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来电铃声的设置、手机闹钟、手势识别来电铃声的设置
MediaStore简介
MediaStore是android系统提供的一个多媒体数据库，android中多媒体信息都可以从这里提取。MediaStore包括了多媒体数据库的所有信息，包括音频，视频和图像，android把所有的多媒体数据库接口进行了封装，所有的数据库不用自己进行创建，直接使用ContentResolver调用那些封装好的接口就可以进行数据库的操作了
得到sdcard里面所有的歌曲，使用了异步查询，注册绑定上下文菜单，从MediaStore得到选中信息
//设置铃声需要权限（setting）RingtoneManager.setActualDefaultRingtoneUri(this,RingtoneManager.TYPE_RINGTONE,uri);public class MainActivity extends Activity{private static final int MENU_ID_SET_RINGTONE = 0;privateListView lv;private QueryHandler queryHandler;private String[] projection = new String[]{Media._ID,Media.DISPLAY_NAME};privateMyAdapter adatper;/**Called when the activity is first created. */@Overridepublic void onCreate(BundlesavedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.main);lv = (ListView) findViewById(R.id.lv);adatper = new MyAdapter(this, null);lv.setAdapter(adatper);queryHandler = new QueryHandler(getContentResolver());startQuery();registerForContextMenu(lv);}@Overridepublic void onCreateContextMenu(ContextMenu menu, View v,ContextMenuInfomenuInfo) {// TODO Auto-generated method stubsuper.onCreateContextMenu(menu, v,menuInfo);menu.add(0, MENU_ID_SET_RINGTONE, 0,"设置为手机铃声");}@Overridepublic boolean onContextItemSelected(MenuItem item) {// TODO Auto-generated method stub//得到要设置手机铃声是那首歌（确定uri）//设置为铃声AdapterContextMenuInfo acmi =(AdapterContextMenuInfo) item.getMenuInfo();int position = acmi.position;Cursor c = (Cursor) adatper.getItem(position);String id = c.getString(0);Uri uri =Uri.withAppendedPath(Media.EXTERNAL_CONTENT_URI, id);//设置铃声需要权限（setting）RingtoneManager.setActualDefaultRingtoneUri(this,RingtoneManager.TYPE_RINGTONE,uri);return super.onContextItemSelected(item);}private void startQuery(){queryHandler.startQuery(0,null,Media.EXTERNAL_CONTENT_URI,projection,null, null, null);}private class QueryHandler extends AsyncQueryHandler{public QueryHandler(ContentResolver cr) {super(cr);//TODO Auto-generated constructor stub}@Overrideprotected void onQueryComplete(int token,Object cookie, Cursor cursor) {//TODO Auto-generated method stubsuper.onQueryComplete(token,cookie, cursor);adatper.changeCursor(cursor);}}private class MyAdapter extends CursorAdapter{public MyAdapter(Context context, Cursorc) {super(context,c);//TODO Auto-generated constructor stub}@Overridepublic View newView(Context context,Cursor cursor, ViewGroup parent) {//TODO Auto-generated method stubViewview = getLayoutInflater().inflate(R.layout.item, null);ViewHolderholder = new ViewHolder();holder.tv_name= (TextView) view.findViewById(R.id.tv_name);view.setTag(holder);returnview;}@Overridepublic void bindView(View view, Contextcontext, Cursor cursor) {//TODO Auto-generated method stubViewHolderholder = (ViewHolder) view.getTag();Stringname = cursor.getString(1);holder.tv_name.setText(name);}}private class ViewHolder{TextView tv_name;}@Overrideprotected void onDestroy() {// TODO Auto-generated method stubsuper.onDestroy();Cursor cursor = adatper.getCursor();if(cursor != null &&!cursor.isClosed()){cursor.close();}}}
闹钟
AlarmManager简介
AlarmManager的使用机制有的称呼为全局定时器，有的称呼为闹钟，它的作用和Timer有点相似，有两种用法：
在指定时长后执行某项操作
周期性的执行某项操作
AlarmManager对象配合Intent使用，可以定时的开启一个Activity，发送一个BroadCast，或者开启一个Service
设置一个闹钟定时，到时间会发送一个广播，定义一个广播接受者，广播接受者在挑战到一个activity进行提示操作。
//得到闹钟服务AlarmManager am = (AlarmManager)getSystemService(Context.ALARM_SERVICE);//设置闹钟public void set(View v){Calendar calendar = Calendar.getInstance();calendar.setTimeInMillis(System.currentTimeMillis());int hourOfDay =calendar.get(Calendar.HOUR_OF_DAY);int minute =calendar.get(Calendar.MINUTE);TimePickerDialog dialog = new TimePickerDialog(this,new OnTimeSetListener() {@Overridepublic void onTimeSet(TimePicker view,int hourOfDay, int minute) {// TODO Auto-generated methodstubCalendar calendar = Calendar.getInstance();calendar.setTimeInMillis(System.currentTimeMillis());calendar.set(Calendar.HOUR_OF_DAY,hourOfDay);calendar.set(Calendar.MINUTE, minute);Intent intent= new Intent(getApplicationContext(),AlarmReceiver.class);PendingIntent operation= PendingIntent.getBroadcast(getApplicationContext(), 100, intent, 0);// 要接受广播的广播接受者指定// 单次闹钟/*am.set(AlarmManager.RTC_WAKEUP,calendar.getTimeInMillis(),operation);*/// 多次闹钟am.setRepeating(AlarmManager.RTC_WAKEUP,calendar.getTimeInMillis(), 4000, operation);}},hourOfDay,minute,true);dialog.show();}//取消闹钟Intent intent = newIntent(getApplicationContext(),AlarmClockReceiver.class);PendingIntent operation =PendingIntent.getBroadcast(getApplicationContext(), 100, intent, 0);am.cancel(operation);
手势识别
手势识别使android更人性化，让我们的操作更简单，其实我们日常应用中不少地方都使用了手势识别方法，比如那么火的愤怒的小鸟中的发射武器，uc浏览器的左右滑动功能，这都是可以使用android的手势识别来实现的
手势画板控件：
<android.gesture.GestureOverlayViewandroid:id="@+id/gestureOverlayView"android:layout_width="fill_parent"android:layout_height="0dip"android:layout_weight="1"android:gestureStrokeType="multiple" ></android.gesture.GestureOverlayView>
android:gestureStrokeType="multiple"
可以设置化多笔画
把我们在自带应用里面生成的手势数据库放入我们项目的raw（新建文件夹）文件夹下面
public class MainActivity extends Activity {private GestureOverlayView g;private GestureLibrary gestureLibrary;private Gesture gesture;/** Called when the activity is first created. */@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.main);得到控件画板g =(GestureOverlayView) findViewById(R.id.gestureOverlayView);加载手势库里面的手势gestureLibrary = GestureLibraries.fromRawResource(this, R.raw.gestures);gestureLibrary.load();// 单笔识别//g.addOnGesturePerformedListener(newMyOnGesturePerformedListener()); '// 多笔识别g.addOnGesturingListener(new MyGestureListener());}private class MyGestureListener implements OnGesturingListener{@Overridepublic voidonGesturingStarted(GestureOverlayView overlay) {// TODO Auto-generated methodstub}@Overridepublic voidonGesturingEnded(GestureOverlayView overlay) {gesture = overlay.getGesture();}}/* private class MyOnGesturePerformedListenerimplements OnGesturePerformedListener{@Overridepublic voidonGesturePerformed(GestureOverlayView overlay,Gesture gesture) {// TODO Auto-generated methodstubregconize(gesture);}}*/public void ok(View v){regconize(gesture);g.clear(true);}public void cancle(View v){g.clear(true);}private void regconize(Gesture gesture){// 识别手势ArrayList<Prediction>recognizes = gestureLibrary.recognize(gesture);if (recognizes.isEmpty()) {Toast.makeText(this, "没找到该手势", 300).show();}else{// 得到匹配手势Prediction prediction = recognizes.get(0);// 得到匹配度double score = prediction.score;if(score>5){String name =prediction.name;if("call".equals(name)){Toast.makeText(this, "call", 300).show();}else if("close".equals(name)){MainActivity.this.finish();}else{Toast.makeText(this, "没找到该手势", 300).show();}}}}}
课后问题
1.怎么获取手机里面的歌曲？
通过MediaStore
2.怎么设置手机的来电铃声？
RingtoneManager.setActualDefaultRingtoneUri(
this,
RingtoneManager.TYPE_RINGTONE,
uri);
3.要设置闹钟应该使用哪个类？
AlarmManager、TimePickerDialog、setRepeating（。。。）
4.手势识别使用哪个控件？
GestureOverlayView
