Question

我想得到当前时间并将其与我提供的时间范围进行比较例如，如果当前时间是在上午6:00到11:59之间，我想设置早安的问候语消息

以下是我的Android应用程序的一些代码

import java.text.DateFormat; 
import java.text.SimpleDateFormat; 
import java.util.Calendar; 
import java.util.Date; 
import java.util.TimeZone;

public class MainActivity extends Activity implements View.OnClickListener {

    protected Calendar firstBound;
    protected Calendar secondBound;
    protected static Calendar cal;
    protected static String timeString = null;
    protected static String greetString = null;
    protected static DateFormat date;
    Button greetButton;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        // get a reference to the greetButton on the UI
        greetButton = (Button) findViewById(R.id.greetButton);
        cal = Calendar.getInstance(TimeZone.getDefault());

        Date currentLocalTime = cal.getTime();
        date = new SimpleDateFormat("HH:mm");
        timeString = date.format(currentLocalTime);
        char h1 = timeString.charAt(0);
        char h2 = timeString.charAt(1);
        char m1 = timeString.charAt(3);
        char m2 = timeString.charAt(4);
        cal.set(Calendar.HOUR,Character.getNumericValue(h1) + Character.getNumericValue(h2));
        cal.set(Calendar.MINUTE,Character.getNumericValue(m1) + Character.getNumericValue(m2));
        // Set the onClickListener for the greetButton to be this class.
        // This requires that the class implement the View.OnClickListener callback
        // the onClick() method
        greetButton.setOnClickListener(this);
    }

我的On Click方法是

public void onClick(View v) {       
    TextView textMessage = (TextView) findViewById(R.id.textMessage);
    EditText editFriendName = (EditText) findViewById(R.id.editFriendName);       
    String friendName = editFriendName.getText().toString();
    switch (v.getId()) {
        case R.id.greetButton:
            // set the string being displayed by the TextView to the greeting
            if(cal.after(setFirstBoundLimits(14, 00)) && cal.before(setSecondBoundLimits(18, 00))){
                Toast.makeText(MainActivity.this, timeString, Toast.LENGTH_LONG).show();
            }
            // message for the friend
            //textMessage.setText(getString(R.string.greetstring) + friendName + "!");
        break;
        default:
        break;
    }
}
private Calendar setFirstBoundLimits(int hh, int mm){
    firstBound = Calendar.getInstance();
    firstBound.set(Calendar.HOUR, hh);
    firstBound.set(Calendar.MINUTE, mm);
    return firstBound;
}

Answer 1

Period and Duration

Smart Hello

Showing Morning, afternoon, evening, night message based on Time in java

Difference in days between two dates in Java?

Answer 2

****谢谢......这段代码真的对我有用

 protected String getCurrentTimeMessage(){
    //Date date = new Date();
    Calendar cal = Calendar.getInstance();
    //cal.setTime(date);
    int hours = cal.get(Calendar.HOUR_OF_DAY);
    if(hours>=6 && hours<=11){
      //Toast.makeText(this, "Good Morning" + hours, Toast.LENGTH_SHORT).show();
        return "Good Morning";
    }else if(hours>=12 && hours<=16){
        // Toast.makeText(this, "Good Afternoon"+ hours, Toast.LENGTH_SHORT).show();
        return "Good Afternoon";
    }else if(hours>=17 && hours<=20){
        // Toast.makeText(this, "Good Evening"+ hours, Toast.LENGTH_SHORT).show();
        return "Good Evening";
    }else if(hours>=21 && hours<=23){
      //  Toast.makeText(this, "Good Night"+ hours, Toast.LENGTH_SHORT).show();
        return "Good Night";
    }
    else if(hours >=0 && hours <= 5){
        return "Good Night";
    }

    return null;
}

当前时间和范围

2 个答案: