android自訂圓形進度條，實現動態畫圓效果

標籤：android自訂圓形進度條

自訂圓形進度條如下：應用情境如動態顯示分數等。

view的自訂屬性如下attr.xml

<?xml version="1.0" encoding="UTF-8"?><resources>      <declare-styleable name="ArcProgressbar">        <!-- 圓環起始角度-->        <attr name="startAngle" format="integer" />        <attr name="radius" format="integer" />        <!-- 圓環的寬度  預設115-->        <attr name="trokeWidth" format="integer" />        <!-- 進度條進度顏色 -->        <attr name="arcColor" format="color" />    </declare-styleable></resources>

view代碼如下：

package com.gdmob.ui;import android.content.Context;import android.content.res.Resources;import android.content.res.TypedArray;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Paint;import android.graphics.Paint.Cap;import android.graphics.RectF;import android.util.AttributeSet;import android.util.DisplayMetrics;import android.util.Log;import android.util.TypedValue;import android.view.View;import com.cwits.cex.picc.R;/** * 自訂圓形進度條 * @author hai * */public class ArcProgressbar extends View {/** * 圓環半徑 */private int mRadius = 115; // Diameter英文為直徑，該常量表示小圓直徑的dp值/** * 圓環的寬度 */private int mTrokeWidth = 15;/** * 起始角度 */private int mStartAngle = 135;/** * 進度條進度顏色 */private int mArcColor;private Paint mPaint;private int mProgress;// 表示進度private RectF mRect;private int mDiameter; // Diameter英文為直徑，在該View中要繪製圓環，圓環由兩個圓形確定（大圓和小圓），這個整形值表示小圓直徑。private int mWidth;// 這個值表示圓環的寬度的2倍（大圓直徑-小圓直徑）private final int defaultColor; // 進度條背景顏色public ArcProgressbar(Context context, AttributeSet attrs, int defStyle) {super(context, attrs, defStyle);defaultColor = Color.TRANSPARENT;TypedArray ta = context.getTheme().obtainStyledAttributes(attrs, R.styleable.ArcProgressbar, defStyle, 0);int num = ta.getIndexCount();for (int i = 0; i < num; i++) {int attr = ta.getIndex(i);switch (attr) {case R.styleable.ArcProgressbar_startAngle:mStartAngle = ta.getInt(attr, 135);break;case R.styleable.ArcProgressbar_arcColor:mArcColor = ta.getColor(attr, Color.parseColor("#eed306"));break;case R.styleable.ArcProgressbar_trokeWidth:mTrokeWidth = ta.getInt(attr, 15);break;case R.styleable.ArcProgressbar_radius:mRadius = ta.getInt(attr, 115);break;}}init();}public ArcProgressbar(Context context, AttributeSet attrs) {this(context, attrs, 0);}public ArcProgressbar(Context context) {this(context, null);}private void init() {Resources res = getResources();// getDisplayMetrics()返回當前展示的metrics.DisplayMetrics metrics = res.getDisplayMetrics();// TypedValue.applyDimension(int unit, float value, DisplayMetrics// metrics)// 該方法中unit表示要轉換成的單位，value表示數值，metrics表示當前的度量方式// DIAMETER是常量0x1E,十進位為30，下面語句就表示tmp的值為30dp換算成的像素數值float tmp = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, mRadius, metrics);// ceil函數表示向上取整mDiameter = (int) Math.ceil(tmp);tmp = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, mTrokeWidth, metrics);mWidth = (int) Math.ceil(tmp);Paint p = new Paint();p.setStyle(Paint.Style.STROKE);p.setAntiAlias(true);// setStrokeWidth()設定畫筆寬度// p.setStrokeWidth(0.5F*mWidth+0.5F*mDiameter);p.setStrokeWidth(0.4F * mWidth);p.setStrokeCap(Cap.ROUND);p.setColor(defaultColor);mPaint = p;float rightTop = (float) (mWidth / 2.0);// 這個值就是圓環寬度（大圓半徑-小圓半徑）mRect = new RectF(rightTop, rightTop, mDiameter + rightTop, mDiameter + rightTop);mProgress = 0;}protected boolean clear = false;@Overrideprotected void onDraw(Canvas canvas) {// super.onDraw(canvas);// 如果mProgress<360,則圓形進度條還未旋轉完成，則用0x7f的透明度繪製一個完整的圓形作為進度條背景// 注意要先繪製背景條，再繪製進度條，因為後繪製的會覆蓋在先繪製的上面/* * if (mProgress < 360) { paint.setAlpha(0x7f); * paint.setColor(defaultColor); canvas.drawArc(mRect, 135, 270, false, * paint); } */if (clear) {mPaint.setColor(Color.TRANSPARENT);clear = false;return;}if (mProgress != 0) {Paint paint = mPaint;paint.setColor(mArcColor);float degree = (float) (360.0f * mProgress / 360);paint.setAlpha(0xff);paint.setColor(mArcColor);canvas.drawArc(mRect, mStartAngle, degree, false, paint);}}@Overrideprotected final void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {// mDiameter表示小圓直徑，mWidth表示圓環寬度的2倍，所以meas表示大圓直徑// 所以View的hight，width都為measfinal int meas = mDiameter + mWidth;setMeasuredDimension(meas, meas);}public void setProgress(int p) {mProgress = p;invalidate();}public void postProgress(final int p) {post(new Runnable() {@Overridepublic void run() {setProgress(p);}});}public void setmArcColor(int mArcColor) {this.mArcColor = mArcColor;}public void reset() {clear = true;invalidate();mProgress = 0;}}

如上要讓分數和進度條動態從0變到90，思路:定義一個變數mProgress=0,new一個定時任務，讓mProgress慢慢從0 加到90後停止，

ArcProgressbar不停地調用setProgress(int p)就可以了。

代碼如下：

private void setGrade(final int g) {mProgress = 1;arcProgressbar.reset();final Handler handler = new Handler() {@Overridepublic void handleMessage(Message msg) {if (0 < (mProgress / 3.6) && (mProgress / 3.6) <= 59) {arcProgressbar.setmArcColor(Color.parseColor("#ff0000"));tv_grade.setTextColor(Color.parseColor("#ff0000"));} else if (60 < (mProgress / 3.6) && (mProgress / 3.6) <= 79) {arcProgressbar.setmArcColor(Color.parseColor("#f39700"));tv_grade.setTextColor(Color.parseColor("#f39700"));} else if (80 < (mProgress / 3.6) && (mProgress / 3.6) <= 100) {arcProgressbar.setmArcColor(Color.parseColor("#42ae7c"));tv_grade.setTextColor(Color.parseColor("#42ae7c"));}if (msg.what == 0x1223) {arcProgressbar.setProgress(mProgress * (1));tv_grade.setText("" + (int) (mProgress / 3.6));} else if (msg.what == 0x1224) {tv_grade.setText("" + g);}}};new Timer().schedule(new TimerTask() {@Overridepublic void run() {Message msg = new Message();if (mProgress < (int) (((float) 360 / 100) * g)) {msg.what = 0x1223;mProgress++;} else {msg.what = 0x1224;this.cancel();}handler.sendMessage(msg);}}, 0, 5);}

android自訂圓形進度條，實現動態畫圓效果