挺久沒寫文章了奖地,近段時間被拉過去寫JS項目了橄唬,在做一個項目的時候,遇到一個新的需求就是空氣質(zhì)量参歹,實現(xiàn)空氣污染指數(shù)的時候仰楚,需要到一個圓弧的進度,在網(wǎng)上沒找到合適犬庇,干脆就自己寫了一個僧界,順便復(fù)習一下自定義View,下面是具體的實現(xiàn)臭挽。
先看一下效果
這里的話我只做一個進度條捂襟,使用也很簡單。圓弧外的文本是一個textview欢峰,不是這個控件里面的葬荷,說明一下。
下面先看一下整體的代碼:
import android.animation.ValueAnimator;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Rect;
import android.graphics.RectF;
import android.support.annotation.Nullable;
import android.util.AttributeSet;
import android.view.View;
public class ArcProgressBar extends View {
private static final String TAG = "ArcProgressBar";
/**
* 圓弧的寬度
*/
private int mStrokeWidth = dp2px(8);
/**
* 圓弧開始的角度
*/
private float mStartAngle = 135;
/**
* 起點角度和終點角度對應(yīng)的夾角大小
*/
private float mAngleSize = 270;
/**
* 圓弧背景顏色
*/
private int mArcBgColor = Color.YELLOW;
/**
* 最大的進度纽帖,用于計算進度與夾角的比例
*/
private float mMaxProgress = 500;
/**
* 當前進度對應(yīng)的起點角度到當前進度角度夾角的大小
*/
private float mCurrentAngleSize = 0;
/**
* 當前進度
*/
private float mCurrentProgress = 0;
/**
* 動畫的執(zhí)行時長
*/
private long mDuration = 3000;
/**
* 進度圓弧的顏色
*/
private int mProgressColor = Color.RED;
/**
* 第一行文本
*/
private String mFirstText = "42";
/**
* 第一行文本的顏色
*/
private int mFirstTextColor = Color.RED;
/**
* 第一行文本的字體大小
*/
private float mFirstTextSize = 56f;
/**
* 第二行文本
*/
private String mSecondText = "優(yōu)";
/**
* 第二行文本的顏色
*/
private int mSecondTextColor = Color.RED;
/**
* 第二行文本的字體大小
*/
private float mSecondTextSize = 56f;
public ArcProgressBar(Context context) {
super(context, null);
}
public ArcProgressBar(Context context, @Nullable AttributeSet attrs) {
super(context, attrs, 0);
}
public ArcProgressBar(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
initAttr(context, attrs);
}
/**
* 設(shè)置初始化的參數(shù)
*
* @param context
* @param attrs
*/
private void initAttr(Context context, AttributeSet attrs) {
TypedArray array = context.obtainStyledAttributes(attrs, R.styleable.ArcProgressBar);
mMaxProgress = array.getFloat(R.styleable.ArcProgressBar_arc_max_progress, 500f);
mArcBgColor = array.getColor(R.styleable.ArcProgressBar_arc_bg_color, Color.YELLOW);
mStrokeWidth = dp2px(array.getDimension(R.styleable.ArcProgressBar_arc_stroke_width, 12f));
mCurrentProgress = array.getFloat(R.styleable.ArcProgressBar_arc_progress, 300f);
mProgressColor = array.getColor(R.styleable.ArcProgressBar_arc_progress_color, Color.RED);
mFirstText = array.getString(R.styleable.ArcProgressBar_arc_first_text);
mFirstTextSize = dp2px(array.getDimension(R.styleable.ArcProgressBar_arc_first_text_size, 20f));
mFirstTextColor = array.getColor(R.styleable.ArcProgressBar_arc_first_text_color, Color.RED);
mSecondText = array.getString(R.styleable.ArcProgressBar_arc_second_text);
mSecondTextSize = dp2px(array.getDimension(R.styleable.ArcProgressBar_arc_second_text_size, 20f));
mSecondTextColor = array.getColor(R.styleable.ArcProgressBar_arc_second_text_color, Color.RED);
mAngleSize = array.getFloat(R.styleable.ArcProgressBar_arc_angle_size, 270f);
mStartAngle = array.getFloat(R.styleable.ArcProgressBar_arc_start_angle, 135f);
array.recycle();
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
int centerX = getWidth() / 2;
RectF rectF = new RectF();
rectF.left = mStrokeWidth;
rectF.top = mStrokeWidth;
rectF.right = centerX * 2 - mStrokeWidth;
rectF.bottom = centerX * 2 - mStrokeWidth;
//畫最外層的圓弧
drawArcBg(canvas, rectF);
//畫進度
drawArcProgress(canvas, rectF);
//繪制第一級文本
drawFirstText(canvas, centerX);
//繪制第二級文本
drawSecondText(canvas, centerX);
}
/**
* 畫最開始的圓弧
*
* @param canvas
* @param rectF
*/
private void drawArcBg(Canvas canvas, RectF rectF) {
Paint mPaint = new Paint();
//畫筆的填充樣式宠漩,Paint.Style.FILL 填充內(nèi)部;Paint.Style.FILL_AND_STROKE 填充內(nèi)部和描邊;Paint.Style.STROKE 描邊
mPaint.setStyle(Paint.Style.STROKE);
//圓弧的寬度
mPaint.setStrokeWidth(mStrokeWidth);
//抗鋸齒
mPaint.setAntiAlias(true);
//畫筆的顏色
mPaint.setColor(mArcBgColor);
//畫筆的樣式 Paint.Cap.Round 圓形,Cap.SQUARE 方形
mPaint.setStrokeCap(Paint.Cap.ROUND);
//開始畫圓弧
canvas.drawArc(rectF, mStartAngle, mAngleSize, false, mPaint);
}
/**
* 畫進度的圓弧
*
* @param canvas
* @param rectF
*/
private void drawArcProgress(Canvas canvas, RectF rectF) {
Paint paint = new Paint();
paint.setStyle(Paint.Style.STROKE);
paint.setStrokeWidth(mStrokeWidth);
paint.setColor(mProgressColor);
paint.setAntiAlias(true);
paint.setStrokeCap(Paint.Cap.ROUND);
canvas.drawArc(rectF, mStartAngle, mCurrentAngleSize, false, paint);
}
/**
* 繪制第一級文字
*
* @param canvas 畫筆
* @param centerX 位置
*/
private void drawFirstText(Canvas canvas, float centerX) {
Paint paint = new Paint();
paint.setAntiAlias(true);
paint.setColor(mFirstTextColor);
paint.setTextAlign(Paint.Align.CENTER);
paint.setTextSize(mFirstTextSize);
Rect firstTextBounds = new Rect();
paint.getTextBounds(mFirstText, 0, mFirstText.length(), firstTextBounds);
canvas.drawText(mFirstText, centerX, firstTextBounds.height() / 2 + getHeight() * 2 / 5, paint);
}
/**
* 繪制第二級文本
*
* @param canvas 畫筆
* @param centerX 文本
*/
private void drawSecondText(Canvas canvas, float centerX) {
Paint paint = new Paint();
paint.setAntiAlias(true);
paint.setColor(mSecondTextColor);
paint.setTextAlign(Paint.Align.CENTER);
paint.setTextSize(mSecondTextSize);
Rect bounds = new Rect();
paint.getTextBounds(mSecondText, 0, mSecondText.length(), bounds);
canvas.drawText(mSecondText, centerX, getHeight() / 2 + bounds.height() / 2 +
getFontHeight(mSecondText, mSecondTextSize), paint);
}
/**
* 設(shè)置最大的進度
*
* @param progress
*/
public void setMaxProgress(int progress) {
if (progress < 0) {
throw new IllegalArgumentException("Progress value can not be less than 0 ");
}
mMaxProgress = progress;
}
/**
* 設(shè)置當前進度
*
* @param progress
*/
public void setProgress(float progress) {
if (progress < 0) {
throw new IllegalArgumentException("Progress value can not be less than 0");
}
if (progress > mMaxProgress) {
progress = mMaxProgress;
}
mCurrentProgress = progress;
float size = mCurrentProgress / mMaxProgress;
mCurrentAngleSize = (int) (mAngleSize * size);
setAnimator(0, mCurrentAngleSize);
}
/**
* 設(shè)置進度圓弧的顏色
*
* @param color
*/
public void setProgressColor(int color) {
if (color == 0) {
throw new IllegalArgumentException("Color can no be 0");
}
mProgressColor = color;
}
/**
* 設(shè)置圓弧的顏色
*
* @param color
*/
public void setArcBgColor(int color) {
if (color == 0) {
throw new IllegalArgumentException("Color can no be 0");
}
mArcBgColor = color;
}
/**
* 設(shè)置圓弧的寬度
*
* @param strokeWidth
*/
public void setStrokeWidth(int strokeWidth) {
if (strokeWidth < 0) {
throw new IllegalArgumentException("strokeWidth value can not be less than 0");
}
mStrokeWidth = dp2px(strokeWidth);
}
/**
* 設(shè)置動畫的執(zhí)行時長
*
* @param duration
*/
public void setAnimatorDuration(long duration) {
if (duration < 0) {
throw new IllegalArgumentException("Duration value can not be less than 0");
}
mDuration = duration;
}
/**
* 設(shè)置第一行文本
*
* @param text
*/
public void setFirstText(String text) {
mFirstText = text;
}
/**
* 設(shè)置第一行文本的顏色
*
* @param color
*/
public void setFirstTextColor(int color) {
if (color <= 0) {
throw new IllegalArgumentException("Color value can not be less than 0");
}
mFirstTextColor = color;
}
/**
* 設(shè)置第一行文本的大小
*
* @param textSize
*/
public void setFirstTextSize(float textSize) {
if (textSize <= 0) {
throw new IllegalArgumentException("textSize can not be less than 0");
}
mFirstTextSize = textSize;
}
/**
* 設(shè)置第二行文本
*
* @param text
*/
public void setSecondText(String text) {
mSecondText = text;
}
/**
* 設(shè)置第二行文本的顏色
*
* @param color
*/
public void setSecondTextColor(int color) {
if (color == 0) {
throw new IllegalArgumentException("Color value can not be less than 0");
}
mSecondTextColor = color;
}
/**
* 設(shè)置第二行文本的大小
*
* @param textSize
*/
public void setSecondTextSize(float textSize) {
if (textSize <= 0) {
throw new IllegalArgumentException("textSize can not be less than 0");
}
mSecondTextSize = textSize;
}
/**
* 設(shè)置圓弧開始的角度
*
* @param startAngle
*/
public void setStartAngle(int startAngle) {
mStartAngle = startAngle;
}
/**
* 設(shè)置圓弧的起始角度到終點角度的大小
*
* @param angleSize
*/
public void setAngleSize(int angleSize) {
mAngleSize = angleSize;
}
/**
* dp轉(zhuǎn)成px
*
* @param dp
* @return
*/
private int dp2px(float dp) {
float density = getResources().getDisplayMetrics().density;
return (int) (dp * density + 0.5f * (dp >= 0 ? 1 : -1));
}
/**
* 設(shè)置動畫
*
* @param start 開始位置
* @param target 結(jié)束位置
*/
private void setAnimator(float start, float target) {
ValueAnimator valueAnimator = ValueAnimator.ofFloat(start, target);
valueAnimator.setDuration(mDuration);
valueAnimator.setTarget(mCurrentAngleSize);
valueAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
@Override
public void onAnimationUpdate(ValueAnimator valueAnimator) {
mCurrentAngleSize = (float) valueAnimator.getAnimatedValue();
invalidate();
}
});
valueAnimator.start();
}
/**
* 測量字體的高度
*
* @param textStr
* @param fontSize
* @return
*/
private float getFontHeight(String textStr, float fontSize) {
Paint paint = new Paint();
paint.setTextSize(fontSize);
Rect bounds = new Rect();
paint.getTextBounds(textStr, 0, textStr.length(), bounds);
return bounds.height();
}
}
然后是具體使用控件里面的代碼:
<com.amos.customview.ArcProgressBar
android:id="@+id/arc"
android:layout_width="100dp"
android:layout_height="100dp"
android:layout_gravity="center"/>
這里使用非常簡單,跟其它控件的使用沒什么區(qū)別懊直。
里面還定義了很多直接在xml文件里面就可以直接設(shè)置的屬性
<declare-styleable name="ArcProgressBar">
<attr name="arc_max_progress" format="float"/>
<attr name="arc_bg_color" format="color"/>
<attr name="arc_stroke_width" format="dimension"/>
<attr name="arc_progress" format="float"/>
<attr name="arc_progress_color" format="color"/>
<attr name="arc_first_text" format="string"/>
<attr name="arc_first_text_color" format="color"/>
<attr name="arc_first_text_size" format="dimension"/>
<attr name="arc_second_text" format="string"/>
<attr name="arc_second_text_color" format="color"/>
<attr name="arc_second_text_size" format="dimension"/>
<attr name="arc_angle_size" format="float"/>
<attr name="arc_start_angle" format="float"/>
</declare-styleable>
這個自定義View非常簡單扒吁,代碼里面注釋也寫的很清楚了,就不做過多的介紹了室囊,有興趣的可以去做更多的擴展瘦陈,比如,直接做成圓形或者扇形波俄,還有這里必須要兩行文本晨逝,如果項目需要,也可以直接去刪除掉文本懦铺,不過需要計算一下文本的繪制位置捉貌。
有興趣的可以去GitHub上面給個Start,地址是:傳送門