按钮的onClick在viewPager？ [英] Button onClick in viewPager?

问题描述

我有一个viewPager，并在第二页我有一个按钮。我希望它做一些事情的onClick但它没有这样做。

I've got a viewPager, and in second page i've got a button. I want it to do something onClick but it's not doing.

我已经在XML文件中完成： 机器人：的onClick =buttonClick

I've done on xml file: android:onClick="buttonClick"

同时，我已经试过onCreat ...

And also i've tried setOnClickListener both inside and outside of onCreat...

这些都不摸索出...

Neither of these worked out...

我的viewPagerAdapter工作正常！我可以看到的网页，并在它们之间切换。但我只是不能让一个按钮做任何事情。它可以在适配器完成，但我会做很多事情，所以它不会是有用的......

My viewPagerAdapter works fine! I can see pages, and switch between them. But I'm just not able to make a button do anything. It can be done in adapter, but i'll do lots of things so it's not gonna be useful...

任何帮助是AP preciated。

Any help is appreciated.

下面是code：

public class ViewPagerProjectActivity extends Activity {

Button btn;
AbsoluteLayout l;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    ViewPagerAdapter adapter = new ViewPagerAdapter( this );
    ViewPager pager = (ViewPager)findViewById( R.id.viewpager );
    pager.setAdapter( adapter );
    pager.setCurrentItem(0);        

}   

@Override
protected void onSaveInstanceState(Bundle outState) {
    super.onSaveInstanceState(outState);

    l = (AbsoluteLayout) findViewById(R.id.layout2);
    btn = (Button) l.findViewById(R.id.button1);
    // btn.setOnClickListener(this);        
}

public void buttonClick(View v) {
    if(v.equals(btn)) {                 
        l.setBackgroundDrawable(getResources().getDrawable(R.drawable.background));
    }
}

}

推荐答案

我看到了一些问题，您的code：

I see a few problems with your code:

1. 您不应除了...节能状态在做的onSaveInstanceState 东西。 的onSaveInstanceState 当活动即将暂停时，才会调用;它不会被调用，直到那时，因此附加监听器在那里什么都不会做。 ：（
2. 您不能做 btn.setOnClickListener（本）除非你的 ViewPagerProjectActivity 实现onClickListener。所以，你可以实现的，或者仅使用低于code。

1. You should not be doing anything in onSaveInstanceState aside from...saving state. onSaveInstanceState is only called when the activity is about to be paused; it will not be called until then, therefore attaching a listener in there will not do anything. :(
2. You can't do btn.setOnClickListener(this) unless your ViewPagerProjectActivity implements onClickListener. So you could implement that, or just use the code below.

的setContentView（R.layout.main）后，将这个code到的onCreate ：

Button btn = (Button) findViewById(R.id.button1);

OnClickListener listener = new OnClickListener(){

@Override
public void onClick(View v) {
    v.setBackgroundDrawable(getResources().getDrawable(R.drawable.background));
}};
if (btn != null)
    btn.setOnClickListener(listener);

这篇关于按钮的onClick在viewPager？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！