Android中怎么自定义双向进度条
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本篇文章给大家分享的是有关Android中怎么自定义双向进度条,小编觉得挺实用的,因此分享给大家学习,希望大家阅读完这篇文章后可以有所收获,话不多说,跟着小编一起来看看吧。
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;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(); } 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); } 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; } public void setEditable(boolean _b){ editable=_b; invalidate(); } 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; } } public void setProgressLow(double progressLow) { this.defaultScreenLow = progressLow; mOffsetLow = formatInt(progressLow / 100 * (mDistance)) + mThumbWidth / 2; invalidate(); } public void setProgressHigh(double progressHigh) { this.defaultScreenHigh = progressHigh; mOffsetHigh = formatInt(progressHigh / 100 * (mDistance)) + mThumbWidth / 2; invalidate(); } public void setOnSeekBarChangeListener(OnSeekBarChangeListener mListener) { this.mBarChangeListener = mListener; } public interface OnSeekBarChangeListener { //滑动时 public void onProgressChanged(SeekRangeBar seekBar, double progressLow, double progressHigh); } 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 progressLow, double progressHigh) { Log.d("LOGCAT","低:" + progressLow + "高:" + progressHigh); }});
以上就是Android中怎么自定义双向进度条,小编相信有部分知识点可能是我们日常工作会见到或用到的。希望你能通过这篇文章学到更多知识。更多详情敬请关注编程网行业资讯频道。
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