接上一篇，接下来看看android\vendor\qcom\opensource\fm\fmapp2\src\com\caf\fmradio\FmTags.java
当点击FMRadio.java菜单的全部频道选项，跳转到FmTags.java类
定义了一个ListView控件和一个简单适配器
private ListView la;
private ArrayAdapter<String> adapter;
使用Handler刷新UI界面
private final Handler mHandler = newHandler();
使用迭代器private Iterator itr;
将FmSharedPreferences类取出数据迭代化，再使用循环添加到字符数组里，使用适配器显示。
final Runnable mDisplayTagList = new Runnable() { public void run() { String[] tags; int l = 0; tags = new String[FmSharedPreferences.num_tags]; for(int i = 0; i < FmSharedPreferences.MAX_NUM_TAG_TYPES; i++) { if (FmSharedPreferences.tagList[i] != null) { itr = FmSharedPreferences.tagList[i].iterator(); while(itr.hasNext()) tags[l++] = ((FmSharedPreferences.TAG_NAMES[i]) + "\n" + "\t" + (String)itr.next()); } } adapter = new ArrayAdapter(la.getContext(), android.R.layout.simple_list_item_1, tags); la.setAdapter(adapter); } };再分析一个FM耳机按键的类 android\vendor\qcom\opensource\fm\fmapp2\src\com\caf\fmradio\FMMediaButtonIntentReceiver.java手机耳机控制音量或者其它，通过静态注册接收action（“android.intent.action.MEDIA_BUTTON”）
按键监听事件
KeyEvent event =(KeyEvent)intent.getParcelableExtra(Intent.EXTRA_KEY_EVENT);
监听是否是头戴式耳机和点击按下去的监听
intkeycode = event.getKeyCode();
intkey_action = event.getAction();
发送一个附带Intent.EXTRA_KEY_EVENT广播去FMRadioService实现接听实现一些功能。
KeyEvent.KEYCODE_HEADSETHOOK:监听是否是头戴式耳机
KeyEvent.ACTION_DOWN:监听是否按下键
KeyEvent.KEYCODE_MEDIA_PLAY_PAUSE:暂停
KeyEvent.KEYCODE_MEDIA_PLAY 播放键
KeyEvent.KEYCODE_MEDIA_NEXT:短按=播放下一首音乐，长按=当前音乐快进
KeyEvent.KEYCODE_MEDIA_PREVIOUS:短按=播放上一首音乐，长按=当前音乐快退
欧标耳机才能测试出监听事件
public class FMMediaButtonIntentReceiver extends BroadcastReceiver {private static final String TAG = "FMMediaButtonIntentReceiver";public static final String FM_MEDIA_BUTTON = "com.caf.fmradio.action.MEDIA_BUTTON";public static final String AUDIO_BECOMING_NOISY = "com.caf.fmradio.action.AUDIO_BECOMING_NOISY";public void onReceive(Context context, Intent intent) { String action = intent.getAction(); if ((action != null) && action.equals(AudioManager.ACTION_AUDIO_BECOMING_NOISY)) { Log.d(TAG, "ACTION_AUDIO_BECOMING_NOISY intent received for ACTION_HEADSET_PLUG"); Intent i = new Intent(AUDIO_BECOMING_NOISY); context.sendBroadcast(i); } else if ((action != null) && action.equals("android.intent.action.MEDIA_BUTTON")) { KeyEvent event = (KeyEvent) intent.getParcelableExtra(Intent.EXTRA_KEY_EVENT); if (event == null) { return; } int keycode = event.getKeyCode(); int key_action = event.getAction(); if (((KeyEvent.KEYCODE_HEADSETHOOK == keycode) && (key_action == KeyEvent.ACTION_DOWN)) || (KeyEvent.KEYCODE_MEDIA_PAUSE == keycode) || (KeyEvent.KEYCODE_MEDIA_PLAY == keycode)) { Log.d(TAG, "ACTION_MEDIA_BUTTON intent received for ACTION_DOWN"); Intent i = new Intent(FM_MEDIA_BUTTON); i.putExtra(Intent.EXTRA_KEY_EVENT, event); context.sendBroadcast(i); } } }