如何正确扩展布局类? [英] How do I properly extend a layout class?
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问题描述
我想打一个自定义的RelativeLayout,但我不断收到此错误:
I want to make a custom RelativeLayout, but I keep getting this error:
08-01 02:28:19.385: E/AndroidRuntime(9989): FATAL EXCEPTION: main
08-01 02:28:19.385: E/AndroidRuntime(9989): android.view.InflateException: Binary XML file line #1: Error inflating class com.stevenschoen.putio.CheckableRelativeLayout
08-01 02:28:19.385: E/AndroidRuntime(9989): at android.view.LayoutInflater.createView(LayoutInflater.java:596)
08-01 02:28:19.385: E/AndroidRuntime(9989): at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:687)
08-01 02:28:19.385: E/AndroidRuntime(9989): at android.view.LayoutInflater.inflate(LayoutInflater.java:466)
08-01 02:28:19.385: E/AndroidRuntime(9989): at android.view.LayoutInflater.inflate(LayoutInflater.java:396)
...
08-01 02:28:19.385: E/AndroidRuntime(9989): Caused by: java.lang.NoSuchMethodException: <init> [class android.content.Context, interface android.util.AttributeSet]
08-01 02:28:19.385: E/AndroidRuntime(9989): at java.lang.Class.getConstructorOrMethod(Class.java:460)
08-01 02:28:19.385: E/AndroidRuntime(9989): at java.lang.Class.getConstructor(Class.java:431)
08-01 02:28:19.385: E/AndroidRuntime(9989): at android.view.LayoutInflater.createView(LayoutInflater.java:561)
这是我的类:
public class CheckableRelativeLayout extends RelativeLayout implements
Checkable {
public CheckableRelativeLayout(Context context) {
super(context);
// TODO Auto-generated constructor stub
}
private boolean isChecked;
// List<Checkable> checkableViews = new ArrayList<Checkable>();
// @see android.widget.Checkable#isChecked()
public boolean isChecked() {
return isChecked;
}
// @see android.widget.Checkable#setChecked(boolean)
public void setChecked(boolean isChecked) {
this.isChecked = isChecked;
// for (Checkable c : checkableViews) {
// Pass the information to all the child Checkable widgets
// c.setChecked(isChecked);
// }
}
// @see android.widget.Checkable#toggle()
public void toggle() {
this.isChecked = !this.isChecked;
// for (Checkable c : checkableViews) {
// Pass the information to all the child Checkable widgets
// c.toggle();
// }
}
@Override
protected void onFinishInflate() {
super.onFinishInflate();
final int childCount = this.getChildCount();
for (int i = 0; i < childCount; ++i) {
findCheckableChildren(this.getChildAt(i));
}
}
/**
* Add to our checkable list all the children of the view that implement the
* interface Checkable
*/
private void findCheckableChildren(View v) {
if (v instanceof Checkable) {
// this.checkableViews.add((Checkable) v);
}
if (v instanceof ViewGroup) {
final ViewGroup vg = (ViewGroup) v;
final int childCount = vg.getChildCount();
for (int i = 0; i < childCount; ++i) {
findCheckableChildren(vg.getChildAt(i));
}
}
}
}
我在做什么错了?
What am I doing wrong?
推荐答案
您只实现一个构造函数。是XML能够使用的观点,你应该从View实现其他2的构造函数:
You implemented only one constructor. To be able use views in xml, you should implement 2 other constructors from View:
public CheckableRelativeLayout(Context context, AttributeSet attrs) {
super(context, attrs);
}
public CheckableRelativeLayout(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
}
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