public static String getRandomString(int length) { final String s = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"; SecureRandom sr = new SecureRandom(); StringBuilder sb = new StringBuilder(length); for (int i = 0; i < length; i++) { sb.append(s.charAt(sr.nextInt(s.length()))); } return sb.toString(); }
public static void moveFile(File src, File dst) throws IOException { if (dst.exists()) { dst.delete(); } InputStream input = new FileInputStream(src); OutputStream output = new FileOutputStream(dst); byte[] buffer = new byte[1024]; int bytesRead; while ((bytesRead = input.read(buffer)) != -1) { output.write(buffer, 0, bytesRead); } src.delete(); }
public static void copyInputStreamToFile(InputStream src, File dst) throws IOException { OutputStream output = new FileOutputStream(dst); byte[] buffer = new byte[1024]; int bytesRead; while ((bytesRead = src.read(buffer)) != -1) { output.write(buffer, 0, bytesRead); } }
@NonNull public static String readTextFileFromAsset(Context c, String path) { StringBuilder s = new StringBuilder(); InputStream fIn = null; InputStreamReader isr = null; BufferedReader input = null; try { fIn = c.getResources().getAssets().open(path); isr = new InputStreamReader(fIn); input = new BufferedReader(isr); String line; while ((line = input.readLine()) != null) { s.append(line); } } catch (Exception e) { e.getMessage(); } finally { try { if (isr != null) isr.close(); if (fIn != null) fIn.close(); if (input != null) input.close(); } catch (Exception e2) { e2.getMessage(); } } return s.toString(); }
public static void openDialer(Context c, String number) { Intent i = new Intent(Intent.ACTION_DIAL); i.setData(Uri.parse("tel:" + number)); c.startActivity(i); }
public static void copyFile(File src, File dst) throws IOException { InputStream input = new FileInputStream(src); OutputStream output = new FileOutputStream(dst); byte[] buffer = new byte[1024]; int bytesRead; while ((bytesRead = input.read(buffer)) != -1) { output.write(buffer, 0, bytesRead); } }
public static float pixelTodp(Context c, float pixel) { float density = c.getResources().getDisplayMetrics().density; float dp = pixel / density; return dp; }
public static float dpTopixel(Context c, float dp) { float density = c.getResources().getDisplayMetrics().density; float pixel = dp * density; return pixel; }
public static Bitmap rotateBitmap(Bitmap src, float rotationDegree) { Matrix matrix = new Matrix(); matrix.setRotate(rotationDegree); return Bitmap.createBitmap(src, 0, 0, src.getWidth(), src.getHeight(), matrix, true); }
public static Bitmap flipBitmap(Bitmap src, int type/*0=horizontal, 1=vertical*/) { Matrix matrix = new Matrix(); if(type == 0) { matrix.preScale(-1.0f, 1.0f); } else if(type == 1) { matrix.preScale(1.0f, -1.0f); } else { return null; } return Bitmap.createBitmap(src, 0, 0, src.getWidth(), src.getHeight(), matrix, true); }
public static boolean isValidEmail(CharSequence target) { if (TextUtils.isEmpty(target)) { return false; } else { return android.util.Patterns.EMAIL_ADDRESS.matcher(target).matches(); } }
public static boolean isNetworkAvailable(Context c) { ConnectivityManager connectivityManager = (ConnectivityManager) c.getSystemService(Context.CONNECTIVITY_SERVICE); NetworkInfo activeNetworkInfo = connectivityManager.getActiveNetworkInfo(); return activeNetworkInfo != null && activeNetworkInfo.isConnected(); }