non-static class before you have a super class object. Because of this you have to make the inner class static, or move it to a separate class.