高仿手机QQ音乐之——Android带进度条的开关

最新版的手机QQ音乐体验确实不错，发现首页播放按钮能够显示歌曲当前进度条。认为挺有新意。效果例如以下：

自己琢磨了下。能够用自己定义组件来实现，试着做了一下。效果例如以下：

整理了下思路。大概设计流程是这种：
首先，要实现音乐的关停，第一首选就是toggleButton 能够方便的控制，因此组件继承自toggleButton然后我们依据toggleButton的 isChecked的状态来 重写onDraw()方法,来绘制我们所需求的形态：

左边的就是按钮的暂停状态，右边就是播放状态，最后在外围画一个圆标示播放的整体进度，画一段圆弧(圆弧宽度要比外围的圆宽，才干看到效果)标示当前进度，至此。构思完毕，開始写代码！
首先，此组件应该有这样三个属性： 主体颜色。第一进度条宽度。总进度条宽度。我们先在新建一个项目 在项目res文件夹下的values文件夹中建一个 attrs.xml文件 在里面写入我们的view属性：
attrs.xml:

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <declare-styleable name="ProgressToggleButton">
        <attr name="progress_total_width" format="dimension" />
        <attr name="progress_current_width" format="dimension" />
        <attr name="main_color" format="color" />
    </declare-styleable>

</resources>

然后我们在src文件夹下的包中建一个ProgressToggleButton 继承自ToggleButton 并在构造方法中获得我们自己定义的属性：

public class ProgressToggleButton extends ToggleButton {
    public ProgressToggleButton(Context context) {
        super(context);
    }
    private int mainColor;//主体颜色

    private int circleTotalWidth, circleCurrentWidth;//总进度和当前进度的宽度

    public ProgressToggleButton(Context context, AttributeSet attrs) {
        super(context, attrs);
        TypedArray arry = context.obtainStyledAttributes(attrs,
                R.styleable.ProgressToggleButton);
        mainColor = arry.getColor(R.styleable.ProgressToggleButton_main_color,
                getResources().getColor(R.color.main_color));//前面值就是xml文件指定的值，后者就是前者未指定的默认值
        circleTotalWidth = (int) arry.getDimension(
                R.styleable.ProgressToggleButton_progress_total_width,
                getResources().getDimension(R.dimen.progress_total_width));
        circleCurrentWidth = (int) arry.getDimension(
                R.styleable.ProgressToggleButton_progress_current_width,
                getResources().getDimension(R.dimen.progress_current_width));
        arry.recycle();//一定要让recycle 否则会出问题
    }
}

然后再重写onDraw()方法绘出自己要的属性：

@Override
    protected void onDraw(Canvas canvas) {
        mPaint.setColor(mainColor);
        mPaint.setAntiAlias(true);
        mPaint.setStrokeWidth(0);
        int center = getWidth() / 2;// 三角形,圆圈中央
        int sideLength = center / 5 * 4; // 三角形边长
        if (this.isChecked()) {
            drawPlay(canvas, center, sideLength);//绘制两条竖线
        } else {
            drawStop(canvas, center, sideLength);//绘制正三角形
        }
        // 最外围的总进度
        mPaint.setStrokeWidth(circleTotalWidth);
        mPaint.setStyle(Paint.Style.STROKE);
        int radius = center - circleTotalWidth;
        canvas.drawCircle(center, center, radius, mPaint);
        // 最当前进度
        RectF oval = new RectF(center - radius + circleTotalWidth, center
                - radius + circleTotalWidth,
                center + radius - circleTotalWidth, center + radius
                        - circleTotalWidth);
        mPaint.setStrokeWidth(circleCurrentWidth);
        canvas.drawArc(oval, -90, mProgress, false, mPaint);//mProgress指圆弧的度数，这里就代表了我们的进度
    }

这里的drawPlay方法没有给出。等等在具体代码中展示。以下是监听，
为了方便我们使用，我们又一次写一个接口，在我们使用的时候回调：

public interface onCheckChangesListener {

        void onchechkchanges(boolean isChecked);
    }

    private onCheckChangesListener listener;

    /**
     * 监听
     * 
     * @param l
     */
    public void setOnCheckChangesListener(onCheckChangesListener l) {
        this.listener = l;
    }

在构造方法中调用自带的OnCheckChangeLister:

this.setOnCheckedChangeListener(new OnCheckedChangeListener() {

            @Override
            public void onCheckedChanged(CompoundButton buttonView,
                    boolean isChecked) {
                if (listener != null) {
                    listener.onchechkchanges(isChecked);//调接口中的方法
                }
                postInvalidate();//刷新界面
            }
        });

好了。来看看先阶段的效果：
主布局文件：

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    xmlns:progres="http://schemas.android.com/apk/res/com.example.progrestogglebutton"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >

    <com.example.progrestogglebutton.weight.ProgressToggleButton
        android:id="@+id/user_div"
        android:layout_width="100dp"
        android:layout_height="100dp"
        android:layout_alignParentRight="true"
        android:layout_margin="10dp"
        android:background="@color/transparent_color"
        progres:main_color="#FAA532"
        progres:progress_current_width="5dp"
        progres:progress_total_width="2dp"
        tools:ignore="RtlHardcoded" />

    <com.example.progrestogglebutton.weight.ProgressToggleButton
        android:id="@+id/defult"
        android:layout_width="100dp"
        android:layout_height="100dp"
        android:layout_margin="10dp"
        android:background="@color/transparent_color"
        tools:ignore="RtlHardcoded" />

    <com.example.progrestogglebutton.weight.ProgressToggleButton
        android:id="@+id/play"
        android:layout_width="52dp"
        android:layout_height="52dp"
        android:layout_alignParentBottom="true"
        android:layout_centerHorizontal="true"
        android:layout_margin="10dp"
        android:background="@color/transparent_color"
        tools:ignore="RtlHardcoded" />

    <SeekBar
        android:id="@+id/seekbar"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_above="@+id/play"
        android:max="100"
        android:progress="0" />

</RelativeLayout>

主Activity:

package com.example.progrestogglebutton;

import com.example.progrestogglebutton.weight.ProgressToggleButton;
import com.example.progrestogglebutton.weight.ProgressToggleButton.onCheckChangesListener;

import android.app.Activity;
import android.media.MediaPlayer;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.widget.SeekBar;
import android.widget.SeekBar.OnSeekBarChangeListener;
import android.widget.Toast;

public class MainActivity extends Activity {
    private ProgressToggleButton tDefult, tDiv, tplayer;

    private MediaPlayer mMediaPlayer;

    private SeekBar mSeekBar;

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

    private void init() {
        tDefult = (ProgressToggleButton) findViewById(R.id.defult);
        tDiv = (ProgressToggleButton) findViewById(R.id.user_div);
        tplayer = (ProgressToggleButton) findViewById(R.id.play);
        mSeekBar = (SeekBar) findViewById(R.id.seekbar);
        mMediaPlayer = MediaPlayer.create(MainActivity.this, R.raw.penta_kill);
        tDefult.setOnCheckChangesListener(new onCheckChangesListener() {

            @Override
            public void onchechkchanges(boolean isChecked) {
                Toast.makeText(MainActivity.this, "默认样式被点击,状态为" + isChecked,
                        Toast.LENGTH_SHORT).show();
            }
        });
        tDiv.setOnCheckChangesListener(new onCheckChangesListener() {

            @Override
            public void onchechkchanges(boolean isChecked) {
                Toast.makeText(MainActivity.this, "用户指定样式被点击,状态为" + isChecked,
                        Toast.LENGTH_SHORT).show();
            }
        });
        tplayer.setOnCheckChangesListener(new onCheckChangesListener() {

            @Override
            public void onchechkchanges(boolean isChecked) {
                if (musicAsyTask != null) {
                    musicAsyTask.cancel(true);
                }
                musicAsyTask = (MusicAsyTask) new MusicAsyTask().execute();
                if (isChecked) {
                    mMediaPlayer.start();
                } else {
                    mMediaPlayer.pause();
                }
            }
        });
        mSeekBar.setOnSeekBarChangeListener(new OnSeekBarChangeListener() {

            @Override
            public void onStopTrackingTouch(SeekBar seekBar) {
                musicAsyTask = (MusicAsyTask) new MusicAsyTask().execute();
                Log.d("LOG", "finish");

            }

            @Override
            public void onStartTrackingTouch(SeekBar seekBar) {
                if (musicAsyTask != null) {
                    musicAsyTask.cancel(true);
                    musicAsyTask = null;
                    Log.d("LOG", "starttoch");
                }
            }

            @Override
            public void onProgressChanged(SeekBar seekBar, int progress,
                    boolean fromUser) {
                if (fromUser) {
                    Log.d("LOG", progress + "");
                    mMediaPlayer.seekTo((progress * mMediaPlayer.getDuration()) / 100);
                    tplayer.setProgress(progress);
                }

            }
        });
    }

    private MusicAsyTask musicAsyTask;

    public class MusicAsyTask extends AsyncTask<Void, Integer, Void> {

        @Override
        protected Void doInBackground(Void... params) {
            publishProgress(getPercent(mMediaPlayer.getCurrentPosition(),
                    mMediaPlayer.getDuration()));
            try {
                Thread.sleep(1000);
                this.doInBackground();
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            return null;
        }

        @Override
        protected void onProgressUpdate(Integer... values) {
            int progress = values[0];
            tplayer.setProgress(progress);
            mSeekBar.setProgress(progress);
            super.onProgressUpdate(values);
        }

    }

    /**
     * 计算百分比
     * 
     * @param progress
     *            当前进度
     * @param total
     *            总进度
     * @return
     */
    public int getPercent(int progress, int total) {
        double baiy = progress * 1.0;
        double baiz = total * 1.0;
        double fen = baiy / baiz;
        return (int) (fen * 100);
    }

}

来看看效果：

细节阐述：
1.在xml文件里，每一个ProgressToggleButton，我都将背景指定为全然透明的 颜色，android:background=”@color/transparent_color”,以覆盖系统自带的样式。

2.左边的为默认样式，右边的在布局文件里指定了自己的属性，这里要注意的时。假设你要引入自己定义属性，就一定要在xml中引入xmlns:progres=”http://schemas.android.com/apk/res/com.example.progrestogglebutton” 这是调用了此布局文件的 activity所在的包路径

3.至于设置进度，实现方案就是 在当中加入setProgress()方法，依据设置的值，来确定第二进度的值，在activity中借助 handler+thread 或者 asytask 动态获取 播放媒体时间的进度 动态设置给progressToggleButton就可以！

完整组件代码:

import android.annotation.SuppressLint;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Path;
import android.graphics.RectF;
import android.util.AttributeSet;
import android.widget.CompoundButton;
import android.widget.ToggleButton;

import com.example.progrestogglebutton.R;

@SuppressLint("DrawAllocation")
public class ProgressToggleButton extends ToggleButton {
    public interface onCheckChangesListener {

        void onchechkchanges(boolean isChecked);
    }

    private onCheckChangesListener listener;

    /**
     * 监听
     * 
     * @param l
     */
    public void setOnCheckChangesListener(onCheckChangesListener l) {
        this.listener = l;
    }

    private Paint mPaint;

    private int mainColor;

    private int circleTotalWidth, circleCurrentWidth;

    private int mProgress = 1;// 当前进度

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

    public ProgressToggleButton(Context context, AttributeSet attrs) {
        super(context, attrs);
        mPaint = new Paint();
        TypedArray arry = context.obtainStyledAttributes(attrs,
                R.styleable.ProgressToggleButton);
        mainColor = arry.getColor(R.styleable.ProgressToggleButton_main_color,
                getResources().getColor(R.color.main_color));
        circleTotalWidth = (int) arry.getDimension(
                R.styleable.ProgressToggleButton_progress_total_width,
                getResources().getDimension(R.dimen.progress_total_width));
        circleCurrentWidth = (int) arry.getDimension(
                R.styleable.ProgressToggleButton_progress_current_width,
                getResources().getDimension(R.dimen.progress_current_width));
        arry.recycle();
        this.setOnCheckedChangeListener(new OnCheckedChangeListener() {

            @Override
            public void onCheckedChanged(CompoundButton buttonView,
                    boolean isChecked) {
                if (listener != null) {
                    listener.onchechkchanges(isChecked);
                }
                postInvalidate();
            }
        });
    }

    @Override
    protected void onDraw(Canvas canvas) {
        mPaint.setColor(mainColor);
        mPaint.setAntiAlias(true);
        mPaint.setStrokeWidth(0);
        int center = getWidth() / 2;// 三角形,圆圈中央
        int sideLength = center / 5 * 4; // 三角形边长
        if (this.isChecked()) {
            drawPlay(canvas, center, sideLength);
        } else {
            drawStop(canvas, center, sideLength);
        }
        // 最外围的总进度
        mPaint.setStrokeWidth(circleTotalWidth);
        mPaint.setStyle(Paint.Style.STROKE);
        int radius = center - circleTotalWidth;
        canvas.drawCircle(center, center, radius, mPaint);
        // 最当前进度
        RectF oval = new RectF(center - radius + circleTotalWidth, center
                - radius + circleTotalWidth,
                center + radius - circleTotalWidth, center + radius
                        - circleTotalWidth);
        mPaint.setStrokeWidth(circleCurrentWidth);
        canvas.drawArc(oval, -90, mProgress, false, mPaint);
    }

    /**
     * 画暂停状态
     * 
     * @param canvas
     * @param center
     *            三角形中心横纵坐标
     * @param sideLength
     *            三角形边长
     */
    private void drawStop(Canvas canvas, int center, int sideLength) {
        mPaint.setStyle(Paint.Style.FILL_AND_STROKE);
        float genSan = (float) Math.sqrt(3);
        Path path2 = new Path();
        path2.moveTo((center - sideLength / (2 * genSan)), center - sideLength
                / 2);
        path2.lineTo((center + 2 * sideLength / (2 * genSan)), center);
        path2.lineTo((center - sideLength / (2 * genSan)), center + sideLength
                / 2);
        path2.close();
        canvas.drawPath(path2, mPaint);
    }

    /**
     * 画播放状态
     * 
     * @param canvas
     * @param center
     *            两条线的对称轴中心横纵坐标
     * @param sideLength
     *            线的长度
     */

    private void drawPlay(Canvas canvas, int center, int sideLength) {
        float genSan = (float) Math.sqrt(3);
        float linesWidth = sideLength / 5;
        mPaint.setStrokeWidth(linesWidth);
        canvas.drawLine((center - sideLength / (2 * genSan)) + linesWidth / 2,
                center - sideLength / 2, (center - sideLength / (2 * genSan))
                        + linesWidth / 2, center + sideLength / 2, mPaint);
        canvas.drawLine((center + sideLength / (2 * genSan)) - linesWidth / 2,
                center - sideLength / 2, (center + sideLength / (2 * genSan))
                        - linesWidth / 2, center + sideLength / 2, mPaint);
    }

    /**
     * 设置进度
     * 
     * @param progress
     */

    public void setProgress(int progress) {
        if (progress >= 100) {
            mProgress = 360 ;
        } else {
            mProgress = (int) ((progress + 1) * 3.6);
        }
        postInvalidate();
    }

    public int getProgress() {
        return (int) (mProgress / 3.6);
    }

    // 设置为wrap_content 时的控件高宽
    private int defultWidth = (int) getResources().getDimension(
            R.dimen.weidght_size);

    @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);
        int finalWidth = 0;
        int finaLHeight = 0;
        if (widthMode == MeasureSpec.EXACTLY) {
            finalWidth = widthSize;
        } else {
            finalWidth = (int) (getPaddingLeft() + defultWidth + getPaddingRight());
        }
        if (heightMode == MeasureSpec.EXACTLY) {
            finaLHeight = heightSize;
        } else {
            finaLHeight = (int) (getPaddingTop() + defultWidth + getPaddingBottom());
        }
        setMeasuredDimension(finalWidth, finaLHeight);
    }
}

总结：
1.本人技术有限，又第一次写博客。肯定有非常多纰漏之处，忘广大网友批评斧正，共同进步。
2.本组件事实上挺简单，核心就是自己定义组件，可是在研究过程中，那个画三角形确实花了点时间，要用三角函数来确定坐标，终于还是弄出来了，所以在这里分享出来，分享才是一种快乐。

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