android生成自适應的圓,Android 自定義圓環進度條 自适應顯示百分比

package com.stone.circleprogressbar.view;

import android.content.Context;

import android.content.res.TypedArray;

import android.graphics.Bitmap;

import android.graphics.Canvas;

import android.graphics.Color;

import android.graphics.LinearGradient;

import android.graphics.Paint;

import android.graphics.RectF;

import android.graphics.Shader;

import android.util.AttributeSet;

import android.view.View;

import com.stone.circleprogressbar.R;

public class CircleProgressbar extends View {

private float mProgress;

private int mBarColor;

private int mTextColor;

private float mTextSize;

public CircleProgressbar(Context context) {

this(context, null);

}

public CircleProgressbar(Context context, AttributeSet attrs) {

this(context, attrs, 0);

}

public CircleProgressbar(Context context, AttributeSet attrs, int defStyleAttr) {

super(context, attrs, defStyleAttr);

TypedArray array = context.obtainStyledAttributes(attrs, R.styleable.CircleProgressbar);

mBarColor = array.getColor(R.styleable.CircleProgressbar_barColor, Color.GRAY);

mTextColor = array.getColor(R.styleable.CircleProgressbar_textColor, Color.GRAY);

mProgress = array.getFloat(R.styleable.CircleProgressbar_progress, 0);

}

@Override

protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {

super.onMeasure(widthMeasureSpec, heightMeasureSpec);

}

public void setProgress(float count) {

mProgress = count;

invalidate();

}

@Override

protected void onDraw(Canvas canvas) {

int w = getWidth();

int h = getHeight();

int strokeWidth = 20;

int radius = w / 2 - strokeWidth / 2;//大圓 半徑

Bitmap barBitmap = Bitmap.createBitmap(w, h, Bitmap.Config.ARGB_8888);

Paint paint = new Paint();

paint.setAntiAlias(true); //抗鋸齒

paint.setStrokeWidth(strokeWidth); //描邊寬

paint.setDither(true); //防抖動

Canvas circleCanvas = new Canvas(barBitmap);

RectF rect = new RectF(0, 0, w, h);

paint.setColor(Color.argb(0x11, 0xcc, 0xcc, 0xcc));

// circleCanvas.drawRect(rect, paint); //沒啥用 隻是看外邊框的

paint.setColor(Color.CYAN);

paint.setShader(new LinearGradient(0, 0, w, h, Color.RED, Color.GREEN, Shader.TileMode.CLAMP));

circleCanvas.drawCircle(w / 2, h / 2, radius - strokeWidth / 2, paint);

paint.setShader(null);

paint.setColor(mBarColor);

paint.setStyle(Paint.Style.STROKE);

circleCanvas.drawCircle(w / 2, h / 2, radius, paint);

paint.setShader(new LinearGradient(0, 0, w, h,

new int[]{Color.GREEN, Color.MAGENTA, Color.CYAN, Color.RED},

new float[]{0.2f, 0.5f, 0.7f, 1.0f}, Shader.TileMode.CLAMP));

float cur = mProgress * 360 * 0.01f;

circleCanvas.drawArc(new RectF(strokeWidth / 2, strokeWidth / 2, w - strokeWidth / 2, h - strokeWidth / 2),

360 - 45, cur, false, paint);

paint.setShader(null);

paint.setColor(mTextColor);

if (mTextSize == 0) {

calcTextSize(paint, w, strokeWidth);

} else {

paint.setTextSize(mTextSize);

}

paint.setTextAlign(Paint.Align.LEFT);//default

String percent = mProgress + "%";

paint.setStyle(Paint.Style.FILL);

circleCanvas.drawText(percent, w / 2 - paint.measureText(percent) / 2, h / 2 + paint.getTextSize() / 2, paint);

canvas.drawBitmap(barBitmap, 0, 0, paint);

}

private void calcTextSize(Paint paint, int max, int offset) {

float width = paint.measureText("99.99%");

while (width < max * 3 / 5) {

paint.setTextSize(paint.getTextSize() + 5);

width = paint.measureText("92.88%") + offset / 2;

}

mTextSize = paint.getTextSize();

}

}

設定進度重新整理顯示  調用

setProgress()即可