我已经开始使用 ViewPager 并且无法理解如何通过按下主布局上的按钮来添加新元素，如 TextView。我尝试了不同的方法，但没有一个成功。
任何想法都会对我有好处...
这是我的代码：
public class SimpleViewPagerActivity extends Activity {
private ViewPager myPager;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
MyPagerAdapter adapter = new MyPagerAdapter();
myPager = (ViewPager) findViewById(R.id.mypager);
myPager.setAdapter(adapter);
myPager.setCurrentItem(1);
Button btn_add = (Button) findViewById(R.id.button1);
btn_add.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
}
});
}
private class MyPagerAdapter extends PagerAdapter {
@Override
public View instantiateItem(View collection, int position) {
LayoutInflater inflater = (LayoutInflater) collection.getContext()
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
int resId = 0;
switch (position) {
case 0:
resId = R.layout.left;
break;
case 1:
resId = R.layout.middle;
break;
case 2:
resId = R.layout.right;
break;
}
View view = inflater.inflate(resId, null);
((ViewPager) collection).addView(view, 0);
return view;
}
@Override
public void destroyItem(View arg0, int arg1, Object arg2) {
((ViewPager) arg0).removeView((View) arg2);
}
@Override
public void finishUpdate(View arg0) {
// TODO Auto-generated method stub
}
@Override
public boolean isViewFromObject(View arg0, Object arg1) {
return arg0 == ((View) arg1);
}
@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
}
}
}
主要的.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/lt_lin"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<Button
android:id="@+id/button1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Button" />
<android.support.v4.view.ViewPager
android:id="@+id/mypager"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
</LinearLayout>
中间.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/text" />
</LinearLayout>