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android 关于闹钟

news 来源：原创 2024/5/4 16:04:58

以下是我发现的几点闹钟中重要的点，分享一下：

（1）在闹钟中有AudioManager管理机制，这个机制可以申请和释放OnAudioFocusChangeListener监听。

还有mTelephonyManager对象，处理在闹钟响的时候，来电铃声的切换。

（2）广播接收闹钟，通过广播启动AlarmKlaxon这个Service，隐式启动service：

public static final String ALARM_INTENT_EXTRA = "intent.extra.alarm";

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 //Playthealarmalertandvibratethedevice. 
 IntentplayAlarm=newIntent(Alarms.ALARM_ALERT_ACTION); 
 playAlarm.putExtra(Alarms.ALARM_INTENT_EXTRA,alarm); 
 context.startService(playAlarm); 

在mainfest中，AlarmKlaxon这个服务的定义如下：

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 <serviceandroid:name="AlarmKlaxon" 
 android:description="@string/alarm_klaxon_service_desc" 
 > 
 <intent-filter> 
 <actionandroid:name="com.cn.daming.deskclock.ALARM_ALERT"/> 
 </intent-filter> 
 </service> 

这个service做的是允许别的Activity打断正在响铃的铃声，播放其他的铃声，例如，闹钟响的时候来电话了。

（3）在listview中包含checkbox，这时候闹钟的处理时，activity实现一个OnItemClickListener的监听，点击每一项的监听。然后在checkbox单独拿出去写一个类，继承LinearLayout，重写setPressed（）这个方法，以实现“当点击checkbox的时候不触发parent的click事件”。关键代码如下：

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 <spanstyle="font-size:18px;">@Override 
 publicvoidsetPressed(booleanpressed){ 
 //Iftheparentispressed,donotsettopressed. 
 if(pressed&&((View)getParent()).isPressed()){ 
 return; 
 } 
 super.setPressed(pressed); 
 }</span> 

点击新建闹钟出现的界面设置好时间弹出的toast。

下面我把我的主要入口类的代码贴出来：

DeskClockMainActivity.java

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 <spanstyle="font-size:18px;">packagecom.cn.daming.deskclock; 
  
 importjava.util.Calendar; 
  
 importandroid.app.Activity; 
 importandroid.app.AlertDialog; 
 importandroid.content.Context; 
 importandroid.content.DialogInterface; 
 importandroid.content.Intent; 
 importandroid.content.SharedPreferences; 
 importandroid.database.Cursor; 
 importandroid.graphics.Typeface; 
 importandroid.os.Bundle; 
 importandroid.view.LayoutInflater; 
 importandroid.view.Menu; 
 importandroid.view.MenuItem; 
 importandroid.view.View; 
 importandroid.view.ContextMenu; 
 importandroid.view.ContextMenu.ContextMenuInfo; 
 importandroid.view.View.OnClickListener; 
 importandroid.view.ViewGroup; 
 importandroid.widget.AdapterView; 
 importandroid.widget.AdapterView.AdapterContextMenuInfo; 
 importandroid.widget.AdapterView.OnItemClickListener; 
 importandroid.widget.CheckBox; 
 importandroid.widget.CursorAdapter; 
 importandroid.widget.ImageButton; 
 importandroid.widget.ImageView; 
 importandroid.widget.ListView; 
 importandroid.widget.TextView; 
  
 publicclassDeskClockMainActivityextendsActivityimplementsOnItemClickListener{ 
  
 staticfinalStringPREFERENCES="AlarmClock"; 
  
 /**Thismustbefalseforproduction.Iftrue,turnsonlogging, 
 testcode,etc.*/ 
 staticfinalbooleanDEBUG=false; 
  
 privateSharedPreferencesmPrefs; 
 privateLayoutInflatermFactory; 
 privateListViewmAlarmsList; 
 privateCursormCursor; 
  
 @Override 
 publicvoidonCreate(BundlesavedInstanceState){ 
 super.onCreate(savedInstanceState); 
  
 //取自定义布局的LayoutInflater 
 mFactory=LayoutInflater.from(this); 
 //取getSharedPreferences中key==“AlarmClock”的值 
 mPrefs=getSharedPreferences(PREFERENCES,0); 
 //获取闹钟的cursor 
 mCursor=Alarms.getAlarmsCursor(getContentResolver()); 
  
 //更新布局界面 
 updateLayout(); 
  
 } 
  
 //加载更新界面布局 
 privatevoidupdateLayout(){ 
 setContentView(R.layout.alarm_clock); 
 mAlarmsList=(ListView)findViewById(R.id.alarms_list); 
 AlarmTimeAdapteradapter=newAlarmTimeAdapter(this,mCursor); 
 mAlarmsList.setAdapter(adapter); 
 mAlarmsList.setVerticalScrollBarEnabled(true); 
 mAlarmsList.setOnItemClickListener(this); 
 mAlarmsList.setOnCreateContextMenuListener(this); 
  
 ViewaddAlarm=findViewById(R.id.add_alarm); 
 addAlarm.setOnClickListener(newView.OnClickListener(){ 
 publicvoidonClick(Viewv){ 
 addNewAlarm(); 
 } 
 }); 
 //Maketheentireviewselectedwhenfocused. 
 addAlarm.setOnFocusChangeListener(newView.OnFocusChangeListener(){ 
 publicvoidonFocusChange(Viewv,booleanhasFocus){ 
 v.setSelected(hasFocus); 
 } 
 }); 
  
 ImageButtondeskClock= 
 (ImageButton)findViewById(R.id.desk_clock_button); 
 deskClock.setOnClickListener(newView.OnClickListener(){ 
 publicvoidonClick(Viewv){ 
  
 } 
 }); 
 } 
  
 privatevoidaddNewAlarm(){ 
 startActivity(newIntent(this,SetAlarm.class)); 
 } 
  
 /** 
 *listview的适配器继承CursorAdapter 
 *@authorwangxianming 
 *也可以使用BaseAdapter 
 */ 
 privateclassAlarmTimeAdapterextendsCursorAdapter{ 
 publicAlarmTimeAdapter(Contextcontext,Cursorcursor){ 
 super(context,cursor); 
 } 
  
 publicViewnewView(Contextcontext,Cursorcursor,ViewGroupparent){ 
 Viewret=mFactory.inflate(R.layout.alarm_time,parent,false); 
  
 DigitalClockdigitalClock= 
 (DigitalClock)ret.findViewById(R.id.digitalClock); 
 digitalClock.setLive(false); 
 returnret; 
 } 
  
 //把view绑定cursor的每一项 
 publicvoidbindView(Viewview,Contextcontext,Cursorcursor){ 
 finalAlarmalarm=newAlarm(cursor); 
  
 Viewindicator=view.findViewById(R.id.indicator); 
  
 //Settheinitialresourceforthebarimage. 
 finalImageViewbarOnOff= 
 (ImageView)indicator.findViewById(R.id.bar_onoff); 
 barOnOff.setImageResource(alarm.enabled? 
 R.drawable.ic_indicator_on:R.drawable.ic_indicator_off); 
  
 //Settheinitialstateoftheclock"checkbox" 
 finalCheckBoxclockOnOff= 
 (CheckBox)indicator.findViewById(R.id.clock_onoff); 
 clockOnOff.setChecked(alarm.enabled); 
  
 //Clickingoutsidethe"checkbox"shouldalsochangethestate. 
 //对checkbox设置监听，使里外一致 
 indicator.setOnClickListener(newOnClickListener(){ 
 publicvoidonClick(Viewv){ 
 clockOnOff.toggle(); 
 updateIndicatorAndAlarm(clockOnOff.isChecked(), 
 barOnOff,alarm); 
 } 
 }); 
  
 DigitalClockdigitalClock= 
 (DigitalClock)view.findViewById(R.id.digitalClock); 
  
 //setthealarmtext 
 finalCalendarc=Calendar.getInstance(); 
 c.set(Calendar.HOUR_OF_DAY,alarm.hour); 
 c.set(Calendar.MINUTE,alarm.minutes); 
 digitalClock.updateTime(c); 
 digitalClock.setTypeface(Typeface.DEFAULT); 
  
 //Settherepeattextorleaveitblankifitdoesnotrepeat. 
 TextViewdaysOfWeekView= 
 (TextView)digitalClock.findViewById(R.id.daysOfWeek); 
 finalStringdaysOfWeekStr= 
 alarm.daysOfWeek.toString(DeskClockMainActivity.this,false); 
 if(daysOfWeekStr!=null&&daysOfWeekStr.length()!=0){ 
 daysOfWeekView.setText(daysOfWeekStr); 
 daysOfWeekView.setVisibility(View.VISIBLE); 
 }else{ 
 daysOfWeekView.setVisibility(View.GONE); 
 } 
  
 //Displaythelabel 
 TextViewlabelView= 
 (TextView)view.findViewById(R.id.label); 
 if(alarm.label!=null&&alarm.label.length()!=0){ 
 labelView.setText(alarm.label); 
 labelView.setVisibility(View.VISIBLE); 
 }else{ 
 labelView.setVisibility(View.GONE); 
 } 
 } 
 }; 
  
 //更新checkbox 
 privatevoidupdateIndicatorAndAlarm(booleanenabled,ImageViewbar, 
 Alarmalarm){ 
 bar.setImageResource(enabled?R.drawable.ic_indicator_on 
 :R.drawable.ic_indicator_off); 
 Alarms.enableAlarm(this,alarm.id,enabled); 
 if(enabled){ 
 SetAlarm.popAlarmSetToast(this,alarm.hour,alarm.minutes, 
 alarm.daysOfWeek); 
 } 
 } 
  
 /* 
 *(non-Javadoc) 
 *@seeandroid.app.Activity#onContextItemSelected(android.view.MenuItem) 
 *创建上下文菜单 
 */ 
 @Override 
 publicbooleanonContextItemSelected(finalMenuItemitem){ 
 finalAdapterContextMenuInfoinfo= 
 (AdapterContextMenuInfo)item.getMenuInfo(); 
 finalintid=(int)info.id; 
 //Errorcheckjustincase. 
 if(id==-1){ 
 returnsuper.onContextItemSelected(item); 
 } 
 switch(item.getItemId()){ 
 caseR.id.delete_alarm: 
 //Confirmthatthealarmwillbedeleted. 
 newAlertDialog.Builder(this) 
 .setTitle(getString(R.string.delete_alarm)) 
 .setMessage(getString(R.string.delete_alarm_confirm)) 
 .setPositiveButton(android.R.string.ok, 
 newDialogInterface.OnClickListener(){ 
 publicvoidonClick(DialogInterfaced, 
 intw){ 
 Alarms.deleteAlarm(DeskClockMainActivity.this,id); 
 } 
 }) 
 .setNegativeButton(android.R.string.cancel,null) 
 .show(); 
 returntrue; 
  
 caseR.id.enable_alarm: 
 finalCursorc=(Cursor)mAlarmsList.getAdapter() 
 .getItem(info.position); 
 finalAlarmalarm=newAlarm(c); 
 Alarms.enableAlarm(this,alarm.id,!alarm.enabled); 
 if(!alarm.enabled){ 
 SetAlarm.popAlarmSetToast(this,alarm.hour,alarm.minutes, 
 alarm.daysOfWeek); 
 } 
 returntrue; 
  
 caseR.id.edit_alarm: 
 Intentintent=newIntent(this,SetAlarm.class); 
 intent.putExtra(Alarms.ALARM_ID,id); 
 startActivity(intent); 
 returntrue; 
  
 default: 
 break; 
 } 
 returnsuper.onContextItemSelected(item); 
 } 
  
 /* 
 *(non-Javadoc) 
 *@seeandroid.app.Activity#onCreateContextMenu(android.view.ContextMenu,android.view.View,android.view.ContextMenu.ContextMenuInfo) 
 *创建菜单 
 */ 
 @Override 
 publicvoidonCreateContextMenu(ContextMenumenu,Viewview, 
 ContextMenuInfomenuInfo){ 
 //Inflatethemenufromxml. 
 getMenuInflater().inflate(R.menu.context_menu,menu); 
  
 //Usethecurrentitemtocreateacustomviewfortheheader. 
 finalAdapterContextMenuInfoinfo=(AdapterContextMenuInfo)menuInfo; 
 finalCursorc= 
 (Cursor)mAlarmsList.getAdapter().getItem((int)info.position); 
 finalAlarmalarm=newAlarm(c); 
  
 //ConstructtheCalendartocomputethetime. 
 finalCalendarcal=Calendar.getInstance(); 
 cal.set(Calendar.HOUR_OF_DAY,alarm.hour); 
 cal.set(Calendar.MINUTE,alarm.minutes); 
 finalStringtime=Alarms.formatTime(this,cal); 
  
 //InflatethecustomviewandseteachTextView'stext. 
 finalViewv=mFactory.inflate(R.layout.context_menu_header,null); 
 TextViewtextView=(TextView)v.findViewById(R.id.header_time); 
 textView.setText(time); 
 textView=(TextView)v.findViewById(R.id.header_label); 
 textView.setText(alarm.label); 
  
 //Setthecustomviewonthemenu. 
 menu.setHeaderView(v); 
 //Changethetextbasedonthestateofthealarm. 
 if(alarm.enabled){ 
 menu.findItem(R.id.enable_alarm).setTitle(R.string.disable_alarm); 
 } 
 } 
  
 /* 
 *(non-Javadoc) 
 *@seeandroid.app.Activity#onOptionsItemSelected(android.view.MenuItem) 
 *设置菜单的点击事件的处理 
 */ 
 @Override 
 publicbooleanonOptionsItemSelected(MenuItemitem){ 
 switch(item.getItemId()){ 
 caseR.id.menu_item_settings: 
 startActivity(newIntent(this,SettingsActivity.class)); 
 returntrue; 
 caseR.id.menu_item_desk_clock: 
 //modifybywangxianmingin2012-4-14 
 //startActivity(newIntent(this,DeskClock.class)); 
 returntrue; 
 caseR.id.menu_item_add_alarm: 
 addNewAlarm(); 
 returntrue; 
 default: 
 break; 
 } 
 returnsuper.onOptionsItemSelected(item); 
 } 
  
 /* 
 *(non-Javadoc) 
 *@seeandroid.app.Activity#onCreateOptionsMenu(android.view.Menu) 
 *创建菜单 
 */ 
 @Override 
 publicbooleanonCreateOptionsMenu(Menumenu){ 
 getMenuInflater().inflate(R.menu.alarm_list_menu,menu); 
 returnsuper.onCreateOptionsMenu(menu); 
 } 
  
 /* 
 *(non-Javadoc) 
 *@seeandroid.widget.AdapterView.OnItemClickListener#onItemClick(android.widget.AdapterView,android.view.View,int,long) 
 *创建菜单的点击事件响应 
 */ 
 publicvoidonItemClick(AdapterView<?>adapterView,Viewv,intpos,longid){ 
 Intentintent=newIntent(this,SetAlarm.class); 
 intent.putExtra(Alarms.ALARM_ID,(int)id); 
 startActivity(intent); 
  
 } 
  
 @Override 
 protectedvoidonDestroy(){ 
 super.onDestroy(); 
 ToastMaster.cancelToast(); 
 mCursor.close(); 
 } 
 }</span>  