emo | Blog for programming languages

Android How To Make Text Input Dialog

emo08.04.2017

private void showTextDialog(){
        AlertDialog.Builder builder = new AlertDialog.Builder(this);
        builder.setTitle("Enter Text");

// Set up the input
        final EditText input = new EditText(this);
// Specify the type of input expected; this, for example, sets the input as a password, and will mask the text
        input.setInputType(InputType.TYPE_CLASS_TEXT | InputType.TYPE_TEXT_VARIATION_NORMAL);
        builder.setView(input);

// Set up the buttons
        builder.setPositiveButton("OK", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                EnteredText= input.getText().toString();
                do some with EnteredText
            }
        });
        builder.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                dialog.cancel();
            }
        });

        builder.show();
    }

private void showTextDialog(){

AlertDialog.Builder builder = new AlertDialog.Builder(this);

builder.setTitle("Enter Text");

// Set up the input

final EditText input = new EditText(this);

// Specify the type of input expected; this, for example, sets the input as a password, and will mask the text

input.setInputType(InputType.TYPE_CLASS_TEXT | InputType.TYPE_TEXT_VARIATION_NORMAL);

builder.setView(input);

// Set up the buttons

builder.setPositiveButton("OK", new DialogInterface.OnClickListener() {

@Override

public void onClick(DialogInterface dialog, int which) {

EnteredText= input.getText().toString();

do some with EnteredText

}

});

builder.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {

@Override

public void onClick(DialogInterface dialog, int which) {

dialog.cancel();

}

});

builder.show();

}

Android Get WiFi Strength Percentage

emo08.04.201708.04.2017

public static int getWifiStrengthPercentage(Context context)
    {
        try
        {
            WifiManager wifiManager = (WifiManager)context.getSystemService(Context.WIFI_SERVICE);
            int rssi = wifiManager.getConnectionInfo().getRssi();
            int level = WifiManager.calculateSignalLevel(rssi, 10);
            int percentage = (int) ((level/10.0)*100);
            return percentage;
        }
        catch (Exception e)
        {
            return 0;
        }
    }

public static int getWifiStrengthPercentage(Context context)

{

try

{

WifiManager wifiManager = (WifiManager)context.getSystemService(Context.WIFI_SERVICE);

int rssi = wifiManager.getConnectionInfo().getRssi();

int level = WifiManager.calculateSignalLevel(rssi, 10);

int percentage = (int) ((level/10.0)*100);

return percentage;

}

catch (Exception e)

{

return 0;

}

To work this function in your AndroidMainfest add lines:

Android check Wireless (WiFi) Connected

emo08.04.201708.04.2017

   protected boolean isWiFiConnected(){
        try {
            ConnectivityManager connMgr = (ConnectivityManager)
                    getSystemService(Context.CONNECTIVITY_SERVICE);
            NetworkInfo networkInfo = connMgr.getActiveNetworkInfo();
            if (networkInfo != null && networkInfo.isConnected()) {

                return true;
            } else {
                Toast.makeText(this,
                        "No WIFI Connection!", Toast.LENGTH_SHORT).show();
                return false;

            }
        }catch (Exception ex){
            Toast.makeText(this,
                    ex.toString(), Toast.LENGTH_LONG).show();
            System.err.println(ex.toString());
            return false;
        }
    }

protected boolean isWiFiConnected(){

try {

ConnectivityManager connMgr = (ConnectivityManager)

getSystemService(Context.CONNECTIVITY_SERVICE);

NetworkInfo networkInfo = connMgr.getActiveNetworkInfo();

if (networkInfo != null && networkInfo.isConnected()) {

return true;

} else {

Toast.makeText(this,

"No WIFI Connection!", Toast.LENGTH_SHORT).show();

return false;

}

}catch (Exception ex){

Toast.makeText(this,

ex.toString(), Toast.LENGTH_LONG).show();

System.err.println(ex.toString());

return false;

}

To work this function in your AndroidMainfest add lines:

Android how to phone or tablet Vibrate programmatically

emo04.04.201708.04.2017

first step is in file AndroidManifest.xml put line

uses-permission android:name="android.permission.VIBRATE";

1	uses-permission android:name="android.permission.VIBRATE";

in your code put this function:

protected void vibrate(int interval){
       Vibrator vibe = (Vibrator) getSystemService(Context.VIBRATOR_SERVICE);
       vibe.vibrate(interval);
   }

protected void vibrate(int interval){

Vibrator vibe = (Vibrator) getSystemService(Context.VIBRATOR_SERVICE);

vibe.vibrate(interval);

}

good interval is between and 50 and 100

Android convert Dip to Pixels

emo04.04.201708.04.2017

There is routines to pixels from dip and back from resolution

   public int dpToPx(int dp) {
        DisplayMetrics displayMetrics = context.getResources().getDisplayMetrics();
        int px = Math.round(dp * (displayMetrics.xdpi / DisplayMetrics.DENSITY_DEFAULT));
        return px;
    }

    public int pxToDp(int px) {
        DisplayMetrics displayMetrics = context.getResources().getDisplayMetrics();
        int dp = Math.round(px / (displayMetrics.xdpi / DisplayMetrics.DENSITY_DEFAULT));
        return dp;
    }

public int dpToPx(int dp) {

DisplayMetrics displayMetrics = context.getResources().getDisplayMetrics();

int px = Math.round(dp * (displayMetrics.xdpi / DisplayMetrics.DENSITY_DEFAULT));

return px;

}

public int pxToDp(int px) {

DisplayMetrics displayMetrics = context.getResources().getDisplayMetrics();

int dp = Math.round(px / (displayMetrics.xdpi / DisplayMetrics.DENSITY_DEFAULT));

return dp;

}

Delphi how to store button in StringGrid

emo27.03.2015

I have StringGrid having buttons in table for some actions… There is my way to show buttons in grid: first is to fill table with cell values… secound is to assign cell with button var b:TspeedButton; r:Trect; begin r:= StringGrid1.CellRect(1,1); b:=TSpeedButton.Create(StringGrid1); b.Parent:=StringGrid1; b.Top:=r.Top; b.Left:=r.Left; b.Height:=r.Bottom-r.Top; b.Width:=r.right-r.right; b.Visible:=true; b.Caption:=’Test’; b.OnClick:=SpeedButtonClick; StringGrid1.Objects[col,i]:=b; StringGrid1.InvalidateCell(1,1); end;

Delphi how to make license server for bussines software…

emo14.02.2015

any idea?…. NO… wait for solution soon…

delphi start only one instance of application

emo14.02.201519.02.2015

This smample show how to start only one instance of software per client machine first in Your myapplication.dpr write this code:

program myProject;

uses
  Forms,
  Windows,
  Dialogs,
// other forms initialization...

var
  Mutex: THandle;

begin
  Mutex := CreateMutex (nil, True, 'Cashier2010');
  if (Mutex = 0) or (GetLastError = ERROR_ALREADY_EXISTS) then
  begin
    ShowMessage ('Application is active');
  end
  else
  begin
    Application.Initialize;
  ..//create form and run
  end;
end.

program myProject;

uses

Forms,

Windows,

Dialogs,

// other forms initialization...

var

Mutex: THandle;

begin

Mutex := CreateMutex (nil, True, 'Cashier2010');

if (Mutex = 0) or (GetLastError = ERROR_ALREADY_EXISTS) then

begin

ShowMessage ('Application is active');

end

else

begin

Application.Initialize;

..//create form and run

end;

end.

Delphi check for valid entered email, works on android

emo08.01.2015

This function checks whether the supplied string is a valid email. Code worked on Win32 platform and ANDROID Compiler.

function IsValidEmail(const Value: string): Boolean;

  function CheckAllowed(const s: string): Boolean;
  var i: Integer;
  begin
    Result:= false;
    {$IFDEF ANDROID}
    for i:= 0 to Length(s)-1 do
    {$ENDIF}
    {$IFDEF WIN32}
    for i:= 1 to Length(s) do
    {$ENDIF}
     begin
      if not (s[i] in ['a'..'z',
                       'A'..'Z',
                       '0'..'9',
                       '_',
                       '-',
                       '.'])
                       then
                          Exit;
     end;
    Result:= true;
  end;

var
  i: Integer;
  NamePart, ServerPart: string;
begin
  Result:= False;
  i:=Pos('@', Value);
  if i=0 then Exit;
  NamePart:=Copy(Value, 1, i-1);
  ServerPart:=Copy(Value, i+1, Length(Value));
  if (Length(NamePart)=0) or ((Length(ServerPart)<3)) then Exit;
  i:=Pos('.', ServerPart);
  if (i=0) or (i>(Length(serverPart)-2)) then Exit;
  Result:= CheckAllowed(NamePart) and CheckAllowed(ServerPart);
end;

function IsValidEmail(const Value: string): Boolean;

function CheckAllowed(const s: string): Boolean;

var i: Integer;

begin

Result:= false;

{$IFDEF ANDROID}

for i:= 0 to Length(s)-1 do

{$ENDIF}

{$IFDEF WIN32}

for i:= 1 to Length(s) do

{$ENDIF}

begin

if not (s[i] in ['a'..'z',

'A'..'Z',

'0'..'9',

'_',

'-',

'.'])

then

Exit;

end;

Result:= true;

end;

var

i: Integer;

NamePart, ServerPart: string;

begin

Result:= False;

i:=Pos('@', Value);

if i=0 then Exit;

NamePart:=Copy(Value, 1, i-1);

ServerPart:=Copy(Value, i+1, Length(Value));

if (Length(NamePart)=0) or ((Length(ServerPart)<3)) then Exit;

i:=Pos('.', ServerPart);

if (i=0) or (i>(Length(serverPart)-2)) then Exit;

Result:= CheckAllowed(NamePart) and CheckAllowed(ServerPart);

end;

PHP translate shorth month name

emo05.01.2015

This procedure sow how to translate in own language short month names

function getshortmonthname($month)
{
    $months = array(
        1 => "Яну",
        2 => "Фев",
        3 => "Мар",
        4 => "Апр",
        5 => "Май",
        6 => "Юни",
        7 => "Юли",
        8 => "Авг",
        9 => "Сеп",
        10 => "Окт",
        11 => "Ное",
        12 => "Дек");
    return $months[$month];
}

function getshortmonthname($month)

{

$months = array(

1 => "Яну",

2 => "Фев",

3 => "Мар",

4 => "Апр",

5 => "Май",

6 => "Юни",

7 => "Юли",

8 => "Авг",

9 => "Сеп",

10 => "Окт",

11 => "Ное",

12 => "Дек");

return $months[$month];

}

usage :

echo getshortmonthname(date('n',date()));

1	echo getshortmonthname(date('n',date()));

Blog for programming languages

tip and tricks for Java, Android, Delphi, PHP and JavaScript

Author: emo

Android How To Make Text Input Dialog

Android Get WiFi Strength Percentage

Android check Wireless (WiFi) Connected

Android how to phone or tablet Vibrate programmatically

Android convert Dip to Pixels

Delphi how to store button in StringGrid

Delphi how to make license server for bussines software…

delphi start only one instance of application

Delphi check for valid entered email, works on android

PHP translate shorth month name