Cellidwriter class continues here publicvoid write cid

Reading files from resources
• Raw files are processed by aapt and must be referenced from the application using a resource identifier in the R class
• Asset files are compiled into the .apk file as-is and you can navigate this directory in the same way as a typical file system

privatestatic CharSequence readResourceOrAsset(Activity activity /* Context ctx */) {
BufferedReader reader = null;
try {
reader = new BufferedReader(new InputStreamReader(activity.getAssets().open("EULA.txt")));
reader = new BufferedReader(new InputStreamReader(activity.getResources().openRawResource(R.raw.instructions))); String line;
StringBuilder buffer = new StringBuilder();
while ((line = reader.readLine()) != null)
buffer.append(line).append('\n');
return buffer;
} catch (IOException e) {
return"";
} finally {
closeStream(reader);
}
}

• Every application can read and write from/to the SD card (external memory) but needs permissions in AndroidManifest

– Write needs the WRITE_EXTERNAL_STORAGE permission

	irectory
Context.getFilesDir(); // Create or access a directory	Helper methods for the private storage area
	worked, false otherwise ion’s private area in a String array java.io.FileInputStream java.io.FileOutputStream ;

privatevoid writeFileToInternalStorage() {
String eol = System.getProperty("line.separator"); BufferedWriter writer = null;
try {
writer = new BufferedWriter(
new OutputStreamWriter(
openFileOutput("myfile",
MODE_WORLD_WRITEABLE)));
writer.write("This is a test1." + eol);
writer.write("This is a test2." + eol);
} catch (Exception e) {
e.printStackTrace();
}
finally {
if (writer != null) {
try {
writer.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}

privatevoid readFileFromInternalStorage() {
String eol = System.getProperty("line.separator"); BufferedReader input = null;
try {
input = new BufferedReader(
new InputStreamReader(
openFileInput("myfile"))); String line;
StringBuffer buffer = new StringBuffer(); while ((line = input.readLine()) != null) { buffer.append(line + eol);
}
} catch (Exception e) {
e.printStackTrace();
} finally {
if (input != null) {
try {
input.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}

– Use with DIRECTORY_*** to
get the standard directory
locations

• getExternalStorageDirectory()

storage system (it can be unmounted, removed, unformatted etc.)

– Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)

	= null) {
} catch (Exception e) { e.printStackTrace(); } finally { if (reader != null) { try { reader.close();

• Example of EULA, about dialog and recent changes
– Reading files with html tags from res/raw

publicclass MainActivity extends Activity {
privatestaticfinalbooleanLIGHT_THEME = false;
@Override
protectedvoid onCreate(Bundle savedInstanceState) {
// must read theme from settings then recreate(); if i

t should pr

opagate at once after change

if(LIGHT_THEME)
setTheme(R.style.CustomThemeLight); else
setTheme(R.style.CustomThemeDark);

// http://stackoverflow.com/questions/9286822/how-to-f
// in combination with: http://www.intertech.com/Blog/
try {
ViewConfiguration config = ViewConfiguration.get(this); Field menuKeyField = ViewConfiguration.class.g
if(menuKeyField != null) {
menuKeyField.setAccessible(true);
menuKeyField.setBoolean(config, false);
}
}
catch (Exception ex) {
// Ignore
}

orce-use-of Post/Androi

setContentView(R.layout.activity_main);
// Set up the action bar to show a drop down list final ActionBar actionBar = getActionBar();
actionBar.setDisplayShowTitleEnabled(true);
actionBar.setTitle(R.string.app_name);

// only shows once
Eula.show(this);
}

}

erride
publicboolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will // automatically handle clicks on the Home/Up button, s // as you specify a parent activity in AndroidManifest.xml.

publicclass AboutDialog extends Dialog{

privatestatic Context mContext = null;

tv = (TextView) findViewById(R.id.whatsnew_text); ss = Html.fromHtml(readRawTextFile(R.raw.whatsnew)); tv.setText(ss);

neer/a-reusable-about-dialog-for-your-android-apps/ s-supported-by-textview.html */

Linkify.addLinks(tv, Linkify.WEB_URLS); }

publicstatic String readRawTextFile(int id) {
InputStream inputStream = mContext.getResources().openRawR

– See the PhoneStateSampleActivity

Wi-Fi

int lac = location.getLac();	// and LAC (Location Area Code)

// append at end of file

// android does flush() in close()

System.err.println(e.toString() +

e.printStackTrace();

File I/O (byte) streams • FileInputStream, FileOutputStream, InputStream and OutputStream

// How to inflate the object back from the file: FileInputStream fis = context.openFileInput(SAVENAME); ObjectInputStream ois = new ObjectInputStream(is); Flow f = (Flow) ois.readObject(); //the file has not yet been written }

any user interface

 When Android needs to kill applications to save resources, Services has high priority, only second to foreground Activities
 Other components can start and stop the service, it can also stop itself While it is running other components can bind to it (if implemented) Consider using a Service when the application
– performs a lengthy or intensive processing, not requiring user interaction – performs certain tasks at regular intervals, e.g. downloading updates of some content
– performs lengthy operations that shouldn’t be canceled if the application exits, e.g. downloading a large file
– needs to provide data or information services to other applications (without an user interface)

Service 2

 A service runs in the main thread of its hosting process

– Any CPU intensive work or blocking operations should be performed by spawning a worker thread!

– Started (or unbound) - when an application component starts it by calling startService() - runs until it stops itself with stopSelf() or

Creating a simple service
 Declare the service in your Androidmanifest inside the application tag

publicclass SimpleService extends Service { int[] notes = {R.raw.c5, R.raw.b4, R.raw.a4, R.raw.g4}; intNOTE_DURATION = 500; //millisec MediaPlayer m_mediaPlayer; booleanpaused = false; @Override public IBinder onBind(Intent intent) { returnnull; }

m_mediaPlayer = MediaPlayer.create(this, notes[i%4]); m_mediaPlayer.start(); try { Thread.sleep(NOTE_DURATION); } catch (InterruptedException e) { e.printStackTrace(); } i++; } } } } // end SimpleService class

• Subclass of Service that uses a worker thread to handle all start requests, one at a time

long endTime = System.currentTimeMillis() + 5*1000;
while (System.currentTimeMillis() < endTime) {
synchronized (this) {
try {
wait(endTime - System.currentTimeMillis()); } catch (Exception e) {

}	}	}	}		See the example
}	}	}	}		NotificationActivityService