Hello and thank you for trying to help!
I'm trying to build an app with ActionBarSherlcok. When I click the tabs, I would like the same fragment to instantiate but with dynamic data based on the tab I clicked. For some reason it keeps showing me the wrong data , though the correct parameter value is passed (I verified it using breakpoints and watches).
I've read about SimpleOnPageChangeListener, getCurrentItem and of course the Fragments Tutorial . I relied on SwipeyTabs example to create this, and built a short demo to show my problem here:
This is my MainActivity.java
package il.co.gilead.testdynamicfragments;
import com.actionbarsherlock.app.ActionBar;
import com.actionbarsherlock.app.SherlockFragmentActivity;
import android.os.Bundle;
import android.support.v4.view.ViewPager;
public class MainActivity extends SherlockFragmentActivity {
public static ViewPager mViewPager;
private TabsAdapter mTabsAdapter;
Integer intNumOfPages = 3;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
mViewPager = new ViewPager(this);
mViewPager.setId(R.id.pager);
setContentView(mViewPager);
final ActionBar bar = getSupportActionBar();
bar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
mTabsAdapter = new TabsAdapter(this, mViewPager);
for (int i=1; i<=intNumOfPages; i++) {
mTabsAdapter.addTab(bar.newTab().setText("Fragment "+i),
TestFrag.class, null);
}
}
}
This is my TestFrag.java
package il.co.gilead.testdynamicfragments;
import com.actionbarsherlock.app.SherlockFragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
public class TestFrag extends SherlockFragment {
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.frag_test, container, false);
TextView tv = (TextView) v.findViewById(R.id.textView1);
Integer pos = (MainActivity.mViewPager.getCurrentItem() + 1);
tv.setText("Page " + pos.toString());
return v;
}
}
My activity_main.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity" >
<android.support.v4.view.ViewPager
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/pager" />
</RelativeLayout>
and my test_frag.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="TextView" />
</LinearLayout>
Finally my TabsAdapter
public class TabsAdapter extends FragmentPagerAdapter implements ActionBar.TabListener, ViewPager.OnPageChangeListener{
private final Context mContext;
private final ActionBar mActionBar;
private final ViewPager mViewPager;
private final ArrayList<TabInfo> mTabs = new ArrayList<TabInfo>();
static final class TabInfo{
private final Class<?> clss;
private final Bundle args;
TabInfo(Class<?> _class, Bundle _args){
clss = _class;
args = _args;
}
}
public TabsAdapter(SherlockFragmentActivity fa, ViewPager pager) {
super(fa.getSupportFragmentManager());
mContext = fa;
mActionBar = fa.getSupportActionBar();
mViewPager = pager;
mViewPager.setAdapter(this);
mViewPager.setOnPageChangeListener(this);
}
public void addTab(ActionBar.Tab tab, Class<?> clss, Bundle args){
TabInfo info = new TabInfo(clss, args);
tab.setTag(info);
tab.setTabListener(this);
mTabs.add(info);
mActionBar.addTab(tab);
notifyDataSetChanged();
}
@Override
public void onPageScrollStateChanged(int state) {
}
@Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
}
@Override
public void onPageSelected(int position) {
mActionBar.setSelectedNavigationItem(position);
}
@Override
public void onTabSelected(Tab tab, FragmentTransaction ft) {
mViewPager.setCurrentItem(tab.getPosition());
Object tag = tab.getTag();
for (int i = 0; i<mTabs.size(); i++){
if (mTabs.get(i) == tag){
mViewPager.setCurrentItem(i);
}
}
}
@Override
public void onTabUnselected(Tab tab, FragmentTransaction ft) {
}
@Override
public void onTabReselected(Tab tab, FragmentTransaction ft) {
}
@Override
public Fragment getItem(int position) {
TabInfo info = mTabs.get(position);
return Fragment.instantiate(mContext, info.clss.getName(), info.args);
}
@Override
public int getCount() {
return mTabs.size();
}
}
If you'll play around with it, you'll see that clicking tab "Fragment 2" sometimes shows "Page 1" and sometimes shows "Page 3" and sometimes shows "Page 2". I think it has something to do with pre-loading the fragments, or fragment refresh, but at this point I am clueless...
Thanks again for your help!
Try to change this:
Integer pos = (MainActivity.mViewPager.getCurrentItem() + 1);
To this:
Integer pos = (getActivity().mViewPager.getCurrentItem() + 1);
I found out what the problem was. I browsed through ActionBarSherlock website and looked at the sample code. The implementation was different than mine, but one thing stood up. Here are the code changes in MainActivity.java:
for (int i=1; i<=intNumOfPages; i++)
{
Bundle args = new Bundle();
args.putInt("num", i);
mTabsAdapter.addTab(bar.newTab().setText("Fragment "+i), TestFrag.class, args);
}
Here is the addition to TestFrag.java:
public class TestFrag extends SherlockFragment {
Integer intPageNum;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Bundle args = getArguments();
if (args != null)
intPageNum = args.getInt("num");
else
intPageNum = 1;
}
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.frag_test, container, false);
TextView tv = (TextView) v.findViewById(R.id.textView1);
tv.setText("Page " + intPageNum.toString());
return v;
}
}
As you can see, I dropped the use of pos
altogether. Thank you all for trying to help!
The technical post webpages of this site follow the CC BY-SA 4.0 protocol. If you need to reprint, please indicate the site URL or the original address.Any question please contact:yoyou2525@163.com.