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android - 如何正确扩展布局类?

转载 作者:IT老高 更新时间:2023-10-28 22:11:41 26 4
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我想做一个自定义的RelativeLayout,但我一直收到这个错误:

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)

这是我的课:

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));
}
}
}
}

我做错了什么?

最佳答案

您只实现了一个构造函数。为了能够在 xml 中使用 View ,您应该从 View 中实现 2 个其他构造函数:

public CheckableRelativeLayout(Context context, AttributeSet attrs) {
super(context, attrs);
}

public CheckableRelativeLayout(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
}

关于android - 如何正确扩展布局类?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/11753719/

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