Android 计时与倒计时
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Android 计时与倒计时
分类: 移动开发-Android2013-07-17 13:56 288人阅读 评论(0) 收藏 举报
方法一
Timer与TimerTask(Java实现)
- public class timerTask extends Activity{
- private int recLen = 11;
- private TextView txtView;
- Timer timer = new Timer();
- public void onCreate(Bundle savedInstanceState){
- super.onCreate(savedInstanceState);
- setContentView(R.layout.timertask);
- txtView = (TextView)findViewById(R.id.txttime);
- timer.schedule(task, 1000, 1000); // timeTask
- }
- TimerTask task = new TimerTask() {
- @Override
- public void run() {
- runOnUiThread(new Runnable() { // UI thread
- @Override
- public void run() {
- recLen--;
- txtView.setText(""+recLen);
- if(recLen < 0){
- timer.cancel();
- txtView.setVisibility(View.GONE);
- }
- }
- });
- }
- };
- }
TimerTask与Handler(不用Timer的改进型)
- public class timerTask extends Activity{
- private int recLen = 11;
- private TextView txtView;
- Timer timer = new Timer();
- public void onCreate(Bundle savedInstanceState){
- super.onCreate(savedInstanceState);
- setContentView(R.layout.timertask);
- txtView = (TextView)findViewById(R.id.txttime);
- timer.schedule(task, 1000, 1000); // timeTask
- }
- final Handler handler = new Handler(){
- @Override
- public void handleMessage(Message msg){
- switch (msg.what) {
- case 1:
- txtView.setText(""+recLen);
- if(recLen < 0){
- timer.cancel();
- txtView.setVisibility(View.GONE);
- }
- }
- }
- };
- TimerTask task = new TimerTask() {
- @Override
- public void run() {
- recLen--;
- Message message = new Message();
- message.what = 1;
- handler.sendMessage(message);
- }
- };
- }
方法三
Handler与Message(不用TimerTask)
- public class timerTask extends Activity{
- private int recLen = 11;
- private TextView txtView;
- public void onCreate(Bundle savedInstanceState) {
- super.onCreate(savedInstanceState);
- setContentView(R.layout.timertask);
- txtView = (TextView)findViewById(R.id.txttime);
- Message message = handler.obtainMessage(1); // Message
- handler.sendMessageDelayed(message, 1000);
- }
- final Handler handler = new Handler(){
- public void handleMessage(Message msg){ // handle message
- switch (msg.what) {
- case 1:
- recLen--;
- txtView.setText("" + recLen);
- if(recLen > 0){
- Message message = handler.obtainMessage(1);
- handler.sendMessageDelayed(message, 1000); // send message
- }else{
- txtView.setVisibility(View.GONE);
- }
- }
- super.handleMessage(msg);
- }
- };
- }
方法四
Handler与Thread(不占用UI线程)
- public class timerTask extends Activity{
- private int recLen = 0;
- private TextView txtView;
- public void onCreate(Bundle savedInstanceState){
- super.onCreate(savedInstanceState);
- setContentView(R.layout.timertask);
- txtView = (TextView)findViewById(R.id.txttime);
- new Thread(new MyThread()).start(); // start thread
- }
- final Handler handler = new Handler(){ // handle
- public void handleMessage(Message msg){
- switch (msg.what) {
- case 1:
- recLen++;
- txtView.setText("" + recLen);
- }
- super.handleMessage(msg);
- }
- };
- public class MyThread implements Runnable{ // thread
- @Override
- public void run(){
- while(true){
- try{
- Thread.sleep(1000); // sleep 1000ms
- Message message = new Message();
- message.what = 1;
- handler.sendMessage(message);
- }catch (Exception e) {
- }
- }
- }
- }
- }
方法五
Handler与Runnable(最简单型)
- public class timerTask extends Activity{
- private int recLen = 0;
- private TextView txtView;
- public void onCreate(Bundle savedInstanceState){
- super.onCreate(savedInstanceState);
- setContentView(R.layout.timertask);
- txtView = (TextView)findViewById(R.id.txttime);
- handler.postDelayed(runnable, 1000);
- }
- Handler handler = new Handler();
- Runnable runnable = new Runnable() {
- @Override
- public void run() {
- recLen++;
- txtView.setText("" + recLen);
- handler.postDelayed(this, 1000);
- }
- };
- }
计时与倒计时
方法1,方法2和方法3,都是倒计时
方法4,方法5,都是计时
计时和倒计时,都可使用上述方法实现(代码稍加改动)
UI线程比较
方法1,方法2和方法3,都是在UI线程实现的计时;
方法4和方法5,是另开Runnable线程实现计时
实现方式比较
方法1,采用的是Java实现,即Timer和TimerTask方式;
其它四种方法,都采用了Handler消息处理
推荐使用
如果对UI线程交互要求不很高,可以选择方法2和方法3
如果考虑到UI线程阻塞,严重影响到用户体验,推荐使用方法4,另起线程单独用于计时和其它的逻辑处理
方法5,综合了前几种方法的优点,是最简的
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