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10 Chapter 8 Networkig Social Networkig Twitter is a social etworkig ad microbloggig service that eables its users to sed ad read messages kow as tweets.

1 10 Chapter 8 Networkig Social Networkig Twitter is a social etworkig ad microbloggig service that eables its users to sed ad read messages kow as tweets.twitter is described as SMS of the Iteret, ad ideed, each tweet caot exceed 140 characters.twitter users ca follow other people s tweets or be followed by others. Recipe: Itegratig with Twitter Some third-party libraries exist to assist i itegratig Twitter ito a Adroid applicatio (from Twitter4J by Yusuke Yamamoto A ope-sourced, maveized, ad Google App Egie-safe Java library for the Twitter API, released uder the BSD licese java-twitter by DeWitt Clito Pure Java iterface for the Twitter API jtwitter by Daiel Witerstei Ope-source pure Java iterface to Twitter Twitter Cliet by Gist, Ic. Java cliet to coect to the streamig API For this recipe, the Twitter4J library by Yusuke Yamamoto is used, which has documetatio at recipe eables users to log i to Twitter ad make a tweet.at the same time, it retrieves ay updated tweets ad displays them to the scree. There are two screes to specify: the logi scree ad update status scree (see Figure 8.2).Also o the update status scree uder the EditText box, the latest status from the user accout is displayed.the two activities (oe for each scree) ad Iteret permissios eed to be declared i the AdroidMaifest XML file, as show i Listig 8.7. Figure 8.2 The logi Dowload (left) ad tweets from (right) from the Twitter recipe.

2 Social Networkig 211 Listig 8.7 AdroidMaifest.xml <?xml versio="1.0" ecodig="utf-8"?> <maifest xmls:adroid=" package="com.cookbook.twitter" adroid:versiocode="1" adroid:versioname="1.0"> <applicatio <activity adroid:ame=".twittercookbook" <itet-filter> <actio adroid:ame="adroid.itet.actio.main" <category adroid:ame="adroid.itet.category.launcher" </itet-filter> </activity> <activity adroid:ame=".updateadlist" </applicatio> <uses-permissio adroid:ame="adroid.permissio.internet" </maifest> The layout files eeded are logi.xml The logi scree, as show i Listig 8.8 mai.xml The scree to update the status ad display the home status, as show i Listig 8.9 usertimelierow.xml The view for display of each status timelie, as show i Listig 8.10 Listig 8.8 res/layout/logi.xml <?xml versio="1.0" ecodig="utf-8"?> <LiearLayout xmls:adroid=" adroid:orietatio="vertical" adroid:layout_height="fill_paret" > <TextView adroid:text="userame" <EditText adroid:id="@+id/usertext" adroid:siglelie="true"

3 12 Chapter 8 Networkig <TextView adroid:text="password" <EditText adroid:id="@+id/passwordtext" adroid:password="true" adroid:siglelie="true" <Butto adroid:id="@+id/logibutto" adroid:layout_width="wrap_cotet" adroid:text="logi" adroid:textsize="20dp" </LiearLayout> Listig 8.9 res/layout/mai.xml <?xml versio="1.0" ecodig="utf-8"?> <LiearLayout xmls:adroid=" adroid:orietatio="vertical" adroid:layout_height="fill_paret" adroid:backgroud="@drawable/twitter"> <TextView adroid:text="what is i your mid?" <EditText adroid:id="@+id/userstatus" <Butto adroid:id="@+id/updatebutto" adroid:layout_width="wrap_cotet" adroid:text="update" adroid:textsize="20dp"

4 Social Networkig 213 <ListView adroid:dividerheight="1px" adroid:layout_height="fill_paret" adroid:id="list </LiearLayout> Listig 8.10 res/layout/usertimelierow.xml <?xml versio="1.0" ecodig="utf-8"?> <LiearLayout adroid:layout_width="wrap_cotet" adroid:orietatio="vertical" xmls:adroid=" adroid:paddig="12dip"> <TextView adroid:layout_width="wrap_cotet" adroid:layout_margiright="4dp" adroid:text="diary Title " adroid:textstyle="bold" adroid:textsize="16dip" <TextView adroid:layout_width="wrap_cotet" adroid:text="date Recorded" adroid:textsize="14dip" </LiearLayout> The two activities eeded are the logi to Twitter activity ad the update ad list tweets activity.the logi activity is show i Listig It cotais a EditText object for userame ad password, Butto object to submit the logi data, SharedPrefereces object to save the logi iformatio upo iitial successful logi, ad Twitter object from the twitter4j library. Upo startup, the applicatio checks for logi iformatio from SharedPrefereces ad if available, it prepopulates the EditText boxes.whe the user clicks o the Butto, it iitiates the Twitter object with the userame ad password from the EditText boxes. After the Twitter object is iitiated, it tries to call getfollowersids() to verify if the logi is valid. If the logi is ivalid, a exceptio is throw, ad i this example, it shows a Toast message for logi failure.

5 14 Chapter 8 Networkig Listig 8.11 src/com/cookbook/twitter/twittercookbook.java package com.cookbook.twitter; import twitter4j.twitter; import twitter4j.twitterfactory; import adroid.app.activity; import adroid.cotet.itet; import adroid.cotet.sharedprefereces; import adroid.cotet.sharedprefereces.editor; import adroid.os.budle; import adroid.preferece.preferecemaager; import adroid.view.view; import adroid.view.view.oclicklisteer; import adroid.widget.butto; import adroid.widget.edittext; import adroid.widget.toast; public class TwitterCookBook exteds Activity { SharedPrefereces myprefs; EditText useret, passwordet; Butto logibt; static Twitter twitter; public void ocreate(budle savedistacestate) { super.ocreate(savedistacestate); myprefs = PrefereceMaager.getDefaultSharedPrefereces(this); fial Strig userame = myprefs.getstrig("userame", ull); fial Strig password = myprefs.getstrig("password", ull); setcotetview(r.layout.logi); useret = (EditText)fidViewById(R.id.userText); passwordet = (EditText)fidViewById(R.id.passwordText); logibt = (Butto)fidViewById(R.id.logiButto); useret.settext(userame); passwordet.settext(password); logibt.setoclicklisteer(ew OClickListeer() { public void oclick(view v) { try { twitter = ew TwitterFactory().getIstace(userET.getText().toStrig(), passwordet.gettext().tostrig()); twitter.getfollowersids();

6 Social Networkig 215 Itet i = ew Itet(TwitterCookBook.this, UpdateAdList.class); startactivity(i); Editor ed = myprefs.edit(); ed.putstrig("userame",useret.gettext().tostrig()); ed.putstrig("password", passwordet.gettext().tostrig()); ed.commit(); fiish(); ); catch (Exceptio e) { e.pritstacktrace(); Toast.makeText(TwitterCookBook.this, "logi failed!!", Toast.LENGTH_SHORT).show(); After the logi is passed, the UpdateAdList activity is started.as show i Listig 8.12, it cotais a EditText object for the user to eter their tweet, a Butto object to submit the tweet to the Twitter server, a Twitter object from the twitter4j library, a ResposeList of status for holdig the data retured from the Twitter object, ad a custom adapter for maagig the status data. The activity calls the gethometimelie() to retrieve the timelie status show o the Twitter home page whe a user logs i. Note that all Iteret access fuctio calls are placed iside a AsycTask to avoid hagig the UI thread.the gethometimelie() method is called every time the user submits a tweet ad updates the data adapter. To hold status data i a ListView format, the activity is exteded as ListActivity. Iside the ListActivity, a custom BaseAdapter called UserTimeLieAdapter is defied.this adapter uses ResposeList<Status> usertimelie to display the data i ListView. The ListActivity has two AsycTask classes: setup ad loadstatus.they both call the same operatio gethometimelie().the oly differece is that setup tries to iitiate the adapter ad set the ListActivity with UserTimeLieAdapter, whereas loadstatus just otifies the UserTimeLieAdapter that data is chaged. Listig 8.12 src/com/cookbook/twitter/updateadlist.java package com.cookbook.twitter; import twitter4j.resposelist; import twitter4j.status; import twitter4j.twitter;

7 16 Chapter 8 Networkig import adroid.app.listactivity; import adroid.cotet.cotext; import adroid.os.asyctask; import adroid.os.budle; import adroid.util.log; import adroid.view.layoutiflater; import adroid.view.view; import adroid.view.viewgroup; import adroid.view.view.oclicklisteer; import adroid.widget.baseadapter; import adroid.widget.butto; import adroid.widget.edittext; import adroid.widget.textview; public class UpdateAdList exteds ListActivity { EditText useret; Butto updatebt; Twitter twitter; ResposeList<Status> usertimelie; UserTimeLieAdapter myadapter; public void ocreate(budle savedistacestate) { super.ocreate(savedistacestate); setcotetview(r.layout.mai); useret = (EditText)fidViewById(R.id.userStatus); updatebt = (Butto)fidViewById(R.id.updateButto); twitter = TwitterCookBook.twitter; setup stup = ew setup(); stup.execute(); updatebt.setoclicklisteer(ew OClickListeer() { public void oclick(view v) { try { twitter.updatestatus(useret.gettext().tostrig()); loadstatus ldstatus = ew loadstatus(); ldstatus.execute(); useret.settext(""); catch (Exceptio e) { e.pritstacktrace(); );

8 Social Networkig 217 private class UserTimeLieAdapter exteds BaseAdapter{ private LayoutIflater miflater; public UserTimeLieAdapter(Cotext cotext) { miflater = LayoutIflater.from(cotext); public it getcout() { retur usertimelie.size(); public Status getitem(it i) { retur usertimelie.get(i); public log getitemid(it i) { retur i; public View getview(it arg0, View arg1, ViewGroup arg2) { fial ViewHolder holder; View v = arg1; if ((v == ull) (v.gettag() == ull)) { v = miflater.iflate(r.layout.usertimelierow, ull); holder = ew ViewHolder(); holder.mname = (TextView)v.fidViewById(R.id.ame); holder.mstatus = (TextView)v.fidViewById(R.id.msg); v.settag(holder); else { holder = (ViewHolder) v.gettag(); holder.status= getitem(arg0); holder.mname.settext(holder.status.getuser().getname()); holder.mstatus.settext(holder.status.gettext()); v.settag(holder); retur v;

9 18 Chapter 8 Networkig public class ViewHolder { Status status; TextView mname; TextView mstatus; private class setup exteds AsycTask<Strig, Iteger, Strig> { protected Strig doibackgroud(strig... searchkey) { try{ usertimelie = twitter.gethometimelie(); retur ""; catch(exceptio e){ Log.v("Exceptio Twitter query", "Exceptio:"+e.getMessage()); retur ""; protected void opostexecute(strig result) { try { myadapter = ew UserTimeLieAdapter(UpdateAdList.this); UpdateAdList.this.setListAdapter(myAdapter); catch(exceptio e) { Log.v("Exceptio Twitter query", "Exceptio:"+e.getMessage()); private class loadstatus exteds AsycTask<Strig, Iteger, Strig> { protected Strig doibackgroud(strig... searchkey) { try { usertimelie = twitter.gethometimelie(); retur ""; catch(exceptio e) { Log.v("Exceptio Twitter query", "Exceptio:"+e.getMessage()); retur "";

10 Social Networkig 219 protected void opostexecute(strig result) { try { myadapter.otifydatasetchaged(); catch(exceptio e) { Log.v("Exceptio twitter query", "Exceptio:"+e.getMessage());

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