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最近完成了一個高仿的QQ音樂播放器，其中我實現了常駐底部欄，里面的播放按鈕的實現方式在這里總結回顧一下。

這里寫圖片描述

可以看到這里的播放按鈕如下

這里寫圖片描述

拿到這個問題先對要實現的需求進行分析：
1.圓形進度條

2.播放控制

知道了需求，我想到的實現方式有兩種：
第一種，圓形進度條用自定義View繪制實現，然后整體用幀布局FrameLayout，在圓形進度條組件上方放一個ImageView的播放按鈕。
第二種，自定義ViewGroup，整體封裝成一個組件。

思考之后，兩種都可以實現，但是第一種相對來說有點像偷懶實現的方式，再加上這個是常駐底部欄，在很多地方都要用到，所以第一種不太適合，再加上自定義ViewGroup一直是一個難點，總要學習，所以這次我選擇了用第二種實現封裝。

現在來說一下實現思路：

這里寫圖片描述

這里可以看到我的實現思路，前面那個ViewPager在前一篇博客已經講過了，這次這個的實現思路很簡單：圓形進度條用自定義View，在用自定義ViewGroup將圓形進度條和一個控制播放的ImageView組合起來，最后因為要用到控制等事件響應，所以肯定要用到接口回調。

難點：
1.圓形進度條的自定義View的繪制。
2.自定義ViewGroup的實現步驟，怎么實現讓ImageView在圓形進度條的正中心（onLayout的計算）。
3.接口回調。

一、圓形進度條的自定義View的繪制。
這個我是參考慕課網的一節課（Android-打造炫酷進度條），網址http://www.imooc.com/learn/657 ，其中有講怎么繪制圓形進度條，這里說一下他的實現思路：
1、重寫onMeasure方法，其中要注意的就是三種不同的測量模式（UNSPECIFIED,AT_MOST,EXACTILY），這是自定義View經常要考慮的東西，不同的模式，長寬的計算方式是不一樣的。
2.重寫onDraw方法，向用畫筆Paint繪制一個圓（淺顏色的圓），在用Paint繪制一個圓弧（深顏色的圓弧）和圓重疊，當做進度條，這里有一個重點就是Android中默認繪制圓弧是從3點鐘方向開始繪制，但是我們的需求肯定是從0點鐘方向開始繪制，所以要倒退90度。

canvas.drawArc(new RectF(0,0,mRdius*2-mReachHeight/2,mRdius*2-mReachHeight/2),-90,sweepAngle,false,mPaint);

這句話就實現了，其中-90就是從3點鐘方向倒退到0點鐘方向開始繪制。

圓形進度條的代碼如下：
RoundProgressBarWithProgress.java

package com.project.musicplayer.customview;

import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.RectF;
import android.util.AttributeSet;

import com.project.musicplayer.R;

/**
 * Created by Administrator on 2016/7/4.
 */
public class RoundProgressBarWithProgress extends  HorizontalProgressbarWithProgress {
    private int mRdius = dp2px(30);

    private int MaxPaintWidth;

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

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

    public RoundProgressBarWithProgress(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        mReachHeight = (int) (mUnReachHeight*1.5f);
        TypedArray ta = context.obtainStyledAttributes(attrs, R.styleable.RoundProgressBarWithProgress);
        mRdius = (int) ta.getDimension(R.styleable.RoundProgressBarWithProgress_radius,mRdius);

        ta.recycle();
        mPaint.setStyle(Paint.Style.STROKE);
        mPaint.setAntiAlias(true);
        mPaint.setDither(true);
        mPaint.setStrokeCap(Paint.Cap.ROUND);
    }

    @Override
    protected synchronized void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        MaxPaintWidth = Math.max(mReachHeight,mUnReachHeight);
        int expect = mRdius*2 + MaxPaintWidth + getPaddingLeft() + getPaddingRight();

        int width = resolveSize(expect,widthMeasureSpec);
        int height = resolveSize(expect,heightMeasureSpec);
        int realWidth = Math.min(width,height);
        mRdius = (realWidth - getPaddingLeft() - getPaddingRight() - MaxPaintWidth)/2;
        setMeasuredDimension(realWidth,realWidth);
    }

    @Override
    protected synchronized void onDraw(Canvas canvas) {
        String text = getProgress() + "%";
        float textWidth = mPaint.measureText(text);
        float textHeight = (mPaint.descent()+mPaint.ascent())/2;
        canvas.save();

        canvas.translate(getPaddingLeft() + MaxPaintWidth / 2, getPaddingTop() + MaxPaintWidth / 2);
        mPaint.setStyle(Paint.Style.STROKE);
        //drawunReachbar
        mPaint.setColor(mUnReachColor);
        mPaint.setStrokeWidth(mUnReachHeight);
        canvas.drawCircle(mRdius, mRdius, mRdius, mPaint);
        //draw reach bar
        mPaint.setColor(mReachColor);
        mPaint.setStrokeWidth(mReachHeight);
        float sweepAngle = getProgress()*1.0f/getMax()*360;
        canvas.drawArc(new RectF(0,0,mRdius*2-mReachHeight/2,mRdius*2-mReachHeight/2),-90,sweepAngle,false,mPaint);
       /* //draw text
        mPaint.setColor(mTextColor);
        mPaint.setStyle(Paint.Style.FILL);
        canvas.drawText(text,mRdius - textWidth/2,mRdius - textHeight,mPaint);*/

        canvas.restore();;

    }
}

HorizontalProgressbarWithProgress.java

package com.project.musicplayer.customview;

import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.util.AttributeSet;
import android.util.TypedValue;
import android.widget.ProgressBar;

import com.project.musicplayer.R;

import java.lang.reflect.Type;

/**
 * Created by Administrator on 2016/7/4.
 */
public class HorizontalProgressbarWithProgress extends ProgressBar {
    private static final int DEFAULT_TEXT_SIZE = 10;//sp
    private static final int DEFAULT_TEXT_COLOR = 0xFFFC00D1;
    private static final int DEFAULT_COLOR_UNREACH = 0xFFD3D6DA;
    private static final int DEFAULT_HEIGHT_UNREACH = 2;//dp
    private static final int DEFAULT_COLOR_REACH = DEFAULT_TEXT_COLOR;
    private static final int DEFAULT_HEIGHT_REACH = 2;
    private static final int DEFAULT_TEXT_OFFSET = 10;

    protected int mTextSize = sp2px(DEFAULT_TEXT_SIZE);
    protected int mTextColor = DEFAULT_TEXT_COLOR;
    protected int mUnReachColor = DEFAULT_COLOR_UNREACH;
    protected int mUnReachHeight = dp2px(DEFAULT_HEIGHT_UNREACH);
    protected int mReachColor = DEFAULT_COLOR_REACH;
    protected int mReachHeight = dp2px(DEFAULT_HEIGHT_REACH);
    protected int mTextOffset = dp2px(DEFAULT_TEXT_OFFSET);

    protected Paint mPaint = new Paint();
    private int mRealWidth;

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

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

    }

    public HorizontalProgressbarWithProgress(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        obtainStyledAttrs(attrs);
    }

    @Override
    protected synchronized void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
        //int widthMode = MeasureSpec.getMode(widthMeasureSpec);
        int widthVal = MeasureSpec.getSize(widthMeasureSpec);
        int height = measureHeight(heightMeasureSpec);
        setMeasuredDimension(widthVal,height);

        mRealWidth = getMeasuredWidth() - getPaddingLeft() - getPaddingRight();
    }

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

        //draw reachbar
        canvas.translate(getPaddingLeft(),getHeight()/2);

        boolean noNeedUnReach = false;
        float radio = getProgress()*1.0f/getMax();

        String  text = getProgress() + "%";
        int textWidth = (int) mPaint.measureText(text);
        float progressX = radio*mRealWidth;
        if(progressX + textWidth > mRealWidth){
            progressX = mRealWidth - textWidth;
            noNeedUnReach = true;
        }

        float endX = progressX - mTextOffset/2;
        if(endX > 0){
            mPaint.setColor(mReachColor);
            mPaint.setStrokeWidth(mReachHeight);
            canvas.drawLine(0,0,endX,0,mPaint);
        }
        //draw text
        mPaint.setColor(mTextColor);
        int y = (int) (-(mPaint.descent()+mPaint.ascent())/2);
        canvas.drawText(text,progressX,y,mPaint);

        //draw unreachbar
        if(!noNeedUnReach){
            float start  = progressX + mTextOffset/2 + textWidth;
            mPaint.setColor(mUnReachColor);
            mPaint.setStrokeWidth(mUnReachHeight);
            canvas.drawLine(start,0,mRealWidth,0,mPaint);
        }

        canvas.restore();
    }

    private int measureHeight(int heightMeasureSpec) {
        int result = 0;
        int mode = MeasureSpec.getMode(heightMeasureSpec);
        int size = MeasureSpec.getSize(heightMeasureSpec);
        if(mode == MeasureSpec.EXACTLY){
            result = size;
        }else{
            int textHeight = (int) (mPaint.descent() - mPaint.ascent());
            result = getPaddingTop() + getPaddingBottom() + Math.max(Math.max(mReachHeight,mUnReachHeight), textHeight);
            if(mode == MeasureSpec.AT_MOST){
                result = Math.min(result,size);
            }
        }
        return result;
    }

    //獲取自定義屬性
    private void obtainStyledAttrs(AttributeSet attrs) {
        TypedArray ta = getContext().obtainStyledAttributes(attrs, R.styleable.HorizontalProgressbarWithProgress);

        mTextSize = (int) ta.getDimension(R.styleable.HorizontalProgressbarWithProgress_progress_text_size, mTextSize);
        mTextColor = ta.getColor(R.styleable.HorizontalProgressbarWithProgress_progress_text_color, mTextColor);
        mTextOffset = (int) ta.getDimension(R.styleable.HorizontalProgressbarWithProgress_progress_text_offset, mTextOffset);

        mUnReachColor = ta.getColor(R.styleable.HorizontalProgressbarWithProgress_progress_unreach_color, mUnReachColor);
        mUnReachHeight = (int) ta.getDimension(R.styleable.HorizontalProgressbarWithProgress_progress_unreach_height, mUnReachHeight);

        mReachColor = ta.getColor(R.styleable.HorizontalProgressbarWithProgress_progress_reach_color, mReachColor);
        mReachHeight = (int) ta.getDimension(R.styleable.HorizontalProgressbarWithProgress_progress_reach_height, mReachHeight);

        ta.recycle();

        mPaint.setTextSize(mTextSize);
    }

    protected int dp2px(int dpVal) {
        return (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, dpVal
                , getResources().getDisplayMetrics());
    }

    protected int sp2px(int spVal) {
        return (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_SP, spVal
                , getResources().getDisplayMetrics());
    }
}

attrs.xml

<resources>
<declare-styleable name="HorizontalProgressbarWithProgress">
        <attr name="progress_unreach_color"  format="color"/>
        <attr name="progress_unreach_height"  format="dimension"/>
        <attr name="progress_reach_color"  format="color"/>
        <attr name="progress_reach_height"  format="dimension"/>
        <attr name="progress_text_color"  format="color"/>
        <attr name="progress_text_size"  format="dimension"/>
        <attr name="progress_text_offset"  format="dimension"/>
    </declare-styleable>
    <declare-styleable name="RoundProgressBarWithProgress">
        <attr name="radius"  format="dimension"/>
    </declare-styleable>
</resources>

二、自定義ViewGroup。
1.重寫onMeasure
2.重寫onLayout
3.接口回調
這里說一下難點，難點就是在onLayout中需要通過計算將ImageView居中，看似簡單但是怎么都無法正居中，最后慢慢調整才能夠實現。
其他的都是自定義ViewGroup的常規實現方式，這里就不講了，上代碼：
PlayButton.java

package com.project.musicplayer.customview;

import android.content.Context;
import android.util.AttributeSet;
import android.util.Log;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;

import com.project.musicplayer.R;

/**
 * Created by Administrator on 2016/7/4.
 */
public class PlayButton extends ViewGroup implements View.OnClickListener {
    private RoundProgressBarWithProgress RProgressBar;
    private ImageView Btn;

    private boolean isPlaying = false;

    private onPlayClickListener listener;


    public void setOnPlayListener(onPlayClickListener listener) {
        this.listener = listener;
    }

    public int getProgressMAX() {
        return RProgressBar.getMax();
    }


    public interface onPlayClickListener{
        void onClick(View v);
    }

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

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

    public PlayButton(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        int count = getChildCount();
        for(int i = 0;i<count;i++){
            measureChild(getChildAt(i),widthMeasureSpec,heightMeasureSpec);
        }
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
    }

    @Override
    protected void onLayout(boolean changed, int l, int t, int r, int b) {
        if(changed){
            layoutProgress();
            layoutBtn();
        }
    }

    //定位btn的位置
    private void layoutBtn() {
        Btn = (ImageView) getChildAt(1);
        Btn.setOnClickListener(this);
        int l = 0;
        int t = 0;
        int width = Btn.getMeasuredWidth();
        int height = Btn.getMeasuredHeight();
        Log.i("MeasureWidth",getMeasuredWidth()+"");
        Log.i("ProGressMeasureWidth",RProgressBar.getMeasuredWidth()+"");
        Log.i("padding",getPaddingLeft()+"");

        l = (int) (RProgressBar.getMeasuredWidth()/2.0f-width/2.0f);
        t = (int) (RProgressBar.getMeasuredHeight()/2.0f-height/2.0f+getPaddingTop());
        Btn.layout(l,t,l+width,l+height);
    }

    //定位progressbar的位置
    private void layoutProgress() {
        RProgressBar = (RoundProgressBarWithProgress) getChildAt(0);
        int l = 0;
        int t = 0;
        int width = RProgressBar.getMeasuredWidth();
        int height = RProgressBar.getMeasuredHeight();

        l = l + getPaddingLeft();
        t = t + getPaddingTop();
        RProgressBar.layout(l,t,l+width-getPaddingRight(),t+height-getPaddingBottom());
    }

    @Override
    public void onClick(View v) {
        Btn = (ImageView) findViewById(R.id.iv_id_play);
        if(isPlaying){
            isPlaying = false;
            Btn.setImageResource(R.mipmap.play);
        }else{
            isPlaying = true;
            Btn.setImageResource(R.mipmap.stop);
        }
        if(listener != null){
            listener.onClick(Btn);
        }
    }

    /**
     * 設置播放狀態
     */
    public void setPlayingStatus(){
        isPlaying = true;
        Btn.setImageResource(R.mipmap.stop);
    }
    /**
     * 設置暫停狀態
     */
    public void setPauseStatus(){
        isPlaying = false;
        Btn.setImageResource(R.mipmap.play);
    }
    /**
     * 設置播放進度
     */
    public void setProgress(int progress){
        RProgressBar.setProgress(progress);
    }
    /**
     * 獲取播放進度
     */
    public int getProgress(){
        return RProgressBar.getProgress();
    }
    /**
     * 設置進度max
     */
    public void setProgressMAX(int max){
        RProgressBar.setMax(max);
    }

}

三、最后一個難點，接口回調，另用一篇博客來講吧，這次算是真正理解了接口回調的實現方式。

三个男躁一个女,国精产品一区一手机的秘密,麦子交换系列最经典十句话,欧美国产综合欧美视频

仿QQ音樂常駐底部欄播放按鈕效果

仿QQ音樂常駐底部欄播放按鈕效果

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三个男躁一个女,国精产品一区一手机的秘密,麦子交换系列最经典十句话,欧美 国产 综合 欧美 视频

仿QQ音樂常駐底部欄播放按鈕效果

推薦閱讀更多精彩內容

三个男躁一个女,国精产品一区一手机的秘密,麦子交换系列最经典十句话,欧美国产综合欧美视频