java - 使用原始类中的自定义 Android AnalogClock 设置时间

Question

我想使用互联网上提供的 Android 开源项目的 AnalogClock 源代码来制作自定义 AnalogClock 类。

我想让时钟设置我想要的时间，而不是当前时间。我没有找到关于如何执行此操作的明确示例，因此也许这篇文章会很有用。将源代码复制到新文件后，出现一些错误。下面是AnalogClock的原始源代码:

/*
 * Copyright (C) 2006 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package android.widget;

import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.content.BroadcastReceiver;
import android.content.res.Resources;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.drawable.Drawable;
import android.os.Handler;
import android.text.format.Time;
import android.util.AttributeSet;
import android.view.View;
import android.widget.RemoteViews.RemoteView;

import java.util.TimeZone;

/**
 * This widget display an analogic clock with two hands for hours and
 * minutes.
 */
@RemoteView
public class AnalogClock extends View {
    private Time mCalendar;

    private Drawable mHourHand;
    private Drawable mMinuteHand;
    private Drawable mDial;

    private int mDialWidth;
    private int mDialHeight;

    private boolean mAttached;

    private final Handler mHandler = new Handler();
    private float mMinutes;
    private float mHour;
    private boolean mChanged;

    public AnalogClock(Context context) {
        this(context, null);
    }

    public AnalogClock(Context context, AttributeSet attrs) {
        this(context, attrs, 0);
    }

!!错误 mContext -> 将 mContext 更改为上下文(我可以这样做吗)？

    public AnalogClock(Context context, AttributeSet attrs,
                       int defStyle) {
        super(context, attrs, defStyle);
        Resources r = mContext.getResources();

!!错误 com.android.internal.R 无法解决。我找到了解决这个问题的方法

mDial = r.getDrawable(Resources.getSystem().getIdentifier("clock_dial","drawable", "android"));

对于其他行来说也是如此，只是更改名称以及可绘制或可样式。

vvvv----但是我对下面的代码仍然有问题。

        TypedArray a =
                context.obtainStyledAttributes(
                        attrs, com.android.internal.R.styleable.AnalogClock, defStyle, 0);

^^^^----我不知道如何更改它并使其发挥作用

        mDial = a.getDrawable(com.android.internal.R.styleable.AnalogClock_dial);
        if (mDial == null) {
            mDial = r.getDrawable(com.android.internal.R.drawable.clock_dial);
        }

        mHourHand = a.getDrawable(com.android.internal.R.styleable.AnalogClock_hand_hour);
        if (mHourHand == null) {
            mHourHand = r.getDrawable(com.android.internal.R.drawable.clock_hand_hour);
        }

        mMinuteHand = a.getDrawable(com.android.internal.R.styleable.AnalogClock_hand_minute);
        if (mMinuteHand == null) {
            mMinuteHand = r.getDrawable(com.android.internal.R.drawable.clock_hand_minute);
        }

        mCalendar = new Time();

        mDialWidth = mDial.getIntrinsicWidth();
        mDialHeight = mDial.getIntrinsicHeight();
    }

    @Override
    protected void onAttachedToWindow() {
        super.onAttachedToWindow();

        if (!mAttached) {
            mAttached = true;
            IntentFilter filter = new IntentFilter();

            filter.addAction(Intent.ACTION_TIME_TICK);
            filter.addAction(Intent.ACTION_TIME_CHANGED);
            filter.addAction(Intent.ACTION_TIMEZONE_CHANGED);

            getContext().registerReceiver(mIntentReceiver, filter, null, mHandler);
        }

        // NOTE: It's safe to do these after registering the receiver since the receiver always runs
        // in the main thread, therefore the receiver can't run before this method returns.

        // The time zone may have changed while the receiver wasn't registered, so update the Time
        mCalendar = new Time();

        // Make sure we update to the current time
        onTimeChanged();
    }

    @Override
    protected void onDetachedFromWindow() {
        super.onDetachedFromWindow();
        if (mAttached) {
            getContext().unregisterReceiver(mIntentReceiver);
            mAttached = false;
        }
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {

        int widthMode = MeasureSpec.getMode(widthMeasureSpec);
        int widthSize =  MeasureSpec.getSize(widthMeasureSpec);
        int heightMode = MeasureSpec.getMode(heightMeasureSpec);
        int heightSize =  MeasureSpec.getSize(heightMeasureSpec);

        float hScale = 1.0f;
        float vScale = 1.0f;

        if (widthMode != MeasureSpec.UNSPECIFIED && widthSize < mDialWidth) {
            hScale = (float) widthSize / (float) mDialWidth;
        }

        if (heightMode != MeasureSpec.UNSPECIFIED && heightSize < mDialHeight) {
            vScale = (float )heightSize / (float) mDialHeight;
        }

        float scale = Math.min(hScale, vScale);

        setMeasuredDimension(resolveSize((int) (mDialWidth * scale), widthMeasureSpec),
                resolveSize((int) (mDialHeight * scale), heightMeasureSpec));
    }

    @Override
    protected void onSizeChanged(int w, int h, int oldw, int oldh) {
        super.onSizeChanged(w, h, oldw, oldh);
        mChanged = true;
    }

    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);

        boolean changed = mChanged;
        if (changed) {
            mChanged = false;
        }

!!!错误 - mRight、mLeft、mBotton、mTop 从哪里来？此文件中未声明

        int availableWidth = mRight - mLeft;
        int availableHeight = mBottom - mTop;

        int x = availableWidth / 2;
        int y = availableHeight / 2;

        final Drawable dial = mDial;
        int w = dial.getIntrinsicWidth();
        int h = dial.getIntrinsicHeight();

        boolean scaled = false;

        if (availableWidth < w || availableHeight < h) {
            scaled = true;
            float scale = Math.min((float) availableWidth / (float) w,
                                   (float) availableHeight / (float) h);
            canvas.save();
            canvas.scale(scale, scale, x, y);
        }

        if (changed) {
            dial.setBounds(x - (w / 2), y - (h / 2), x + (w / 2), y + (h / 2));
        }
        dial.draw(canvas);

        canvas.save();
        canvas.rotate(mHour / 12.0f * 360.0f, x, y);
        final Drawable hourHand = mHourHand;
        if (changed) {
            w = hourHand.getIntrinsicWidth();
            h = hourHand.getIntrinsicHeight();
            hourHand.setBounds(x - (w / 2), y - (h / 2), x + (w / 2), y + (h / 2));
        }
        hourHand.draw(canvas);
        canvas.restore();

        canvas.save();
        canvas.rotate(mMinutes / 60.0f * 360.0f, x, y);

        final Drawable minuteHand = mMinuteHand;
        if (changed) {
            w = minuteHand.getIntrinsicWidth();
            h = minuteHand.getIntrinsicHeight();
            minuteHand.setBounds(x - (w / 2), y - (h / 2), x + (w / 2), y + (h / 2));
        }
        minuteHand.draw(canvas);
        canvas.restore();

        if (scaled) {
            canvas.restore();
        }
    }

    private void onTimeChanged() {
        mCalendar.setToNow();

        int hour = mCalendar.hour;
        int minute = mCalendar.minute;
        int second = mCalendar.second;

        mMinutes = minute + second / 60.0f;
        mHour = hour + mMinutes / 60.0f;
        mChanged = true;
    }

    private final BroadcastReceiver mIntentReceiver = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {
            if (intent.getAction().equals(Intent.ACTION_TIMEZONE_CHANGED)) {
                String tz = intent.getStringExtra("time-zone");
                mCalendar = new Time(TimeZone.getTimeZone(tz).getID());
            }

            onTimeChanged();

            invalidate();
        }
    };
}

谁能告诉我:

1. 我怎样才能让这个类像普通的 AnalogClock 一样工作
2. 如何在此类中编写一个方法来应用我为其提供的时间？

Answer 1

使用 setTime() 方法使用自定义 MyAnalogClock。

经过一番努力，终于解决了这个问题。我希望它对某人有用。您只需调用setTime(小时、分钟、秒)方法即可设置时间。

import android.content.Context;
import android.content.res.Resources;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.drawable.Drawable;
import android.text.format.Time;
import android.util.AttributeSet;
import android.view.View;
import android.widget.RemoteViews.RemoteView;

/**
 * This widget display an analogic clock with two hands for hours and
 * minutes.
 */
@RemoteView
public class MyAnalogClock extends View {

    private Drawable mHourHand;
    private Drawable mMinuteHand;
    private Drawable mSecondHand;
    private Drawable mDial;

    private int mDialWidth;
    private int mDialHeight;

    private float mSeconds;
    private float mMinutes;
    private float mHour;

    Context mContext;

    public MyAnalogClock(Context context) {
        super(context);
    }

    public MyAnalogClock(Context context, AttributeSet attrs) {
        this(context, attrs, 0);
    }

    public MyAnalogClock(Context context, AttributeSet attrs,
                       int defStyle) {
        super(context, attrs, defStyle);
        Resources r = context.getResources();
        TypedArray a =
                context.obtainStyledAttributes(
                        attrs, R.styleable.AnalogClock, defStyle, 0);
        mContext=context;
       // mDial = a.getDrawable(com.android.internal.R.styleable.AnalogClock_dial);
       // if (mDial == null) {
            mDial = r.getDrawable(R.drawable.clock_dial);
       // }

      //  mHourHand = a.getDrawable(com.android.internal.R.styleable.AnalogClock_hand_hour);
      //  if (mHourHand == null) {
            mHourHand = r.getDrawable(R.drawable.clock_hour);
      //  }

     //   mMinuteHand = a.getDrawable(com.android.internal.R.styleable.AnalogClock_hand_minute);
     //   if (mMinuteHand == null) {
            mMinuteHand = r.getDrawable(R.drawable.clock_minute);
            mSecondHand = r.getDrawable(R.drawable.clockgoog_minute);
     //   }

        mDialWidth = mDial.getIntrinsicWidth();
        mDialHeight = mDial.getIntrinsicHeight();
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {

        int widthMode = MeasureSpec.getMode(widthMeasureSpec);
        int widthSize =  MeasureSpec.getSize(widthMeasureSpec);
        int heightMode = MeasureSpec.getMode(heightMeasureSpec);
        int heightSize =  MeasureSpec.getSize(heightMeasureSpec);

        float hScale = 1.0f;
        float vScale = 1.0f;

        if (widthMode != MeasureSpec.UNSPECIFIED && widthSize < mDialWidth) {
            hScale = (float) widthSize / (float) mDialWidth;
        }

        if (heightMode != MeasureSpec.UNSPECIFIED && heightSize < mDialHeight) {
            vScale = (float )heightSize / (float) mDialHeight;
        }

        float scale = Math.min(hScale, vScale);

        setMeasuredDimension(resolveSize((int) (mDialWidth * scale), widthMeasureSpec),
                resolveSize((int) (mDialHeight * scale), heightMeasureSpec));
    }

    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);

        //Here you can set the size of your clock
        int availableWidth = 70;
        int availableHeight = 70;

        //Actual size
        int x = availableWidth / 2;
        int y = availableHeight / 2;

        final Drawable dial = mDial;
        int w = dial.getIntrinsicWidth();
        int h = dial.getIntrinsicHeight();

        boolean scaled = false;

        if (availableWidth < w || availableHeight < h) {
            scaled = true;
            float scale = Math.min((float) availableWidth / (float) w,
                                   (float) availableHeight / (float) h);
            canvas.save();
            canvas.scale(scale, scale, x, y);
        }

        dial.setBounds(x - (w / 2), y - (h / 2), x + (w / 2), y + (h / 2));
        dial.draw(canvas);

        canvas.save();
        canvas.rotate(mHour / 12.0f * 360.0f, x, y);
        w = mHourHand.getIntrinsicWidth();
        h = mHourHand.getIntrinsicHeight();
        mHourHand.setBounds(x - (w / 2), y - (h / 2), x + (w / 2), y + (h / 2));
        mHourHand.draw(canvas);
        canvas.restore();

        canvas.save();
        canvas.rotate(mMinutes / 60.0f * 360.0f, x, y);
        w = mMinuteHand.getIntrinsicWidth();
        h = mMinuteHand.getIntrinsicHeight();
        mMinuteHand.setBounds(x - (w / 2), y - (h / 2), x + (w / 2), y + (h / 2));
        mMinuteHand.draw(canvas);
        canvas.restore();

        canvas.save();
        canvas.rotate(mSeconds, x, y);
        w = mSecondHand.getIntrinsicWidth();
        h = mSecondHand.getIntrinsicHeight();
        mSecondHand.setBounds(x - (w / 2), y - (h / 2), x + (w / 2), y + (h / 2));
        mSecondHand.draw(canvas);
        canvas.restore();
        if (scaled) {
            canvas.restore();
        }
    }

    public void setTime(int hours, int minutes, int seconds)
    {
        mSeconds = 6.0f*seconds;
        mMinutes = minutes + seconds / 60.0f;
        mHour = hours + mMinutes / 60.0f;
    }
}

您还应该将 4 个可绘制文件放入可绘制文件夹中，并使用以下代码在值文件夹中创建(或更新)attrs 文件:

<?xml version="1.0" encoding="UTF-8"?>
<resources>
    <declare-styleable name="AnalogClock">
        <attr name="dial" format="reference"/>
        <attr name="hand_hour" format="reference"/>
        <attr name="hand_minute" format="reference"/>
    </declare-styleable>
    </resources>