Android FM模組學習之四源碼分析（七）

Android FM模組學習之四源碼分析（七）

 現在分析androidendorqcomopensourcemmapp2srccomcafmradioStationListActivity.java

 

protectedvoid onCreate(Bundle savedInstanceState)方法裡

綁定FMRadioService服務

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

執行個體化ListView對象

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

操作功能表監聽事件

mStationList.setOnCreateContextMenuListener(this);

ListView監聽每個Item事件

mStationList.setOnItemClickListener(newOnItemClickListener()

調用mService.tune((int)((fFreq * 1000)));方法調頻

 

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) 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........);                }            }        });    }

 

操作功能表

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

添加從命名和刪除功能

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

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

標題

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

 

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));    }

 

 

 

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;        }    }

 

判斷電台名字是否存在

privateboolean stationNameExist(String name)

 

private boolean stationNameExist(String name) {        for (HashMap item : list) {            if (item != null && name.equals(item.get(name))) {                return true;            }        }        return false;    }

 

重新命名儲存方法

saveStationName(mItemId,rename);

mRenameDialog.dismiss();

 

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();    }

 

 

刪除電台方法

deleteStation(mItemId);

mDeleteDialog.dismiss()；

 

 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();    }

 

 

通過調用SharedPreferences儲存名字後載入 load();

 

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 item = new HashMap();            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);    }

 

方法

privatevoid saveStationName(int id, String name)

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

 

privatevoid deleteStation(int id) 刪除方法，刪除名字和頻率

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

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

 

以id擷取頻率方法

privateint getFrequencyFromId(int id)

 

private int getFrequencyFromId(int id) {        String freq = ((HashMap) mAdapter.getItem(id))                .get(freq);        Float fFreq = Float.parseFloat(freq);        return (int) ((fFreq * 1000));    }

 

以Id擷取頻率名字方法

privateString getNameFromId(int id)

 

 private String getNameFromId(int id) {        String name = ((HashMap) mAdapter.getItem(id))                .get(name);        return name;    }

 

載入方法，清除ListView列表內容和索引id,從SharedPreferences裡擷取頻道個數

使用for迴圈將xml資料（電台名字和頻率）添加list列表裡使用SimpleAdapter將資料顯示在UI介面裡

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類的onDestroy() 方法對FMRadioService服務解除綁定。

unbindService(osc);

protected void onDestroy() {        unbindService(osc);        mService = null;        super.onDestroy();    }