Các đoạn code hữu ích

public static int convertDpToPixel(int dp) {

        Resources r = Resources.getSystem();
        return Math.round(dp * (r.getDisplayMetrics().densityDpi / 160f));
    }

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public static int convertDpToPixel(int dp) {

Resources r = Resources.getSystem();

return Math.round(dp * (r.getDisplayMetrics().densityDpi / 160f));

}

Display display = ((WindowManager) getSystemService(WINDOW_SERVICE)).getDefaultDisplay(); 
int width = display.getWidth(); 
int height = display.getHeight(); 
int ori = display.getOrientation();

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Display display = ((WindowManager) getSystemService(WINDOW_SERVICE)).getDefaultDisplay();

int width = display.getWidth();

int height = display.getHeight();

int ori = display.getOrientation();

public static String convertLongToDay(long timeStamp) {
        DateFormat dateFormat = new SimpleDateFormat("dd/MM/yyyy HH:mm:ss");
        Date date = new Date(timeStamp);
        return  dateFormat.format(date);
    }

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public static String convertLongToDay(long timeStamp) {

DateFormat dateFormat = new SimpleDateFormat("dd/MM/yyyy HH:mm:ss");

Date date = new Date(timeStamp);

return dateFormat.format(date);

}

public static String getStringFromResources(Context context, int id) {
        return context.getResources().getString(id);
    }

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public static String getStringFromResources(Context context, int id) {

return context.getResources().getString(id);

}

public static  boolean isEmpty(EditText etText) {
        if (etText.getText().toString().trim().length() > 0) {
            return true;
        } else {
            etText.requestFocus();
            etText.setError("Vui lòng điền thông tin!");
            return false;
        }
    }

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public static boolean isEmpty(EditText etText) {

if (etText.getText().toString().trim().length() > 0) {

return true;

} else {

etText.requestFocus();

etText.setError("Vui lòng điền thông tin!");

return false;

}

 //Convert long to money type
    public static String formatNumber(long number) {
        if (number < 1000) {
            return String.valueOf(number);
        }
        try {
            NumberFormat formatter = new DecimalFormat("###,###");
            String resp = formatter.format(number);
            resp = resp.replaceAll(",", ".");
            return resp;
        } catch (Exception e) {
            return "";
        }
    }

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//Convert long to money type

public static String formatNumber(long number) {

if (number < 1000) {

return String.valueOf(number);

}

try {

NumberFormat formatter = new DecimalFormat("###,###");

String resp = formatter.format(number);

resp = resp.replaceAll(",", ".");

return resp;

} catch (Exception e) {

return "";

}

public static boolean isEmailValid(String email) {
        boolean isValid = false;

        String expression = "[a-zA-Z0-9._-]+@[a-z]+(\\.+[a-z]+)+";
        CharSequence inputStr = email;

        Pattern pattern = Pattern.compile(expression, Pattern.CASE_INSENSITIVE);
        Matcher matcher = pattern.matcher(inputStr);
        if (matcher.matches()) {
            isValid = true;
        }
        return isValid;
    }

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public static boolean isEmailValid(String email) {

boolean isValid = false;

String expression = "[a-zA-Z0-9._-]+@[a-z]+(\\.+[a-z]+)+";

CharSequence inputStr = email;

Pattern pattern = Pattern.compile(expression, Pattern.CASE_INSENSITIVE);

Matcher matcher = pattern.matcher(inputStr);

if (matcher.matches()) {

isValid = true;

}

return isValid;

}

public final static boolean isValidEmail(CharSequence target) {
if (TextUtils.isEmpty(target)) {
return false;
} else {
return android.util.Patterns.EMAIL_ADDRESS.matcher(target).matches();
}
}

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public final static boolean isValidEmail(CharSequence target) {

if (TextUtils.isEmpty(target)) {

return false;

} else {

return android.util.Patterns.EMAIL_ADDRESS.matcher(target).matches();

}

- From local:
MediaPlayer song = MediaPlayer.create(MainActivity.this, R.raw.nuocmat); 
song.start();

Stop: 
onPause(); 
song.pause();

- From Internet:
  public void PlayNhacMp3(String url){
        //url = "http://khoapham.vn/download/vietnamoi.mp3";
        MediaPlayer mediaPlayer = new MediaPlayer();
        mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
        try {
            mediaPlayer.setDataSource(url);
            mediaPlayer.prepareAsync();
            mediaPlayer.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {
                @Override
                public void onPrepared(MediaPlayer mp) {
                    mp.start();
                }
            });

        } catch (IOException e) {
            e.printStackTrace();
        }

    }

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- From local:

MediaPlayer song = MediaPlayer.create(MainActivity.this, R.raw.nuocmat);

song.start();

Stop:

onPause();

song.pause();

- From Internet:

public void PlayNhacMp3(String url){

//url = "http://khoapham.vn/download/vietnamoi.mp3";

MediaPlayer mediaPlayer = new MediaPlayer();

mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);

try {

mediaPlayer.setDataSource(url);

mediaPlayer.prepareAsync();

mediaPlayer.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {

@Override

public void onPrepared(MediaPlayer mp) {

mp.start();

}

});

} catch (IOException e) {

e.printStackTrace();

}

- Lưu file txt

FileOutputStream fos = openFileOutput("khoapham.txt", Context.MODE_PRIVATE); 
fos.write(noidung.getBytes());
fos.close()

- Đọc file txt

FileInputStream fis = openFileInput("khoapham.txt"); 
BufferedReader br = new BufferedReader(new InputStreamReader(new DataInputStream(fis))); 
String line = ""; 
while( (line = br.readLine()) != null ){ 
txtvNoiDung.append(line); 
txtvNoiDung.append("\n"); 
}

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- Lưu file txt

FileOutputStream fos = openFileOutput("khoapham.txt", Context.MODE_PRIVATE);

fos.write(noidung.getBytes());

fos.close()

- Đọc file txt

FileInputStream fis = openFileInput("khoapham.txt");

BufferedReader br = new BufferedReader(new InputStreamReader(new DataInputStream(fis)));

String line = "";

while( (line = br.readLine()) != null ){

txtvNoiDung.append(line);

txtvNoiDung.append("\n");

}

new CountDownTimer(30000, 1000) {

    public void onTick(long millisUntilFinished) {
        mTextField.setText("seconds remaining: " + millisUntilFinished / 1000);
       //here you can have your logic to set text to edittext
    }

    public void onFinish() {
        mTextField.setText("done!");
    }

}.start();

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new CountDownTimer(30000, 1000) {

public void onTick(long millisUntilFinished) {

mTextField.setText("seconds remaining: " + millisUntilFinished / 1000);

//here you can have your logic to set text to edittext

}

public void onFinish() {

mTextField.setText("done!");

}

}.start();

final Handler handler = new Handler();
handler.postDelayed(new Runnable() {
    @Override
    public void run() {
        // Do something after 5s = 5000ms
     
    }
}, 5000);

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final Handler handler = new Handler();

handler.postDelayed(new Runnable() {

@Override

public void run() {

// Do something after 5s = 5000ms

}

}, 5000);

private void replaceFragment(Fragment fragment) {
FragmentManager manager = getSupportFragmentManager();
FragmentTransaction transaction = manager.beginTransaction();
transaction.setCustomAnimations(R.anim.slide_in_right,R.anim.slide_out_left)
.replace(R.id.content_main, fragment)
.addToBackStack(null)
.commit();
}

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private void replaceFragment(Fragment fragment) {

FragmentManager manager = getSupportFragmentManager();

FragmentTransaction transaction = manager.beginTransaction();

transaction.setCustomAnimations(R.anim.slide_in_right,R.anim.slide_out_left)

.replace(R.id.content_main, fragment)

.addToBackStack(null)

.commit();

}

public static Typeface getTypefaceFont(Context context) {
    return Typeface.createFromAsset(context.getAssets(), "Gilroy-Light.otf");
}

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public static Typeface getTypefaceFont(Context context) {

return Typeface.createFromAsset(context.getAssets(), "Gilroy-Light.otf");

}

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