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[英]ViewPager in Fragment called from another Fragment Android
[英]Android: Scrolling from one Fragment to another through a ViewPager
我已经实现了一个ViewPager,它将多个Fragment连接在一起,以释放出您可能已经知道的“滚动视图”体验。 无论如何,我在第一个片段上有一个按钮,需要将用户滚动到第二个片段。 我该如何做到这一点呢? 这是我的代码:
ViewPager XML:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<android.support.v4.view.ViewPager
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/pager"
android:layout_width="match_parent"
android:layout_height="match_parent" >
</android.support.v4.view.ViewPager>
</LinearLayout>
片段1:
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#3498db" >
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:layout_gravity="left"
android:layout_marginLeft="15dp"
android:layout_marginTop="25dp"
android:text="Step 1"
android:textColor="#ffffff"
android:textSize="50dp" />
<Button
android:id="@+id/step1Btn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:layout_gravity="center"
android:layout_marginBottom="5sp"
android:background="@drawable/buttonshape"
android:shadowColor="#A8A8A8"
android:shadowDx="0"
android:shadowDy="0"
android:shadowRadius="5"
android:text="Next Step"
android:textColor="#FFFFFF"
android:textSize="30sp" />
</LinearLayout>
</RelativeLayout>
为了简短起见,假设第二个片段具有相同的XML。
因此,我们有两个片段。 这是片段Java类:
public class RegisterPageOne extends Fragment {
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
final View v = inflater.inflate(R.layout.registration_page1, container, false);
Button nextStep = (Button) v.findViewById(R.id.step1Btn);
nextStep.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View view) {
//Where I want to call the SECOND FRAG
}
});
return v;
}
public static RegisterPageOne newInstance(String text) {
RegisterPageOne f = new RegisterPageOne();
Bundle b = new Bundle();
b.putString("msg", text);
f.setArguments(b);
return f;
}
}
请帮助我:)
您可以使用viewPager对象的setCurrentItem(int item,boolean smoothScroll)方法来实现此目的。 这是文档。
在您的片段中看到了有关如何引用ViewPager的后续问题。 对于像我这样的相对新手来说,这非常令人费解,但是,我想我可以得到所有这些……我会告诉你我在代码中所做的事情。 在ViewPager中设置一个侦听器:
公共类PageViewActivity扩展FragmentActivity实现PageDisplayPortFrag.OnLinkExpectedListener {...}
这在您的片段中引用:
private OnLinkExpectedListener mListenerLink;
@Override
public void onAttach(Activity activity) {
super.onAttach(activity);
try {
mListenerLink = (OnLinkExpectedListener) activity;
} catch (ClassCastException e) {
throw new ClassCastException(activity.toString()
+ " must implement OnLinkExpectedListener");
}
}
@Override
public void onDetach() {
mListenerLink = null;
super.onDetach();
}
// THIS IS THE METHOD CALLED BY THE BUTTON CLICK !!!
public void linkExpected(String ticker) {
if (mListenerLink != null) {
mListenerLink.onLinkActivity(ticker);
}
}
public interface OnLinkExpectedListener {
public void onLinkActivity(String ticker);
}
然后,在ViewPager中调用一个方法:
@Override
public void onLinkActivity(String ticker) {
// receive ticker from port click; user wants to view page in webview, for this security
//Toast.makeText(this, "Ticker item clicked: " + ticker, Toast.LENGTH_SHORT).show();
// NEHARA, YOU MAY OR MAY NOT NEED TO DO STUFF HERE
// THIS IS WHAT I NEEDED TO DO; LEAVING IT FOR THE
// getFragmentTag() EXAMPLE -- WHICH CAME FROM Stack Overflow POSTERS
// get all-important fragment tag
String frag_Tag = getFragmentTag(pager.getId(),1);
// use tag to get the webview fragment
PageXYZWebviewFrag xyzWeb = (PageXYZWebviewFrag)
getSupportFragmentManager().findFragmentByTag(frag_Tag);
// send request to the webview fragment
xyzWeb.loadPageForSelectedSecurity(ticker);
// SET THE DESIRED FRAGMENT, assumes I know the fragment number
// from when I set up the ViewPager
// switch to the webview fragment
pager.setCurrentItem(1);
}
// fragment tag getter -- very important, yet has been elusive
private String getFragmentTag(int viewPagerId, int fragmentPosition) {
return "android:switcher:" + viewPagerId + ":" + fragmentPosition;
}
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