前言
因為本人是個魅族控,魅族的UI以及頁面風格真的是深入我心,特別是一些小動效更是讓我愛不釋手,所以也想仿著來做一點,好吧,囉嗦畢了,看下實現的UI效果。 這個是魅族應用商店下載進度條的進度讀取,我挺喜歡這個效果的,具體效果我們分成3部分:
- 沒開始之前顯示 圓角按鈕
- 點選下載後有一個縮回去的動畫,縮成一個圓,然後進行進度條載入
- 進度條走到底之後再次橫向拉,拉成一個圓角按鈕,上面顯示安裝或者是開啟。
下圖看下具體的實現效果
gayHub地址:https://github.com/LinHuanTanLy/CircularProgressBar.git
實現過程
需求分析
先動腦再動手。 很明顯這裡面涉及到了畫弧形,畫圓角矩形,畫字,屬性動畫,這些單獨拆出來問題不大,合併在一起就麻煩點了。 思路:
- 先畫矩形
- 點選 矩形回收,縮到一定倍數後不再畫矩形,改而畫進度條(雖然是叫進度條,但是我們不考慮用progressbar也不考慮畫圓,我們畫弧形來實現) 3.根據進度來選擇畫多少弧度的弧形,當到達360弧度的時候,即進度100%,這個時候不再畫弧形,改而畫圓角矩形,橫向拉伸到圓角矩形的寬度。
具體動手
定義需要的引數
// 定義 寬 高 半徑 開始角度 滑動角度
private int mW, mH, mRadius, mStartAngle = 0, mSweepAngle = 0;
// 預設弧形的顏色,進度條顏色,暫停槓槓的顏色,字型顏色
private int mDefColor, mProgressColor, mTabColor, mFontColor;
// 畫進度弧度,畫中間暫停斜槓,畫預設弧度,畫文字
private Paint mPaintForCircle, mPaintForTag, mPaintForDefCircle, mPaintForText;
// 是否畫進度條
private boolean isDrawProgressBar = false;
// 由圓形進度條 進化到 圓角矩形 需要增長的半徑的倍數以及最大倍數
private final float sMultiple = 1f, sMaxMultiple = 2.5f;
// 可變的倍數
private float mMultiple = sMaxMultiple;
// 進度條的寬度,圓角矩形的寬度
private float mStrokeWidthCircle = 12, mRectWidth = 6;
// 圓角矩形中的提示文字
private String mTipsStr = "下載", mTipsInstallStr = "安裝";
// 圓角矩形中的提示文字字號大小
private float mTipsStrFontSize = 40;
// 下載監聽
private OnProgressListener mOnProgressListener;
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重寫onDraw()
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
canvas.translate(mW / 2, mH / 2);
if (isDrawProgressBar) {
drawPauseTag(canvas);
drawDefCircle(canvas);
drawBigCircle(canvas);
} else {
drawRoundRect(canvas);
}
}
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這裡我們根據isDrawProgressBar來判斷是畫什麼圖形,相對應的方法如下:
/**
* 畫中間的暫停按鈕
*
* @param canvas
*/
private void drawPauseTag(Canvas canvas) {
mPaintForTag.setColor(mTabColor);
RectF rectFLeft = new RectF(-mRadius / 2.6f, -mRadius / 2.4f, -mRadius / 8, mRadius / 2.4f);
RectF rectFRight = new RectF(mRadius / 8, -mRadius / 2.4f, mRadius / 2.6f, mRadius / 2.4f);
canvas.drawRect(rectFLeft, mPaintForTag);
canvas.drawRect(rectFRight, mPaintForTag);
}
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/**
* 畫基礎的背景圓
*
* @param canvas
*/
private void drawDefCircle(Canvas canvas) {
mPaintForDefCircle.setStrokeWidth(mStrokeWidthCircle);
mPaintForDefCircle.setColor(mDefColor);
RectF rectF = new RectF(-mRadius, -mRadius, mRadius, mRadius);
canvas.drawArc(rectF, mStartAngle, 360, false, mPaintForDefCircle);
}
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/**
* 畫進度弧形
*
* @param canvas
*/
private void drawBigCircle(Canvas canvas) {
mPaintForCircle.setColor(mProgressColor);
mPaintForCircle.setStrokeWidth(mStrokeWidthCircle);
RectF rectF = new RectF(-mRadius, -mRadius, mRadius, mRadius);
canvas.drawArc(rectF, mStartAngle, mSweepAngle, false, mPaintForCircle);
}
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/**
* 畫圓角矩形
*
* @param canvas
*/
private void drawRoundRect(Canvas canvas) {
mPaintForCircle.setStrokeWidth(mRectWidth);
mPaintForCircle.setColor(mProgressColor);
RectF rectF = new RectF(-mRadius * mMultiple, -mRadius, mRadius * mMultiple, mRadius);
canvas.drawRoundRect(rectF, 60, 60, mPaintForCircle);
mPaintForCircle.setStrokeWidth(mStrokeWidthCircle);
if (mMultiple == sMaxMultiple) {
drawTipsText(rectF, canvas);
}
}
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這時候基本的模板已經畫好了,怎麼讓他動起來呢?我們考慮使用屬性動畫
屬性動畫
/**
* 用屬性動畫繪製元件 開始畫圓角矩形
*/
private void doDrawRect() {
ValueAnimator valueAnimator = ValueAnimator.ofFloat(sMultiple, sMaxMultiple);
valueAnimator.setDuration(500);
valueAnimator.addUpdateListener(animation -> {
mMultiple = (float) animation.getAnimatedValue();
invalidate();
});
valueAnimator.start();
}
/**
* 用屬性動畫繪製元件 開始畫進度條
*/
private void doDrawProgress() {
ValueAnimator valueAnimator = ValueAnimator.ofFloat(sMaxMultiple, sMultiple);
valueAnimator.setDuration(500);
valueAnimator.addUpdateListener(animation -> {
float rate = (float) animation.getAnimatedValue();
mMultiple = rate;
invalidate();
if (rate == sMultiple) {
isDrawProgressBar = true;
invalidate();
}
});
valueAnimator.start();
}
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設定文字
自定義View寫文字一向是讓人討厭的,因為baseline實在是不好找(也可能是我太笨),這裡是在一個限定好的圓角矩形裡面寫文字,所以相對比較好處理一些:
/**
* 畫矩形框中的文字
*
* @param rectF
* @param canvas
*/
private void drawTipsText(RectF rectF, Canvas canvas) {
mPaintForText.setTextSize(mTipsStrFontSize);
mPaintForText.setColor(mFontColor);
Paint.FontMetricsInt fontMetrics = mPaintForText.getFontMetricsInt();
float baseline2 = rectF.bottom - ((rectF.bottom - rectF.top - fontMetrics.bottom + fontMetrics.top) / 2 + fontMetrics.bottom);
canvas.drawText(mTipsStr, rectF.centerX(), baseline2, mPaintForText);
}
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自定義屬性
- value/attrs.xml 定義屬性檔案:
<?xml version="1.0" encoding="utf-8"?>
<resources>
<declare-styleable name="circular">
<!--預設弧度的顏色-->
<attr name="defColor" format="color"/>
<!--進度條顏色-->
<attr name="progressColor" format="color"/>
<!--暫停槓槓的顏色-->
<attr name="tabColor" format="color"/>
<!--字型顏色-->
<attr name="fontColor" format="color"/>
<!--提示文字-->
<attr name="tipsStr" format="string"/>
<!--進度完成後的提示文字-->
<attr name="finishStr" format="string"/>
<!--字型大小-->
<attr name="fontSize" format="dimension"/>
<!--圓角矩形的寬度-->
<attr name="rectWidth" format="dimension"/>
<!--進度條寬度-->
<attr name="progressWidth" format="dimension"/>
</declare-styleable>
</resources>
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- 構造方法中獲取屬性檔案
private void init(Context context, AttributeSet attrs) {
TypedArray typedArray = context.obtainStyledAttributes(attrs, R.styleable.circular);
mDefColor = typedArray.getColor(R.styleable.circular_defColor, Color.parseColor("#9E9E9E"));
mProgressColor = typedArray.getColor(R.styleable.circular_progressColor, Color.parseColor("#FF34A350"));
mTabColor = typedArray.getColor(R.styleable.circular_tabColor, Color.parseColor("#FF34A350"));
mFontColor = typedArray.getColor(R.styleable.circular_fontColor, Color.parseColor("#FF34A350"));
mTipsStr = typedArray.getString(R.styleable.circular_tipsStr);
mStrokeWidthCircle = typedArray.getDimension(R.styleable.circular_progressWidth, 12);
mRectWidth = typedArray.getDimension(R.styleable.circular_rectWidth, 6);
if (TextUtils.isEmpty(mTipsStr)) {
mTipsStr = "下載";
}
mTipsInstallStr = typedArray.getString(R.styleable.circular_finishStr);
if (TextUtils.isEmpty(mTipsInstallStr)) {
mTipsInstallStr = "安裝";
}
mTipsStrFontSize = typedArray.getDimension(R.styleable.circular_fontSize, 40);
typedArray.recycle();
mPaintForCircle = new Paint(Paint.ANTI_ALIAS_FLAG);
mPaintForCircle.setStyle(Paint.Style.STROKE);
mPaintForTag = new Paint(Paint.ANTI_ALIAS_FLAG);
mPaintForDefCircle = new Paint(Paint.ANTI_ALIAS_FLAG);
mPaintForDefCircle.setStyle(Paint.Style.STROKE);
mPaintForText = new Paint(Paint.ANTI_ALIAS_FLAG);
mPaintForText.setTextAlign(Paint.Align.CENTER);
}
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暴露更新進度的方法供外界呼叫:
/**
* 是不是正在顯示進度中
*
* @return
*/
public boolean isInProgress() {
return isDrawProgressBar;
}
/**
* 開始顯示下載進度
*/
public void doStartProgress() {
doDrawProgress();
}
/**
* 暫停下載進度
*/
public void doPauseProgress() {
isDrawProgressBar = false;
doDrawRect();
}
/**
* 完成下載進度
*/
public void doFinishProgress() {
mSweepAngle = 360;
isDrawProgressBar = false;
mTipsStr = mTipsInstallStr;
doDrawRect();
if (mOnProgressListener != null) {
mOnProgressListener.onProgressFinish();
mSweepAngle = 0;
}
}
/**
* 更新進度
*
* @param curProgress 當前進度
* @param maxProgress 全部進度
*/
public void setProgress(int curProgress, int maxProgress) {
if (curProgress < maxProgress) {
BigDecimal result = new BigDecimal(curProgress).divide(new BigDecimal(maxProgress), 2, BigDecimal.ROUND_HALF_DOWN).multiply(new BigDecimal(360));
mSweepAngle = result.intValue();
} else {
mSweepAngle = 360;
}
invalidate();
}
/**
* 預設弧形的顏色
*
* @param colorRgb
*/
public void setDefColor(int colorRgb) {
mDefColor = colorRgb;
}
/**
* 進度條顏色
*
* @param colorRgb
*/
public void setProgressColor(int colorRgb) {
mProgressColor = colorRgb;
}
/**
* 暫停槓槓的顏色
*
* @param colorRgb
*/
public void setTabColor(int colorRgb) {
mTabColor = colorRgb;
}
/**
* 設定進度條寬度
*
* @param progressWidth
*/
public void setProgressWidth(int progressWidth) {
mStrokeWidthCircle = (float) progressWidth;
}
/**
* 設定圓角矩形的寬度
*
* @param rectWidth
*/
public void setRectWidth(int rectWidth) {
mRectWidth = rectWidth;
}
/**
* 設定矩形方框裡面的資訊文字
*
* @param msg
*/
public void setTipsMessage(String msg) {
mTipsStr = msg;
}
/**
* 設定進度走完後顯示的資訊
*
* @param msg
*/
public void setTipsFinish(String msg) {
mTipsInstallStr = msg;
}
/**
* 設定字型大小
*
* @param fontSize
*/
public void setTipsMessageSize(int fontSize) {
mTipsStrFontSize = fontSize;
}
/**
* 設定字型顏色
*
* @param colorRgb
*/
public void setFontColor(int colorRgb) {
mFontColor = colorRgb;
}
/**
* 監聽回撥
*
* @param onProgressListener
*/
public void setOnProgressListener(OnProgressListener onProgressListener) {
mOnProgressListener = onProgressListener;
}
public interface OnProgressListener {
void onProgressFinish();
}
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使用方法:
- xml定義:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:padding="@dimen/padding_10">
<ImageView
android:layout_width="80dp"
android:layout_height="80dp"
android:src="@mipmap/icon"/>
<LinearLayout
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_marginLeft="@dimen/margin_20"
android:layout_weight="1"
android:gravity="center_vertical"
android:orientation="vertical">
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="QQ華夏手遊"
android:textColor="@android:color/black"
android:textSize="@dimen/fonts_18"/>
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="@dimen/margin_4"
android:text="11.8MB"
android:textColor="@android:color/black"
android:textSize="@dimen/fonts_12"/>
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="@dimen/margin_4"
android:text="3000px 超高清體驗"
android:textColor="@android:color/black"
android:textSize="@dimen/fonts_12"/>
</LinearLayout>
<com.playingjoy.fanrabbit.widget.CircularProgressBar
android:id="@+id/cpb_test_progress"
android:layout_width="80dp"
android:layout_height="40dp"
android:layout_gravity="center"
android:layout_marginBottom="8dp"
android:layout_marginEnd="8dp"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
app:defColor="@color/x_red"
app:finishStr="@string/app_name"
app:rectWidth="@dimen/margin_2"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"/>
</LinearLayout>
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- java 定義
public class TestActivity extends RxActivity {
private CircularProgressBar mCircularProgressBar;
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_test);
mCircularProgressBar = findViewById(R.id.cpb_test_progress);
// mCircularProgressBar.setTipsMessage("下載");
// mCircularProgressBar.setDefColor(getResources().getColor(R.color.x_red));
// mCircularProgressBar.setFontColor(getResources().getColor(R.color.x_yellow));
// mCircularProgressBar.setTabColor(getResources().getColor(R.color.x_blue));
// mCircularProgressBar.setProgressColor(getResources().getColor(R.color.colorPrimaryDark));
// mCircularProgressBar.setProgressWidth(4);
// mCircularProgressBar.setRectWidth(1);
// mCircularProgressBar.setTipsFinish("Ly");
mCircularProgressBar.setOnClickListener(v -> {
if (mCircularProgressBar.isInProgress()) {
mCircularProgressBar.doPauseProgress();
} else {
doStartDownLoad();
}
});
}
private void doStartDownLoad() {
mCircularProgressBar.doStartProgress();
io.reactivex.disposables.Disposable disposable = io.reactivex.Observable.interval(1, TimeUnit.SECONDS)
.compose(bindToLifecycle())
.subscribeOn(Schedulers.io())
.observeOn(AndroidSchedulers.mainThread())
.subscribe(aLong -> {
XLog.e("the progress is " + aLong + 1);
if (aLong >= 9) {
mCircularProgressBar.doFinishProgress();
} else {
mCircularProgressBar.setProgress((int) ((aLong + 1) * 10), 100);
}
});
mCircularProgressBar.setOnProgressListener(disposable::dispose);
}
}
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OK,基本就完成了
問題
因為本人也是自定義View初學者,所以很多問題我也不是很清楚是不是會造成問題或者是效能損耗:
- 這樣畫多個圖形來完成頁面會不會有效能損耗?
- 我這邊定義了mPaintForCircle, mPaintForTag, mPaintForDefCircle, mPaintForText四隻畫筆來完成繪圖,會不會太多了呢?是一個圖形對應一個畫筆還是可以複用呢?