Android FM模塊學習之四源碼分析（八）

接上一篇 ，今天將要來看看android\vendor\qcom\opensource\fm\fmapp2\src\com\caf\fmradio \PresetStation.java

調整頻率位置狀態構造方法

public PresetStation(String name, int frequency) {
           mName = name;
      /*
       *  setFrequency set the name to
       *  "Frequency" String if Name is empty
       */
      setFrequency(frequency);
   }

設置頻率

 public void setFrequency(int freq){
      mFrequency = freq;
      /* If no name set it to the frequency */
      if (TextUtils.isEmpty(mName))
      {
         mName = ""+mFrequency/1000.0;
      }
      return;
   }

?

構造方法

public PresetStation(PresetStation station) {
      Copy(station);
      /*
       *  setFrequency set the name to
       *  "Frequency" String if Name is empty
       */
      setFrequency(station.getFrequency());
   }

?

複製頻率位置

?

public void Copy(PresetStation station) {
      /* Let copy just do a copy
       * without any manipulation
       */
      mName = station.getName();
      mFrequency = station.getFrequency();
      mPI = station.getPI();
      mPty = station.getPty();
      mRDSSupported = station.getRDSSupported();
 
      mPtyStr = station.getPtyString();
      mPIStr = station.getPIString();
   }

獲取 public static String getFrequencyString(int frequency)字符串

?

  public static String getFrequencyString(int frequency) {
          double frequencyDbl = frequency / 1000.0;
      String frequencyString =""+frequencyDbl;
      return frequencyString;
   }

常規解析PI代碼從整數到呼號字符串

public static String parsePI(int piCode)
   {
      String callSign = "";
      if ( (piCode >> 8) == 0xAF)
      {//CALL LETTERS THAT MAP TO PI CODES = _ _ 0 0.
         piCode = ((piCode & 0xFF) << 8);
      }
      /* Run the second exception
         NOTE: For 9 special cases 1000,2000,..,9000 a double mapping
         occurs utilizing exceptions 1 and 2:
         1000->A100->AFA1;2000->A200->AFA2; ... ;
         8000->A800->AFA8;9000->A900->AFA9
      */
      if ( (piCode >> 12) == 0xA)
      {//CALL LETTERS THAT MAP TO PI CODES = _ 0 _ _.
         piCode = ((piCode & 0xF00) << 4) + (piCode & 0xFF);
      }
      if ( (piCode >= 0x1000) && (piCode <= 0x994E))
      { String ShartChar;
         /* KAAA - KZZZ */
         if ( (piCode >= 0x1000) && (piCode <= 0x54A7))
         {
            piCode -= 0x1000;
            ShartChar = "K";
         } else
         { /* WAAA - WZZZ*/
            piCode -= 0x54A8;
            ShartChar = "W";
         }
         int CharDiv = piCode / 26;
         int CharPos = piCode - (CharDiv * 26);
         char c3 = (char)('A'+CharPos);
 
         piCode = CharDiv;CharDiv = piCode / 26;
         CharPos = piCode - (CharDiv * 26);
         char c2 = (char)('A'+CharPos);
 
         piCode = CharDiv;
         CharDiv = piCode / 26;
         CharPos = piCode - (CharDiv * 26);
         char c1 = (char)('A'+CharPos);
         callSign = ShartChar + c1+ c2+ c3;
      } else if ( (piCode >= 0x9950) && (piCode <= 0x9EFF))
      {//3-LETTER-ONLY CALL LETTERS
         callSign = get3LetterCallSign(piCode);} else
      {//NATIONALLY-LINKED RADIO STATIONS CARRYING DIFFERENT CALL LETTERS
         callSign = getOtherCallSign(piCode);
      }
      return callSign;
   }

?

得到項目類型的文本字符串的代碼

public static String getRDSPtyString(int pty)

public static String parsePTY(int pty)    {       String ptyStr="";       int rdsStd = FmSharedPreferences.getFMConfiguration().getRdsStd();       if(rdsStd ==  FmReceiver.FM_RDS_STD_RBDS)       {          ptyStr = getRBDSPtyString(pty);       }       else if(rdsStd ==  FmReceiver.FM_RDS_STD_RDS)       {          ptyStr = getRDSPtyString(pty);       }       return (ptyStr);