AndroidFM模塊學習之四源碼分析（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ListmPresetList = 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;
    }

 

獲取電台頻率

 

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

 

 

設置電台頻率

 

public synchronized void setStationFrequency(int stationNum, int frequency){
        PresetStation mStation = mPresetList.get(stationNum);
        mStation.setFrequency(frequency);
    }

設置電台名字

 

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();
    }

 

 

/ *如果用戶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;
    }

 

 

/ *如果用戶在這個列表中選擇一個新電台,將調用這個例程

*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; } } } } }

 

 

 

獲取選擇的站

 

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;
    }