android 自定义图片圆形进度条

感觉话一个圆形进度条挺简单的 ，但是却偏偏给了几张图片让你话，说实话我没接触过，感觉好难，还好百度有大把的资源，一番努力下终于画出来了。 代码如下。

package com.etong.cpms.widget;
import java.net.Proxy.Type;

import com.etong.cpms.activity.R;

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.graphics.Paint.Align;
import android.graphics.PorterDuff;
import android.graphics.PorterDuffXfermode;
import android.graphics.Rect;
import android.graphics.RectF;
import android.graphics.Paint.FontMetricsInt;
import android.graphics.Typeface;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;

/**
 *
 */
public class MyView extends View {
    private Bitmap bmpBg;
    private Bitmap bmpForbg;
    private Bitmap bmpDb;
    private Bitmap bmpNq;
    private PorterDuffXfermode mMode;
    private Paint mXferPaint;
    private RectF mOval;
    private int mPercent;

private Paint paint;
    private Rect targetRect;
    private FontMetricsInt fontMetrics;

/**
     *
     *
     * @param context
     */
    public MyView(Context context) {
        super(context);
    }

int widthPixels;
    int heightPixels;
    int centerX;
    int centerY;

@Override
    protected void onSizeChanged(int w, int h, int oldw, int oldh) {
        super.onSizeChanged(w, h, oldw, oldh);
        widthPixels = w;
        heightPixels = h;
        centerX = widthPixels / 2;
        centerY = heightPixels / 2;
    }

public MyView(Context context, AttributeSet attrs) {
        super(context, attrs);
        setFocusable(true);

// setFocusableInTouchMode(true);
        bmpBg = (Bitmap) BitmapFactory.decodeResource(getResources(),
                R.drawable.wq);
        bmpForbg = (Bitmap) BitmapFactory.decodeResource(getResources(),
                R.drawable.mdwq);
        bmpDb = (Bitmap) BitmapFactory.decodeResource(getResources(),
                R.drawable.db);
        bmpNq = (Bitmap) BitmapFactory.decodeResource(getResources(), R.drawable.nq);

mMode = new PorterDuffXfermode(PorterDuff.Mode.SRC_IN);//锟斤拷锟斤拷
        mXferPaint = new Paint();
        mXferPaint.setXfermode(mMode);//锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷图片锟洁交时模式
        mOval = new RectF();
        mOval.left = 0;
        mOval.top = 0;

mPercent = 0;
        paint = new Paint();
        paint.setColor(Color.GREEN);
        paint.setTypeface(Typeface.DEFAULT_BOLD);
        paint.setTextSize(60);
        targetRect = new Rect(centerX - bmpBg.getWidth() / 2, centerY - bmpBg.getHeight() / 2, centerX + bmpBg.getWidth() / 2,
                centerY + bmpBg.getWidth() / 2);
        fontMetrics = paint.getFontMetricsInt();
    }

/**
     *
     */

@Override
    protected void onDraw(Canvas canvas) {
        mXferPaint.setXfermode(null);
        canvas.drawBitmap(bmpBg, centerX - bmpBg.getWidth() / 2, centerY - bmpBg.getHeight() / 2, mXferPaint);
        int saveCount = canvas.saveLayer(centerX - bmpBg.getWidth() / 2, centerY - bmpBg.getHeight() / 2,centerX + bmpBg.getWidth() / 2,
                centerY + bmpBg.getWidth() / 2, null, Canvas.MATRIX_SAVE_FLAG
                        | Canvas.CLIP_SAVE_FLAG
                        | Canvas.HAS_ALPHA_LAYER_SAVE_FLAG
                        | Canvas.FULL_COLOR_LAYER_SAVE_FLAG
                        | Canvas.CLIP_TO_LAYER_SAVE_FLAG);

//        mOval.left = 100;
//        mOval.top = 100;
//        mOval.right = 100 + bmpBg.getWidth();
//        mOval.bottom = 100 + bmpBg.getHeight();
        mOval.left = centerX - bmpBg.getWidth() / 2;
        mOval.top = centerY - bmpBg.getHeight() / 2;
        mOval.right = centerX + bmpBg.getWidth() / 2;
        mOval.bottom = centerY + bmpBg.getWidth() / 2;
        mXferPaint.setXfermode(null);
        canvas.drawArc(mOval, -90, 360 * mPercent / 100, true, mXferPaint);

mXferPaint.setXfermode(mMode);
//        canvas.drawBitmap(bmpForbg, 100, 100, mXferPaint);
        canvas.drawBitmap(bmpForbg, centerX - bmpForbg.getWidth() / 2, centerY - bmpForbg.getHeight() / 2, mXferPaint);
        canvas.restoreToCount(saveCount);

int baseline = targetRect.top
                + (targetRect.bottom - targetRect.top - fontMetrics.bottom + fontMetrics.top)
                / 2 - fontMetrics.top;

//
        paint.setTextAlign(Align.CENTER);
        paint.setTextAlign(Align.CENTER);
        canvas.drawBitmap(bmpNq, centerX - bmpNq.getWidth() / 2, centerY - bmpNq.getHeight() / 2, paint);
        canvas.drawText(mPercent + "%", centerX, centerY+80, paint);
        canvas.drawBitmap(bmpDb, centerX - bmpDb.getWidth() / 2, centerY - bmpDb.getHeight() / 2-50, paint);
    }

@Override
    public boolean onTouchEvent(MotionEvent event) {

mPercent++;
        mPercent %= 100;

//
        invalidate();
        // postInvalidate();
        return true;
    }
}