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>