如何在 viewpager 中编写按钮 onClick 方法? [英] How to write button onClick method in viewpager?

问题描述

我想在使用 viewpager 的按钮单击时发送消息我还想了解有关如何访问 viewpager 中的视图的更多信息.

I want to Toast a message on button click using viewpager also I want more information on how to access views in viewpager.

我已经尝试过以下代码....不工作

I have tried following code.... not working

public class MyPagerAdapter extends PagerAdapter {

    @Override
    public int getCount() {
        return 3;
    }

    @Override
    public Object instantiateItem(final View collection, final int position) {
         v = new View(collection.getContext());
        LayoutInflater inflater =
                (LayoutInflater) collection.getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);

        int resId = 0;
        switch (position) {
        case 0:
            resId = R.layout.cate1;
            v = inflater.inflate(R.layout.cate1, null, false);
            add1 = (Button) v.findViewById(R.id.btnAdd);
            add1.setOnClickListener( new OnClickListener() {
                public void onClick(View m) {
                   Toast.makeText(collection.getContext(),"click",Toast.LENGTH_LONG).show();
                }
            });


            break;
        case 1:
            resId = R.layout.cate2;
            break;
        case 2:
            resId = R.layout.cate3;
            break;
        }

        View view = inflater.inflate(resId, null);
        ((ViewPager) collection).addView(view, 0);

        return view;
    }

    @Override
    public void destroyItem(final View arg0, final int arg1, final Object arg2) {
        ((ViewPager) arg0).removeView((View) arg2);

    }

    @Override
    public boolean isViewFromObject(final View arg0, final Object arg1) {
        return arg0 == ((View) arg1);

    }

    @Override
    public void finishUpdate(View arg0) {
        // TODO Auto-generated method stub

    }

    @Override
    public void restoreState(Parcelable arg0, ClassLoader arg1) {
        // TODO Auto-generated method stub

    }

    @Override
    public Parcelable saveState() {
        // TODO Auto-generated method stub
        return null;
    }

    @Override
    public void startUpdate(View arg0) {
        // TODO Auto-generated method stub

    }

    }

我已经为按钮 onclick 编写了以下代码.. 不工作..

I have written following code for button onclick.... not working..

      v = inflater.inflate(R.layout.cate1, null, false);
            add1 = (Button) v.findViewById(R.id.btnAdd);
            add1.setOnClickListener( new OnClickListener() {
                public void onClick(View m) {
                   Toast.makeText(collection.getContext(),"click",Toast.LENGTH_LONG).show();
                }
            });

请帮助提前谢谢你.

推荐答案

保持你的代码不变，但改变:

Leave your code all the same but change:

    ((ViewPager) collection).addView(view, 0);

    return view;

到

    ((ViewPager) collection).addView(v, 0);

    return v;

您在一个膨胀的按钮上执行了 onclick，然后您用 resId 膨胀了另一个视图并将其呈现在屏幕上，该按钮存在于您的应用程序的内存中，但没有其他地方，通过返回 v，该按钮是绘制并在点击时调用 onclicklistener.

you did the onclick right on a button that was inflated, then you inflated another view iwth resId and rendered it on the screen, that button exists in the memory of your app but no where else, by returning v, that button is drawn and the onclicklistener is invoked on click.

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