Android中的倒计时
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一、在Android中使用到的计时/倒计时方式
1，统一布局文件 activity_main.xml文件
<span style="font-size:18px;"><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" tools:context=".MainActivity"> //用于显示计时效果 <TextView android:id="@+id/show" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/hello_world" android:textSize="20sp" /></RelativeLayout></span>2，具体实现方式
（一）Timer、TimerTask 【倒计时模式】
<span style="font-size:18px;">public class MainActivity extends Activity { private TextView tv; private int timeDownStart = 88; Timer timer = new Timer(); @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); tv = (TextView) findViewById(R.id.show); //延迟2秒 执行周期：每隔1秒执行一次 timer.schedule(task, 2000, 1000);} /** * 第一种倒计时方式：Timer 和 TimerTask */ TimerTask task = new TimerTask() { @Override public void run() { runOnUiThread(new Runnable() { @Override public void run() { timeDownStart--; tv.setText(timeDownStart + ""); if (timeDownStart < 0) { timer.cancel(); tv.setText("tv finish----------"); } } }); } };}</span>（二）Timer、TimerTask、Handler 【倒计时模式】<span style="font-size:18px;">public class MainActivity extends Activity { private TextView tv; private int timeDownStart = 66; Timer timer = new Timer(); @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); tv = (TextView) findViewById(R.id.show); timer.schedule(task, 0, 1000);//不延迟} /** * 第二种倒计时方式 */ TimerTask task = new TimerTask() { @Override public void run() { timeDownStart--; Message msg = new Message(); msg.what = 1; handler.sendMessage(msg); } }; Handler handler = new Handler() { @Override public void handleMessage(Message msg) { switch (msg.what) { case 1: tv.setText(timeDownStart + ""); if (timeDownStart < 0) { timer.cancel(); tv.setText("tv finish!"); } break; } super.handleMessage(msg); } };}</span>（三）Handler 和Message 【倒计时模式】<span style="font-size:18px;">public class MainActivity extends Activity { private TextView tv; private int timeDownStart = 66; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); tv = (TextView) findViewById(R.id.show); Message msg = handler.obtainMessage(1); handler.sendMessageDelayed(msg, 1000);} /** * 第三种倒计时方式 */ Handler handler = new Handler() { @Override public void handleMessage(Message msg) { switch (msg.what) { case 1: timeDownStart--; tv.setText(timeDownStart + ""); if (timeDownStart > 0) { Message msg = handler.obtainMessage(1); handler.sendMessageDelayed(msg, 1000); } else { tv.setText("tv finish~_~"); } break; } super.handleMessage(msg); } };}</span>（四）Handler 和 Thread 【计时模式】
<span style="font-size:18px;">public class MainActivity extends Activity { /** * 第四种计时方式：Handler 和 Thread */ private TextView tv; private int startNum = 0; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); tv = (TextView) findViewById(R.id.show); new Thread(new MyThread()).start();//没有停止} /** * 第四种计时方式 */ class MyThread implements Runnable { @Override public void run() { while (true) { try { Thread.sleep(1000); Message msg = new Message(); msg.what = 1; handler.sendMessage(msg); } catch (InterruptedException e) { e.printStackTrace(); } } } } Handler handler = new Handler() { @Override public void handleMessage(Message msg) { switch (msg.what) { case 1: startNum++; tv.setText(startNum + ""); break; } super.handleMessage(msg); } };}</span>（五）Handler 和 Runnable【计时模式】<span style="font-size:18px;">public class MainActivity extends Activity { /** * 第五种计时方式：Handler 和 Runnable */ private TextView tv; private int startNum = 0; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); tv = (TextView) findViewById(R.id.show); handler.postDelayed(runnable, 1000);} /** * 第五种计时方式 */ Handler handler = new Handler(); Runnable runnable = new Runnable() { @Override public void run() { startNum++; tv.setText(startNum + ""); handler.postDelayed(runnable, 1000); } };}</span>（六）CountDownTimer【倒计时模式】<span style="font-size:18px;">public class MainActivity extends Activity { /** * 第六种倒计时方式：CountDownTimer */ private MyCount mc; private TextView tv; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); tv = (TextView) findViewById(R.id.show); mc = new MyCount(30000, 1000); mc.start();} /** * 第六种倒计时方式：CountDownTimer */ class MyCount extends CountDownTimer { public MyCount(long millisInFuture, long countDownInterval) { super(millisInFuture, countDownInterval); } @Override public void onTick(long millisUntilFinished) { tv.setText("请等待30秒(" + millisUntilFinished / 1000 + ")..."); Toast.makeText(MainActivity.this, "bababba", Toast.LENGTH_SHORT); //toast有延迟显示 } @Override public void onFinish() { tv.setText("tv finish。。。。。。"); } }}</span> 第五种方式最简洁，第六种方式最实用；Handler会实时刷新界面，同时也就最耗资源；开启子线程启动刷新比较合理，但是在销毁的时候一定先销毁子线程，释放资源。二、时间选择器
1，时间选择xml布局文件 date_picker_layout
<span style="font-size:18px;"><?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical"> <DatePicker android:id="@+id/datePicker" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="center_horizontal" /> <EditText android:id="@+id/dateEt" android:layout_width="fill_parent" android:layout_height="wrap_content" android:cursorVisible="false" android:editable="false" /> <TimePicker android:id="@+id/timePicker" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="center_horizontal" /> <EditText android:id="@+id/timeEt" android:layout_width="fill_parent" android:layout_height="wrap_content" android:cursorVisible="false" android:editable="false" /></LinearLayout></span>
2，实现主类
<span style="font-size:18px;">public class DatePickerActivity extends Activity { private EditText dateEt = null; private EditText timeEt = null; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.date_picker_layout); dateEt = (EditText) findViewById(R.id.dateEt); timeEt = (EditText) findViewById(R.id.timeEt); DatePicker datePicker = (DatePicker) findViewById(R.id.datePicker); TimePicker timePicker = (TimePicker) findViewById(R.id.timePicker); /****************************************************************************/ datePicker.updateDate(2014,10,10); timePicker.setCurrentHour(16); /****************************************************************************/ Calendar calendar = Calendar.getInstance();// int year = calendar.get(Calendar.YEAR);// int monthOfYear = calendar.get(Calendar.MONTH);// int dayOfMonth = calendar.get(Calendar.DAY_OF_MONTH); //year, monthOfYear, dayOfMonth, datePicker.init(2014,8,15, new DatePicker.OnDateChangedListener() { public void onDateChanged(DatePicker view, int year, int monthOfYear, int dayOfMonth) { dateEt.setText("您选择的日期是：" + year + "年" + (monthOfYear + 1) + "月" + dayOfMonth + "日"); } }); timePicker.setOnTimeChangedListener(new TimePicker.OnTimeChangedListener() { public void onTimeChanged(TimePicker view, int hourOfDay, int minute) { timeEt.setText("您选择的时间是：" + hourOfDay + "时" + minute + "分"); } }); }</span><span style="font-size:18px;">}</span>效果图：
三、倒计时实现
1，布局文件
（一）设置开始时间 time_out_layout
<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent"> <DigitalClock android:id="@+id/myClock" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentTop="true" android:layout_centerHorizontal="true" android:layout_margin="10dp" android:textSize="30sp" /> <TextView android:id="@+id/text_select" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_below="@id/myClock" android:layout_centerHorizontal="true" android:text="设置时间" android:textSize="20sp" /> <EditText android:id="@+id/minute" android:layout_width="60dp" android:layout_height="80dp" android:layout_alignLeft="@id/myClock" android:layout_below="@id/text_select" android:layout_marginTop="20dp" android:gravity="center" android:inputType="number" /> <EditText android:id="@+id/second" android:layout_width="60dp" android:layout_height="80dp" android:layout_below="@id/text_select" android:layout_marginTop="20dp" android:layout_toRightOf="@id/minute" android:gravity="center" android:inputType="number" /> <Button android:id="@+id/button_start" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_alignParentBottom="true" android:gravity="center" android:padding="10dp" android:text="开始倒计时" android:textSize="30sp" /></RelativeLayout>
（二）展示倒计时效果 start.xml
<span style="font-size:18px;"><?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent"> <TextView android:id="@+id/myTime" android:layout_width="fill_parent" android:layout_height="fill_parent" android:layout_margin="30dp" android:gravity="center" android:textColor="#FF0000" android:textSize="100sp" android:textStyle="bold" /></LinearLayout></span>2，实现主类
（一）TimeOutActivity
public class TimeOutActivity extends Activity { Button startButton; EditText minuteText; EditText secondText; int minute; int second; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); requestWindowFeature(Window.FEATURE_NO_TITLE); setContentView(R.layout.time_out_layout); startButton = (Button) findViewById(R.id.button_start); minuteText = (EditText)findViewById(R.id.minute); secondText = (EditText)findViewById(R.id.second); startButton.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { if (!minuteText.getText().toString().equals("")) { minute = Integer.parseInt(minuteText.getText().toString()); } if (!secondText.getText().toString().equals("")) { second = Integer.parseInt(secondText.getText().toString()); } if (minute != 0 || second != 0) { System.out.println(minute+":"+second); ArrayList<Integer> list = new ArrayList<Integer>(); list.add(minute); list.add(second); Intent intent = new Intent(TimeOutActivity.this,StartActivity.class); intent.putIntegerArrayListExtra("times", list); startActivity(intent); } } }); } @Override protected void onResume() { minute = 0; second = 0; super.onResume(); }}（二）StartActivity
public class StartActivity extends Activity{ static int minute = -1; static int second = -1; TextView timeView; Timer timer; TimerTask timerTask; Handler handler = new Handler(){ public void handleMessage(Message msg) { System.out.println("handle!"); if (minute == 0) { if (second == 0) { timeView.setText("Time out !"); if (timer != null) { timer.cancel(); timer = null; } if (timerTask != null) { timerTask = null; } }else { second--; if (second >= 10) { timeView.setText("0"+minute + ":" + second); }else { timeView.setText("0"+minute + ":0" + second); } } }else { if (second == 0) { second =59; minute--; if (minute >= 10) { timeView.setText(minute + ":" + second); }else { timeView.setText("0"+minute + ":" + second); } }else { second--; if (second >= 10) { if (minute >= 10) { timeView.setText(minute + ":" + second); }else { timeView.setText("0"+minute + ":" + second); } }else { if (minute >= 10) { timeView.setText(minute + ":0" + second); }else { timeView.setText("0"+minute + ":0" + second); } } } } }; }; @Override protected void onCreate(Bundle savedInstanceState) { requestWindowFeature(Window.FEATURE_NO_TITLE); super.onCreate(savedInstanceState); setContentView(R.layout.start); timeView = (TextView)findViewById(R.id.myTime); if (minute == -1 && second == -1) { Intent intent = getIntent(); ArrayList<Integer> times = intent.getIntegerArrayListExtra("times"); minute = times.get(0); second = times.get(1); } timeView.setText(minute + ":" + second); timerTask = new TimerTask() { @Override public void run() { Message msg = new Message(); msg.what = 0; handler.sendMessage(msg); } }; timer = new Timer(); timer.schedule(timerTask,0,1000); } @Override protected void onDestroy() { if (timer != null) { timer.cancel(); timer = null; } if (timerTask != null) { timerTask = null; } minute = -1; second = -1; super.onDestroy(); }}展示效果：
倒计时例子Demo
一个小小的提醒，做设计的人不应该和做执行的人多接触；设计要的是天马行空，完美；而做实际的人一直在克服难题，总是在不断超越中。若是可以和设计谈判，那么执行就没有那么背水一战！
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