http://javawiki.sowas.com/ 2023-11-10T17:53:28+01:00 http://javawiki.sowas.com/ http://javawiki.sowas.com/lib/images/favicon.ico text/html 2012-10-16T15:28:09+01:00 http://javawiki.sowas.com/doku.php?id=en:android:alertdialog&rev=1350394089&do=diff Android android.app.AlertDialog The following example shows a simple alertdialog, how you use him as a security query: AlertDialog alertDlg = new AlertDialog.Builder(this).create(); alertDlg.setTitle("delete"); alertDlg.setMessage("delete really?"); alertDlg.setButton("Yes", new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int which) { // Here, anything can be deleted } }); alertDlg.setButton2("Nein", new DialogInterface.OnClickListener… text/html 2012-10-16T16:39:33+01:00 http://javawiki.sowas.com/doku.php?id=en:android:android&rev=1350398373&do=diff * AlertDialog * center GUI-elements * custom-views with own attributes * dial a phone number * exit apps * fade out front strip (fullscreen) * localhost in the emulator * ProgressDialog * set icon of application * SharedPreferences * sign application * spinner * timer * vibrate * wifi- or mobile connection text/html 2020-01-22T21:00:46+01:00 http://javawiki.sowas.com/doku.php?id=en:android:center-textview&rev=1579723246&do=diff Android A GUI-element can be simply centered through the parameter „gravity“ in the definding XML-file: <TextView android:layout_width="fill_parent" android:layout_height="fill_parent" android:gravity="center_horizontal|center_vertical" android:text="Zentrierter Text" /> text/html 2020-01-22T21:00:45+01:00 http://javawiki.sowas.com/doku.php?id=en:android:custom-view-attributes&rev=1579723245&do=diff Android A CustomView shall be given own values. In the following example a string myString and a number myNumber. In the javacode you get at these values by means of obtainStyledAttributes(..). To that, a file data attrs.xml is compiled in the folder res/values, which defines these attributes: text/html 2020-01-22T21:00:46+01:00 http://javawiki.sowas.com/doku.php?id=en:android:dial&rev=1579723246&do=diff Android public void performDial(){ try { startActivity(new Intent(Intent.ACTION_CALL, Uri.parse("tel:123456789"))); } catch (Exception e) { e.printStackTrace(); } } text/html 2020-01-22T21:00:45+01:00 http://javawiki.sowas.com/doku.php?id=en:android:exit-application&rev=1579723245&do=diff Android An activity is exited with finish(); Is the last activity exited, so the app is as well exited. Often, there stay rests somewhere in the memory, because you haven't programmed entirely neat. From there, it is recommendable to remove text/html 2020-01-22T21:00:45+01:00 http://javawiki.sowas.com/doku.php?id=en:android:fullscreen&rev=1579723245&do=diff Android fade out front bar (fullscreen) To fade out the front bar, in the onCreate-method of the activity the following code must be adapted: public void onCreate(Bundle savedInstanceState) { requestWindowFeature(Window.FEATURE_NO_TITLE); getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN); } text/html 2020-01-22T21:00:45+01:00 http://javawiki.sowas.com/doku.php?id=en:android:icon&rev=1579723245&do=diff Android * create a PNG-image in the sizes 36×36, 48×48 and 72×72 (e.g. icon.png). * save images in the project under res/drawable-hdpi (72×72), res/drawable-mdpi (48×48) and res/drawable-ldpi (32×32). * adapt the entry android:icon=“@drawable/icon“ in the file AndroidManifest.xmln if the name of the icon isn't icon.png. text/html 2020-01-22T21:00:46+01:00 http://javawiki.sowas.com/doku.php?id=en:android:localhost&rev=1579723246&do=diff Android localhost under Android doesn't function. Instead 10.0.2.2 must be used. text/html 2012-10-16T16:12:34+01:00 http://javawiki.sowas.com/doku.php?id=en:android:progressdialog&rev=1350396754&do=diff Android android.app.ProgressDialog The following example shows a simple ProgressDialog, as you need it at longer actions: ProgressDialog progressDlg = ProgressDialog.show(this, "", "Load...", true, false); // Make something here that lasts longer progressDlg.dismiss(); text/html 2012-10-16T16:17:52+01:00 http://javawiki.sowas.com/doku.php?id=en:android:sharedpreferences&rev=1350397072&do=diff Android SharedPreferences With SharedPreferences key/value - pairs can be persisted durable. // read preferences: SharedPreferences pref = Context.getSharedPreferences("MyApplication", MODE_PRIVATE); boolean showHelp = pref.getBoolean("showHelp", true); // save preferences: SharedPreferences.Editor editor = pref.edit(); editor.putBoolean("showHelp", true); editor.commit(); // Important! text/html 2020-01-22T21:00:45+01:00 http://javawiki.sowas.com/doku.php?id=en:android:sign-application&rev=1579723245&do=diff Android keytool -genkey -v -keystore demo.keystore -alias demo -keyalg RSA -validity 10000 text/html 2012-10-16T16:15:06+01:00 http://javawiki.sowas.com/doku.php?id=en:android:spinner&rev=1350396906&do=diff Android android.widget.Spinner The following example shows a spinner (ComboBox): String[] items = {"apple", "pear", "plum"}; Spinner spinner = (Spinner) findViewById(R.id.myspinner); ArrayAdapter<String> adapterCat = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item, items); spinner.setAdapter(adapterCat); spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() { @Override public void onItemSelected(AdapterView<?> arg0, View arg1, int arg2,… text/html 2020-01-22T21:00:45+01:00 http://javawiki.sowas.com/doku.php?id=en:android:timer&rev=1579723245&do=diff Android Timer timer = new Timer(); timer.scheduleAtFixedRate(new TimerTask() { Override public void run() { // ... } }, 1000, 1000); // first number ms to start, second number ms of interval text/html 2020-01-22T21:00:45+01:00 http://javawiki.sowas.com/doku.php?id=en:android:vibrate&rev=1579723245&do=diff Android To let the smartphone vibrate, firstly the authority for that must be written on the AndroidManifest.xml: <uses-permission android:name="android.permission.VIBRATE"/> The vibration is activated with the following call: Vibrator v = (Vibrator) getSystemService(Context.VIBRATOR_SERVICE); v.vibrate(400); // vibrates for 400ms text/html 2020-01-22T21:00:45+01:00 http://javawiki.sowas.com/doku.php?id=en:android:wifi-3g&rev=1579723245&do=diff Android You want to detect which connection is to the internet. The following code can be used for this: ConnectivityManager connManager = (ConnectivityManager) getSystemService(CONNECTIVITY_SERVICE); NetworkInfo niWifi = connManager.getNetworkInfo(ConnectivityManager.TYPE_WIFI); NetworkInfo niMobile = connManager.getNetworkInfo(ConnectivityManager.TYPE_MOBILE); if (niWifi.isAvailable()){ // wifi-connection existing } if (niMobile.isAvailable() == false) { // mobile-net exist…