android - 从数字时钟小部件中删除秒和 AM/PM

Question

我想从数字时钟小部件中删除秒和 AM/PM 指示，但我不知道该怎么做。

Answer 1

它在 DigitalClock 类中是硬编码的，因此您不能以编程方式对其进行更改。改变它的唯一方法是重新实现 DigitalClock 小部件。哟可以从这里获取源代码。

您需要将此代码复制到您的项目中，将其重命名为“MyDigitalClock”并将其用作您的小部件。正如您将在实现中看到的那样，您应该关注两个变量以获得您想要的：

private final static String m12 = "h:mm:ss aa";
private final static String m24 = "k:mm:ss";

ss 代表秒，aa 代表上午/下午。

Answer 2

您可以使用 addTextChangedListener()，然后在 afterTextChanged() 中取出秒数和 AM/PM。此示例仅删除秒数：

DigitalClock dc = (DigitalClock) findViewById(R.id.currentTime);
    dc.addTextChangedListener(new TextWatcher() {

        @Override
        public void onTextChanged(CharSequence s, int start, int before, int count) {
        }

        @Override
        public void beforeTextChanged(CharSequence s, int start, int count,
                int after) {
        }

        @Override
        public void afterTextChanged(Editable s) {
            if (s.charAt(4) == ':') {
                s.delete(4, 7);
            } else if (s.charAt(5) == ':') {
                s.delete(5, 8);
            }
        }
    });

Answer 3

让我一点点扩展和刷新Erol的完美答案。

实际上，您需要在项目中添加一个文件并更新 xml 布局。

可以从这里获取示例：/frameworks/base/core/java/android/widget/DigitalClock.java

改编的 DigitalClock.java：

import android.content.Context;
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.text.SimpleDateFormat;
import java.util.Calendar;

/**
 * Like AnalogClock, but digital.  Shows seconds.
 *
 * @deprecated It is recommended you use {@link TextClock} instead.
 */
@Deprecated
public class DigitalClock extends TextView {
    // FIXME: implement separate views for hours/minutes/seconds, so
    // proportional fonts don't shake rendering

    Calendar mCalendar;
    @SuppressWarnings("FieldCanBeLocal") // We must keep a reference to this observer
    private FormatChangeObserver mFormatChangeObserver;

    private Runnable mTicker;
    private Handler mHandler;

    private boolean mTickerStopped = false;

    java.text.DateFormat mFormat;

    public DigitalClock(Context context) {
        super(context);
        initClock();
    }

    public DigitalClock(Context context, AttributeSet attrs) {
        super(context, attrs);
        initClock();
    }

    private void initClock() {
        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));
                setText(mFormat.format(mCalendar.getTime()));
                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;
    }

    private void setFormat() {
//      mFormat = DateFormat.getTimeFormatString(getContext());  //<== ORIGINAL
//        mFormat = DateFormat.getTimeFormat(getContext());      //<== Fixed with PM
//        mFormat = new SimpleDateFormat("hh:mm a");
        mFormat = new SimpleDateFormat("h:mm");                  //<== Your variant
    }

    private class FormatChangeObserver extends ContentObserver {
        public FormatChangeObserver() {
            super(new Handler());
        }

        @Override
        public void onChange(boolean selfChange) {
            setFormat();
        }
    }

    @Override
    public CharSequence getAccessibilityClassName() {
        //noinspection deprecation
        return DigitalClock.class.getName();
    }
}

布局.xml：

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".HomeActivity" >



    <HERE_YOUR_PACKAGE_NAME.DigitalClock
        android:id="@+id/digitalClock"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textColor="@android:color/background_light"
        android:layout_centerInParent="true"
        android:textSize="130dp"/>


</RelativeLayout>

结果：