java - Android:DigitalClock 删除秒数

Question

我使用这段代码为我的应用程序添加了一个时钟:

  <DigitalClock 
android:id="@+id/digitalclock"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:textSize = "30sp"
/>

问题是它还显示秒..有一种简单快速的方法来隐藏那些吗？我只需要 hh:mm 格式的小时和分钟，而不是 hh:mm:ss!有什么建议么？谢谢!

Answer 1

找到答案 here ，对于其他寻找有效答案的人，这里是:

1. 从 android 源克隆/复制 DigitalClock.java

2. 更改新 CustomDigitalClock 中的格式字符串

   package com.example;
   
   import android.content.Context;
   import android.content.res.Resources;
   import android.database.ContentObserver;
   import android.os.Handler;
   import android.os.SystemClock;
   import android.provider.Settings;
   import android.text.format.DateFormat;
   import android.util.AttributeSet;
   import android.widget.TextView;
   
   import java.util.Calendar;
   
   /**
    * You have to make a clone of the file DigitalClock.java to use in your application, modify in the following manner:-
    *      private final static String m12 = "h:mm aa";
    *      private final static String m24 = "k:mm";
    */
   
   public class CustomDigitalClock extends TextView {
   
       Calendar mCalendar;
       private final static String m12 = "h:mm aa";
       private final static String m24 = "k:mm";
       private FormatChangeObserver mFormatChangeObserver;
   
       private Runnable mTicker;
       private Handler mHandler;
   
       private boolean mTickerStopped = false;
   
       String mFormat;
   
       public CustomDigitalClock(Context context) {
           super(context);
           initClock(context);
       }
   
       public CustomDigitalClock(Context context, AttributeSet attrs) {
           super(context, attrs);
           initClock(context);
       }
   
       private void initClock(Context context) {
           Resources r = context.getResources();
   
           if (mCalendar == null) {
               mCalendar = Calendar.getInstance();
           }
   
           mFormatChangeObserver = new FormatChangeObserver();
           getContext().getContentResolver().registerContentObserver(
                   Settings.System.CONTENT_URI, true, mFormatChangeObserver);
   
           setFormat();
       }
   
       @Override
       protected void onAttachedToWindow() {
           mTickerStopped = false;
           super.onAttachedToWindow();
           mHandler = new Handler();
   
           /**
            * requests a tick on the next hard-second boundary
            */
           mTicker = new Runnable() {
                   public void run() {
                       if (mTickerStopped) return;
                       mCalendar.setTimeInMillis(System.currentTimeMillis());
                       setText(DateFormat.format(mFormat, mCalendar));
                       invalidate();
                       long now = SystemClock.uptimeMillis();
                       long next = now + (1000 - now % 1000);
                       mHandler.postAtTime(mTicker, next);
                   }
               };
           mTicker.run();
       }
   
       @Override
       protected void onDetachedFromWindow() {
           super.onDetachedFromWindow();
           mTickerStopped = true;
       }
   
       /**
        * Pulls 12/24 mode from system settings
        */
       private boolean get24HourMode() {
           return android.text.format.DateFormat.is24HourFormat(getContext());
       }
   
       private void setFormat() {
           if (get24HourMode()) {
               mFormat = m24;
           } else {
               mFormat = m12;
           }
       }
   
       private class FormatChangeObserver extends ContentObserver {
           public FormatChangeObserver() {
               super(new Handler());
           }
   
           @Override
           public void onChange(boolean selfChange) {
               setFormat();
           }
       }
   
   }
   

3. 在布局 xml 中引用自定义类

   <com.example.CustomDigitalClock
       android:id="@+id/fragment_clock_digital"
       android:layout_width="wrap_content"
       android:layout_height="wrap_content"
       android:text="DigitalClock" />
   

4. 在 Activity/fragment 中加载 CustomDigitalClock

   CustomDigitalClock dc = (CustomDigitalClock)
   mFragmentView.findViewById(R.id.fragment_clock_digital);