倒计时
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Android实现计时与倒计时的五种方法:
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);
- }
- }
- });
- }
- };
- }
方法二
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);
- }
- };
- }
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);
- }
- };
- }
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