Java tutorial
package com.github.federvieh.selma; import java.io.BufferedReader; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; import java.util.ArrayList; import android.app.Activity; import android.app.AlertDialog; import android.content.Context; import android.content.DialogInterface; import android.content.pm.PackageInfo; import android.content.pm.PackageManager.NameNotFoundException; import android.content.res.Configuration; import android.os.Bundle; import android.support.v4.app.ActionBarDrawerToggle; import android.support.v4.app.Fragment; import android.support.v4.view.GravityCompat; import android.support.v4.widget.DrawerLayout; import android.support.v7.app.ActionBar; import android.support.v7.app.ActionBarActivity; import android.util.Log; import android.view.LayoutInflater; import android.view.Menu; import android.view.MenuInflater; import android.view.MenuItem; import android.view.View; import android.view.View.OnClickListener; import android.view.ViewGroup; import android.webkit.WebView; import android.widget.LinearLayout; import com.github.federvieh.selma.assimillib.AssimilDatabase; import com.github.federvieh.selma.assimillib.OverlayManager; import org.acra.ACRA; import org.acra.ACRAConfigurationException; import org.acra.ReportingInteractionMode; /** * Fragment used for managing interactions for and presentation of a navigation * drawer. See the <a href= * "https://developer.android.com/design/patterns/navigation-drawer.html#Interaction" * > design guidelines</a> for a complete explanation of the behaviors * implemented here. */ public class NavigationDrawerFragment extends Fragment { /** * Remember the position of the selected item. */ private static final String STATE_SELECTED_POSITION = "selected_navigation_drawer_position"; /** * Per the design guidelines, you should show the drawer on launch until the * user manually expands it. This shared preference tracks this. */ // private static final String PREF_USER_LEARNED_DRAWER = "navigation_drawer_learned"; /** * A pointer to the current callbacks instance (the Activity). */ private NavigationDrawerCallbacks mCallbacks; /** * Helper component that ties the action bar to the navigation drawer. */ private ActionBarDrawerToggle mDrawerToggle; private DrawerLayout mDrawerLayout; private View mDrawerView; private View mFragmentContainerView; private int mCurrentSelectedPosition = 0; // private boolean mFromSavedInstanceState; // private boolean mUserLearnedDrawer; private LinearLayout mCourseListView; private ArrayList<String> allCourses; private CourseListAdapter mCourseListAdapter; public NavigationDrawerFragment() { } @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); Log.i("LT", this.getClass().getSimpleName() + ".onCreate(); savedInstanceState=" + savedInstanceState); // Read in the flag indicating whether or not the user has demonstrated // awareness of the // drawer. See PREF_USER_LEARNED_DRAWER for details. // SharedPreferences sp = PreferenceManager // .getDefaultSharedPreferences(getActivity()); // mUserLearnedDrawer = sp.getBoolean(PREF_USER_LEARNED_DRAWER, false); if (savedInstanceState != null) { mCurrentSelectedPosition = savedInstanceState.getInt(STATE_SELECTED_POSITION); // mFromSavedInstanceState = true; } } @Override public void onActivityCreated(Bundle savedInstanceState) { super.onActivityCreated(savedInstanceState); // Indicate that this fragment would like to influence the set of // actions in the action bar. setHasOptionsMenu(true); } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { Log.d("LT", getClass().getSimpleName() + ".onCreateView()"); mDrawerView = inflater.inflate(R.layout.fragment_navigation_drawer, container, false); // mDrawerView // .setOnItemClickListener(new AdapterView.OnItemClickListener() { // @Override // public void onItemClick(AdapterView<?> parent, View view, // int position, long id) { // selectItem(position); // } // }); mCourseListView = (LinearLayout) mDrawerView.findViewById(R.id.courseListView); if ((allCourses == null) && (AssimilDatabase.isAllocated())) { allCourses = AssimilDatabase.getAllCourses(); mCourseListAdapter = new CourseListAdapter(getActivity(), allCourses, this); mCourseListView.removeAllViews(); for (int i = 0; i < allCourses.size(); i++) { mCourseListView.addView(mCourseListAdapter.getView(i, null, mCourseListView)); } } View showTips = mDrawerView.findViewById(R.id.textViewNavTips); OnClickListener oclTips = new OnClickListener() { @Override public void onClick(View v) { OverlayManager.resetOverlays(); mDrawerLayout.closeDrawer(mFragmentContainerView); } }; showTips.setOnClickListener(oclTips); View showLicense = mDrawerView.findViewById(R.id.textViewNavLicense); OnClickListener oclLicense = new OnClickListener() { @Override public void onClick(View v) { showLicense(); mDrawerLayout.closeDrawer(mFragmentContainerView); } }; showLicense.setOnClickListener(oclLicense); View sendLogToDev = mDrawerView.findViewById(R.id.textViewLogToDev); OnClickListener oclLogToDev = new OnClickListener() { @Override public void onClick(View v) { try { ACRA.getConfig().setMode(ReportingInteractionMode.SILENT); } catch (ACRAConfigurationException e) { Log.e("LT", "Problem setting ACRA config to silent", e); } ACRA.getErrorReporter().handleException(null, false); try { ACRA.getConfig().setMode(ReportingInteractionMode.DIALOG); } catch (ACRAConfigurationException e) { Log.e("LT", "Problem setting ACRA config back to dialog", e); } } }; sendLogToDev.setOnClickListener(oclLogToDev); return mDrawerView; } /** * */ protected void showLicense() { // 1. Instantiate an AlertDialog.Builder with its constructor AlertDialog.Builder builder = new AlertDialog.Builder(getActivity()); PackageInfo pInfo = null; try { pInfo = getActivity().getPackageManager().getPackageInfo(getActivity().getPackageName(), 0); } catch (NameNotFoundException e) { Log.e("LT", "Could not get package version", e); } StringBuffer licenseText = new StringBuffer(readRawTextFile(getActivity(), R.raw.license_part1)); if (pInfo != null) { licenseText.append(pInfo.versionName); } else { licenseText.append("<unknown version>"); } licenseText.append(readRawTextFile(getActivity(), R.raw.license_part2)); builder.setMessage(licenseText).setTitle(R.string.action_license); builder.setPositiveButton(R.string.show_license, new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int id) { // Intent browserIntent = new Intent(Intent.ACTION_VIEW, Uri.parse("http://www.gnu.org/licenses/gpl-2.0-standalone.html")); // startActivity(browserIntent); openGPL(); } }); builder.setNegativeButton(R.string.cancel, new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int id) { // User cancelled the dialog } }); AlertDialog dialog = builder.create(); dialog.show(); } /** * */ protected void openGPL() { AlertDialog.Builder builder = new AlertDialog.Builder(getActivity()); // Get the layout inflater LayoutInflater inflater = getActivity().getLayoutInflater(); // Inflate and set the layout for the dialog // Pass null as the parent view because its going in the dialog layout View layoutView = inflater.inflate(R.layout.license_view, null); builder.setView(layoutView); WebView webView = (WebView) layoutView.findViewById(R.id.webViewLicense); webView.loadUrl("file:///android_res/raw/gpl_3_0_standalone.html"); builder.setPositiveButton(R.string.ok, new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int id) { // User closed the dialog } }); AlertDialog dialog = builder.create(); dialog.show(); } private static String readRawTextFile(Context ctx, int resId) { InputStream inputStream = ctx.getResources().openRawResource(resId); InputStreamReader inputreader = new InputStreamReader(inputStream); BufferedReader buffreader = new BufferedReader(inputreader); String line; StringBuilder text = new StringBuilder(); try { int lineNbr = 0; while ((line = buffreader.readLine()) != null) { if (lineNbr > 0) { text.append('\n'); } text.append(line); lineNbr++; } } catch (IOException e) { return null; } return text.toString(); } /** Should be called whenever an item was selected, so that the navigation drawer is re-drawn. * */ private void redraw() { mCourseListAdapter = new CourseListAdapter(getActivity(), allCourses, this); mCourseListView.removeAllViews(); for (int i = 0; i < allCourses.size(); i++) { mCourseListView.addView(mCourseListAdapter.getView(i, null, mCourseListView)); } } public boolean isDrawerOpen() { return mDrawerLayout != null && mDrawerLayout.isDrawerOpen(mFragmentContainerView); } /** * Users of this fragment must call this method to set up the navigation * drawer interactions. * * @param fragmentId * The android:id of this fragment in its activity's layout. * @param drawerLayout * The DrawerLayout containing this fragment's UI. */ public void setUp(int fragmentId, DrawerLayout drawerLayout) { mFragmentContainerView = getActivity().findViewById(fragmentId); mDrawerLayout = drawerLayout; // set a custom shadow that overlays the main content when the drawer // opens mDrawerLayout.setDrawerShadow(R.drawable.drawer_shadow, GravityCompat.START); // set up the drawer's list view with items and click listener if ((AssimilDatabase.isAllocated())) { allCourses = AssimilDatabase.getAllCourses(); mCourseListAdapter = new CourseListAdapter(getActivity(), allCourses, this); mCourseListView.removeAllViews(); for (int i = 0; i < allCourses.size(); i++) { mCourseListView.addView(mCourseListAdapter.getView(i, null, mCourseListView)); } } ActionBar actionBar = getActionBar(); actionBar.setDisplayHomeAsUpEnabled(true); actionBar.setHomeButtonEnabled(true); // ActionBarDrawerToggle ties together the the proper interactions // between the navigation drawer and the action bar app icon. mDrawerToggle = new ActionBarDrawerToggle(getActivity(), /* host Activity */ mDrawerLayout, /* DrawerLayout object */ R.drawable.ic_drawer, /* nav drawer image to replace 'Up' caret */ R.string.navigation_drawer_open, /* * "open drawer" description for * accessibility */ R.string.navigation_drawer_close /* * "close drawer" description for * accessibility */ ) { @Override public void onDrawerClosed(View drawerView) { super.onDrawerClosed(drawerView); if (!isAdded()) { return; } ((ShowLessonFragmentListener) getActivity()).onResumedTitleUpdate(null); getActivity().supportInvalidateOptionsMenu(); // calls // onPrepareOptionsMenu() } @Override public void onDrawerOpened(View drawerView) { super.onDrawerOpened(drawerView); if (!isAdded()) { return; } // if (!mUserLearnedDrawer) { // // The user manually opened the drawer; store this flag to // // prevent auto-showing // // the navigation drawer automatically in the future. // mUserLearnedDrawer = true; // SharedPreferences sp = PreferenceManager // .getDefaultSharedPreferences(getActivity()); // sp.edit().putBoolean(PREF_USER_LEARNED_DRAWER, true) // .commit(); // } getActivity().supportInvalidateOptionsMenu(); // calls // onPrepareOptionsMenu() } }; // If the user hasn't 'learned' about the drawer, open it to introduce // them to the drawer, // per the navigation drawer design guidelines. // if (!mUserLearnedDrawer && !mFromSavedInstanceState) { // mDrawerLayout.openDrawer(mFragmentContainerView); // } // Defer code dependent on restoration of previous instance state. mDrawerLayout.post(new Runnable() { @Override public void run() { mDrawerToggle.syncState(); } }); mDrawerLayout.setDrawerListener(mDrawerToggle); } public void selectItem(String courseName, boolean starredOnly) { // mCurrentSelectedPosition = position; // if (mDrawerListView != null) { // mDrawerListView.setItemChecked(position, true); // } if (mDrawerLayout != null) { mDrawerLayout.closeDrawer(mFragmentContainerView); } if (mCallbacks != null) { mCallbacks.onLangItemSelected(courseName, starredOnly); } redraw(); } @Override public void onAttach(Activity activity) { super.onAttach(activity); try { mCallbacks = (NavigationDrawerCallbacks) activity; } catch (ClassCastException e) { throw new ClassCastException("Activity must implement NavigationDrawerCallbacks."); } } @Override public void onDetach() { super.onDetach(); mCallbacks = null; } @Override public void onSaveInstanceState(Bundle outState) { super.onSaveInstanceState(outState); outState.putInt(STATE_SELECTED_POSITION, mCurrentSelectedPosition); } @Override public void onConfigurationChanged(Configuration newConfig) { super.onConfigurationChanged(newConfig); // Forward the new configuration the drawer toggle component. mDrawerToggle.onConfigurationChanged(newConfig); } @Override public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) { // If the drawer is open, show the global app actions in the action bar. // See also // showGlobalContextActionBar, which controls the top-left area of the // action bar. if (mDrawerLayout != null && isDrawerOpen()) { // inflater.inflate(R.menu.global, menu); showGlobalContextActionBar(); } super.onCreateOptionsMenu(menu, inflater); } @Override public boolean onOptionsItemSelected(MenuItem item) { if (mDrawerToggle.onOptionsItemSelected(item)) { return true; } // if (item.getItemId() == R.id.action_example) { // Toast.makeText(getActivity(), "Example action.", Toast.LENGTH_SHORT) // .show(); // return true; // } return super.onOptionsItemSelected(item); } /** * Per the navigation drawer design guidelines, updates the action bar to * show the global app 'context', rather than just what's in the current * screen. */ private void showGlobalContextActionBar() { ActionBar actionBar = getActionBar(); actionBar.setDisplayShowTitleEnabled(true); actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_STANDARD); actionBar.setTitle(R.string.app_name); setDrawerIndicatorEnabled(true); } private ActionBar getActionBar() { return ((ActionBarActivity) getActivity()).getSupportActionBar(); } /** * Callbacks interface that all activities using this fragment must * implement. */ public static interface NavigationDrawerCallbacks { /** * Called when an item in the navigation drawer is selected. */ void onLangItemSelected(String courseName, boolean starredOnly); } /** * */ public void setDrawerIndicatorEnabled(boolean enabled) { mDrawerToggle.setDrawerIndicatorEnabled(enabled); } }