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：
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();
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
int viewHeight = (int) (bitmapIndictorHeight + bitmapProgressHeight + rectHeight);
setMeasuredDimension((int) screenWidth, viewHeight);
}
@Override
public boolean onTouchEvent(MotionEvent event) {
return super.onTouchEvent(event);
}
@Override
protected 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
*/
@Override
protected 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);
}
};
};
@Override
protected 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。
android自定义 ProgressBar(继承自View)
原文地址：http://blog.csdn.net/lcq5211314123/article/details/45869833
