AndroidFM模組學習之四源碼分析（九）

AndroidFM模組學習之四源碼分析（九）

接下來我們看看android\vendor\qcom\opensource\fm\fmapp2\src\com\caf\fmradio\PresetList.java

 

定義一個List列表List

mPresetList = new ArrayList
();
同步電台數量
 
public synchronized int getStationCount(){        return mPresetList.size();    }
 
獲得電台名字
 
 public synchronized String getStationName(int stationNum){        String name = "";        if (mPresetList.size() > stationNum){            name = mPresetList.get(stationNum).getName();        }        return name;    }

 
擷取電台頻率
 
public synchronized int getStationFrequency(int stationNum){        int frequency = 102100;        if (mPresetList.size() > stationNum){            frequency = mPresetList.get(stationNum).getFrequency();        }        return frequency;    }

 
 
設定電台頻率
 
public synchronized void setStationFrequency(int stationNum, int frequency){        PresetStation mStation = mPresetList.get(stationNum);        mStation.setFrequency(frequency);    }
設定電台名字
 
public synchronized void setStationName(int stationNum, String name){        PresetStation mStation = mPresetList.get(stationNum);        mStation.setName(name);    }

 
 
通過ID得到電台
 
public synchronized PresetStation getStationFromIndex(int index){        int totalPresets = mPresetList.size();        PresetStation station = null;        if (index < totalPresets) {            station = mPresetList.get(index);        }        return station;    }

 
 
通過頻率得到電台
 
public synchronized PresetStation getStationFromFrequency(int frequency){        int totalPresets = mPresetList.size();        for (int presetNum = 0; presetNum < totalPresets; presetNum++ ) {            PresetStation station = mPresetList.get(presetNum);            if (station != null) {                if(frequency == station.getFrequency()) {                    return station;                }            }        }        return null;    }

 
添加電台名字和頻率
 
public synchronized PresetStation addStation(String name, int freq){        PresetStation addStation = new PresetStation(name, freq);        if(addStation != null) {            mPresetList.add(addStation);        }        return addStation;    }

 
添加電台
 
public synchronized PresetStation addStation(PresetStation station){        PresetStation addStation = null;        if(station != null) {            addStation = new PresetStation (station);            mPresetList.add(addStation);        }        return addStation;    }

 
 
刪除電台
 
 public synchronized void removeStation(int index){       int totalPresets = mPresetList.size();       if((index >= 0) && (index < totalPresets))       {          mPresetList.remove(index);       }    }

 
 
清除調頻列表
 
public synchronized void clear(){        mPresetList.clear();    }

 
 
/ *如果使用者選擇一個新電台在這個列表中,將調用這個函數來更新列表。
* /
 
public synchronized boolean setSelectedStation(PresetStation selectStation){        int totalPresets = mPresetList.size();        if (selectStation != null) {            for (int presetNum = 0; presetNum < totalPresets; presetNum++ ) {                PresetStation station = mPresetList.get(presetNum);                if (station != null) {                    if(selectStation.getFrequency() == station.getFrequency()) {                        if(selectStation.getName().equalsIgnoreCase(station.getName())) {                            mCurrentStation = presetNum;                            return true;                        }                    }                }            }        }        return false;    }

 
 
/ *檢查是否有相同電台存在在列表中
* /
 
public synchronized boolean sameStationExists(PresetStation compareStation){        int totalPresets = mPresetList.size();        if (compareStation != null) {            for (int presetNum = 0; presetNum < totalPresets; presetNum++ ) {                PresetStation station = mPresetList.get(presetNum);                if (station != null) {                    if(compareStation.getFrequency() == station.getFrequency()) {                        return true;                    }                }            }        }        return false;    }

 
 
/ *如果使用者在這個列表中選擇一個新電台,將調用這個常式
*更新列表。
* /
 
public synchronized boolean setSelectedStation(int stationIndex){        boolean foundStation = false;        int totalPresets = mPresetList.size();        if (stationIndex < totalPresets) {            mCurrentStation = stationIndex;            foundStation = true;        }        return foundStation;    }

 
 
選擇電台
 
public synchronized void selectStation(PresetStation selectStation){ int totalPresets = mPresetList.size(); if (selectStation != null) { for (int presetNum = 0; presetNum < totalPresets; presetNum++ ) { PresetStation station = mPresetList.get(presetNum); if (station != null) { if(selectStation.getFrequency() == station.getFrequency()) { mCurrentStation = presetNum; return; } } } } }

 

 
 
擷取選擇的站
 
public synchronized PresetStation getSelectedStation(){        int totalPresets = mPresetList.size();        PresetStation station = null;        if (mCurrentStation < totalPresets) {            station = mPresetList.get(mCurrentStation);        }        return station;    }

 
 
選擇下一個電台
 
public synchronized PresetStation selectNextStation(){        int totalPresets = mPresetList.size();        PresetStation station = null;        if(totalPresets > 0) {            mCurrentStation ++;            if ( (mCurrentStation) >= totalPresets) {                mCurrentStation =0;            }            station = mPresetList.get(mCurrentStation);        }        return station;    }


 
選擇上一個電台
 public synchronized PresetStation selectPrevStation(){        int totalPresets = mPresetList.size();        PresetStation station = null;        if(totalPresets > 0) {            mCurrentStation --;            if ( mCurrentStation < 0) {                mCurrentStation = totalPresets-1;            }            station = mPresetList.get(mCurrentStation);        }        return station;    }