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我有一个观点,我想添加一个天文台到它。然后,在绘制我想显示当前时间。这是我做过的:Android天文台不启动
public class MyView extends View {
private Chronometer chrono;
private long elapsedTime=0;
private String currentTime="00:00:00";
public MyView(Context context) {
super(context);
// TODO Auto-generated constructor stub
init(context);
}
private void init(Context ctx){
chrono= new Chronometer(ctx);
chrono.setText("Time: 00:00:00");
chrono.setOnChronometerTickListener(new OnChronometerTickListener()
{
public void onChronometerTick(Chronometer arg0) {
String HH =((elapsedTime/3600) < 10 ? "0" : "") + (elapsedTime/3600);
String MM =((elapsedTime/60) < 10 ? "0" : "") + (elapsedTime/60);
String SS =((elapsedTime % 60) < 10 ? "0" : "") + (elapsedTime % 60);
String currentTime = HH+":"+MM+":"+SS;
elapsedTime = (SystemClock.elapsedRealtime() - arg0.getBase())/1000;
arg0.setText(currentTime);
}
}
);
}
chrono.setBase(SystemClock.elapsedRealtime());
chrono.start();
}
@Override
protected void onDraw(Canvas canvas) {
canvas.drawText(currentTime, someWidth , someHeight, somePaint);
}
初始文本00:00:00被绘制,但它不会改变。我一定做错了什么。有任何想法吗 ?
尝试在您的重写函数内调用“super.onDraw(canvas)”。 – st0le 2010-09-28 08:56:22
btw,其中是'chrono.start()'和'chrono.setBase()'位于何处?在'onCreate()'里面? – st0le 2010-09-28 08:57:09
chrono.start()是insde()。我在onDraw的底部添加了super.onDraw(canvas),但仍然没有效果。不会更新。 – Alin 2010-09-28 11:32:40