Check external storage available in device,readable and writeable in android

1.It returns true if the external storage is available else false otherwise.

/**
     * Check if external storage available
     * @return
     */
   
    public static boolean isExternalStorageAvailable() {
          String extStorageState = Environment.getExternalStorageState();
          if (Environment.MEDIA_MOUNTED.equals(extStorageState)) {
           return true;
          }
          return false;
         }   







2.It returns true if the external storage is read only else false otherwise




/**
     * Check if external storage is read only
     * @return
     */
    public static boolean isExternalStorageReadOnly() {
          String extStorageState = Environment.getExternalStorageState();
          if (Environment.MEDIA_MOUNTED_READ_ONLY.equals(extStorageState)) {
           return true;
          }
          return false;
         }  




3.It returns true if the external storage is writable else false otherwise




/**
       * @return True if the external storage is writable.
       * False otherwise.
       */
      public static boolean isExternalStoragewriteonly() {
        String state = Environment.getExternalStorageState();
        // Check if writable
        if (Environment.MEDIA_MOUNTED.equals(state)) {
          return true;
        }
        return false;
       
      }