Java tutorial
/* * Copyright 2012 Google Inc. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package net.abcdroid.devfest12.util; import net.abcdroid.devfest12.R; import android.app.AlertDialog; import android.app.Dialog; import android.content.Context; import android.content.DialogInterface; import android.content.SharedPreferences; import android.content.pm.PackageInfo; import android.content.pm.PackageManager; import android.content.res.Resources; import android.graphics.drawable.Drawable; import android.os.AsyncTask; import android.os.Bundle; import android.preference.PreferenceManager; import android.support.v4.app.DialogFragment; import android.support.v4.app.Fragment; import android.support.v4.app.FragmentActivity; import android.support.v4.app.FragmentManager; import android.support.v4.app.FragmentTransaction; import android.text.Html; import android.text.SpannableString; import android.text.SpannableStringBuilder; import android.text.method.LinkMovementMethod; import android.text.style.ClickableSpan; import android.view.LayoutInflater; import android.view.View; import android.webkit.WebView; import android.widget.TextView; /** * A set of helper methods for showing contextual help information in the app. */ public class HelpUtils { public static boolean hasSeenTutorial(final Context context, String id) { SharedPreferences sp = PreferenceManager.getDefaultSharedPreferences(context); return sp.getBoolean("seen_tutorial_" + id, false); } private static void setSeenTutorial(final Context context, final String id) { //noinspection unchecked new AsyncTask<Void, Void, Void>() { @Override protected Void doInBackground(Void... voids) { SharedPreferences sp = PreferenceManager.getDefaultSharedPreferences(context); sp.edit().putBoolean("seen_tutorial_" + id, true).commit(); return null; } }.execute(); } public static void maybeShowAddToScheduleTutorial(FragmentActivity activity) { if (hasSeenTutorial(activity, "add_to_schedule")) { return; } // DialogFragment.show() will take care of adding the fragment // in a transaction. We also want to remove any currently showing // dialog, so make our own transaction and take care of that here. FragmentManager fm = activity.getSupportFragmentManager(); FragmentTransaction ft = fm.beginTransaction(); Fragment prev = fm.findFragmentByTag("dialog_add_to_schedule"); if (prev != null) { ft.remove(prev); } ft.addToBackStack(null); new AddToScheduleTutorialDialog().show(ft, "dialog_add_to_schedule"); setSeenTutorial(activity, "add_to_schedule"); } public static class AddToScheduleTutorialDialog extends DialogFragment implements Html.ImageGetter { public AddToScheduleTutorialDialog() { } @Override public Dialog onCreateDialog(Bundle savedInstanceState) { LayoutInflater layoutInflater = (LayoutInflater) getActivity() .getSystemService(Context.LAYOUT_INFLATER_SERVICE); TextView tutorialBodyView = (TextView) layoutInflater.inflate(R.layout.dialog_tutorial_message, null); tutorialBodyView.setText(Html.fromHtml(getString(R.string.help_add_to_schedule), this, null)); tutorialBodyView.setContentDescription(Html.fromHtml(getString(R.string.help_add_to_schedule_alt))); return new AlertDialog.Builder(getActivity()).setView(tutorialBodyView) .setPositiveButton(R.string.ok, new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int whichButton) { dialog.dismiss(); } }).create(); } @Override public Drawable getDrawable(String url) { if ("add_to_schedule".equals(url)) { Resources res = getActivity().getResources(); Drawable d = res.getDrawable(R.drawable.help_add_to_schedule); d.setBounds(0, 0, d.getIntrinsicWidth(), d.getIntrinsicHeight()); return d; } return null; } } public static void showAbout(FragmentActivity activity) { FragmentManager fm = activity.getSupportFragmentManager(); FragmentTransaction ft = fm.beginTransaction(); Fragment prev = fm.findFragmentByTag("dialog_about"); if (prev != null) { ft.remove(prev); } ft.addToBackStack(null); new AboutDialog().show(ft, "dialog_about"); } public static class AboutDialog extends DialogFragment { private static final String VERSION_UNAVAILABLE = "N/A"; public AboutDialog() { } @Override public Dialog onCreateDialog(Bundle savedInstanceState) { // Get app version PackageManager pm = getActivity().getPackageManager(); String packageName = getActivity().getPackageName(); String versionName; try { PackageInfo info = pm.getPackageInfo(packageName, 0); versionName = info.versionName; } catch (PackageManager.NameNotFoundException e) { versionName = VERSION_UNAVAILABLE; } // Build the about body view and append the link to see OSS licenses SpannableStringBuilder aboutBody = new SpannableStringBuilder(); aboutBody.append(Html.fromHtml(getString(R.string.about_body, versionName))); SpannableString licensesLink = new SpannableString(getString(R.string.about_licenses)); licensesLink.setSpan(new ClickableSpan() { @Override public void onClick(View view) { HelpUtils.showOpenSourceLicenses(getActivity()); } }, 0, licensesLink.length(), 0); aboutBody.append("\n\n"); aboutBody.append(licensesLink); SpannableString eulaLink = new SpannableString(getString(R.string.about_eula)); eulaLink.setSpan(new ClickableSpan() { @Override public void onClick(View view) { HelpUtils.showEula(getActivity()); } }, 0, eulaLink.length(), 0); aboutBody.append("\n\n"); aboutBody.append(eulaLink); LayoutInflater layoutInflater = (LayoutInflater) getActivity() .getSystemService(Context.LAYOUT_INFLATER_SERVICE); TextView aboutBodyView = (TextView) layoutInflater.inflate(R.layout.dialog_about, null); aboutBodyView.setText(aboutBody); aboutBodyView.setMovementMethod(new LinkMovementMethod()); return new AlertDialog.Builder(getActivity()).setTitle(R.string.title_about).setView(aboutBodyView) .setPositiveButton(R.string.ok, new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int whichButton) { dialog.dismiss(); } }).create(); } } public static void showOpenSourceLicenses(FragmentActivity activity) { FragmentManager fm = activity.getSupportFragmentManager(); FragmentTransaction ft = fm.beginTransaction(); Fragment prev = fm.findFragmentByTag("dialog_licenses"); if (prev != null) { ft.remove(prev); } ft.addToBackStack(null); new OpenSourceLicensesDialog().show(ft, "dialog_licenses"); } public static class OpenSourceLicensesDialog extends DialogFragment { public OpenSourceLicensesDialog() { } @Override public Dialog onCreateDialog(Bundle savedInstanceState) { WebView webView = new WebView(getActivity()); webView.loadUrl("file:///android_asset/licenses.html"); return new AlertDialog.Builder(getActivity()).setTitle(R.string.about_licenses).setView(webView) .setPositiveButton(R.string.ok, new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int whichButton) { dialog.dismiss(); } }).create(); } } public static void showEula(FragmentActivity activity) { FragmentManager fm = activity.getSupportFragmentManager(); FragmentTransaction ft = fm.beginTransaction(); Fragment prev = fm.findFragmentByTag("dialog_eula"); if (prev != null) { ft.remove(prev); } ft.addToBackStack(null); new EulaDialog().show(ft, "dialog_eula"); } public static class EulaDialog extends DialogFragment { public EulaDialog() { } @Override public Dialog onCreateDialog(Bundle savedInstanceState) { int padding = getResources().getDimensionPixelSize(R.dimen.content_padding_normal); TextView eulaTextView = new TextView(getActivity()); eulaTextView.setText(Html.fromHtml(getString(R.string.eula_text))); eulaTextView.setMovementMethod(LinkMovementMethod.getInstance()); eulaTextView.setPadding(padding, padding, padding, padding); return new AlertDialog.Builder(getActivity()).setTitle(R.string.about_eula).setView(eulaTextView) .setPositiveButton(R.string.ok, new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int whichButton) { dialog.dismiss(); } }).create(); } } }