Programming

Download E-books Beginning Android 4 Application Development PDF

Posted On March 29, 2017 at 8:27 am by / Comments Off on Download E-books Beginning Android 4 Application Development PDF

By Wei-Meng Lee

Understand Android OS for either phone and capsule programming

This fast paced creation to the most recent free up of Android OS provides aspiring cellular app builders what they should comprehend to software for modern day preferred Android smartphones and drugs. Android four OS is, for the 1st time, a unmarried resolution for either smartphones and pills, so if you happen to grasp the data during this valuable consultant, you can be good in your strategy to winning improvement for either units. From utilizing actions and intents and developing wealthy consumer interfaces to operating with SMS, messaging APIs, and the Android SDK, what you wish is here.

  • Provides transparent directions sponsored through real-world programming examples
  • Begins with the fundamentals and covers every thing Android four builders want to know for either smartphones and tablets
  • Explains the way to customise actions and intents, create wealthy consumer interfaces, and deal with data
  • Helps you're employed with SMS and messaging APIs, the Android SDK, and utilizing location-based services
  • Details the best way to package deal and submit your purposes to the Android Market

Beginning Android four software Development pares down the main crucial steps you must comprehend so that you can commence developing Android purposes today.

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FileNotFoundException; import java. io. FileOutputStream; import java. io. IOException; import java. io. InputStream; import java. io. OutputStream; import android. app. task; import android. database. Cursor; import android. os. package; import android. widget. Toast; public type DatabasesActivity extends task { /∗∗ referred to as whilst the job is first created. ∗/ @Override public void onCreate(Bundle savedInstanceState) { tremendous. onCreate(savedInstanceState); setContentView(R. format. main); DBAdapter db = new DBAdapter(this); try out { String destPath = "/data/data/" + getPackageName() + "/databases"; dossier f = new File(destPath); if (! f. exists()) { f. mkdirs(); f. createNewFile(); //---copy the db from the resources folder into // the databases folder--- CopyDB(getBaseContext(). getAssets(). open("mydb"), new FileOutputStream(destPath + "/MyDB")); } } capture (FileNotFoundException e) { e. printStackTrace(); } seize (IOException e) { e. printStackTrace(); } //---get all contacts--- db. open(); Cursor c = db. getAllContacts(); if (c. moveToFirst()) { do { DisplayContact(c); } whereas (c. moveToNext()); } db. close(); } public void CopyDB(InputStream inputStream, OutputStream outputStream) throws IOException { //---copy 1K bytes at a time--- byte[] buffer = new byte[1024]; int size; whereas ((length = inputStream. read(buffer)) > zero) { outputStream. write(buffer, zero, length); } inputStream. close(); outputStream. close(); } public void DisplayContact(Cursor c) { Toast. makeText(this, "id: " + c. getString(0) + "n" + "Name: " + c. getString(1) + "n" + "Email: " + c. getString(2), Toast. LENGTH_LONG). show(); } } three. Press F11 to debug the applying at the Android emulator. whilst the appliance runs, it is going to replica the mydb database dossier into the /data/data/net. learn2develop. Databases/databases/ folder with the identify MyDB. the way it Works You first outlined the CopyDB() strategy to replica the database dossier from one situation to a different: public void CopyDB(InputStream inputStream, OutputStream outputStream) throws IOException { //---copy 1K bytes at a time--- byte[] buffer = new byte[1024]; int size; whereas ((length = inputStream. read(buffer)) > zero) { outputStream. write(buffer, zero, length); } inputStream. close(); outputStream. close(); } be aware that during this situation you used the InputStream item to learn from the resource dossier, after which wrote it to the vacation spot dossier utilizing the OutputStream item. while the task is created, you replica the database dossier positioned within the resources folder into the /data/data/net. learn2develop. Databases/databases/ folder at the Android equipment (or emulator): try out { String destPath = "/data/data/" + getPackageName() + "/databases"; dossier f = new File(destPath); if (! f. exists()) { f. mkdirs(); f. createNewFile(); //---copy the db from the resources folder into // the databases folder--- CopyDB(getBaseContext(). getAssets(). open("mydb"), new FileOutputStream(destPath + "/MyDB")); } } trap (FileNotFoundException e) { e. printStackTrace(); } capture (IOException e) { e. printStackTrace(); } You reproduction the database dossier provided that it doesn't exist within the vacation spot folder.

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