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這篇文章將為大家詳細講解有關Android如何實現簡單的加載進度條，小編覺得挺實用的，因此分享給大家做個參考，希望大家閱讀完這篇文章后可以有所收獲。
Android是一種基于Linux內核的自由及開放源代碼的操作系統，主要使用于移動設備，如智能手機和平板電腦，由美國Google公司和開放手機聯盟領導及開發。
1.效果圖
2.自定義progressBar
package com.example.myapplication7;
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.RectF;
import android.os.Bundle;
import android.os.Parcelable;
import android.util.AttributeSet;
import android.view.animation.AccelerateDecelerateInterpolator;
import android.widget.ProgressBar;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import androidx.annotation.IntDef;
public class CircleProgressView extends ProgressBar {
private int mReachBarSize = Utils.dp2px(getContext(), 2); // 未完成進度條大小
private int mNormalBarSize = Utils.dp2px(getContext(), 2); // 未完成進度條大小
private int mReachBarColor = Color.parseColor("#108ee9"); // 已完成進度顏色
private int mNormalBarColor = Color.parseColor("#FFD3D6DA"); // 未完成進度顏色
private int mTextSize = Utils.sp2px(getContext(), 14); // 進度值字體大小
private int mTextColor = Color.parseColor("#108ee9"); // 進度的值字體顏色
private float mTextSkewX; // 進度值字體傾斜角度
private String mTextSuffix = "%"; // 進度值前綴
private String mTextPrefix = ""; // 進度值后綴
private boolean mTextVisible = true; // 是否顯示進度值
private boolean mReachCapRound; // 畫筆是否使用圓角邊界，normalStyle下生效
private int mRadius = Utils.dp2px(getContext(), 20); // 半徑
private int mStartArc; // 起始角度
private int mInnerBackgroundColor; // 內部背景填充顏色
private int mProgressStyle = ProgressStyle.NORMAL; // 進度風格
private int mInnerPadding = Utils.dp2px(getContext(), 1); // 內部圓與外部圓間距
private int mOuterColor; // 外部圓環顏色
private boolean needDrawInnerBackground; // 是否需要繪制內部背景
private RectF rectF; // 外部圓環繪制區域
private RectF rectInner; // 內部圓環繪制區域
private int mOuterSize = Utils.dp2px(getContext(), 1); // 外層圓環寬度
private Paint mTextPaint; // 繪制進度值字體畫筆
private Paint mNormalPaint; // 繪制未完成進度畫筆
private Paint mReachPaint; // 繪制已完成進度畫筆
private Paint mInnerBackgroundPaint; // 內部背景畫筆
private Paint mOutPaint; // 外部圓環畫筆
private int mRealWidth;
private int mRealHeight;
@IntDef({ProgressStyle.NORMAL, ProgressStyle.FILL_IN, ProgressStyle.FILL_IN_ARC})
@Retention(RetentionPolicy.SOURCE)
public @interface ProgressStyle {
int NORMAL = 0;
int FILL_IN = 1;
int FILL_IN_ARC = 2;
}
public CircleProgressView(Context context) {
this(context, null);
}
public CircleProgressView(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public CircleProgressView(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
obtainAttributes(attrs);
initPaint();
}
private void initPaint() {
mTextPaint = new Paint();
mTextPaint.setColor(mTextColor);
mTextPaint.setStyle(Paint.Style.FILL);
mTextPaint.setTextSize(mTextSize);
mTextPaint.setTextSkewX(mTextSkewX);
mTextPaint.setAntiAlias(true);
mNormalPaint = new Paint();
mNormalPaint.setColor(mNormalBarColor);
mNormalPaint.setStyle(mProgressStyle == ProgressStyle.FILL_IN_ARC ? Paint.Style.FILL : Paint.Style.STROKE);
mNormalPaint.setAntiAlias(true);
mNormalPaint.setStrokeWidth(mNormalBarSize);
mReachPaint = new Paint();
mReachPaint.setColor(mReachBarColor);
mReachPaint.setStyle(mProgressStyle == ProgressStyle.FILL_IN_ARC ? Paint.Style.FILL : Paint.Style.STROKE);
mReachPaint.setAntiAlias(true);
mReachPaint.setStrokeCap(mReachCapRound ? Paint.Cap.ROUND : Paint.Cap.BUTT);
mReachPaint.setStrokeWidth(mReachBarSize);
if (needDrawInnerBackground) {
mInnerBackgroundPaint = new Paint();
mInnerBackgroundPaint.setStyle(Paint.Style.FILL);
mInnerBackgroundPaint.setAntiAlias(true);
mInnerBackgroundPaint.setColor(mInnerBackgroundColor);
}
if (mProgressStyle == ProgressStyle.FILL_IN_ARC) {
mOutPaint = new Paint();
mOutPaint.setStyle(Paint.Style.STROKE);
mOutPaint.setColor(mOuterColor);
mOutPaint.setStrokeWidth(mOuterSize);
mOutPaint.setAntiAlias(true);
}
}
private void obtainAttributes(AttributeSet attrs) {
TypedArray ta = getContext().obtainStyledAttributes(attrs, R.styleable.CircleProgressView);
mProgressStyle = ta.getInt(R.styleable.CircleProgressView_cpv_progressStyle, ProgressStyle.NORMAL);
// 獲取三種風格通用的屬性
mNormalBarSize = (int) ta.getDimension(R.styleable.CircleProgressView_cpv_progressNormalSize, mNormalBarSize);
mNormalBarColor = ta.getColor(R.styleable.CircleProgressView_cpv_progressNormalColor, mNormalBarColor);
mReachBarSize = (int) ta.getDimension(R.styleable.CircleProgressView_cpv_progressReachSize, mReachBarSize);
mReachBarColor = ta.getColor(R.styleable.CircleProgressView_cpv_progressReachColor, mReachBarColor);
mTextSize = (int) ta.getDimension(R.styleable.CircleProgressView_cpv_progressTextSize, mTextSize);
mTextColor = ta.getColor(R.styleable.CircleProgressView_cpv_progressTextColor, mTextColor);
mTextSkewX = ta.getDimension(R.styleable.CircleProgressView_cpv_progressTextSkewX, 0);
if (ta.hasValue(R.styleable.CircleProgressView_cpv_progressTextSuffix)) {
mTextSuffix = ta.getString(R.styleable.CircleProgressView_cpv_progressTextSuffix);
}
if (ta.hasValue(R.styleable.CircleProgressView_cpv_progressTextPrefix)) {
mTextPrefix = ta.getString(R.styleable.CircleProgressView_cpv_progressTextPrefix);
}
mTextVisible = ta.getBoolean(R.styleable.CircleProgressView_cpv_progressTextVisible, mTextVisible);
mRadius = (int) ta.getDimension(R.styleable.CircleProgressView_cpv_radius, mRadius);
rectF = new RectF(-mRadius, -mRadius, mRadius, mRadius);
switch (mProgressStyle) {
case ProgressStyle.FILL_IN:
mReachBarSize = 0;
mNormalBarSize = 0;
mOuterSize = 0;
break;
case ProgressStyle.FILL_IN_ARC:
mStartArc = ta.getInt(R.styleable.CircleProgressView_cpv_progressStartArc, 0) + 270;
mInnerPadding = (int) ta.getDimension(R.styleable.CircleProgressView_cpv_innerPadding, mInnerPadding);
mOuterColor = ta.getColor(R.styleable.CircleProgressView_cpv_outerColor, mReachBarColor);
mOuterSize = (int) ta.getDimension(R.styleable.CircleProgressView_cpv_outerSize, mOuterSize);
mReachBarSize = 0;// 將畫筆大小重置為0
mNormalBarSize = 0;
if (!ta.hasValue(R.styleable.CircleProgressView_cpv_progressNormalColor)) {
mNormalBarColor = Color.TRANSPARENT;
}
int mInnerRadius = mRadius - mOuterSize / 2 - mInnerPadding;
rectInner = new RectF(-mInnerRadius, -mInnerRadius, mInnerRadius, mInnerRadius);
break;
case ProgressStyle.NORMAL:
mReachCapRound = ta.getBoolean(R.styleable.CircleProgressView_cpv_reachCapRound, true);
mStartArc = ta.getInt(R.styleable.CircleProgressView_cpv_progressStartArc, 0) + 270;
if (ta.hasValue(R.styleable.CircleProgressView_cpv_innerBackgroundColor)) {
mInnerBackgroundColor = ta.getColor(R.styleable.CircleProgressView_cpv_innerBackgroundColor, Color.argb(0, 0, 0, 0));
needDrawInnerBackground = true;
}
break;
}
ta.recycle();
}
@Override
protected synchronized void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
int maxBarPaintWidth = Math.max(mReachBarSize, mNormalBarSize);
int maxPaintWidth = Math.max(maxBarPaintWidth, mOuterSize);
int height = 0;
int width = 0;
switch (mProgressStyle) {
case ProgressStyle.FILL_IN:
height = getPaddingTop() + getPaddingBottom() // 邊距
+ Math.abs(mRadius * 2); // 直徑
width = getPaddingLeft() + getPaddingRight() // 邊距
+ Math.abs(mRadius * 2); // 直徑
break;
case ProgressStyle.FILL_IN_ARC:
height = getPaddingTop() + getPaddingBottom() // 邊距
+ Math.abs(mRadius * 2) // 直徑
+ maxPaintWidth;// 邊框
width = getPaddingLeft() + getPaddingRight() // 邊距
+ Math.abs(mRadius * 2) // 直徑
+ maxPaintWidth;// 邊框
break;
case ProgressStyle.NORMAL:
height = getPaddingTop() + getPaddingBottom() // 邊距
+ Math.abs(mRadius * 2) // 直徑
+ maxBarPaintWidth;// 邊框
width = getPaddingLeft() + getPaddingRight() // 邊距
+ Math.abs(mRadius * 2) // 直徑
+ maxBarPaintWidth;// 邊框
break;
}
mRealWidth = resolveSize(width, widthMeasureSpec);
mRealHeight = resolveSize(height, heightMeasureSpec);
setMeasuredDimension(mRealWidth, mRealHeight);
}
@Override
protected synchronized void onDraw(Canvas canvas) {
switch (mProgressStyle) {
case ProgressStyle.NORMAL:
drawNormalCircle(canvas);
break;
case ProgressStyle.FILL_IN:
drawFillInCircle(canvas);
break;
case ProgressStyle.FILL_IN_ARC:
drawFillInArcCircle(canvas);
break;
}
}
/**
* 繪制PROGRESS_STYLE_FILL_IN_ARC圓形
*/
private void drawFillInArcCircle(Canvas canvas) {
canvas.save();
canvas.translate(mRealWidth / 2, mRealHeight / 2);
// 繪制外層圓環
canvas.drawArc(rectF, 0, 360, false, mOutPaint);
// 繪制內層進度實心圓弧
// 內層圓弧半徑
float reachArc = getProgress() * 1.0f / getMax() * 360;
canvas.drawArc(rectInner, mStartArc, reachArc, true, mReachPaint);
// 繪制未到達進度
if (reachArc != 360) {
canvas.drawArc(rectInner, reachArc + mStartArc, 360 - reachArc, true, mNormalPaint);
}
canvas.restore();
}
/**
* 繪制PROGRESS_STYLE_FILL_IN圓形
*/
private void drawFillInCircle(Canvas canvas) {
canvas.save();
canvas.translate(mRealWidth / 2, mRealHeight / 2);
float progressY = getProgress() * 1.0f / getMax() * (mRadius * 2);
float angle = (float) (Math.acos((mRadius - progressY) / mRadius) * 180 / Math.PI);
float startAngle = 90 + angle;
float sweepAngle = 360 - angle * 2;
// 繪制未到達區域
rectF = new RectF(-mRadius, -mRadius, mRadius, mRadius);
mNormalPaint.setStyle(Paint.Style.FILL);
canvas.drawArc(rectF, startAngle, sweepAngle, false, mNormalPaint);
// 翻轉180度繪制已到達區域
canvas.rotate(180);
mReachPaint.setStyle(Paint.Style.FILL);
canvas.drawArc(rectF, 270 - angle, angle * 2, false, mReachPaint);
// 文字顯示在最上層最后繪制
canvas.rotate(180);
// 繪制文字
if (mTextVisible) {
String text = mTextPrefix + getProgress() + mTextSuffix;
float textWidth = mTextPaint.measureText(text);
float textHeight = (mTextPaint.descent() + mTextPaint.ascent());
canvas.drawText(text, -textWidth / 2, -textHeight / 2, mTextPaint);
}
}
/**
* 繪制PROGRESS_STYLE_NORMAL圓形
*/
private void drawNormalCircle(Canvas canvas) {
canvas.save();
canvas.translate(mRealWidth / 2, mRealHeight / 2);
// 繪制內部圓形背景色
if (needDrawInnerBackground) {
canvas.drawCircle(0, 0, mRadius - Math.min(mReachBarSize, mNormalBarSize) / 2,
mInnerBackgroundPaint);
}
// 繪制文字
if (mTextVisible) {
String text = mTextPrefix + getProgress() + mTextSuffix;
float textWidth = mTextPaint.measureText(text);
float textHeight = (mTextPaint.descent() + mTextPaint.ascent());
canvas.drawText(text, -textWidth / 2, -textHeight / 2, mTextPaint);
}
// 計算進度值
float reachArc = getProgress() * 1.0f / getMax() * 360;
// 繪制未到達進度
if (reachArc != 360) {
canvas.drawArc(rectF, reachArc + mStartArc, 360 - reachArc, false, mNormalPaint);
}
// 繪制已到達進度
canvas.drawArc(rectF, mStartArc, reachArc, false, mReachPaint);
canvas.restore();
}
/**
* 動畫進度(0-當前進度)
*
* @param duration 動畫時長
*/
public void runProgressAnim(long duration) {
setProgressInTime(0, duration);
}
/**
* @param progress 進度值
* @param duration 動畫播放時間
*/
public void setProgressInTime(final int progress, final long duration) {
setProgressInTime(progress, getProgress(), duration);
}
/**
* @param startProgress 起始進度
* @param progress 進度值
* @param duration 動畫播放時間
*/
public void setProgressInTime(int startProgress, final int progress, final long duration) {
ValueAnimator valueAnimator = ValueAnimator.ofInt(startProgress, progress);
valueAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
@Override
public void onAnimationUpdate(ValueAnimator animator) {
//獲得當前動畫的進度值，整型，1-100之間
int currentValue = (Integer) animator.getAnimatedValue();
setProgress(currentValue);
}
});
AccelerateDecelerateInterpolator interpolator = new AccelerateDecelerateInterpolator();
valueAnimator.setInterpolator(interpolator);
valueAnimator.setDuration(duration);
valueAnimator.start();
}
public int getReachBarSize() {
return mReachBarSize;
}
public void setReachBarSize(int reachBarSize) {
mReachBarSize = Utils.dp2px(getContext(), reachBarSize);
invalidate();
}
public int getNormalBarSize() {
return mNormalBarSize;
}
public void setNormalBarSize(int normalBarSize) {
mNormalBarSize = Utils.dp2px(getContext(), normalBarSize);
invalidate();
}
public int getReachBarColor() {
return mReachBarColor;
}
public void setReachBarColor(int reachBarColor) {
mReachBarColor = reachBarColor;
invalidate();
}
public int getNormalBarColor() {
return mNormalBarColor;
}
public void setNormalBarColor(int normalBarColor) {
mNormalBarColor = normalBarColor;
invalidate();
}
public int getTextSize() {
return mTextSize;
}
public void setTextSize(int textSize) {
mTextSize = Utils.sp2px(getContext(), textSize);
invalidate();
}
public int getTextColor() {
return mTextColor;
}
public void setTextColor(int textColor) {
mTextColor = textColor;
invalidate();
}
public float getTextSkewX() {
return mTextSkewX;
}
public void setTextSkewX(float textSkewX) {
mTextSkewX = textSkewX;
invalidate();
}
public String getTextSuffix() {
return mTextSuffix;
}
public void setTextSuffix(String textSuffix) {
mTextSuffix = textSuffix;
invalidate();
}
public String getTextPrefix() {
return mTextPrefix;
}
public void setTextPrefix(String textPrefix) {
mTextPrefix = textPrefix;
invalidate();
}
public boolean isTextVisible() {
return mTextVisible;
}
public void setTextVisible(boolean textVisible) {
mTextVisible = textVisible;
invalidate();
}
public boolean isReachCapRound() {
return mReachCapRound;
}
public void setReachCapRound(boolean reachCapRound) {
mReachCapRound = reachCapRound;
invalidate();
}
public int getRadius() {
return mRadius;
}
public void setRadius(int radius) {
mRadius = Utils.dp2px(getContext(), radius);
invalidate();
}
public int getStartArc() {
return mStartArc;
}
public void setStartArc(int startArc) {
mStartArc = startArc;
invalidate();
}
public int getInnerBackgroundColor() {
return mInnerBackgroundColor;
}
public void setInnerBackgroundColor(int innerBackgroundColor) {
mInnerBackgroundColor = innerBackgroundColor;
invalidate();
}
public int getProgressStyle() {
return mProgressStyle;
}
public void setProgressStyle(int progressStyle) {
mProgressStyle = progressStyle;
invalidate();
}
public int getInnerPadding() {
return mInnerPadding;
}
public void setInnerPadding(int innerPadding) {
mInnerPadding = Utils.dp2px(getContext(), innerPadding);
int mInnerRadius = mRadius - mOuterSize / 2 - mInnerPadding;
rectInner = new RectF(-mInnerRadius, -mInnerRadius, mInnerRadius, mInnerRadius);
invalidate();
}
public int getOuterColor() {
return mOuterColor;
}
public void setOuterColor(int outerColor) {
mOuterColor = outerColor;
invalidate();
}
public int getOuterSize() {
return mOuterSize;
}
public void setOuterSize(int outerSize) {
mOuterSize = Utils.dp2px(getContext(), outerSize);
invalidate();
}
private static final String STATE = "state";
private static final String PROGRESS_STYLE = "progressStyle";
private static final String TEXT_COLOR = "textColor";
private static final String TEXT_SIZE = "textSize";
private static final String TEXT_SKEW_X = "textSkewX";
private static final String TEXT_VISIBLE = "textVisible";
private static final String TEXT_SUFFIX = "textSuffix";
private static final String TEXT_PREFIX = "textPrefix";
private static final String REACH_BAR_COLOR = "reachBarColor";
private static final String REACH_BAR_SIZE = "reachBarSize";
private static final String NORMAL_BAR_COLOR = "normalBarColor";
private static final String NORMAL_BAR_SIZE = "normalBarSize";
private static final String IS_REACH_CAP_ROUND = "isReachCapRound";
private static final String RADIUS = "radius";
private static final String START_ARC = "startArc";
private static final String INNER_BG_COLOR = "innerBgColor";
private static final String INNER_PADDING = "innerPadding";
private static final String OUTER_COLOR = "outerColor";
private static final String OUTER_SIZE = "outerSize";
@Override
public Parcelable onSaveInstanceState() {
final Bundle bundle = new Bundle();
bundle.putParcelable(STATE, super.onSaveInstanceState());
// 保存當前樣式
bundle.putInt(PROGRESS_STYLE, getProgressStyle());
bundle.putInt(RADIUS, getRadius());
bundle.putBoolean(IS_REACH_CAP_ROUND, isReachCapRound());
bundle.putInt(START_ARC, getStartArc());
bundle.putInt(INNER_BG_COLOR, getInnerBackgroundColor());
bundle.putInt(INNER_PADDING, getInnerPadding());
bundle.putInt(OUTER_COLOR, getOuterColor());
bundle.putInt(OUTER_SIZE, getOuterSize());
// 保存text信息
bundle.putInt(TEXT_COLOR, getTextColor());
bundle.putInt(TEXT_SIZE, getTextSize());
bundle.putFloat(TEXT_SKEW_X, getTextSkewX());
bundle.putBoolean(TEXT_VISIBLE, isTextVisible());
bundle.putString(TEXT_SUFFIX, getTextSuffix());
bundle.putString(TEXT_PREFIX, getTextPrefix());
// 保存已到達進度信息
bundle.putInt(REACH_BAR_COLOR, getReachBarColor());
bundle.putInt(REACH_BAR_SIZE, getReachBarSize());
// 保存未到達進度信息
bundle.putInt(NORMAL_BAR_COLOR, getNormalBarColor());
bundle.putInt(NORMAL_BAR_SIZE, getNormalBarSize());
return bundle;
}
@Override
public void onRestoreInstanceState(Parcelable state) {
if (state instanceof Bundle) {
final Bundle bundle = (Bundle) state;
mProgressStyle = bundle.getInt(PROGRESS_STYLE);
mRadius = bundle.getInt(RADIUS);
mReachCapRound = bundle.getBoolean(IS_REACH_CAP_ROUND);
mStartArc = bundle.getInt(START_ARC);
mInnerBackgroundColor = bundle.getInt(INNER_BG_COLOR);
mInnerPadding = bundle.getInt(INNER_PADDING);
mOuterColor = bundle.getInt(OUTER_COLOR);
mOuterSize = bundle.getInt(OUTER_SIZE);
mTextColor = bundle.getInt(TEXT_COLOR);
mTextSize = bundle.getInt(TEXT_SIZE);
mTextSkewX = bundle.getFloat(TEXT_SKEW_X);
mTextVisible = bundle.getBoolean(TEXT_VISIBLE);
mTextSuffix = bundle.getString(TEXT_SUFFIX);
mTextPrefix = bundle.getString(TEXT_PREFIX);
mReachBarColor = bundle.getInt(REACH_BAR_COLOR);
mReachBarSize = bundle.getInt(REACH_BAR_SIZE);
mNormalBarColor = bundle.getInt(NORMAL_BAR_COLOR);
mNormalBarSize = bundle.getInt(NORMAL_BAR_SIZE);
initPaint();
super.onRestoreInstanceState(bundle.getParcelable(STATE));
return;
}
super.onRestoreInstanceState(state);
}
@Override
public void invalidate() {
initPaint();
super.invalidate();
}
}3.設置寬高
package com.example.myapplication7;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.RectF;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.text.TextUtils;
import android.util.DisplayMetrics;
import android.view.WindowManager;
import java.util.Collection;
import androidx.annotation.ColorRes;
public class Utils {
private static WindowManager windowManager;
private static WindowManager getWindowManager(Context context) {
if (windowManager == null) {
windowManager = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
}
return windowManager;
}
public static float getDensity(Context context) {
return context.getResources().getDisplayMetrics().density;
}
public static float getFontDensity(Context context) {
return context.getResources().getDisplayMetrics().scaledDensity;
}
public static DisplayMetrics getDisplayMetrics(Context context) {
DisplayMetrics displayMetrics = new DisplayMetrics();
getWindowManager(context).getDefaultDisplay().getMetrics(displayMetrics);
return displayMetrics;
}
public static int dp2px(Context context, float dp) {
return (int) (getDensity(context) * dp + 0.5f);
}
public static int px2dp(Context context, float px) {
return (int) (px / getDensity(context) + 0.5f);
}
public static int sp2px(Context context, float sp) {
return (int) (getFontDensity(context) * sp + 0.5f);
}
public static int px2sp(Context context, float px) {
return (int) (px / getFontDensity(context) + 0.5f);
}
public static int getWindowWidth(Context context) {
return getDisplayMetrics(context).widthPixels;
}
public static int getWindowHeight(Context context) {
return getDisplayMetrics(context).heightPixels;
}
public static String getPathFormat(String path) {
if (!TextUtils.isEmpty(path)) {
int lastPeriodIndex = path.lastIndexOf('.');
if (lastPeriodIndex > 0 && lastPeriodIndex + 1 < path.length()) {
String format = path.substring(lastPeriodIndex + 1);
if (!TextUtils.isEmpty(format)) {
return format.toLowerCase();
}
}
}
return "";
}
public static boolean isGif(String url) {
return "gif".equals(getPathFormat(url));
}
public static Bitmap getTextBitmap(Context context, int width, int height, int radius, String text, int textSize, @ColorRes int bgColor) {
radius = dp2px(context, radius);
Bitmap bitmap = Bitmap.createBitmap(dp2px(context, width), dp2px(context, height), Bitmap.Config.ARGB_8888);
Canvas canvas = new Canvas(bitmap);
RectF rect = new RectF(0, 0, canvas.getWidth(), canvas.getHeight());
Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);
paint.setColor(context.getResources().getColor(bgColor));
canvas.drawRoundRect(new RectF(0, 0, rect.width(), rect.height()), radius, radius, paint);
paint.setColor(Color.WHITE);
paint.setTextSize(dp2px(context, textSize));
paint.setTextAlign(Paint.Align.CENTER);
Paint.FontMetricsInt fontMetrics = paint.getFontMetricsInt();
float baseline = (rect.bottom + rect.top - fontMetrics.bottom - fontMetrics.top) / 2;
canvas.drawText(text, rect.centerX(), baseline, paint);
return bitmap;
}
public static Drawable getTextDrawable(Context context, int width, int height, int radius, String text, int textSize, @ColorRes int bgColor) {
return new BitmapDrawable(getTextBitmap(context, width, height, radius, text, textSize, bgColor));
}
public static boolean isEmpty(Collection<?> collection) {
return collection == null || collection.isEmpty();
}
public static int getSize(Collection<?> collection) {
return collection == null ? 0 : collection.size();
}
}4.主界面
package com.example.myapplication7;
import android.graphics.Bitmap;
import android.graphics.Color;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.util.Log;
import android.view.View;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.appcompat.app.AppCompatActivity;
public class MainActivity extends AppCompatActivity {
private String fileName;
private CircleProgressView progressView;
private Bitmap bitmap;
private int i = 0;
final Handler handler = new Handler(new Handler.Callback() {
@Override
public boolean handleMessage(@NonNull Message msg) {
if (msg.what == 1) {
//do something
int a = (int) msg.obj;
Log.e("TAG", "handleMessage" + a);
progressView.setProgress(a * 10);
if (a == 10) {
progressView.setVisibility(View.GONE);
}
}
return false;
}
});
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
progressView = findViewById(R.id.progressView);
getWindow().setTitleColor(Color.rgb(65, 183, 216));
//主線程中調用：
new Thread(new MyThread()).start();
}
class MyThread extends Thread {//這里也可用Runnable接口實現
@Override
public void run() {
while (true) {
try {
Thread.sleep(500);//每隔1s執行一次
Message msg = new Message();
msg.what = 1;
i++;
msg.obj = i;
handler.sendMessage(msg);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
}
}5.布局
<?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="match_parent" android:orientation="vertical"> <com.example.myapplication7.CircleProgressView android:id="@+id/progressView" android:layout_width="150dp" android:layout_height="150dp" android:progress="0" app:cpv_innerPadding="2dp" app:cpv_outerColor="@android:color/darker_gray" app:cpv_outerSize="1dp" app:cpv_progressNormalColor="@android:color/darker_gray" app:cpv_progressReachColor="@color/white" app:cpv_progressStyle="FillInnerArc" /> </LinearLayout>
6.資源文件
<?xml version="1.0" encoding="utf-8"?> <resources> <declare-styleable name="CircleProgressView"> <attr name="cpv_progressNormalColor" format="color" /> <attr name="cpv_progressReachColor" format="color" /> <attr name="cpv_progressTextColor" format="color" /> <attr name="cpv_progressTextSize" format="dimension" /> <attr name="cpv_progressTextOffset" format="dimension" /> <attr name="cpv_progressNormalSize" format="dimension" /> <attr name="cpv_progressReachSize" format="dimension" /> <attr name="cpv_radius" format="dimension" /> <attr name="cpv_progressTextVisible" format="boolean" /> <attr name="cpv_progressStartArc" format="integer" /> <attr name="cpv_progressTextSkewX" format="dimension" /> <attr name="cpv_progressTextPrefix" format="string" /> <attr name="cpv_progressTextSuffix" format="string" /> <attr name="cpv_innerBackgroundColor" format="color" /> <attr name="cpv_progressStyle" format="enum"> <enum name="Normal" value="0" /> <enum name="FillInner" value="1" /> <enum name="FillInnerArc" value="2" /> </attr> <attr name="cpv_innerProgressColor" format="color" /> <attr name="cpv_innerPadding" format="dimension" /> <attr name="cpv_outerColor" format="color" /> <attr name="cpv_outerSize" format="dimension" /> <attr name="cpv_reachCapRound" format="boolean" /> </declare-styleable> </resources>
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