在你的情况下，你正在使用线程。因此，你无法从ui线程以外的其他线程更新ui。所以你用runOnUithread。我建议你使用倒数计时器或处理程序。
1.CountDownTimer
http://developer.android.com/reference/android/os/CountDownTimer.html
倒数计时器，以分钟和秒为单位
例：
public class MainActivity extends Activity {
Button b;
TextView tv;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
tv = (TextView) findViewById(R.id.textView1);
b= (Button) findViewById(R.id.button1);
b.setOnClickListener(new OnClickListener()
{
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
startTimer(200000);
}
});
}
private void startTimer(long time){
CountDownTimer counter = new CountDownTimer(30000, 1000){
public void onTick(long millisUntilDone){
Log.d("counter_label", "Counter text should be changed");
tv.setText("You have " + millisUntilDone + "ms");
}
public void onFinish() {
tv.setText("DONE!");
}
}.start();
}
}
2.你可以使用 Handler
范例：
Handler m_handler;
Runnable m_handlerTask ;
int timeleft=100;
m_handler = new Handler();
m_handlerTask = new Runnable()
{
@Override
public void run() {
if(timeleft>=0)
{
// do stuff
Log.i("timeleft",""+timeleft);
timeleft--;
}
else
{
m_handler.removeCallbacks(m_handlerTask); // cancel run
}
m_handler.postDelayed(m_handlerTask, 1000);
}
};
m_handlerTask.run();
3.计时器
计时器在其他线程上运行。你应该在ui线程上更新ui。采用runOnUiThread
范例：
int timeleft=100;
Timer _t = new Timer();
_t.scheduleAtFixedRate( new TimerTask() {
@Override
public void run() {
runOnUiThread(new Runnable() //run on ui thread
{
public void run()
{
Log.i("timeleft",""+timeleft);
//update ui
}
});
if(timeleft>==0)
{
timeleft--;
}
else
{
_t.cancel();
}
}
}, 1000, 1000 );
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