Android自定义双向进度条的实现代码

概述想整个双向的进度条，就是可以选取播放范围的。像这样：然而官方控件里只有单向的。不要慌，我们自己画一个。

想整个双向的进度条，就是可以选取播放范围的。

像这样：

然而官方控件里只有单向的。不要慌，我们自己画一个。

绘制一个进度条主要是三方面。1.样式，2.尺寸，3. *** 作监听。

完整代码来一遍:

注释基本上就把原理说明了一下。

package util;import androID.content.Context;import androID.graphics.Canvas;import androID.graphics.color;import androID.graphics.Paint;import androID.graphics.drawable.Drawable;import androID.support.v4.content.ContextCompat;import androID.util.AttributeSet;import androID.util.Log;import androID.vIEw.MotionEvent;import androID.vIEw.VIEw;import com.example.qzd.utildemo.R;import java.math.BigDecimal;/** * 双向滑块的进度条（区域选择） */public class SeekRangebar extends VIEw {  private Context _context;  private static final int CliCK_ON_LOW = 1;    //手指在前滑块上滑动  private static final int CliCK_ON_HIGH = 2;    //手指在后滑块上滑动  private static final int CliCK_IN_LOW_AREA = 3;  //手指点击离前滑块近  private static final int CliCK_IN_HIGH_AREA = 4; //手指点击离后滑块近  private static final int CliCK_OUT_AREA = 5;   //手指点击在vIEw外  private static final int CliCK_INVAILD = 0;  private static final int[] STATE_norMAL = {};  private static final int[] STATE_pressed = {androID.R.attr.state_pressed,androID.R.attr.state_window_focused,};  private static int mThumbmargintop = 0;  //滑动块顶部离vIEw顶部的距离  private static int mTextVIEwmargintop = 0;  //当前滑块文字距离vIEw顶部距离  private Drawable hasScrollbarBg;    //滑动条滑动后背景图  private Drawable notScrollbarBg;    //滑动条未滑动背景图  private Drawable mThumbLow;     //前滑块  private Drawable mThumbHigh;    //后滑块  private int mScollbarWIDth;   //控件宽度 = 滑动条宽度 + 滑动块宽度  private int mScollbarHeight;  //控件高度  private int mThumbWIDth;    //滑动块直径  private double mOffsetLow = 0;   //前滑块中心坐标  private double mOffsetHigh = 0;  //后滑块中心坐标  private int mdistance=0;   //总刻度是固定距离 两边各去掉半个滑块距离  private int mFlag = CliCK_INVAILD;  //手指按下的类型  private double defaultScreenLow = 0;  //默认前滑块位置百分比  private double defaultScreenHigh = 100; //默认后滑块位置百分比  private OnSeekbarchangelistener mbarchangelistener;  private boolean editable=false;//是否处于可编辑状态  private int miniGap=5;//AB的最小间隔  private double progressLow;//起点(百分比)  private double progressHigh;//终点  public SeekRangebar(Context context) {    this(context,null);  }  public SeekRangebar(Context context,AttributeSet attrs) {    this(context,attrs,0);  }  public SeekRangebar(Context context,AttributeSet attrs,int defStyle) {    super(context,defStyle);    _context=context;    //这里设置背景图及滑块图，自定义过进度条的同学应该很熟悉了    notScrollbarBg = ContextCompat.getDrawable(_context,R.mipmap.hp_wbf);    hasScrollbarBg = ContextCompat.getDrawable(_context,R.mipmap.hp_ybf);    mThumbLow = ContextCompat.getDrawable(_context,R.mipmap.hp_a);    mThumbHigh = ContextCompat.getDrawable(_context,R.mipmap.hp_b);    mThumbLow.setState(STATE_norMAL);    mThumbHigh.setState(STATE_norMAL);    //设置滑动条高度    mScollbarHeight = notScrollbarBg.getIntrinsicHeight();    //设置滑动块直径    mThumbWIDth = mThumbLow.getIntrinsicWIDth();  }  /**   * 测量vIEw尺寸（在onDraw()之前）   * @param wIDthMeasureSpec   * @param heightmeasureSpec   */  protected voID onMeasure(int wIDthMeasureSpec,int heightmeasureSpec) {    int wIDth = MeasureSpec.getSize(wIDthMeasureSpec);    mScollbarWIDth = wIDth;    if(mdistance==0) {//这里滑块中心坐标初始化的时候测量一下（根据mdistance是否赋值判断），并不需要不停地去测量。后面会根据进度计算滑块位置。      mOffsetLow = mThumbWIDth / 2;      mOffsetHigh = wIDth - mThumbWIDth / 2;    }    mdistance = wIDth - mThumbWIDth;    if(defaultScreenLow != 0) {      mOffsetLow = formatInt(defaultScreenLow / 100 * (mdistance)) + mThumbWIDth / 2;    }    if(defaultScreenHigh != 100) {      mOffsetHigh = formatInt(defaultScreenHigh / 100 * (mdistance)) + mThumbWIDth / 2;    }    setMeasuredDimension(wIDth,mThumbWIDth + mThumbmargintop + 2);  }  protected voID onLayout(boolean changed,int l,int t,int r,int b) {    super.onLayout(changed,l,t,r,b);  }  /**   * 绘制进度条   */  protected voID onDraw(Canvas canvas) {    super.onDraw(canvas);    //设置绘制样式    Paint text_Paint = new Paint();    text_Paint.setTextAlign(Paint.Align.CENTER);    text_Paint.setcolor(color.RED);    text_Paint.setTextSize(20);    int top = mThumbmargintop + mThumbWIDth / 2 - mScollbarHeight / 2;    int bottom = top + mScollbarHeight;    //绘制是否可 *** 作状态的下的不同样式，仅可编辑状态下显示进度条    if(editable) {      //白色滑动条，两个滑块各两边部分      notScrollbarBg.setBounds(mThumbWIDth / 2,top,mScollbarWIDth - mThumbWIDth / 2,bottom);      notScrollbarBg.draw(canvas);      //红色滑动条，两个滑块中间部分      hasScrollbarBg.setBounds((int) mOffsetLow,(int) mOffsetHigh,bottom);      hasScrollbarBg.draw(canvas);    }    //前滑块    mThumbLow.setBounds((int) (mOffsetLow - mThumbWIDth / 2),mThumbmargintop,(int) (mOffsetLow + mThumbWIDth / 2),mThumbWIDth + mThumbmargintop);    mThumbLow.draw(canvas);    //后滑块    mThumbHigh.setBounds((int) (mOffsetHigh - mThumbWIDth / 2),(int) (mOffsetHigh + mThumbWIDth / 2),mThumbWIDth + mThumbmargintop);    mThumbHigh.draw(canvas);    //当前滑块刻度    progressLow = formatInt((mOffsetLow - mThumbWIDth / 2) * 100 / mdistance);    progressHigh = formatInt((mOffsetHigh - mThumbWIDth / 2) * 100 / mdistance);    canvas.drawText((int) progressLow + "",(int) mOffsetLow - 2 - 2,mTextVIEwmargintop,text_Paint);    canvas.drawText((int) progressHigh + "",(int) mOffsetHigh - 2,text_Paint);    if (mbarchangelistener != null) {      mbarchangelistener.onProgressChanged(this,progressLow,progressHigh);    }  }  //手势监听  @OverrIDe  public boolean ontouchEvent(MotionEvent e) {    if(!editable) {      return false;    }    if (e.getAction() == MotionEvent.ACTION_DOWN) {      mFlag = getAreaFlag(e);      if (mFlag == CliCK_ON_LOW) {        mThumbLow.setState(STATE_pressed);      } else if (mFlag == CliCK_ON_HIGH) {        mThumbHigh.setState(STATE_pressed);      } else if (mFlag == CliCK_IN_LOW_AREA) {        mThumbLow.setState(STATE_pressed);        mThumbHigh.setState(STATE_norMAL);        //如果点击0-mThumbWIDth/2坐标        if (e.getX() < 0 || e.getX() <= mThumbWIDth / 2) {          mOffsetLow = mThumbWIDth / 2;        } else if (e.getX() > mScollbarWIDth - mThumbWIDth / 2) {          mOffsetLow = mThumbWIDth / 2 + mdistance;        } else {          mOffsetLow = formatInt(e.getX());        }      } else if (mFlag == CliCK_IN_HIGH_AREA) {        mThumbHigh.setState(STATE_pressed);        mThumbLow.setState(STATE_norMAL);        if (e.getX() >= mScollbarWIDth - mThumbWIDth / 2) {          mOffsetHigh = mdistance + mThumbWIDth / 2;        } else {          mOffsetHigh = formatInt(e.getX());        }      }      //更新滑块      invalIDate();    } else if (e.getAction() == MotionEvent.ACTION_MOVE) {      if (mFlag == CliCK_ON_LOW) {        if (e.getX() < 0 || e.getX() <= mThumbWIDth / 2) {          mOffsetLow = mThumbWIDth / 2;        } else if (e.getX() >= mScollbarWIDth - mThumbWIDth / 2) {          mOffsetLow = mThumbWIDth / 2 + mdistance;          mOffsetHigh = mOffsetLow;        } else {          mOffsetLow = formatInt(e.getX());          if (mOffsetHigh - mOffsetLow <= 0) {            mOffsetHigh = (mOffsetLow <= mdistance + mThumbWIDth / 2) ? (mOffsetLow) : (mdistance + mThumbWIDth / 2);          }        }      } else if (mFlag == CliCK_ON_HIGH) {        if (e.getX() < mThumbWIDth / 2) {          mOffsetHigh = mThumbWIDth / 2;          mOffsetLow = mThumbWIDth / 2;        } else if (e.getX() > mScollbarWIDth - mThumbWIDth / 2) {          mOffsetHigh = mThumbWIDth / 2 + mdistance;        } else {          mOffsetHigh = formatInt(e.getX());          if (mOffsetHigh - mOffsetLow <= 0) {            mOffsetLow = (mOffsetHigh >= mThumbWIDth / 2) ? (mOffsetHigh) : mThumbWIDth / 2;          }        }      }      //更新滑块，每次滑块有动作都要执行此函数触发onDraw方法绘制新图片      invalIDate();    } else if (e.getAction() == MotionEvent.ACTION_UP) {      Log.d("LOGCAT","ACTION UP:"+progressHigh+"-"+progressLow);      mThumbLow.setState(STATE_norMAL);      mThumbHigh.setState(STATE_norMAL);      if(miniGap>0 && progressHigh<progressLow+miniGap){        progressHigh=progressLow+miniGap;        this.defaultScreenHigh = progressHigh;        mOffsetHigh = formatInt(progressHigh / 100 * (mdistance)) + mThumbWIDth / 2;        invalIDate();      }    }    return true;  }  /**   * 设置是否可编辑状态，非可编辑状态将不能对AB点进行 *** 作   * @param _b   */  public voID setEditable(boolean _b){    editable=_b;    invalIDate();  }  /**   * 获取当前手指位置   */  public int getAreaFlag(MotionEvent e) {    int top = mThumbmargintop;    int bottom = mThumbWIDth + mThumbmargintop;    if (e.getY() >= top && e.getY() <= bottom && e.getX() >= (mOffsetLow - mThumbWIDth / 2) && e.getX() <= mOffsetLow + mThumbWIDth / 2) {      return CliCK_ON_LOW;    } else if (e.getY() >= top && e.getY() <= bottom && e.getX() >= (mOffsetHigh - mThumbWIDth / 2) && e.getX() <= (mOffsetHigh + mThumbWIDth / 2)) {      return CliCK_ON_HIGH;    } else if (e.getY() >= top      && e.getY() <= bottom      && ((e.getX() >= 0 && e.getX() < (mOffsetLow - mThumbWIDth / 2)) || ((e.getX() > (mOffsetLow + mThumbWIDth / 2))      && e.getX() <= ((double) mOffsetHigh + mOffsetLow) / 2))) {      return CliCK_IN_LOW_AREA;    } else if (e.getY() >= top && e.getY() <= bottom && (((e.getX() > ((double) mOffsetHigh + mOffsetLow) / 2) && e.getX() < (mOffsetHigh - mThumbWIDth / 2)) || (e.getX() > (mOffsetHigh + mThumbWIDth / 2) && e.getX() <= mScollbarWIDth))) {      return CliCK_IN_HIGH_AREA;    } else if (!(e.getX() >= 0 && e.getX() <= mScollbarWIDth && e.getY() >= top && e.getY() <= bottom)) {      return CliCK_OUT_AREA;    } else {      return CliCK_INVAILD;    }  }  /**   * 设置前滑块位置   * @param progressLow   */  public voID setProgressLow(double progressLow) {    this.defaultScreenLow = progressLow;    mOffsetLow = formatInt(progressLow / 100 * (mdistance)) + mThumbWIDth / 2;    invalIDate();  }  /**   * 设置后滑块位置   * @param progressHigh   */  public voID setProgressHigh(double progressHigh) {    this.defaultScreenHigh = progressHigh;    mOffsetHigh = formatInt(progressHigh / 100 * (mdistance)) + mThumbWIDth / 2;    invalIDate();  }  /**   * 设置滑动监听   * @param mListener   */  public voID setonSeekbarchangelistener(OnSeekbarchangelistener mListener) {    this.mbarchangelistener = mListener;  }  /**   * 滑动监听，改变输入框的值   */  public interface OnSeekbarchangelistener {    //滑动时    public voID onProgressChanged(SeekRangebar seekbar,double progressLow,double progressHigh);  }  /**   * 设置滑动结果为整数   */  private int formatInt(double value) {    BigDecimal bd = new BigDecimal(value);    BigDecimal bd1 = bd.setScale(0,BigDecimal.ROUND_HALF_UP);    return bd1.intValue();  }}

然后就可以在程序中使用了。

布局中

<util.SeekRangebar  androID:ID="@+ID/doubleSeekbar"  androID:layout_wIDth="match_parent"  androID:layout_height="wrap_content"  androID:layout_centerVertical="true"/>

调用

private SeekRangebar doubleSeekbar;//双向进度条doubleSeekbar = (SeekRangebar) findVIEwByID(R.ID.doubleSeekbar);//监听进度范围变化doubleSeekbar.setonSeekbarchangelistener(new SeekRangebar.OnSeekbarchangelistener() {  @OverrIDe  public voID onProgressChanged(SeekRangebar seekbar,double progressHigh) {    Log.d("LOGCAT","低：" + progressLow + "高：" + progressHigh);  }});

相关GitHub项目地址：https://github.com/codeqian/android-class-lib

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