Android如何實現自定義帶動畫效果的圓形ProgressBar

發布時間：2020-07-23 17:53:41 來源：億速云閱讀：912 作者：小豬欄目：移動開發

這篇文章主要講解了Android如何實現自定義帶動畫效果的圓形ProgressBar，內容清晰明了，對此有興趣的小伙伴可以學習一下，相信大家閱讀完之后會有幫助。

最近有個需求顯示進度，尾部還要有一標示，像下邊這樣

使用自定義View的方式實現，代碼如下，很簡單注釋的很清楚
文章最后我們拓展一下功能，實現一個帶動畫效果的進度條

package com.example.fwc.allexample.progressbar;

import android.animation.ValueAnimator;
import android.annotation.TargetApi;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.RectF;
import android.graphics.Typeface;
import android.os.Handler;
import android.os.Message;
import android.text.TextUtils;
import android.util.AttributeSet;
import android.util.Log;
import android.view.View;
import android.view.animation.DecelerateInterpolator;

import com.example.fwc.allexample.R;

/**
 * Created by fwc on 2016/7/6.
 */
public class CircleProgressBar extends View {
  private Context mContext;
  private Paint mPaint;
  private int mProgress = 0;
  private static int MAX_PROGRESS = 100;
  /**
   * 弧度
   */
  private int mAngle;
  /**
   * 中間的文字
   */
  private String mText;
  /**
   * 外圓顏色
   */
  private int outRoundColor;
  /**
   * 內圓的顏色
   */
  private int inRoundColor;
  /**
   * 線的寬度
   */
  private int roundWidth;
  private int style;
  /**
   * 字體顏色
   */
  private int textColor;
  /**
   * 字體大小
   */
  private float textSize;
  /**
   * 字體是否加粗
   */
  private boolean isBold;

  /**
   * 進度條顏色
   */
  private int progressBarColor;

  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);
    mContext = context;
    init(attrs);
  }

  @TargetApi(21)
  public CircleProgressBar(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
    super(context, attrs, defStyleAttr, defStyleRes);
    mContext = context;
    init(attrs);
  }

  /**
   * 解析自定義屬性
   *
   * @param attrs
   */
  public void init(AttributeSet attrs) {
    mPaint = new Paint();
    TypedArray typedArray = mContext.obtainStyledAttributes(attrs, R.styleable.CircleProgressBar);
    outRoundColor = typedArray.getColor(R.styleable.CircleProgressBar_outCircleColor, getResources().getColor(R.color.colorPrimary));
    inRoundColor = typedArray.getColor(R.styleable.CircleProgressBar_inCircleColor, getResources().getColor(R.color.colorPrimaryDark));
    progressBarColor = typedArray.getColor(R.styleable.CircleProgressBar_progressColor, getResources().getColor(R.color.colorAccent));
    isBold = typedArray.getBoolean(R.styleable.CircleProgressBar_textBold, false);
    textColor = typedArray.getColor(R.styleable.CircleProgressBar_textColor, Color.BLACK);
    roundWidth = typedArray.getDimensionPixelOffset(R.styleable.CircleProgressBar_lineWidth, 20);
    typedArray.recycle();
  }

  @Override
  protected void onDraw(Canvas canvas) {
    /**
     * 畫外圓
     */
    super.onDraw(canvas);
    int center = getWidth() / 2;        //圓心
    int radius = (center - roundWidth / 2);  //半徑
    mPaint.setColor(outRoundColor);      //外圓顏色
    mPaint.setStrokeWidth(roundWidth);     //線的寬度
    mPaint.setStyle(Paint.Style.STROKE);    //空心圓
    mPaint.setAntiAlias(true);        //消除鋸齒
    canvas.drawCircle(center, center, radius, mPaint);
    //內圓
    mPaint.setColor(inRoundColor);
    radius = radius - roundWidth;
    canvas.drawCircle(center, center, radius, mPaint);

    //畫進度是一個弧線
    mPaint.setColor(progressBarColor);
    RectF rectF = new RectF(center - radius, center - radius, center + radius, center + radius);//圓弧范圍的外接矩形
    canvas.drawArc(rectF, -90, mAngle, false, mPaint);
    canvas.save(); //平移畫布之前保存之前畫的

    //畫進度終點的小球,旋轉畫布的方式實現
    mPaint.setStyle(Paint.Style.FILL);
    //將畫布坐標原點移動至圓心
    canvas.translate(center, center);
    //旋轉和進度相同的角度，因為進度是從-90度開始的所以-90度
    canvas.rotate(mAngle - 90);
    //同理從圓心出發直接將原點平移至要畫小球的位置
    canvas.translate(radius, 0);
    canvas.drawCircle(0, 0, roundWidth, mPaint);
    //畫完之后恢復畫布坐標
    canvas.restore();

    //畫文字將坐標平移至圓心
    canvas.translate(center, center);
    mPaint.setStrokeWidth(0);
    mPaint.setColor(textColor);
    if (isBold) {
      //字體加粗
      mPaint.setTypeface(Typeface.DEFAULT_BOLD);
    }
    if (TextUtils.isEmpty(mText)) {
      mText = mProgress + "%";
    }
    //動態設置文字長為圓半徑，計算字體大小
    float textLength = mText.length();
    textSize = radius / textLength;
    mPaint.setTextSize(textSize);
    //將文字畫到中間
    float textWidth = mPaint.measureText(mText);
    canvas.drawText(mText, -textWidth / 2, textSize / 2, mPaint);
  }


  public int getmProgress() {
    return mProgress;
  }

  /**
   * 設置進度
   *
   * @return
   */
  public void setmProgress(int p) {
    if (p > MAX_PROGRESS) {
      mProgress = MAX_PROGRESS;
      mAngle = 360;
    } else {
      mProgress = p;
      mAngle = 360 * p / MAX_PROGRESS;
    }
  }


  public String getmText() {
    return mText;
  }

  /**
   * 設置文本
   *
   * @param mText
   */
  public void setmText(String mText) {
    this.mText = mText;
  }

  /**
   * 設置帶動畫的進度
   * @param p
   */
  public void setAnimProgress(int p) {
    if (p > MAX_PROGRESS) {
      mProgress = MAX_PROGRESS;
    } else {
      mProgress = p;
    }
    //設置屬性動畫
    ValueAnimator valueAnimator = new ValueAnimator().ofInt(0, p);
    //動畫從快到慢
    valueAnimator.setInterpolator(new DecelerateInterpolator());
    valueAnimator.setDuration(3000);
    //監聽值的變化
    valueAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
      @Override
      public void onAnimationUpdate(ValueAnimator animation) {
        int currentV = (Integer) animation.getAnimatedValue();
        Log.e("fwc", "current" + currentV);
        mAngle = 360 * currentV / MAX_PROGRESS;
        mText = currentV + "%";
        invalidate();
      }
    });
    valueAnimator.start();
  }
}

自定義屬性

<declare-styleable name="CircleProgressBar">
    <attr name="outCircleColor" format="color"></attr>
    <attr name="inCircleColor" format="color"></attr>
    <attr name="progressColor" format="color"></attr>
    <attr name="textColor" format="color"></attr>
    <attr name="textBold" format="boolean"></attr>
    <attr name="lineWidth" format="dimension"></attr>
</declare-styleable>

布局文件中使用

<&#63;xml version="1.0" encoding="utf-8"&#63;>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
  xmlns:tools="http://schemas.android.com/tools"
  xmlns:my="http://schemas.android.com/apk/res-auto"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  tools:context="com.example.fwc.allexample.progressbar.ProgressActivtiy">
<com.example.fwc.allexample.progressbar.CircleProgressBar
  android:id="@+id/progress_bar"
  android:layout_centerInParent="true"
  android:layout_width="150dp"
  android:layout_height="150dp"
  my:inCircleColor="#DCDCDC"
  my:outCircleColor="#F0F0F0"
  my:progressColor="#50CE7B"
  my:textBold="true"
  my:textColor="#50CE7B"
  my:lineWidth="5dp"
  />
</RelativeLayout>

activity中設置進度，顯示文字

package com.example.fwc.allexample.progressbar;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;

import com.example.fwc.allexample.R;

public class ProgressActivtiy extends AppCompatActivity {
  CircleProgressBar circleProgressBar;
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_progress_activtiy);
    circleProgressBar = (CircleProgressBar)findViewById(R.id.progress_bar);
    circleProgressBar.setProgress(65);
    circleProgressBar.setmText(circleProgressBar.getProgress()+"%");
  }
}

效果圖

Android如何實現自定義帶動畫效果的圓形ProgressBar

拓展

拓展也很簡單，加一個setAnimProgress(int p)設置動畫效果:

/**
   * 設置帶動畫的進度
   * @param p
   */
  public void setAnimProgress(int p) {
    if (p > MAX_PROGRESS) {
      mProgress = MAX_PROGRESS;
    } else {
      mProgress = p;
    }
    //設置屬性動畫
    ValueAnimator valueAnimator = new ValueAnimator().ofInt(0, p);
    //動畫從快到慢
    valueAnimator.setInterpolator(new DecelerateInterpolator());
    valueAnimator.setDuration(3000);
    //監聽值的變化
    valueAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
      @Override
      public void onAnimationUpdate(ValueAnimator animation) {
        int currentV = (Integer) animation.getAnimatedValue();
        Log.e("fwc", "current" + currentV);
        mAngle = 360 * currentV / MAX_PROGRESS;
        mText = currentV + "%";
        invalidate();
      }
    });
    valueAnimator.start();
  }

在activity中調用這個方法

circleProgressBar.setAnimProgress(65);

效果如下

Android如何實現自定義帶動畫效果的圓形ProgressBar

看完上述內容，是不是對Android如何實現自定義帶動畫效果的圓形ProgressBar有進一步的了解，如果還想學習更多內容，歡迎關注億速云行業資訊頻道。

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Android如何實現自定義帶動畫效果的圓形ProgressBar

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