github上已经有如此多漂亮的progressbar,可还是满足不了美工MM的胃口，无奈只得根据美工的需求，自定义一个符合要求的progrssbar了，美工给的效果图如下：
好看是好看，还要求上面指示器的颜色随着进度去改变，上网找了一番还真没有发现完全符合要求的，只好自己想办法了。
思路：1.肯定的继承View或者progressbar去重写，由于我对progressbar的源码不太熟悉，就继承View开始自定义。继承progressbar一定可以更加轻松的实现，应为基本只需重写onDraw()方法即可。
2.就是重写View的onDraw(), onMeasure(),onDetachedFromWindow(),onTouchEvent()等若干方法。
思路就这么点，下面先看最终效果：
模拟器中的圆角度数有点太园了，用的时候可以调整下。
源码如下：
package com.example.demo;import android.content.Context;import android.content.res.Resources;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Paint;import android.graphics.RectF;import android.util.AttributeSet;import android.util.DisplayMetrics;import android.view.MotionEvent;import android.view.View;import android.view.WindowManager;/*** @author rzq* @function 风险指数标示View**/public class IndiactorView extends View {/*** 公共部分*/private static final int MAX = 100;private static final int ROUND_DEGREE = 8;private static final int[] cursorColors = new int[] { R.color.color_7ea1de,R.color.color_7aa7d6, R.color.color_73adcd, R.color.color_6cb4c4,R.color.color_66bbba, R.color.color_63c6a8, R.color.color_63cd99,R.color.color_6bce90, R.color.color_7dce8a, R.color.color_96cc84,R.color.color_b2c97d, R.color.color_d3c477, R.color.color_e9be72,R.color.color_fab76d, R.color.color_ffae68, R.color.color_ff9c60,R.color.color_f87653, R.color.color_ff8a5a, R.color.color_f0674e,R.color.color_e85548 };private Context mContext;private Resources res;private Paint mPaint;private DisplayMetrics dm;/*** resource*/private Bitmap bitmapProgress;private Bitmap bitmapIndictor;/*** 进度条宽高，坐标*/private float bitmapProgressWidth, bitmapProgressHeight;private float bitmapProgressX, bitmapProgressY;private float bitmapIndictorWidth, bitmapIndictorHeight;/*** 手机屏幕宽高*/private int screenHeight, screenWidth;/*** 指示矩形的宽高*/private int rectWidth;private int rectHeight;/*** 风险指数内容*/private int cursorPosition = 0;private float precent = 0;private String drawText = "0/100";public IndiactorView(Context context, AttributeSet attrs) {super(context, attrs);this.mContext = context;this.res = getResources();initView();}private void initView() {mPaint = new Paint(Paint.ANTI_ALIAS_FLAG);dm = new DisplayMetrics();WindowManager wm = (WindowManager) mContext.getSystemService(Context.WINDOW_SERVICE);wm.getDefaultDisplay().getMetrics(dm);screenWidth = dm.widthPixels;screenHeight = dm.heightPixels;rectWidth = dip2px(47);rectHeight = dip2px(25);bitmapProgress = BitmapFactory.decodeResource(res,R.drawable.icon_indictor);bitmapIndictor = BitmapFactory.decodeResource(res, R.drawable.san_jiao);bitmapProgressWidth = bitmapProgress.getWidth();bitmapProgressHeight = bitmapProgress.getHeight();bitmapIndictorWidth = bitmapIndictor.getWidth();bitmapIndictorHeight = bitmapIndictor.getHeight();bitmapProgressX = (screenWidth - bitmapProgressWidth) / 2;bitmapProgressY = rectHeight + bitmapIndictorHeight;}/*** 更新游标位置* * @param position*/public void setPosition(int position) {cursorPosition = position;precent = (position * bitmapProgressWidth) / MAX;drawText = new StringBuilder().append(position).append("/100").toString();/*** 还要根据position设置paint颜色*/int offset = position / 5;if (offset == 20) {offset = offset - 1;}mPaint.setColor(res.getColor(cursorColors[offset]));invalidate();}@Overrideprotected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {int viewHeight = (int) (bitmapIndictorHeight + bitmapProgressHeight + rectHeight);setMeasuredDimension((int) screenWidth, viewHeight);}@Overridepublic boolean onTouchEvent(MotionEvent event) {return super.onTouchEvent(event);}@Overrideprotected void onDraw(Canvas canvas) {/*** 游标当前X坐标*/float cursorX = (cursorPosition > 0) ? (bitmapProgressX + precent - bitmapIndictorWidth / 2): (bitmapProgressX + precent);canvas.drawBitmap(bitmapProgress, bitmapProgressX, bitmapProgressY,null);canvas.drawBitmap(bitmapIndictor, cursorX, rectHeight, null);/*** 边界判断，防止超出屏幕*/if (cursorX + rectWidth >= screenWidth) {cursorX = cursorX - rectWidth + bitmapIndictorWidth;}RectF rect = new RectF(cursorX, 0, cursorX + rectWidth, rectHeight - 1);canvas.drawRoundRect(rect, ROUND_DEGREE, ROUND_DEGREE, mPaint);mPaint.setColor(Color.WHITE);mPaint.setTextSize(dip2px(11));float cursorTextX = (rectWidth - mPaint.measureText(drawText)) / 2;float cursorTextY = ((rectHeight / 2) - ((mPaint.descent() + mPaint.ascent()) / 2));canvas.drawText(drawText, cursorX + cursorTextX, cursorTextY, mPaint);}/*** 释放资源，竟可能少消耗内存*/@Overrideprotected void onDetachedFromWindow() {mContext = null;res = null;mPaint = null;dm = null;bitmapIndictor = null;bitmapProgress = null;}/*** 根据手机的分辨率从 dp 的单位 转成为 px(像素)*/private int dip2px(float dpValue) {return (int) (dpValue * dm.density + 0.5f);}}
View使用：
package com.example.demo;import android.app.Activity;import android.os.Bundle;import android.os.Handler;import android.os.Message;public class MainActivity extends Activity {private IndiactorView indictorView;private int i = 0;private Handler handler = new Handler() {public void handleMessage(Message msg) {indictorView.setPosition(i++);if (i <= 100) {this.sendEmptyMessageDelayed(0x01, 500);}};};@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);indictorView = (IndiactorView) findViewById(R.id.indictor_view);indictorView.setPosition(i);handler.sendEmptyMessageDelayed(0x01, 500);}}
注释的已经很详细了，就不在啰嗦的解释代码了，源码及如何使用DEMO会在最后给出。
扩展：对指示器添加触摸事件处理，可以将此progressbar扩站位一个带指示器的SeekBar,待后续完成后给出。有兴趣的也可以自行扩展。
DEMO下载
