Java tutorial
/* * Copyright 2013 Michael Boyde Wallace (http://wallaceit.com.au) * This file is part of Reddinator. * * Reddinator is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * Reddinator is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with Reddinator (COPYING). If not, see <http://www.gnu.org/licenses/>. */ package au.com.wallaceit.reddinator; import android.app.ActionBar; import android.app.AlertDialog; import android.appwidget.AppWidgetManager; import android.content.Context; import android.content.DialogInterface; import android.content.Intent; import android.content.SharedPreferences; import android.graphics.Color; import android.net.Uri; import android.os.AsyncTask; import android.os.Bundle; import android.preference.PreferenceManager; import android.support.v4.app.Fragment; import android.support.v4.app.FragmentActivity; import android.view.Menu; import android.view.MenuInflater; import android.view.MenuItem; import android.view.View; import android.view.Window; import android.view.WindowManager; import android.widget.ImageView; import android.widget.TabHost; import android.widget.TabHost.TabContentFactory; import android.widget.Toast; import org.json.JSONException; import org.json.JSONObject; import java.util.HashMap; public class ViewRedditActivity extends FragmentActivity implements TabHost.OnTabChangeListener { private TabHost mTabHost; private HashMap<String, TabInfo> mapTabInfo = new HashMap<String, TabInfo>(); private TabInfo mLastTab = null; private GlobalObjects global; private SharedPreferences prefs; private MenuItem upvote; private MenuItem downvote; private String userLikes = null; // string version of curvote, parsed when options menu generated. private String redditItemId; private int curvote = 0; private int feedposition = 0; private int widgetId = 0; private class TabInfo { private String tag; private Class<TabWebFragment> clss; private Bundle args; private Fragment fragment; TabInfo(String tag, Class<TabWebFragment> clazz, Bundle args) { this.tag = tag; this.clss = clazz; this.args = args; } } class TabFactory implements TabContentFactory { private final Context mContext; /** * @param context; activity context */ public TabFactory(Context context) { mContext = context; } /** * (non-Javadoc) * * @see android.widget.TabHost.TabContentFactory#createTabContent(java.lang.String) */ public View createTabContent(String tag) { View v = new View(mContext); v.setMinimumWidth(0); v.setMinimumHeight(0); return v; } } /** * (non-Javadoc) * * @see android.support.v4.app.FragmentActivity#onCreate(android.os.Bundle) */ protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); global = ((GlobalObjects) ViewRedditActivity.this.getApplicationContext()); prefs = PreferenceManager.getDefaultSharedPreferences(ViewRedditActivity.this); // set window flags getWindow().requestFeature(WindowManager.LayoutParams.FLAG_LAYOUT_NO_LIMITS); getWindow().requestFeature(WindowManager.LayoutParams.FLAG_LAYOUT_IN_SCREEN); // request loading bar first getWindow().requestFeature(Window.FEATURE_PROGRESS); // get actionbar and set home button, pad the icon ActionBar actionBar = getActionBar(); if (actionBar != null) { actionBar.setDisplayHomeAsUpEnabled(true); } ImageView view = (ImageView) findViewById(android.R.id.home); if (view != null) { view.setPadding(5, 0, 5, 0); } // set content view setContentView(R.layout.viewreddit); // Setup TabHost initialiseTabHost(savedInstanceState); if (savedInstanceState != null) { mTabHost.setCurrentTabByTag(savedInstanceState.getString("tab")); //set the tab as per the saved state } redditItemId = getIntent().getStringExtra(WidgetProvider.ITEM_ID); widgetId = getIntent().getIntExtra(AppWidgetManager.EXTRA_APPWIDGET_ID, 0); feedposition = getIntent().getIntExtra("itemposition", 0); // Get selected item from feed and user vote preference JSONObject currentFeedItem = global.getFeedObject(prefs, widgetId, feedposition, redditItemId); try { userLikes = currentFeedItem.getString("likes"); } catch (JSONException e) { e.printStackTrace(); } //System.out.println("User likes post: " + userLikes); } public void onBackPressed() { TabWebFragment webview = (TabWebFragment) mapTabInfo.get(mTabHost.getCurrentTabTag()).fragment; if (webview.mFullSView != null) { webview.mChromeClient.onHideCustomView(); } else if (webview.mWebView.canGoBack()) { webview.mWebView.goBack(); } else { webview.mWebView.stopLoading(); webview.mWebView.loadData("", "text/html", "utf-8"); this.finish(); } } @Override public boolean onCreateOptionsMenu(Menu menu) { MenuInflater inflater = getMenuInflater(); inflater.inflate(R.menu.sharemenu, menu); // set options menu view upvote = menu.findItem(R.id.menu_upvote); downvote = menu.findItem(R.id.menu_downvote); if (userLikes.equals("true")) { upvote.setIcon(R.drawable.upvote_active); curvote = 1; } else if (userLikes.equals("false")) { downvote.setIcon(R.drawable.downvote_active); curvote = -1; } return super.onCreateOptionsMenu(menu); } @Override public boolean onOptionsItemSelected(MenuItem item) { switch (item.getItemId()) { case android.R.id.home: TabWebFragment webview = (TabWebFragment) mapTabInfo.get(mTabHost.getCurrentTabTag()).fragment; webview.mWebView.stopLoading(); webview.mWebView.loadData("", "text/html", "utf-8"); this.finish(); return true; case R.id.menu_upvote: upVote(); break; case R.id.menu_downvote: downVote(); break; case R.id.menu_account: Intent accnIntent = new Intent(ViewRedditActivity.this, AccountWebView.class); startActivity(accnIntent); break; case R.id.menu_open: showOpenDialog(); break; case R.id.menu_share: showShareDialog(); break; default: return super.onOptionsItemSelected(item); } return true; } // Open stuff public void openUrlExternally(String url) { Intent openintent = new Intent(Intent.ACTION_VIEW, Uri.parse(url)); startActivity(openintent); } public void shareText(String txt) { Intent sendintent = new Intent(Intent.ACTION_SEND); sendintent.setAction(Intent.ACTION_SEND); sendintent.putExtra(Intent.EXTRA_TEXT, txt); sendintent.setType("text/plain"); startActivity(Intent.createChooser(sendintent, "Share Url to...")); } public void showOpenDialog() { AlertDialog.Builder builder = new AlertDialog.Builder(ViewRedditActivity.this); builder.setMessage("Open Url").setNegativeButton("Content", new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int id) { openUrlExternally(getIntent().getStringExtra(WidgetProvider.ITEM_URL)); } }).setPositiveButton("Reddit Page", new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int id) { openUrlExternally("http://reddit.com" + getIntent().getStringExtra(WidgetProvider.ITEM_PERMALINK)); } }); // Create the AlertDialog builder.create().show(); } public void showShareDialog() { AlertDialog.Builder builder = new AlertDialog.Builder(ViewRedditActivity.this); builder.setMessage("Share Url").setNegativeButton("Content", new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int id) { shareText(getIntent().getStringExtra(WidgetProvider.ITEM_URL)); } }).setPositiveButton("Reddit Page", new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int id) { shareText("http://reddit.com" + getIntent().getStringExtra(WidgetProvider.ITEM_PERMALINK)); } }); // Create the AlertDialog builder.create().show(); } // VOTING STUFF private boolean voteinprogress = false; public boolean voteInProgress() { return voteinprogress; } private void upVote() { VoteTask task; if (curvote == 1) { task = new VoteTask(feedposition, redditItemId, 0); //System.out.println("Neutral Vote"); } else { task = new VoteTask(feedposition, redditItemId, 1); //System.out.println("Upvote"); } voteinprogress = true; ViewRedditActivity.this.setTitle("Voting..."); task.execute(); } private void downVote() { VoteTask task; if (curvote == -1) { task = new VoteTask(feedposition, redditItemId, 0); //System.out.println("Neutral Vote"); } else { task = new VoteTask(feedposition, redditItemId, -1); //System.out.println("Downvote"); } voteinprogress = true; ViewRedditActivity.this.setTitle("Voting..."); task.execute(); } class VoteTask extends AsyncTask<String, Integer, String> { private String redditid; private int direction; private int feedposition; public VoteTask(int position, String id, int dir) { redditid = id; direction = dir; feedposition = position; } @Override protected String doInBackground(String... strings) { try { return global.mRedditData.vote(redditid, direction); } catch (RedditData.RedditApiException e) { e.printStackTrace(); return e.getMessage(); } } @Override protected void onPostExecute(String result) { ViewRedditActivity.this.setTitle("Reddinator"); // reset title voteinprogress = false; switch (result) { case "OK": curvote = direction; switch (direction) { case -1: upvote.setIcon(R.drawable.upvote); downvote.setIcon(R.drawable.downvote_active); setUpdateRecord("false"); break; case 0: upvote.setIcon(R.drawable.upvote); downvote.setIcon(R.drawable.downvote); setUpdateRecord("null"); break; case 1: upvote.setIcon(R.drawable.upvote_active); downvote.setIcon(R.drawable.downvote); setUpdateRecord("true"); break; } break; case "LOGIN": global.mRedditData.initiateLogin(ViewRedditActivity.this); break; default: // show error Toast.makeText(ViewRedditActivity.this, "API Error: " + result, Toast.LENGTH_LONG).show(); break; } } private void setUpdateRecord(String val) { global.setItemUpdate(feedposition, redditid, val); // save in feed preferences global.setItemVote(prefs, widgetId, feedposition, redditid, val); } } /** * (non-Javadoc) * * @see android.support.v4.app.FragmentActivity#onSaveInstanceState(android.os.Bundle) */ protected void onSaveInstanceState(Bundle outState) { outState.putString("tab", mTabHost.getCurrentTabTag()); //save the tab selected super.onSaveInstanceState(outState); } /** * Step 2: Setup TabHost */ private void initialiseTabHost(Bundle args) { Bundle rargs = new Bundle(); rargs.putBoolean("loadcom", true); //rargs.putString("cookie", global.mRedditData.getSessionCookie()); mTabHost = (TabHost) findViewById(android.R.id.tabhost); mTabHost.setup(); if (prefs.getString("widgetthemepref", "1").equals("1")) { mTabHost.getTabWidget().setBackgroundColor(Color.parseColor("#CEE3F8")); // set light theme } else { mTabHost.getTabWidget().setBackgroundColor(Color.parseColor("#5F99CF")); // set dark theme } // add tabs TabInfo tabInfo; ViewRedditActivity.addTab(this, this.mTabHost, this.mTabHost.newTabSpec("Tab1").setIndicator("Content"), (tabInfo = new TabInfo("Tab1", TabWebFragment.class, args))); this.mapTabInfo.put(tabInfo.tag, tabInfo); ViewRedditActivity.addTab(this, this.mTabHost, this.mTabHost.newTabSpec("Tab2").setIndicator("Reddit"), (tabInfo = new TabInfo("Tab2", TabWebFragment.class, rargs))); this.mapTabInfo.put(tabInfo.tag, tabInfo); // Default to first tab // get shared preferences SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(ViewRedditActivity.this); if (prefs.getBoolean("commentsfirstpref", false)) { this.mTabHost.setCurrentTab(1); this.onTabChanged("Tab2"); // load comments tab first } else { this.onTabChanged("Tab1"); } // set change listener mTabHost.setOnTabChangedListener(this); } /** * @param activity; * @param tabHost; * @param tabSpec; */ private static void addTab(ViewRedditActivity activity, TabHost tabHost, TabHost.TabSpec tabSpec, TabInfo tabInfo) { // Attach a Tab view factory to the spec tabSpec.setContent(activity.new TabFactory(activity)); String tag = tabSpec.getTag(); // Check to see if we already have a fragment for this tab, probably // from a previously saved state. If so, deactivate it, because our // initial state is that a tab isn't shown. tabInfo.fragment = activity.getSupportFragmentManager().findFragmentByTag(tag); if (tabInfo.fragment != null && !tabInfo.fragment.isDetached()) { android.support.v4.app.FragmentTransaction ft = activity.getSupportFragmentManager().beginTransaction(); ft.detach(tabInfo.fragment); ft.commit(); activity.getSupportFragmentManager().executePendingTransactions(); } tabHost.addTab(tabSpec); } /** * (non-Javadoc) * * @see android.widget.TabHost.OnTabChangeListener#onTabChanged(java.lang.String) */ public void onTabChanged(String tag) { TabInfo newTab = this.mapTabInfo.get(tag); if (mLastTab != newTab) { android.support.v4.app.FragmentTransaction ft = this.getSupportFragmentManager().beginTransaction(); if (mLastTab != null) { if (mLastTab.fragment != null) { ft.detach(mLastTab.fragment); } } if (newTab != null) { if (newTab.fragment == null) { newTab.fragment = Fragment.instantiate(this, newTab.clss.getName(), newTab.args); ft.add(R.id.realtabcontent, newTab.fragment, newTab.tag); } else { ft.attach(newTab.fragment); } } mLastTab = newTab; ft.commit(); this.getSupportFragmentManager().executePendingTransactions(); } } }