自定义刻度的SeekBar

<com.imibaby.client.views.CustomSeekbar  
android:id="@+id/myCustomSeekBar"  
android:layout_width="wrap_content"  
android:layout_height="wrap_content"  
android:layout_marginLeft="14.33dp"  
android:layout_marginRight="10.33dp" />

private ArrayList<String> volume_sections = new ArrayList<String>();   
volume_sections.add("静音");  
volume_sections.add("低");  
volume_sections.add("中");  
volume_sections.add("高");  
customSeekBar.initData(volume_sections);              
customSeekBar.setProgress(int level);     
customSeekBar.setResponseOnTouch(this);//activity实现了下面的接口ResponseOnTouch，每次touch会回调onTouchResponse  
  
public interface ResponseOnTouch {  
    public void onTouchResponse(int volume);  
}</

  
import android.content.Context;  
import android.graphics.Bitmap;  
import android.graphics.BitmapFactory;  
import android.graphics.Canvas;  
import android.graphics.Color;  
import android.graphics.Paint;  
import android.util.AttributeSet;  
import android.util.TypedValue;  
import android.view.MotionEvent;  
import android.view.View;  
  
import com.imibaby.client.R;  
import com.imibaby.client.interfaces.ResponseOnTouch;  
  
import java.util.ArrayList;  
  
  
public class CustomSeekbar extends View {  
    private final String TAG = "CustomSeekbar";  
    private int width;  
    private int height;  
    private int downX = 0;  
    private int downY = 0;  
    private int upX = 0;  
    private int upY = 0;  
    private int moveX = 0;  
    private int moveY = 0;  
    private float scale = 0;  
    private int perWidth = 0;  
    private Paint mPaint;  
    private Paint mTextPaint;  
    private Paint buttonPaint;  
    private Canvas canvas;  
    private Bitmap bitmap;  
    private Bitmap thumb;  
    private Bitmap spot;  
    private Bitmap spot_on;  
    private int hotarea = 100;//点击的热区  
    private int cur_sections = 2;  
    private ResponseOnTouch responseOnTouch;  
    private int bitMapHeight = 38;//第一个点的起始位置起始，图片的长宽是76，所以取一半的距离  
    private int textMove = 60;//字与下方点的距离，因为字体字体是40px，再加上10的间隔  
    private int[] colors = new int[]{0xffdf5600,0x33000000};//进度条的橙色,进度条的灰色,字体的灰色  
    private int textSize;  
    private int circleRadius;  
    private ArrayList<String> section_title;  
    public CustomSeekbar(Context context) {  
        super(context);  
    }  
    public CustomSeekbar(Context context, AttributeSet attrs) {  
        this(context, attrs, 0);  
    }  
    public CustomSeekbar(Context context, AttributeSet attrs, int defStyleAttr) {  
        super(context, attrs, defStyleAttr);  
        cur_sections = 0;  
        bitmap = Bitmap.createBitmap(900, 900, Bitmap.Config.ARGB_8888);  
        canvas = new Canvas();  
        canvas.setBitmap(bitmap);  
        thumb = BitmapFactory.decodeResource(getResources(), R.drawable.set_button_0);  
        spot = BitmapFactory.decodeResource(getResources(),R.drawable.spot);  
        spot_on = BitmapFactory.decodeResource(getResources(),R.drawable.spot_on);  
        bitMapHeight = thumb.getHeight()/2;  
        textMove = bitMapHeight+22;  
        textSize = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_SP, 12, getResources().getDisplayMetrics());  
        circleRadius = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 3, getResources().getDisplayMetrics());  
        mPaint = new Paint(Paint.DITHER_FLAG);  
        mPaint.setAntiAlias(true);//锯齿不显示  
        mPaint.setStrokeWidth(3);  
        mTextPaint = new Paint(Paint.DITHER_FLAG);  
        mTextPaint.setAntiAlias(true);  
        mTextPaint.setTextSize(textSize);  
        mTextPaint.setColor(0xffb5b5b4);  
        buttonPaint = new Paint(Paint.DITHER_FLAG);  
        buttonPaint.setAntiAlias(true);  
        //initData(null);  
    }  
    /** 
     * 实例化后调用，设置bar的段数和文字 
     */  
    public void initData(ArrayList<String> section){  
        if(section != null){  
            section_title = section;  
        }else {  
            String[] str = new String[]{"低", "中", "高"};  
            section_title = new ArrayList<String>();  
            for (int i = 0; i < str.length; i++) {  
                section_title.add(str[i]);  
            }  
        }  
    }  
  
    @Override  
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {  
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);  
  
        int widthMode = MeasureSpec.getMode(widthMeasureSpec);  
        int widthSize = MeasureSpec.getSize(widthMeasureSpec);  
        int heightMode = MeasureSpec.getMode(heightMeasureSpec);  
        int heightSize = MeasureSpec.getSize(heightMeasureSpec);  
  
        width = widthSize;  
        float scaleX = widthSize / 1080;  
        float scaleY = heightSize / 1920;  
        scale = Math.max(scaleX,scaleY);  
        //控件的高度  
        //        height = 185;  
        height = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 62, getResources().getDisplayMetrics());  
        setMeasuredDimension(width, height);  
        width = width-bitMapHeight/2;  
        perWidth = (width - section_title.size()*spot.getWidth() - thumb.getWidth()/2) / (section_title.size()-1);  
        hotarea = perWidth/2;  
    }  
  
    @Override  
    protected void onDraw(Canvas canvas) {  
        super.onDraw(canvas);  
        mPaint.setColor(Color.WHITE);  
        mPaint.setStyle(Paint.Style.FILL);  
        mPaint.setAlpha(0);  
        canvas.drawRect(0, 0, getMeasuredWidth(), getMeasuredHeight(), mPaint);  
        canvas.drawBitmap(bitmap, 0, 0, null);  
        mPaint.setAlpha(255);  
        mPaint.setColor(colors[1]);  
        canvas.drawLine(bitMapHeight, height * 2 / 3, width - bitMapHeight - spot_on.getWidth() / 2, height * 2 / 3, mPaint);  
        int section = 0;  
        while(section < section_title.size()){  
            if(section < cur_sections) {  
                mPaint.setColor(colors[0]);  
                canvas.drawLine(thumb.getWidth()/2 + section * perWidth + (section+1) * spot_on.getWidth(),height * 2 / 3,  
                        thumb.getWidth()/2 + section * perWidth + (section+1) * spot_on.getWidth() + perWidth,height * 2 / 3,mPaint);  
                canvas.drawBitmap(spot_on, thumb.getWidth()/2 + section * perWidth + section * spot_on.getWidth(),height * 2 / 3 - spot_on.getHeight()/2,mPaint);  
            }else{  
                mPaint.setAlpha(255);  
                if(section == section_title.size()-1){  
                    canvas.drawBitmap(spot,  width - spot_on.getWidth() - bitMapHeight/2, height * 2 / 3 - spot.getHeight() / 2, mPaint);  
                }else {  
                    canvas.drawBitmap(spot, thumb.getWidth()/2 + section * perWidth + section * spot_on.getWidth(), height * 2 / 3 - spot.getHeight() / 2, mPaint);  
                }  
            }  
  
            if(section == section_title.size()-1) {  
                canvas.drawText(section_title.get(section), width - spot_on.getWidth()- bitMapHeight/4 - textSize / 2, height * 2 / 3 - textMove, mTextPaint);  
            }else{  
                canvas.drawText(section_title.get(section), thumb.getWidth()/2 + section * perWidth + section * spot_on.getWidth(), height * 2 / 3 - textMove, mTextPaint);  
            }  
            section++;  
        }  
        if(cur_sections == section_title.size()-1){  
            canvas.drawBitmap(thumb, width - spot_on.getWidth() - bitMapHeight/2 - thumb.getWidth() / 2,  
                    height * 2 / 3 - bitMapHeight, buttonPaint);  
        }else {  
            canvas.drawBitmap(thumb, thumb.getWidth()/2 + cur_sections * perWidth + cur_sections * spot_on.getWidth() - thumb.getWidth()/4 ,  
                    height * 2 / 3 - bitMapHeight, buttonPaint);  
        }  
    }  
  
    @Override  
    public boolean onTouchEvent(MotionEvent event) {  
        super.onTouchEvent(event);  
        switch (event.getAction()) {  
            case MotionEvent.ACTION_DOWN:  
                thumb = BitmapFactory.decodeResource(getResources(), R.drawable.set_button_1);  
                downX = (int) event.getX();  
                downY = (int) event.getY();  
                responseTouch(downX, downY);  
                break;  
            case MotionEvent.ACTION_MOVE:  
                thumb = BitmapFactory.decodeResource(getResources(), R.drawable.set_button_1);  
                moveX = (int) event.getX();  
                moveY = (int) event.getY();  
                responseTouch(moveX, moveY);  
                break;  
            case MotionEvent.ACTION_UP:  
                thumb = BitmapFactory.decodeResource(getResources(), R.drawable.set_button_0);  
                upX = (int) event.getX();  
                upY = (int) event.getY();  
                responseTouch(upX, upY);  
                responseOnTouch.onTouchResponse(cur_sections);  
                break;  
        }  
        return true;  
    }  
    private void responseTouch(int x, int y){  
        if(x <= width-bitMapHeight/2) {  
            cur_sections = (x + perWidth / 3) / perWidth;  
        }else{  
            cur_sections = section_title.size()-1;  
        }  
        invalidate();  
    }  
  
    //设置监听  
    public void setResponseOnTouch(ResponseOnTouch response){  
        responseOnTouch = response;  
    }  
  
    //设置进度  
    public void setProgress(int progress){  
        cur_sections = progress;  
        invalidate();  
    }  
}