我想让我的可运行设备每.75秒更新一次我的UI,我不想使用AsyncTask。但是TextView只在for循环的末尾设置,为什么?
...
robotWords = "........Hey hello user!!!";
wordSize = robotWords.length();
mHandler.postDelayed(r, 750);
}
private Runnable r = new Runnable()
{
public void run()
{
for(int i=0; i<wordSize; i++)
{
robotTextView.setText("why this words only display on the textView at last operation on this for loop?");
Log.i(TAG, robotWords.substring(0, i));
try
{
Thread.sleep(750);
} catch (InterruptedException e)
{
e.printStackTrace();
}
}
}
};
最佳答案
由于此行Thread.sleep(750);
,因此只能在for循环的末尾设置TextView
在将文本真正设置为textview之前,您的线程将进入睡眠状态。我认为您应该每750ms调用Handler.postDelayed而不是使用Thread.sleep(750);
或使用CountDownTimer
new CountDownTimer(750 * wordSize, 750) {
public void onTick(long millisUntilFinished) {
robotTextView.setText("why this words only display on the textView at last operation on this for loop?");
Log.i(TAG, robotWords.substring(0, i));
}
public void onFinish() {
}
}。开始();
关于android - 可运行的SetText View 无法正常工作,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/12273553/