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在Android開發中通過使用View實現進度條功能？相信很多沒有經驗的人對此束手無策，為此本文總結了問題出現的原因和解決方法，通過這篇文章希望你能解決這個問題。
1.ProgressBarView1（支持拖動）：
2.ProgressBarView2（不同進度值顯示不同顏色，不支持拖拽）：
代碼不多，注釋也比較詳細，全部貼上了：
（一）ProgressBarView1:
/**
* 自定義絢麗的ProgressBar.
*/
public class ProgressBarView1 extends View {
/**
* 進度條所占用的角度
*/
private static final int ARC_FULL_DEGREE = 300;
/**
* 弧線的寬度
*/
private int STROKE_WIDTH;
/**
* 組件的寬，高
*/
private int width, height;
/**
* 進度條最大值和當前進度值
*/
private float max, progress;
/**
* 是否允許拖動進度條
*/
private boolean draggingEnabled = false;
/**
* 繪制弧線的矩形區域
*/
private RectF circleRectF;
/**
* 繪制弧線的畫筆
*/
private Paint progressPaint;
/**
* 繪制文字的畫筆
*/
private Paint textPaint;
/**
* 繪制當前進度值的畫筆
*/
private Paint thumbPaint;
/**
* 圓弧的半徑
*/
private int circleRadius;
/**
* 圓弧圓心位置
*/
private int centerX, centerY;
public ProgressBarView1(Context context) {
super(context);
init();
}
public ProgressBarView1(Context context, AttributeSet attrs) {
super(context, attrs);
init();
}
public ProgressBarView1(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
init();
}
private void init() {
progressPaint = new Paint();
progressPaint.setAntiAlias(true);
textPaint = new Paint();
textPaint.setColor(Color.WHITE);
textPaint.setAntiAlias(true);
thumbPaint = new Paint();
thumbPaint.setAntiAlias(true);
//使用自定義字體
textPaint.setTypeface(Typeface.createFromAsset(getContext().getAssets(), "fangz.ttf"));
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
if (width == 0 || height == 0) {
width = getWidth();
height = getHeight();
//計算圓弧半徑和圓心點
circleRadius = Math.min(width, height) / 2;
STROKE_WIDTH = circleRadius / 12;
circleRadius -= STROKE_WIDTH;
centerX = width / 2;
centerY = height / 2;
//圓弧所在矩形區域
circleRectF = new RectF();
circleRectF.left = centerX - circleRadius;
circleRectF.top = centerY - circleRadius;
circleRectF.right = centerX + circleRadius;
circleRectF.bottom = centerY + circleRadius;
}
}
private Rect textBounds = new Rect();
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
float start = 90 + ((360 - ARC_FULL_DEGREE) >> 1); //進度條起始點
float sweep1 = ARC_FULL_DEGREE * (progress / max); //進度劃過的角度
float sweep2 = ARC_FULL_DEGREE - sweep1; //剩余的角度
//繪制起始位置小圓形
progressPaint.setColor(Color.WHITE);
progressPaint.setStrokeWidth(0);
progressPaint.setStyle(Paint.Style.FILL);
float radians = (float) (((360.0f - ARC_FULL_DEGREE) / 2) / 180 * Math.PI);
float startX = centerX - circleRadius * (float) Math.sin(radians);
float startY = centerY + circleRadius * (float) Math.cos(radians);
canvas.drawCircle(startX, startY, STROKE_WIDTH / 2, progressPaint);
//繪制進度條
progressPaint.setStrokeWidth(STROKE_WIDTH);
progressPaint.setStyle(Paint.Style.STROKE);//設置空心
canvas.drawArc(circleRectF, start, sweep1, false, progressPaint);
//繪制進度條背景
progressPaint.setColor(Color.parseColor("#d64444"));
canvas.drawArc(circleRectF, start + sweep1, sweep2, false, progressPaint);
//繪制結束位置小圓形
progressPaint.setStrokeWidth(0);
progressPaint.setStyle(Paint.Style.FILL);
float endX = centerX + circleRadius * (float) Math.sin(radians);
float endY = centerY + circleRadius * (float) Math.cos(radians);
canvas.drawCircle(endX, endY, STROKE_WIDTH / 2, progressPaint);
//上一行文字
textPaint.setTextSize(circleRadius >> 1);
String text = (int) (100 * progress / max) + "";
float textLen = textPaint.measureText(text);
//計算文字高度
textPaint.getTextBounds("8", 0, 1, textBounds);
float h2 = textBounds.height();
//% 前面的數字水平居中，適當調整
float extra = text.startsWith("1") ? -textPaint.measureText("1") / 2 : 0;
canvas.drawText(text, centerX - textLen / 2 + extra, centerY - 30 + h2 / 2, textPaint);
//百分號
textPaint.setTextSize(circleRadius >> 2);
canvas.drawText("%", centerX + textLen / 2 + extra + 5, centerY - 30 + h2 / 2, textPaint);
//下一行文字
textPaint.setTextSize(circleRadius / 5);
text = "可用內存充足";
textLen = textPaint.measureText(text);
textPaint.getTextBounds(text, 0, text.length(), textBounds);
float h3 = textBounds.height();
canvas.drawText(text, centerX - textLen / 2, centerY + h2 / 2 + h3, textPaint);
//繪制進度位置，也可以直接替換成一張圖片
float progressRadians = (float) (((360.0f - ARC_FULL_DEGREE) / 2 + sweep1) / 180 * Math.PI);
float thumbX = centerX - circleRadius * (float) Math.sin(progressRadians);
float thumbY = centerY + circleRadius * (float) Math.cos(progressRadians);
thumbPaint.setColor(Color.parseColor("#33d64444"));
canvas.drawCircle(thumbX, thumbY, STROKE_WIDTH * 2.0f, thumbPaint);
thumbPaint.setColor(Color.parseColor("#99d64444"));
canvas.drawCircle(thumbX, thumbY, STROKE_WIDTH * 1.4f, thumbPaint);
thumbPaint.setColor(Color.WHITE);
canvas.drawCircle(thumbX, thumbY, STROKE_WIDTH * 0.8f, thumbPaint);
}
private boolean isDragging = false;
@Override
public boolean onTouchEvent(@NonNull MotionEvent event) {
if (!draggingEnabled) {
return super.onTouchEvent(event);
}
//處理拖動事件
float currentX = event.getX();
float currentY = event.getY();
int action = event.getAction();
switch (action) {
case MotionEvent.ACTION_DOWN:
//判斷是否在進度條thumb位置
if (checkOnArc(currentX, currentY)) {
float newProgress = calDegreeByPosition(currentX, currentY) / ARC_FULL_DEGREE * max;
setProgressSync(newProgress);
isDragging = true;
}
break;
case MotionEvent.ACTION_MOVE:
if (isDragging) {
//判斷拖動時是否移出去了
if (checkOnArc(currentX, currentY)) {
setProgressSync(calDegreeByPosition(currentX, currentY) / ARC_FULL_DEGREE * max);
} else {
isDragging = false;
}
}
break;
case MotionEvent.ACTION_UP:
isDragging = false;
break;
}
return true;
}
private float calDistance(float x1, float y1, float x2, float y2) {
return (float) Math.sqrt((x1 - x2) * (x1 - x2) + (y1 - y2) * (y1 - y2));
}
/**
* 判斷該點是否在弧線上（附近）
*/
private boolean checkOnArc(float currentX, float currentY) {
float distance = calDistance(currentX, currentY, centerX, centerY);
float degree = calDegreeByPosition(currentX, currentY);
return distance > circleRadius - STROKE_WIDTH * 5 && distance < circleRadius + STROKE_WIDTH * 5
&& (degree >= -8 && degree <= ARC_FULL_DEGREE + 8);
}
/**
* 根據當前位置，計算出進度條已經轉過的角度。
*/
private float calDegreeByPosition(float currentX, float currentY) {
float a1 = (float) (Math.atan(1.0f * (centerX - currentX) / (currentY - centerY)) / Math.PI * 180);
if (currentY < centerY) {
a1 += 180;
} else if (currentY > centerY && currentX > centerX) {
a1 += 360;
}
return a1 - (360 - ARC_FULL_DEGREE) / 2;
}
public void setMax(int max) {
this.max = max;
invalidate();
}
public void setProgress(float progress) {
final float validProgress = checkProgress(progress);
//動畫切換進度值
new Thread(new Runnable() {
@Override
public void run() {
float oldProgress = ProgressBarView1.this.progress;
for (int i = 1; i <= 100; i++) {
ProgressBarView1.this.progress = oldProgress + (validProgress - oldProgress) * (1.0f * i / 100);
postInvalidate();
SystemClock.sleep(20);
}
}
}).start();
}
public void setProgressSync(float progress) {
this.progress = checkProgress(progress);
invalidate();
}
//保證progress的值位于[0,max]
private float checkProgress(float progress) {
if (progress < 0) {
return 0;
}
return progress > max ? max : progress;
}
public void setDraggingEnabled(boolean draggingEnabled) {
this.draggingEnabled = draggingEnabled;
}
}（二）ProgressBarView2:
/**
* 自定義絢麗的ProgressBar.
*/
public class ProgressBarView2 extends View {
/**
* 進度條所占用的角度
*/
private static final int ARC_FULL_DEGREE = 300;
//進度條個數
private static final int COUNT = 100;
//每個進度條所占用角度
private static final float ARC_EACH_PROGRESS = ARC_FULL_DEGREE * 1.0f / (COUNT - 1);
/**
* 弧線細線條的長度
*/
private int ARC_LINE_LENGTH;
/**
* 弧線細線條的寬度
*/
private int ARC_LINE_WIDTH;
/**
* 組件的寬，高
*/
private int width, height;
/**
* 進度條最大值和當前進度值
*/
private float max, progress;
/**
* 繪制弧線的畫筆
*/
private Paint progressPaint;
/**
* 繪制文字的畫筆
*/
private Paint textPaint;
/**
* 繪制文字背景圓形的畫筆
*/
private Paint textBgPaint;
/**
* 圓弧的半徑
*/
private int circleRadius;
/**
* 圓弧圓心位置
*/
private int centerX, centerY;
public ProgressBarView2(Context context) {
super(context);
init();
}
public ProgressBarView2(Context context, AttributeSet attrs) {
super(context, attrs);
init();
}
public ProgressBarView2(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
init();
}
private void init() {
progressPaint = new Paint();
progressPaint.setAntiAlias(true);
textPaint = new Paint();
textPaint.setColor(Color.WHITE);
textPaint.setAntiAlias(true);
textBgPaint = new Paint();
textBgPaint.setAntiAlias(true);
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
if (width == 0 || height == 0) {
width = getWidth();
height = getHeight();
//計算圓弧半徑和圓心點
circleRadius = Math.min(width, height) / 2;
ARC_LINE_LENGTH = circleRadius / 6;
ARC_LINE_WIDTH = ARC_LINE_LENGTH / 8;
centerX = width / 2;
centerY = height / 2;
}
}
private Rect textBounds = new Rect();
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
float start = (360 - ARC_FULL_DEGREE) >> 1; //進度條起始角度
float sweep1 = ARC_FULL_DEGREE * (progress / max); //進度劃過的角度
//繪制進度條
progressPaint.setColor(Color.parseColor(calColor(progress / max, "#ffff0000", "#ff00ff00")));
progressPaint.setStrokeWidth(ARC_LINE_WIDTH);
float drawDegree = 1.6f;
while (drawDegree <= ARC_FULL_DEGREE) {
double a = (start + drawDegree) / 180 * Math.PI;
float lineStartX = centerX - circleRadius * (float) Math.sin(a);
float lineStartY = centerY + circleRadius * (float) Math.cos(a);
float lineStopX = lineStartX + ARC_LINE_LENGTH * (float) Math.sin(a);
float lineStopY = lineStartY - ARC_LINE_LENGTH * (float) Math.cos(a);
if (drawDegree > sweep1) {
//繪制進度條背景
progressPaint.setColor(Color.parseColor("#88aaaaaa"));
progressPaint.setStrokeWidth(ARC_LINE_WIDTH >> 1);
}
canvas.drawLine(lineStartX, lineStartY, lineStopX, lineStopY, progressPaint);
drawDegree += ARC_EACH_PROGRESS;
}
//繪制文字背景圓形
textBgPaint.setStyle(Paint.Style.FILL);//設置填充
textBgPaint.setColor(Color.parseColor("#41668b"));
canvas.drawCircle(centerX, centerY, (circleRadius - ARC_LINE_LENGTH) * 0.8f, textBgPaint);
textBgPaint.setStyle(Paint.Style.STROKE);//設置空心
textBgPaint.setStrokeWidth(2);
textBgPaint.setColor(Color.parseColor("#aaaaaaaa"));
canvas.drawCircle(centerX, centerY, (circleRadius - ARC_LINE_LENGTH) * 0.8f, textBgPaint);
//上一行文字
textPaint.setTextSize(circleRadius >> 1);
String text = (int) (100 * progress / max) + "";
float textLen = textPaint.measureText(text);
//計算文字高度
textPaint.getTextBounds("8", 0, 1, textBounds);
float h2 = textBounds.height();
canvas.drawText(text, centerX - textLen / 2, centerY - circleRadius / 10 + h2 / 2, textPaint);
//分
textPaint.setTextSize(circleRadius >> 3);
textPaint.getTextBounds("分", 0, 1, textBounds);
float h21 = textBounds.height();
canvas.drawText("分", centerX + textLen / 2 + 5, centerY - circleRadius / 10 + h2 / 2 - (h2 - h21), textPaint);
//下一行文字
textPaint.setTextSize(circleRadius / 6);
text = "點擊優化";
textLen = textPaint.measureText(text);
canvas.drawText(text, centerX - textLen / 2, centerY + circleRadius / 2.5f, textPaint);
}
public void setMax(int max) {
this.max = max;
invalidate();
}
//動畫切換進度值(異步)
public void setProgress(final float progress) {
new Thread(new Runnable() {
@Override
public void run() {
float oldProgress = ProgressBarView2.this.progress;
for (int i = 1; i <= 100; i++) {
ProgressBarView2.this.progress = oldProgress + (progress - oldProgress) * (1.0f * i / 100);
postInvalidate();
SystemClock.sleep(20);
}
}
}).start();
}
//直接設置進度值（同步）
public void setProgressSync(float progress) {
this.progress = progress;
invalidate();
}
/**
* 計算漸變效果中間的某個顏色值。
* 僅支持 #aarrggbb 模式,例如 #ccc9c9b2
*/
public String calColor(float fraction, String startValue, String endValue) {
int start_a, start_r, start_g, start_b;
int end_a, end_r, end_g, end_b;
//start
start_a = getIntValue(startValue, 1, 3);
start_r = getIntValue(startValue, 3, 5);
start_g = getIntValue(startValue, 5, 7);
start_b = getIntValue(startValue, 7, 9);
//end
end_a = getIntValue(endValue, 1, 3);
end_r = getIntValue(endValue, 3, 5);
end_g = getIntValue(endValue, 5, 7);
end_b = getIntValue(endValue, 7, 9);
return "#" + getHexString((int) (start_a + fraction * (end_a - start_a)))
+ getHexString((int) (start_r + fraction * (end_r - start_r)))
+ getHexString((int) (start_g + fraction * (end_g - start_g)))
+ getHexString((int) (start_b + fraction * (end_b - start_b)));
}
//從原始#AARRGGBB顏色值中指定位置截取，并轉為int.
private int getIntValue(String hexValue, int start, int end) {
return Integer.parseInt(hexValue.substring(start, end), 16);
}
private String getHexString(int value) {
String a = Integer.toHexString(value);
if (a.length() == 1) {
a = "0" + a;
}
return a;
}
}看完上述內容，你們掌握在Android開發中通過使用View實現進度條功能的方法了嗎？如果還想學到更多技能或想了解更多相關內容，歡迎關注億速云行業資訊頻道，感謝各位的閱讀！
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