Android自定义双向进度条的实现代码

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, attrs, 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;    //绘制是否可操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, top, (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), mThumbMarginTop, (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, mTextViewMarginTop, 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点进行操作   * @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();  }}

<util.SeekRangeBar  android:id="@+id/doubleSeekbar"  android:layout_width="match_parent"  android:layout_height="wrap_content"  android:layout_centerVertical="true"/>

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 progressLow, double progressHigh) {    Log.d("LOGCAT","低：" + progressLow + "高：" + progressHigh);  }});