Android FM模塊學習之四源碼分析（七）

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

protectedvoid onCreate(Bundle savedInstanceState)方法裏

綁定FMRadioService服務

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

實例化ListView對象

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

上下文菜單監聽事件

?mStationList.setOnCreateContextMenuListener(this);

ListView監聽每一個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<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........");
                }
            }
        });
    }

上下文菜單

?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;
        }
    }

判斷電臺名字是否存在

privateboolean stationNameExist(String name)

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

重命名保存方法

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();
    }

刪除電臺方法

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();
    }

經過調用SharedPreferences保存名字後加載 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<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);
    }

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獲取頻率方法

privateint getFrequencyFromId(int id)

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

以Id獲取頻率名字方法

privateString getNameFromId(int id)

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

加載方法，清除ListView列表內容和索引id,從SharedPreferences裏獲取頻道個數

使用for循環將xml數據（電臺名字和頻率）添加list列表裏使用SimpleAdapter將數據顯示在UI界面裏

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服務解綁。

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