Android FM模块学习之四源码解析（四）

我今天想分享的是FM模块的保存方法，即FmSharedPreferences.java

FmSharedPreferences(Context context)在构造方法中加载Load()方法，

public void  Load(){
      Log.d(LOGTAG, "Load preferences ");
      if(mContext == null)
      {
         return;
      }
      SharedPreferences sp = mContext.getSharedPreferences(SHARED_PREFS, Context.MODE_PRIVATE);
      mTunedFrequency = sp.getInt(PREF_LAST_TUNED_FREQUENCY, DEFAULT_NO_FREQUENCY);
      mRecordDuration = sp.getInt(LAST_RECORD_DURATION, RECORD_DUR_INDEX_0_VAL);
      mAFAutoSwitch = sp.getBoolean(LAST_AF_JUMP_VALUE, true);
      mAudioOutputMode = sp.getBoolean(AUDIO_OUTPUT_MODE, true);
      if(sp.getInt(FMCONFIG_COUNTRY, 0) == REGIONAL_BAND_USER_DEFINED) {
         mBandMinFreq = sp.getInt(FMCONFIG_MIN, mBandMinFreq);
         mBandMaxFreq = sp.getInt(FMCONFIG_MAX, mBandMaxFreq);
         mChanSpacing = sp.getInt(FMCONFIG_STEP, mChanSpacing);
      }

      int num_lists = sp.getInt(LIST_NUM, 1);
      if (mListOfPlists.size() == 0) {
      for (int listIter = 0; listIter < num_lists; listIter++) {
             String listName = sp.getString(LIST_NAME + listIter, "FM - " + (listIter+1));
             int numStations = sp.getInt(STATION_NUM + listIter, 1);
             if (listIter == 0) {
                 createFirstPresetList(listName);
             } else {
                 createPresetList(listName);
             }
             PresetList curList = mListOfPlists.get(listIter);
             for (int stationIter = 0; stationIter < numStations; stationIter++) {
                  String stationName = sp.getString(STATION_NAME + listIter + "x" + stationIter,
                                                      DEFAULT_NO_NAME);
                  int stationFreq = sp.getInt(STATION_FREQUENCY + listIter + "x" + stationIter,
                                                   DEFAULT_NO_FREQUENCY);
                  PresetStation station = curList.addStation(stationName, stationFreq);

                  int stationId = sp.getInt(STATION_ID + listIter + "x" + stationIter,
                                              DEFAULT_NO_STATIONID);
                  station.setPI(stationId);

                  int pty = sp.getInt(STATION_PTY + listIter + "x" + stationIter, DEFAULT_NO_PTY);
                  station.setPty(pty);

                  int rdsSupported = sp.getInt(STATION_RDS + listIter + "x" + stationIter,
                                                 DEFAULT_NO_RDSSUP);
                  if (rdsSupported != 0) {
                      station.setRDSSupported(true);
                  } else {
                      station.setRDSSupported(false);
                  }
      /* Load Configuration */
      	setCountry(sp.getInt(FMCONFIG_COUNTRY, REGIONAL_BAND_NORTH_AMERICA));
      /* Last list the user was navigating */
      mListIndex = sp.getInt(LAST_LIST_INDEX, 0);
      if(mListIndex >= num_lists)
      {mListIndex=0;
      }
   }

初始化取出sp一些数据

根据系统初始化地区设置当地频率

/*Load Configuration */

     if (Locale.getDefault().equals(Locale.CHINA)) {

         setCountry(sp.getInt(FMCONFIG_COUNTRY, REGIONAL_BAND_CHINA));

     } else {

         setCountry(sp.getInt(FMCONFIG_COUNTRY, REGIONAL_BAND_NORTH_AMERICA));

     }

     /* Last list the user was navigating */

保存频率

public void Save()

设置默认的地区

public static void SetDefaults()

设置调整频率

public static void setTunedFrequency(intfrequency)

获取调整频率

public static int getTunedFrequency()

获取下一个频率

public static int getNextTuneFrequency(intfrequency)

获取上一个频率

public static int getPrevTuneFrequency(intfrequency)

/ * *

* @param mFMConfiguration mFMConfiguration设置

* /

public static void setFMConfiguration(FmConfig mFMConfig)

/**

    *@return the mFMConfiguration

   */

  public static FmConfig getFMConfiguration() {

     return mFMConfiguration;

   }

设置fm播放的频率范围

public static void setRadioBand(int band)

获取fm频率范围限制

public static int getRadioBand()

获取间隔

public static int getChSpacing()

设置远程数据服务

public static void setRdsStd(int std)

mFMConfiguration.setRdsStd(std);

获取远程数据服务

public static int getRdsStd()

mFMConfiguration.getRdsStd();

设置国家地区

public static void setCountry(intnCountryCode)

获取国家地区

public static int getCountry()

设置声音输出模板

setAudioOutputMode

设置录音是否持续

public static void setRecordDuration(intdurationIndex)