如何以编程方式触发Onclick事件？

I have a custom view with 2 linear layouts: the first is the view's header and the second is the the details view.

我有一个自定义视图,有2个线性布局:第一个是视图的标题,第二个是详细信息视图。

In the custom view, the OnClickListener of the header Linearlayout is already defined: when it fires, it collapses/expandes the second linearlayout.

在自定义视图中,已定义标题Linearlayout的OnClickListener:当它触发时,它会折叠/展开第二个linearlayout。

What I want to do is to add more functionalities to my header's OnClickListener event (i.e.: collapse/expand the second layout and show a Toast).

我想要做的是为我的标题的OnClickListener事件添加更多功能(即:折叠/展开第二个布局并显示Toast)。

I can't modify the source code of the custom view. I tried to set a new OnClickListener but it hides the initial event (collapse/expand).

我无法修改自定义视图的源代码。我尝试设置一个新的OnClickListener,但它隐藏了初始事件(折叠/展开)。

How should I implement this?

我该如何实现呢?

The source code of My Custom View:

我的自定义视图的源代码:

public class ExpandoLayout extends ViewGroup
{
    /* some declarations */
    private Linearlayout header;
    private linearlayout footer;

    /* some code */
    @override
    protected void onFinishInflate() {
    header= new LinearLayout(context);
    header.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                toggleExpand();
            }
        });
    }
}

What I want to do is to add some code to the already defined OnClickListener event in my activity. Something like that:

我想要做的是在我的活动中为已经定义的OnClickListener事件添加一些代码。像这样的东西:

public class myActivity extends Activity {
private Linearlayout myCustomView;
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.rsdetail);
    myCustomView= (MyCustomView) findViewById(R.id.expanded);

    myCustomView.getChildAt(0).setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {
            if(v instanceof LinearLayout)
            {
                v.performClick();

                Toast.makeText(getActivity(), "ExpandoOnClickListener", 2000).show();
            }
        }
    });
}

4 个解决方案

#1

Simple solution would be to get original OnClickListener and then fire it in new one:

简单的解决方案是获取原始的OnClickListener,然后在新的中激活它:

final OnClickListener preDefinedListener = myCustomView.getChildAt(0).getOnClickListner();

myCustomView.getChildAt(0).setOnClickListener(new OnClickListener() {
    @Override
    public void onClick(View v) {
        if(v instanceof LinearLayout)
        {
            preDefinedListener.onClick(v); // calls default (defined by MyCustomView)

            Toast.makeText(getActivity(), "ExpandoOnClickListener", 2000).show();
        }
    }
});

Sadly, View does not have getOnClickListner(), but I guess you can use reflection to get it. It is stored in the field mOnClickListener (source).

遗憾的是,View没有getOnClickListner(),但我想你可以使用反射来获取它。它存储在字段mOnClickListener(source)中。

This is how you can get OnClickListener defined for your layout:

这是为您的布局定义OnClickListener的方法:

OnClickListener tmpOnClickListener = null;
try {
    Class<View> cls = (Class<View>) Class.forName("android.view.View");
    Field fld = cls.getDeclaredField("mOnClickListener");
    fld.setAccessible(true); // because it is protected

    tmpOnClickListener = (OnClickListener) fld.get(myCustomView.getChildAt(0));

    fld.setAccessible(false); // restore it's original property
} catch (SecurityException e) {
    e.printStackTrace();
} catch (NoSuchFieldException e) {
    e.printStackTrace();
} catch (IllegalArgumentException e) {
    e.printStackTrace();
} catch (IllegalAccessException e) {
    e.printStackTrace();
} catch (ClassNotFoundException e) {
    e.printStackTrace();
} 

final OnClickListener preDefinedListener = tmpOnClickListener;

if (preDefinedListener != null) {
    myCustomView.getChildAt(0).setOnClickListener(new OnClickListener() {
        @Override
        public void onClick(View paramView) {
            preDefinedListener.onClick(paramView);

            Toast.makeText(getActivity(), "ExpandoOnClickListener", Toast.LENGTH_LONG).show();
        }
});

I didn't really bother to handle all exception correctly, but it's enough to get the idea. It might look messy, but it's actually just 5 lines of new code to solve your problem.

我没有真正麻烦地正确处理所有异常,但它足以得到这个想法。它可能看起来很乱,但它实际上只有5行新代码来解决你的问题。

#2

You can programmatically raise click event on a View to call it's OnClickListener as below:

您可以以编程方式在视图上引发单击事件以将其命名为OnClickListener,如下所示:

view.performClick();

Now if you call this on your second layout under first layout's OnClickListener then i hope it should do the magic

现在,如果你在第一个布局的OnClickListener下的第二个布局上调用它,那么我希望它应该做的魔术

#3

Since SDK 15 you can just call method:

从SDK 15开始,您只需调用方法:

view.callOnClick()

#4

If you cannot modify the code of CustomView then you have the below option.

如果您无法修改CustomView的代码,则可以使用以下选项。

Extend the CustomView.

扩展CustomView。

Override the onClick() method and bind this as a Listener to the first layout.

重写onClick()方法并将其绑定为第一个布局的侦听器。

Inside onClick() first call super.onClick() then add your additional functionality below.

在onClick()里面首先调用super.onClick(),然后在下面添加你的附加功能。

This way you are keeping the existing code and adding additional functionality as well.

这样您就可以保留现有代码并添加其他功能。

#1