How to use ViewPager?

how to use a ViewPager in a fragment

• I download a project about ViewPager and CirclePageIndicator. It works well on my tablet and its code is : Test1Activity.java: TestFragmentAdapter mAdapter; ViewPager mPager; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); //The look of this sample is set via a style in the manifest setContentView(R.layout.simple_circles); mAdapter = new TestFragmentAdapter(getSupportFragmentManager()); mPager = (ViewPager)findViewById(R.id.pager); mPager.setAdapter(mAdapter); CirclePageIndicator indicator = (CirclePageIndicator)findViewById(R.id.indicator); indicator.setViewPager(mPager); } TestFragmentAdapter.java: class TestFragmentAdapter extends FragmentPagerAdapter { protected static final String[] CONTENT = new String[] { "Page1", "Page2", "Page3", "Page4", }; private int mCount = CONTENT.length; public TestFragmentAdapter(FragmentManager fragmentManager) { super(fragmentManager); } @Override public Fragment getItem(int position) { return TestFragment.newInstance(CONTENT[position % CONTENT.length]); } @Override public int getCount() { return mCount; } public void setCount(int count) { if (count > 0 && count <= 10) { mCount = count; notifyDataSetChanged(); } }} TestFragment: public final class TestFragment extends Fragment { private static final String KEY_CONTENT = "TestFragment:Content"; public static TestFragment newInstance(String content) { TestFragment fragment = new TestFragment(); fragment.mContent = content; return fragment; } private String mContent = "???"; @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { if ((savedInstanceState != null) && savedInstanceState.containsKey(KEY_CONTENT)) { mContent = savedInstanceState.getString(KEY_CONTENT); } TextView text = new TextView(getActivity()); text.setGravity(Gravity.CENTER); text.setText(mContent); text.setTextSize(20 * getResources().getDisplayMetrics().density); text.setPadding(20, 20, 20, 20); LinearLayout layout = new LinearLayout(getActivity()); layout.setLayoutParams(new LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT)); layout.setGravity(Gravity.CENTER); layout.addView(text); return layout; } @Override public void onSaveInstanceState(Bundle outState) { super.onSaveInstanceState(outState); outState.putString(KEY_CONTENT, mContent); }} now I want to use this ViewPager in a Fragment instead of Activity, but I am puzzled. The constructor of TestFragmentAdapter accept a parameter with type android.support.v4.app.FragmentManager, but in a fragment I can only use getFragmentManager() to get an android.app.FragmentManager type, thus the mAdapter = new TestFragmentAdapter(getSupportFragmentManager()); is always wrong. I must finish my project within days, so can u tell me how to modify my code to achieve same function in a fragment? Thx!!

• Answer:

  Have you try to replace extends Fragment by extends android.support.v4.app.Fragment ? When you do this, getFragmentManager() refers to android.support.v4.app.FragmentManager.