我目前正在使用片段修改應用程序從常規活動到TabbedActivity,到目前爲止,我已經成功地將片段的適當佈局加載到應用程序中創建,但是我有onCreateView方法的代碼執行,因爲我能夠調試那裏的每一行,但它對片段顯示的佈局沒有影響,此代碼負責管理諸如其他內容,填充Spinners 。片段加載它的內容,但代碼不會更新
我明白我在某個地方做錯了什麼,我只是無法弄清楚它是什麼以及它發生了什麼。
public class myClass extends AppCompatActivity {
private SectionsPagerAdapter mSectionsPagerAdapter;
private ViewPager mViewPager;
private TabLayout mTabLayout;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_myclass);
mSectionsPagerAdapter = new SectionsPagerAdapter(getFragmentManager());
mViewPager = (ViewPager) findViewById(R.id.container);
mViewPager.setAdapter(mSectionsPagerAdapter);
mTabLayout = (TabLayout) findViewById(R.id.tabs);
mTabLayout.setupWithViewPager(mViewPager);
myClass_Fragment ids = new myClass_Fragment();
FragmentManager fm = getFragmentManager();
fm.beginTransaction().replace(R.id.main_content, ids, "fragment one").commit();
}
public static class PlaceholderFragment extends Fragment {
public PlaceholderFragment() {
}
public static PlaceholderFragment newInstance() {
PlaceholderFragment fragment = new PlaceholderFragment();
return fragment;
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.ids, container, false);
return rootView;
}
}
public class SectionsPagerAdapter extends FragmentPagerAdapter {
public SectionsPagerAdapter(FragmentManager fm) {
super(fm);
}
@Override
public Fragment getItem(int position) {
return PlaceholderFragment.newInstance(position + 1);
}
@Override
public int getCount() {
return 2;
}
@Override
public CharSequence getPageTitle(int position) {
switch (position) {
case 0:
return "IDS";
case 1:
return "Other";
}
return null;
}
}
}
和碎片:
public class myClass_Fragment extends Fragment {
public myClass_Fragment() {
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.ids, container, false);
// code that updates views such as spinners
// everything in here works, I can see the content getting retrieved by debugging individual lines
return rootView;
}
}
所有視圖的片段的佈局,一旦應用程序加載時一切都顯示聲明,但沒有一個是得到上的onCreateView方法檢索的值片段。
我覺得這幾乎是一切應該重視這個問題,我想知道我做錯了什麼,我該怎麼做才能解決它。
按照要求,activity_myclass.xml:
<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/main_content"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
tools:context=".myClass">
<android.support.design.widget.AppBarLayout
android:id="@+id/appbar"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<android.support.v7.widget.Toolbar
android:id="@+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="?attr/colorPrimary"
app:layout_scrollFlags="scroll|enterAlways">
</android.support.v7.widget.Toolbar>
<android.support.design.widget.TabLayout
android:id="@+id/tabs"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:tabMode="fixed"
app:tabGravity="fill"/>
</android.support.design.widget.AppBarLayout>
<android.support.v4.view.ViewPager
android:id="@+id/container"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="@string/appbar_scrolling_view_behavior" />
</android.support.design.widget.CoordinatorLayout>
作爲一個側面說明,一切都被改變,以這種佈局之前,對應用程序工作正常啓動,所以這個問題必須與這個新實現。
PlaceholderFragment中的newInstance()方法在哪裏? –
對不起,我更新了這個問題。 – user1676874
你能否發佈activity_myclass.xml佈局文件? –