viewPager中的按钮onClick? [英] Button onClick in viewPager?

问题描述

我有一个 viewPager，在第二页我有一个按钮.我希望它在 onClick 上做一些事情，但它没有做.

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.

我已经完成了 xml 文件:android:onClick="buttonClick"

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

而且我在 onCreat 内外都尝试过 setOnClickListener...

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

这些都没有成功...

我的 viewPagerAdapter 工作正常！我可以看到页面，并在它们之间切换.但我只是无法让按钮做任何事情.它可以在适配器中完成，但我会做很多事情，所以它不会有用......

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...

感谢任何帮助.

代码如下:

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

我发现你的代码有一些问题:

I see a few problems with your code:

1. 除了...保存状态之外，您不应该在 onSaveInstanceState 中做任何事情.onSaveInstanceState 仅在activity即将暂停时调用；在那之前它不会被调用，因此在其中附加一个监听器不会做任何事情.:(
2. 除非您的 ViewPagerProjectActivity 实现 onClickListener，否则您不能执行 btn.setOnClickListener(this).所以你可以实现它，或者只使用下面的代码.

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.

将此代码移动到 setContentView(R.layout.main) 之后的 onCreate 中:

Move this code into onCreate after setContentView(R.layout.main):

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viewPager中的按钮onClick?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！