Android FM模块学习之四源码分析（七）

接上一篇，现在分析android\vendor\qcom\opensource\fm\fmapp2\src\com\caf\fmradio\StationListActivity.java

protectedvoid onCreate(Bundle savedInstanceState)方法里

绑定FMRadioService服务

bindService((newIntent()).setClass(this, FMRadioService.class), osc, 0);

实例化ListView对象

mStationList= (ListView) findViewById(R.id.station_list);

上下文菜单监听事件

 mStationList.setOnCreateContextMenuListener(this);

ListView监听每个Item事件

mStationList.setOnItemClickListener(newOnItemClickListener()

调用mService.tune((int)((fFreq * 1000)));方法调频

 

<span style="font-family:KaiTi_GB2312;font-size:18px;">protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.station_list);        bindService((new Intent()).setClass(this, FMRadioService.class), osc, 0);        mStationList = (ListView) findViewById(R.id.station_list);        // mPresetList = new PresetList("StationList");        mStationList.setOnCreateContextMenuListener(this);        mStationList.setOnItemClickListener(new OnItemClickListener() {            @Override            public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,                    long arg3) {                String freq = ((HashMap<String, String>) mAdapter.getItem(arg2))                        .get("freq");                Float fFreq = Float.parseFloat(freq);                if (mService != null) {                    try {mService.tune((int) ((fFreq * 1000)));                        finish();                    } catch (RemoteException e) {                        e.printStackTrace();                    }                } else {                    Log.d(LOGTAG, "mService is null........");                }            }        });    }</span>

上下文菜单

 public void onCreateContextMenu(ContextMenumenu, View v,ContextMenuInfo menuInfo)

添加从命名和删除功能

menu.add(0,CONTEXT_MENU_RENAME, 0, getString(R.string.preset_rename));

menu.add(0,CONTEXT_MENU_DELETE, 0, getString(R.string.preset_delete));

标题

menu.setHeaderTitle(getString(R.string.station_name)+getNameFromId(mItemId));

 

<span style="font-family:KaiTi_GB2312;font-size:18px;">public void onCreateContextMenu(ContextMenu menu, View v,            ContextMenuInfo menuInfo) {        // TODO Auto-generated method stub        AdapterContextMenuInfo mi = (AdapterContextMenuInfo) menuInfo;        menu.add(0, CONTEXT_MENU_RENAME, 0, getString(R.string.preset_rename));        menu.add(0, CONTEXT_MENU_DELETE, 0, getString(R.string.preset_delete));        mItemId = mi.position;        menu.setHeaderTitle(getString(R.string.station_name)+getNameFromId(mItemId));    }</span>

<span style="font-family:KaiTi_GB2312;font-size:18px;">protected void onPrepareDialog(int id, Dialog dialog, Bundle b) {        // TODO Auto-generated method stub        // super.onPrepareDialog(id, dialog);        // After change system language, current function will be executed before        // onResume , so execute load to ensure adapter is not null.        load();        switch (id) {        case DIALOG_RENAME_ID:            mRenameDialog.setTitle(getString(R.string.station_name)+getNameFromId(mItemId));            final EditText editText = (EditText) mRenameDialog                    .findViewById(R.id.name);            editText.setText(getNameFromId(mItemId));            Button bOk = (Button) mRenameDialog.findViewById(R.id.save);            bOk.setOnClickListener(new View.OnClickListener() {@Override                public void onClick(View v) {                    String rename = editText.getText().toString();                    if (TextUtils.isEmpty(rename) || TextUtils.isEmpty(rename.trim())) {                        Context context = getApplicationContext();                        Toast toast = Toast.makeText(context, getString(R.string.station_name_empty),                                Toast.LENGTH_SHORT);                        toast.setGravity(Gravity.CENTER_HORIZONTAL | Gravity.CENTER_VERTICAL, 0, 0);                        toast.show();                    } else if (stationNameExist(rename)) {                        Context context = getApplicationContext();                        Toast toast = Toast.makeText(context,                                getString(R.string.station_name_exist, rename), Toast.LENGTH_SHORT);                        toast.setGravity(Gravity.CENTER_HORIZONTAL | Gravity.CENTER_VERTICAL, 0, 0);                        toast.show();                    } else {                        saveStationName(mItemId,rename);                        mRenameDialog.dismiss();                    }                }            });Button bCancel = (Button) mRenameDialog.findViewById(R.id.cancel);            bCancel.setOnClickListener(new View.OnClickListener() {                @Override                public void onClick(View v) {                    // TODO Auto-generated method stub                    mRenameDialog.dismiss();                }            });            break;        case DIALOG_DELETE_ID:            mDeleteDialog.setTitle(getString(R.string.station_list_delete_station, getNameFromId(mItemId)));            TextView prompt = (TextView) mDeleteDialog.findViewById(R.id.prompt);            prompt.setText(getString(R.string.station_list_delete_station_prompt,getNameFromId(mItemId)));            Button bDelete = (Button) mDeleteDialog.findViewById(R.id.delete);            bDelete.setOnClickListener(new View.OnClickListener() {@Override                public void onClick(View v) {                    deleteStation(mItemId);                    mDeleteDialog.dismiss();                }            });            Button bCancelDelete = (Button) mDeleteDialog.findViewById(R.id.cancel);            bCancelDelete.setOnClickListener(new View.OnClickListener() {                @Override                public void onClick(View v) {                    mDeleteDialog.dismiss();                }            });            break;        }    }</span>

判断电台名字是否存在

privateboolean stationNameExist(String name)

 

<span style="font-family:KaiTi_GB2312;font-size:18px;">private boolean stationNameExist(String name) {        for (HashMap<String, String> item : list) {            if (item != null && name.equals(item.get("name"))) {                return true;            }        }        return false;    }</span>

重命名保存方法

saveStationName(mItemId,rename);

mRenameDialog.dismiss();

<span style="font-family:KaiTi_GB2312;font-size:18px;">private void saveStationName(int id, String name) {        Integer stationIndex = mIndex.get(new Integer(id));        SharedPreferences sp = getSharedPreferences(                FMRadio.SCAN_STATION_PREFS_NAME, 0);        SharedPreferences.Editor editor = sp.edit();        editor .putString(FMRadio.STATION_NAME + (stationIndex.intValue()), name);        editor.commit();        load();    }</span>

 

删除电台方法

 deleteStation(mItemId);

 mDeleteDialog.dismiss()；

 

<span style="font-family:KaiTi_GB2312;font-size:18px;"> private void deleteStation(int id) {        SharedPreferences sp = getSharedPreferences( FMRadio.SCAN_STATION_PREFS_NAME, 0);        Integer stationIndex = mIndex.get(new Integer(id));        SharedPreferences.Editor editor = sp.edit();        editor.remove(FMRadio.STATION_NAME + (stationIndex));        editor.remove(FMRadio.STATION_FREQUENCY + (stationIndex));        editor.commit();        load();    }</span>

 

通过调用SharedPreferences保存名字后加载 load();

<span style="font-family:KaiTi_GB2312;font-size:18px;">protected void load() {        list.clear();        mIndex.clear();        SharedPreferences sp = getSharedPreferences(FMRadio.SCAN_STATION_PREFS_NAME, 0);        int station_number = sp.getInt(FMRadio.NUM_OF_STATIONS, 0);        for (int i = 1; i <= station_number; i++) {            HashMap<String, String> item = new HashMap<String, String>();            String name = sp.getString(FMRadio.STATION_NAME + i, "");            int frequency = sp.getInt(FMRadio.STATION_FREQUENCY + i, 0);            if (!name.equals("") && frequency != 0) {                item.put("name", name); item.put("freq", String.valueOf(frequency / 1000.0f));                mIndex.put(new Integer(list.size()), new Integer(i));                list.add(item);            }        }        mAdapter = new SimpleAdapter(this, list, R.layout.station_list_item,                new String[] { "name", "freq" }, new int[] { R.id.name,                        R.id.freq });        mStationList.setAdapter(mAdapter);    }</span>

方法

privatevoid saveStationName(int id, String name)

editor.putString(FMRadio.STATION_NAME+ (stationIndex.intValue()),

 

privatevoid deleteStation(int id) 删除方法，删除名字和频率

 editor.remove(FMRadio.STATION_NAME +(stationIndex));

 editor.remove(FMRadio.STATION_FREQUENCY +(stationIndex));

 

以id获取频率方法

privateint getFrequencyFromId(int id)

 

<span style="font-family:KaiTi_GB2312;font-size:18px;">private int getFrequencyFromId(int id) {        String freq = ((HashMap<String, String>) mAdapter.getItem(id))                .get("freq");        Float fFreq = Float.parseFloat(freq);        return (int) ((fFreq * 1000));    }</span>

以Id获取频率名字方法

privateString getNameFromId(int id)

 

<span style="font-family:KaiTi_GB2312;font-size:18px;"> private String getNameFromId(int id) {        String name = ((HashMap<String, String>) mAdapter.getItem(id))                .get("name");        return name;    }</span>

加载方法，清除ListView列表内容和索引id,从SharedPreferences里获取频道个数

使用for循环将xml数据（电台名字和频率）添加list列表里使用SimpleAdapter将数据显示在UI界面里

protected void load() {

               item.put("name", name);

                item.put("freq",String.valueOf(frequency / 1000.0f));

                mIndex.put(newInteger(list.size()), new Integer(i));

                list.add(item);

}

 

mAdapter= new SimpleAdapter(this, list, R.layout.station_list_item,

                new String[] {"name", "freq" }, new int[] { R.id.name,

                        R.id.freq });

 

在StationListActivity类的onDestroy() 方法对FMRadioService服务解绑。

unbindService(osc);

<span style="font-family:KaiTi_GB2312;font-size:18px;">protected void onDestroy() {        unbindService(osc);        mService = null;        super.onDestroy();    }</span>