分享一个环形进度条供大家参考，项目地址
https://download.csdn.net/download/weixin_40998254/10595267
效果如图
image
下面是该自定义进度条的代码，目前属于简陋版本，不过注释很详细，方便扩展。
首先是自定View的代码
/**
* 作者：GJP on 2018/7/26 15:12
* 邮箱：xiaoxiao9575@126.com
* 描述：
*/
public class CircularProgressView extends View {
private Context mContext;
private Paint mPaint;
private int mProgress = 0;
private static int MAX_PROGRESS = 100;
/** * 弧度 */
private int mAngle;
/** * 中间的文字 */
private String mText;
/** * 外圆颜色 */
private int outRoundColor;
/** * 内圆的颜色 */
private int inRoundColor;
/** * 线的宽度 */
private int roundWidth;
private int style;
/*** 字体颜色*/
private int textColor;
/** * 字体大小 */
private float textSize;
/** * 字体是否加粗 */
private boolean isBold;
/** * 进度条颜色 */
private int progressBarColor;
public CircularProgressView(Context context) {
this(context, null);
}
public CircularProgressView(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public CircularProgressView(Context context, AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr);
mContext = context;
init(attrs);
}
@TargetApi(21)
public CircularProgressView(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
super(context, attrs, defStyleAttr, defStyleRes);
mContext = context;
init(attrs);
}
/**
* 解析自定义属性
* @param attrs
*/
public void init(AttributeSet attrs) {
mPaint = new Paint();
TypedArray typedArray = mContext.obtainStyledAttributes(attrs, R.styleable.CircleProgressBar);
outRoundColor = typedArray.getColor(R.styleable.CircleProgressBar_outCircleColor, getResources().getColor(R.color.colorPrimary));
inRoundColor = typedArray.getColor(R.styleable.CircleProgressBar_inCircleColor, getResources().getColor(R.color.colorPrimaryDark));
progressBarColor = typedArray.getColor(R.styleable.CircleProgressBar_progressColor, getResources().getColor(R.color.colorAccent));
isBold = typedArray.getBoolean(R.styleable.CircleProgressBar_textBold, false);
textColor = typedArray.getColor(R.styleable.CircleProgressBar_textColor, Color.BLACK);
roundWidth = typedArray.getDimensionPixelOffset(R.styleable.CircleProgressBar_lineWidth, 20);
typedArray.recycle();
}
@Override
protected void onDraw(Canvas canvas) { /** * 画外圆 */
super.onDraw(canvas);
int center = getWidth() / 2;//圆心
int radius = (center - roundWidth / 2);// 半径
mPaint.setColor(outRoundColor); //外圆颜色
mPaint.setStrokeWidth(roundWidth); //线的宽度
mPaint.setStyle(Paint.Style.STROKE); //空心圆
mPaint.setAntiAlias(true); //消除锯齿
canvas.drawCircle(center, center, radius, mPaint); //内圆
mPaint.setColor(inRoundColor);
radius = radius - roundWidth;
canvas.drawCircle(center, center, radius, mPaint); //画进度是一个弧线
mPaint.setColor(progressBarColor);
RectF rectF = new RectF(center - radius, center - radius, center + radius, center + radius);//圆弧范围的外接矩形
canvas.drawArc(rectF, -90, mAngle, false, mPaint);
canvas.save(); //平移画布之前保存之前画的
// 画进度终点的小球,旋转画布的方式实现
mPaint.setStyle(Paint.Style.FILL);
// 将画布坐标原点移动至圆心
canvas.translate(center, center);
// 旋转和进度相同的角度,因为进度是从-90度开始的所以-90度
canvas.rotate(mAngle - 90);
// 同理从圆心出发直接将原点平移至要画小球的位置
canvas.translate(radius, 0);
canvas.drawCircle(0, 0, roundWidth, mPaint);
// 画完之后恢复画布坐标
canvas.restore();
// 画文字将坐标平移至圆心
canvas.translate(center, center);
mPaint.setStrokeWidth(0);
mPaint.setColor(textColor);
if (isBold) { //字体加粗
mPaint.setTypeface(Typeface.DEFAULT_BOLD);
} if (!TextUtils.isEmpty(mText)) {
// 动态设置文字长为圆半径,计算字体大小
float textLength = mText.length();
textSize = radius / textLength;
mPaint.setTextSize(textSize);
// 将文字画到中间
float textWidth = mPaint.measureText(mText);
canvas.drawText(mText, -textWidth / 2, textSize / 2, mPaint);
}
}
public int getProgress() {
return mProgress;
}
/**
* 设置进度
* @return
*/
public void setProgress(int p) {
if (p > MAX_PROGRESS) {
mProgress = MAX_PROGRESS;
mAngle = 360;
} else {
mProgress = p;
mAngle = 360 * p / MAX_PROGRESS;
}
//更新画布
invalidate();
}
public String getText() {
return mText;
}
/**
* 设置文本
* @param mText
*/
public void setText(String mText) {
this.mText = mText;
invalidate();
}
}
styles.xml中需要添加
<declare-styleable name="CircleProgressBar">
<attr name="outCircleColor" format="color"></attr>
<attr name="inCircleColor" format="color"></attr>
<attr name="progressColor" format="color"></attr>
<attr name="textColor" format="color"></attr>
<attr name="textBold" format="boolean"></attr>
<attr name="lineWidth" format="dimension"></attr>
</declare-styleable>
再布局文件中引用的示例代码
<com.xiaoxiao9575.circularprogressapplication.CircularProgressView
android:id="@+id/progress_bar"
android:layout_centerInParent="true"
android:layout_centerHorizontal="true"
android:layout_width="150dp"
android:layout_height="150dp"
app:inCircleColor="#DCDCDC"
app:outCircleColor="#F0F0F0"
app:progressColor="#50CE7B"
app:textBold="true"
app:textColor="#50CE7B"
app:lineWidth="5dp" />
Activity中具体控制进度
public class MainActivity extends AppCompatActivity {
private CircularProgressView progress_bar;
@SuppressLint("HandlerLeak")
private Handler handler = new Handler(){
@Override
public void handleMessage(Message msg) {
super.handleMessage(msg);
progress_bar.setProgress(msg.what);
progress_bar.setText(progress_bar.getProgress()+"%");
addProgress(msg.what);
}
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initView();
}
private void initView() {
progress_bar = (CircularProgressView) findViewById(R.id.progress_bar);
progress_bar.setProgress(0);
progress_bar.setText(progress_bar.getProgress()+"%");
addProgress(0);
}
private void addProgress(int i) {
if (i>=100){
i = 0;
}else {
++i;
}
handler.sendEmptyMessageDelayed(i, 100);
}
}
关于这个自定义的环形进度条没什么说的，代码注释很详细，使用方法都粘贴出来了，因为扩展起来很方便所以粘贴出来供大家参考和自己留作记录，如果有时间后续会发一个完善些的圆形进度条到GitHub上。
