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设置

Timer以每3秒运行一次

TimerTask.

TimerTask只需要调用按钮的

setText方法来更改按钮的文本.您必须在UI线程中执行此操作,因此您应该使用post来运行将执行更新的正确线程的

Runnable对象.

例如,在以下活动中,字母“A”每三秒添加到按钮的文本中：

public class ButtonTest extends Activity {

/** Called when the activity is first created. */

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

Button subject = new Button(this);

subject.setLayoutParams((new LayoutParams(LayoutParams.WRAP_CONTENT,

LayoutParams.WRAP_CONTENT)));

subject.setText("A");

setContentView(subject);

Timer timing = new Timer();

timing.schedule(new Updater(subject), 3000, 3000);

}

private static class Updater extends TimerTask {

private final Button subject;

public Updater(Button subject) {

this.subject = subject;

}

@Override

public void run() {

subject.post(new Runnable() {

public void run() {

subject.setText(subject.getText() + "A");

}

});

}

}

}