扩展扩展 Layoutclass 的复合组件时出现问题
我正在尝试扩展 LinearLayout 以用作复合组件。我已经遵循了这个教程: 链接
这看起来相当直接向前。然而,当我尝试给我的组件充气时,它总是失败。我从 logCat 得到的错误是找不到我的类。对我来说这似乎很奇怪,据我所知 android 在它自己的组件中搜索我的组件(我不确定这里的措辞是否正确,请参见下文)。
我编写的代码如下:
main (当前活动):
//just the ordinary autogenerated eclipse code...
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
}
我的扩展线性布局:
public class DialPadView extends LinearLayout {
public DialPadView(Context ctx, AttributeSet attr) {
super(ctx, attr);
}
@Override
protected void onFinishInflate() {
super.onFinishInflate();
((Activity)getContext()).getLayoutInflater().inflate(R.layout.dialpadview, this);
}
}
我的 main.xml 布局文件
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<whalenut.testinflate.DialPadView
android:id="@+id/mydialpad"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
/></LinearLayout>
,最后是与我的复合组件一起使用的 dialpadview.xml 文件:
<?xml version="1.0" encoding="utf-8"?>
<DialPadView
xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<EditText
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="test"/>
</DialPadView>
当然,我所有的类文件都位于包 whalenut.testinflate
logCat 说:
java.lang.RuntimeException:无法启动活动ComponentInfo{whalenut.testinflate/whalenut.testinflate.TestInflateActivity}:android.view.InflateException:二进制XML文件行#2:错误膨胀类DialPadView
...
引起的:android.view.InflateException:二进制XML文件行#2:错误膨胀类 DialPadView
...
引起:java.lang.ClassNotFoundException:加载程序中的 android.view.DialPadView dalvik.system.PathClassLoader[/data/app/whalenut.testinflate-2.apk]
为什么 Dalvik(?) 在包 android.view 中搜索我的类而不是 whalenut.testinflate 当我在 xml 文件中给出完全限定的类名时,是否是因为它一开始就没有找到它?
简而言之,为什么我不能,或者更确切地说,我如何在 android 中扩展扩展布局?
I'm trying to extend a LinearLayout to use as a composite component. I have followed this tutorial:
link
Which seems fairly straight forward. However when I try to inflate my component it fails all the time. The error I get from logCat is that my class can't be found. It seems strange to me that as far as I can see android searches for my component among it's own components (I'm unsure about the correct wording here, please se below).
The code I have written is as follows:
main (the current activity):
//just the ordinary autogenerated eclipse code...
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
}
My extended linear layout:
public class DialPadView extends LinearLayout {
public DialPadView(Context ctx, AttributeSet attr) {
super(ctx, attr);
}
@Override
protected void onFinishInflate() {
super.onFinishInflate();
((Activity)getContext()).getLayoutInflater().inflate(R.layout.dialpadview, this);
}
}
My main.xml layout file
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<whalenut.testinflate.DialPadView
android:id="@+id/mydialpad"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
/></LinearLayout>
and finally my dialpadview.xml file to use with my composite component:
<?xml version="1.0" encoding="utf-8"?>
<DialPadView
xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<EditText
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="test"/>
</DialPadView>
ofcourse all my class files resides in the package whalenut.testinflate
logCat says this:
java.lang.RuntimeException: Unable to start activity ComponentInfo{whalenut.testinflate/whalenut.testinflate.TestInflateActivity}: android.view.InflateException: Binary XML file line #2: Error inflating class DialPadView
...
Caused by: android.view.InflateException: Binary XML file line #2: Error inflating class DialPadView
...
Caused by: java.lang.ClassNotFoundException: android.view.DialPadView in loader dalvik.system.PathClassLoader[/data/app/whalenut.testinflate-2.apk]
Why is Dalvik(?) searching for my class in the package android.view instead of whalenut.testinflate when I have given the fully qualified classname in the xml-file, is it because it doesn't find it there to begin with?
In short why can't I, or rather how do I inflate a extended Layout in android?
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您需要按如下方式更改 DialPadView:
然后在构造函数中调用它:
然后您可以在主要活动中使用以下内容:
我希望这有帮助!
You need to change your DialPadView as follows:
Then call this in your constructor:
You can then use the following in your main activity:
I hope this helps!