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SUBMITTED BY: Guest

DATE: July 29, 2014, 5:07 p.m.

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  1. public class MainActivity extends ActionBarActivity implements ActionBar.TabListener, UploadFragment.OnFragmentInteractionListener {
  3. SectionsPagerAdapter mSectionsPagerAdapter;
  4. ViewPager mViewPager;
  7. @Override
  8. protected void onCreate(Bundle savedInstanceState) {
  9. super.onCreate(savedInstanceState);
  10. setContentView(R.layout.activity_main);
  12. // Set up the action bar.
  13. final ActionBar actionBar = getSupportActionBar();
  14. actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
  16. // Create the adapter that will return a fragment for each of the three
  17. // primary sections of the activity.
  18. mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager());
  20. // Set up the ViewPager with the sections adapter.
  21. mViewPager = (ViewPager) findViewById(R.id.pager);
  22. mViewPager.setAdapter(mSectionsPagerAdapter);
  24. mViewPager.setOnPageChangeListener(new ViewPager.SimpleOnPageChangeListener() {
  25. @Override
  26. public void onPageSelected(int position) {
  27. actionBar.setSelectedNavigationItem(position);
  28. }
  29. });
  31. // For each of the sections in the app, add a tab to the action bar.
  32. for (int i = 0; i < mSectionsPagerAdapter.getCount(); i++) {
  34. actionBar.addTab(
  35. actionBar.newTab()
  36. .setText(mSectionsPagerAdapter.getPageTitle(i))
  37. .setTabListener(this));
  38. }
  41. }
  44. public class SectionsPagerAdapter extends FragmentPagerAdapter {
  46. public SectionsPagerAdapter(FragmentManager fm) {
  47. super(fm);
  48. }
  50. @Override
  51. public Fragment getItem(int position) {
  52. // getItem is called to instantiate the fragment for the given page.
  53. // Return a PlaceholderFragment (defined as a static inner class below).
  54. switch (position) {
  55. case 0:
  56. return new ContainerFragment();
  57. case 1:
  58. return null;
  59. }
  60. return null;
  61. }
  63. @Override
  64. public int getCount() {
  65. // Show 2 total pages.
  66. return 2;
  67. }
  69. @Override
  70. public CharSequence getPageTitle(int position) {
  71. Locale l = Locale.getDefault();
  72. switch (position) {
  73. case 0:
  74. return getString(R.string.title_section1).toUpperCase(l);
  75. case 1:
  76. return getString(R.string.title_section2).toUpperCase(l);
  77. }
  78. return null;
  79. }
  80. }
  82. }
  84. public class ContainerFragment extends Fragment {
  86. @Override
  87. public View onCreateView(LayoutInflater inflater, ViewGroup container,
  88. Bundle savedInstanceState) {
  89. /* Inflate the layout for this fragment */
  90. View view = inflater.inflate(R.layout.fragment_main, container, false);
  92. FragmentTransaction transaction = getChildFragmentManager().beginTransaction();
  93. /*
  94. * When this container fragment is created, we fill it with our first
  95. * "real" fragment
  96. */
  97. transaction.replace(R.id.frame, new UploadFragment());
  98. transaction.commit();
  100. return view;
  101. }
  104. }
  106. public class UploadFragment extends Fragment {
  108. /*Handler for the api call*/
  109. private AsyncHttpResponseHandler mConnectionUtil;
  112. @Override
  113. public View onCreateView(LayoutInflater inflater, ViewGroup container,
  114. Bundle savedInstanceState) {
  115. View v = inflater.inflate(R.layout.fragment_upload, container, false);
  118. /*The response handler declaration/definition */
  119. mConnectionUtil = new AsyncHttpResponseHandler() {
  121. @Override
  122. public void onSuccess(int i, Header[] headers, byte[] bytes) {
  125. ResultFragment resultFrag = new ResultFragment();
  126. FragmentTransaction ft = getChildFragmentManager().beginTransaction();
  127. ft.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_OPEN);
  128. ft.addToBackStack(null);
  130. ft.replace(R.id.frame, resultFrag);
  131. ft.commit();
  134. }
  135. };
  137. /*OnClickListener for the go/upload button*/
  138. mUploadButton.setOnClickListener(new View.OnClickListener() {
  139. @Override
  140. public void onClick(View view) {
  141. /*Post to the api url with the params and the previously defined http request handler*/
  142. AsyncHttpClient client = new AsyncHttpClient();
  143. client.post("http://192.168.43.153:8000/form-submit", params, mConnectionUtil);
  144. }
  145. }
  146. });
  148. // Return fragment view
  149. return v;
  150. }
  152. }
  154. <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
  155. android:layout_width="fill_parent"
  156. android:layout_height="fill_parent"
  157. android:id="@+id/frame"
  158. >
  160. </FrameLayout>
  162. java.lang.NullPointerException: Attempt to write to field 'android.support.v4.app.FragmentManagerImpl android.support.v4.app.Fragment.mFragmentManager' on a null object reference
  163. at android.support.v4.app.BackStackRecord.doAddOp(BackStackRecord.java:394)
  164. at android.support.v4.app.BackStackRecord.add(BackStackRecord.java:389)
  165. at android.support.v4.app.FragmentPagerAdapter.instantiateItem(FragmentPagerAdapter.java:99)
  166. at android.support.v4.view.ViewPager.addNewItem(ViewPager.java:832)
  167. at android.support.v4.view.ViewPager.populate(ViewPager.java:1048)
  168. at android.support.v4.view.ViewPager.populate(ViewPager.java:914)
  169. at android.support.v4.view.ViewPager.onMeasure(ViewPager.java:1436)
  170. at android.view.View.measure(View.java:16514)
  171. at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5125)
  172. at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
  173. at android.view.View.measure(View.java:16514)
  174. at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5125)
  175. at com.android.internal.widget.ActionBarOverlayLayout.onMeasure(ActionBarOverlayLayout.java:327)
  176. at android.view.View.measure(View.java:16514)
  177. at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5125)
  178. at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
  179. at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2939)
  180. at android.view.View.measure(View.java:16514)
  181. at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:1912)
  182. at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1109)
  183. at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1291)
  184. at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:996)
  185. at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:5600)
  186. at android.view.Choreographer$CallbackRecord.run(Choreographer.java:761)
  187. at android.view.Choreographer.doCallbacks(Choreographer.java:574)
  188. at android.view.Choreographer.doFrame(Choreographer.java:544)
  189. at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:747)
  190. at android.os.Handler.handleCallback(Handler.java:733)
  191. at android.os.Handler.dispatchMessage(Handler.java:95)
  192. at android.os.Looper.loop(Looper.java:136)
  193. at android.app.ActivityThread.main(ActivityThread.java:5141)
  194. at java.lang.reflect.Method.invoke(Native Method)
  195. at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:799)
  196. at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:615)
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