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);
}
};
}
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);
}
};
}
