Android中制作进度框和环形进度条的简单实例分享

import android.content.Context; 
import android.graphics.Canvas; 
import android.graphics.Color; 
import android.graphics.Paint; 
import android.util.AttributeSet; 
import android.view.View; 
 
import java.util.Random; 


public class ObliqueProgressbar extends View { 
 
  private Paint mPaint; 
  private float mProgress; 
 
  public ObliqueProgressbar(Context context) { 
    this(context, null); 
  } 
 
  public ObliqueProgressbar(Context context, AttributeSet attrs) { 
    this(context, attrs, 0); 
  } 
 
  public ObliqueProgressbar(Context context, AttributeSet attrs, int defStyleAttr) { 
    super(context, attrs, defStyleAttr); 
 
    mPaint = new Paint(); 
    mPaint.setAntiAlias(true); 
  } 
 
 
  @Override 
  protected void onDraw(Canvas canvas) { 
    super.onDraw(canvas); 
 
    if (mProgress == 0) return; 
 
    //碎片雨 
    mPaint.setColor(Color.parseColor("#a96ecb")); 
    mPaint.setStrokeWidth(3); 
    Random random = new Random(); 
    int sx, sy; 
    for (int i = 0; i <200; i++) { 
      sx = random.nextInt(getWidth() + 10); 
      sy = random.nextInt(getHeight() + 10); 
//      canvas.drawLine(sx, sy, sx+random.nextInt(5), sy+random.nextInt(5), mPaint); 
      canvas.drawCircle(sx, sy, random.nextInt(5) + 1, mPaint); 
    } 
 
    //进度 
    mPaint.setColor(Color.parseColor("#6AFFFFFF")); 
    mPaint.setStrokeWidth(15); 
    float x = mProgress * getWidth(); 
    for (int i = 0; i 

ckage 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;//大圆 半径 
  Bitmap barBitmap = Bitmap.createBitmap(w, h, Bitmap.Config.ARGB_8888); 
  Paint paint = new Paint(); 
  paint.setAntiAlias(true); //抗锯齿 
  paint.setStrokeWidth(strokeWidth); //描边宽 
  paint.setDither(true); //防抖动 
 
  /* 外边框 */ 
  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); //没啥用 只是看外边框的 
 
  /* 内圆 */ 
  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); 
 
  /* 外圆 */ 
  paint.setColor(mBarColor); 
  paint.setStyle(Paint.Style.STROKE); 
  circleCanvas.drawCircle(w / 2, h / 2, radius, paint); 
 
  /* 圆弧 */ 
  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); 
 
  /* 文本 */ 
  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); 
 } 
 
 /** 
  * 计算并设置最适合的textSize 
  * 
  * @param paint 
  * @param max 最大宽度 
  * @param offset 偏移 
  */ 
 private void calcTextSize(Paint paint, int max, int offset) { 
  float width = paint.measureText("99.99%"); 
  while (width