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)