题
这是我在src中的.java文件:
package com.wao.texttime;
import java.util.Calendar;
import android.app.Activity;
import android.os.Bundle;
import android.widget.TextView;
public class TextTime extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
TextView textView = (TextView) findViewById(R.id.TextView01);
Calendar cal = Calendar.getInstance();
cal.setTimeInMillis(System.currentTimeMillis());
cal.set(Calendar.HOUR_OF_DAY, 6);
cal.set(Calendar.MINUTE, 15);
cal.set(Calendar.SECOND, 0);
long vask_1 = cal.getTimeInMillis();
cal.set(Calendar.HOUR_OF_DAY, 10);
cal.set(Calendar.MINUTE, 0);
cal.set(Calendar.SECOND, 0);
long vask_2 = cal.getTimeInMillis();
cal.set(Calendar.HOUR_OF_DAY, 14);
cal.set(Calendar.MINUTE, 0);
cal.set(Calendar.SECOND, 0);
long vask_3 = cal.getTimeInMillis();
cal.set(Calendar.HOUR_OF_DAY, 16);
cal.set(Calendar.MINUTE, 0);
cal.set(Calendar.SECOND, 0);
long vask_4 = cal.getTimeInMillis();
cal.set(Calendar.HOUR_OF_DAY, 19);
cal.set(Calendar.MINUTE, 0);
cal.set(Calendar.SECOND, 0);
long vask_5 = cal.getTimeInMillis();
long now = System.currentTimeMillis();
if(now > vask_1 && now < vask_2)
{
textView.setText("5");
}
else if(now > vask_2 && now < vask_3)
{
textView.setText("1");
}
else if(now > vask_3 && now < vask_4)
{
textView.setText("2");
}
else if(now > vask_4 && now < vask_5)
{
textView.setText("3");
}
}
}
有人告诉我,我可以使用onresume重新加载当前时间来更新文本视图中的文本。但是,我不知道如何在文件中使用它。你有什么建议吗?
解决方案
结束后 }
你的 onCreate
方法,添加此:
@Override
protected void onResume(){
super.onResume();
// code to update the date here
}
您还必须移动您的声明 TextView
外面 onCreate
方法,或者至少您可能想要。为此,请在此之前添加这样的行 onCreate
方法:
private TextView textView;
然后在你的 onCreate
您只需要这个:
textView = (TextView) findViewById(R.id.TextView01);
那么您可以访问 textView
从你的 onResume
方法也是如此。
希望有帮助。
不隶属于 StackOverflow