Android使用CountDownTimer类实现倒计时闹钟

2023-09-17 08:30:08 54

packagecom.home.brewclock; importandroid.app.Activity; importandroid.media.MediaPlayer; importandroid.os.Bundle; importandroid.os.CountDownTimer; importandroid.view.View; importandroid.view.View.OnClickListener; importandroid.widget.Button; importandroid.widget.TextView; publicclassMainActivityextendsActivityimplementsOnClickListener{ privateButtonaddTimeBtn; privateButtondecreaseTimeBtn; privateButtonstartBtn; privateButtoncloseMusicBtn; privateTextViewtimeText; privateintbrewTime=3; privateCountDownTimercountDownTimer; privatebooleanisBrewing=false; privateMediaPlayeralarmMusic; @Override publicvoidonCreate(BundlesavedInstanceState){ super.onCreate(savedInstanceState); setContentView(R.layout.main); addTimeBtn=(Button)findViewById(R.id.main_btn_up); decreaseTimeBtn=(Button)findViewById(R.id.main_btn_down); startBtn=(Button)findViewById(R.id.main_start); closeMusicBtn=(Button)findViewById(R.id.main_btn_close_music); timeText=(TextView)findViewById(R.id.main_tv); addTimeBtn.setOnClickListener(this); decreaseTimeBtn.setOnClickListener(this); startBtn.setOnClickListener(this); closeMusicBtn.setOnClickListener(this); setBrewTime(3); } /** *设置闹钟倒计时初始值 * *@paramminutes */ publicvoidsetBrewTime(intminutes){ if(isBrewing) return; brewTime=minutes; if(brewTime<1){ brewTime=1; } timeText.setText(String.valueOf(brewTime)+"m"); } /** *开启闹钟 */ publicvoidstartBrew(){ //创建一个CountDownTimer对象记录闹钟时间 countDownTimer=newCountDownTimer(brewTime*60*1000,1000){ @Override publicvoidonTick(longmillisUntilFinished){ timeText.setText(String.valueOf(millisUntilFinished/1000) +"s"); } @Override publicvoidonFinish(){ isBrewing=false; timeText.setText(brewTime+"m"); startBtn.setText("Start"); //加载指定音乐，并为之创建MediaPlayer对象 alarmMusic=MediaPlayer.create(MainActivity.this,R.raw.music); //设置为循环播放 alarmMusic.setLooping(true); //播放音乐 alarmMusic.start(); closeMusicBtn.setVisibility(0); } }; countDownTimer.start(); startBtn.setText("Stop"); isBrewing=true; } /** *停止计时 */ publicvoidstopBrew(){ if(countDownTimer!=null){ countDownTimer.cancel(); } isBrewing=false; startBtn.setText("Start"); } @Override publicvoidonClick(Viewv){ if(v==addTimeBtn){ setBrewTime(brewTime+1); }elseif(v==decreaseTimeBtn){ setBrewTime(brewTime-1); }elseif(v==startBtn){ if(isBrewing){ stopBrew(); }else{ startBrew(); } }elseif(v==closeMusicBtn){ if(alarmMusic!=null){ alarmMusic.stop(); closeMusicBtn.setVisibility(8); } } } }

Android使用CountDownTimer类实现倒计时闹钟

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