Download E-books Beginning Android 2 PDF

By Mark Murphy

The Android improvement platform, created by way of Google and the Open Handset Alliance, is a platform in its truest experience, encompassing hundreds and hundreds of sessions past the conventional Java periods and open resource elements that send with the SDK.

With Beginning Android 2, you’ll tips on how to boost purposes for Android 2.x cellular units, utilizing uncomplicated examples which are able to run together with your reproduction of the software program improvement equipment. writer, Android columnist, author, developer, and group suggest Mark L. Murphy will exhibit you what you want to understand to start programming Android purposes, together with the best way to craft graphical consumer interfaces, use GPS, and entry internet services.

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Selection); } public void onListItemClick(ListView dad or mum, View v, int place, lengthy identity) { choice. setText(items[position]); } } This follows the overall constitution for the former ListView pattern. the foremost distinction is that we've got instructed ArrayAdapter that we wish to use our customized format (R. format. row) and that the TextView the place the observe should still move is called R. identity. label inside of that customized format. be aware: keep in mind that to reference a format (row. xml), use R. structure as a prefix at the base identify of the format XML dossier (R. structure. row). the result's a ListView with icons down the left part. accordingly, all of the icons are an analogous, as proven in determine 8–1. bankruptcy eight: Getting Fancy with Lists determine 8–1. The StaticDemo software A Dynamic Presentation offering another format to take advantage of for rows, as within the previous instance, handles basic instances very properly. even if, it falls down in case you have extra advanced situations to your rows, comparable to the subsequent:  no longer each row makes use of an identical structure (e. g. , a few rows one line of textual content and others have two).  you must configure the widgets within the rows (e. g. , use diversified icons for various cases). In these situations, the higher alternative is to create your personal subclass of your required Adapter, override getView(), and build your rows your self. The getView() process is liable for returning a View, representing the row for the provided place within the adapter facts. to illustrate, let’s remodel the code proven within the prior part to exploit getView(), so that you can convey diverse icons for rows. We’ll use one icon for brief phrases and one for lengthy phrases (from the FancyLists/Dynamic pattern project). public category DynamicDemo extends ListActivity { TextView choice; String[] items={"lorem", "ipsum", "dolor", "sit", "amet", "consectetuer", "adipiscing", "elit", "morbi", "vel", "ligula", "vitae", "arcu", "aliquet", "mollis", "etiam", "vel", "erat", "placerat", "ante", "porttitor", "sodales", "pellentesque", "augue", "purus"}; seventy seven 78 bankruptcy eight: Getting Fancy with Lists @Override public void onCreate(Bundle icicle) { great. onCreate(icicle); setContentView(R. structure. main); setListAdapter(new IconicAdapter()); selection=(TextView)findViewById(R. identity. selection); } public void onListItemClick(ListView mother or father, View v, int place, lengthy identification) { choice. setText(items[position]); } category IconicAdapter extends ArrayAdapter { IconicAdapter() { super(DynamicDemo. this, R. structure. row, items); } public View getView(int place, View convertView, ViewGroup guardian) { LayoutInflater inflater=getLayoutInflater(); View row=inflater. inflate(R. format. row, mum or dad, false); TextView label=(TextView)row. findViewById(R. identification. label); label. setText(items[position]); ImageView icon=(ImageView)row. findViewById(R. identity. icon); if (items[position]. length()>4) { icon. setImageResource(R. drawable. delete); } else { icon. setImageResource(R. drawable. ok); } return(row); } } } the idea is that we override getView() and go back rows according to which item is being displayed, the place the thing is indicated via a place index into the Adapter.

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