这篇文章主要介绍Android如何实现环形进度条，文中介绍的非常详细，具有一定的参考价值，感兴趣的小伙伴们一定要看完！
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一个通俗易懂的环形进度条，可以定制颜色角度，监听进度。
定义一个attrs.xml
自定义CircleProgressView
package com.sample.circleprogressview.widget;
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.support.annotation.Nullable;
import android.util.AttributeSet;
import android.view.View;
import android.view.animation.LinearInterpolator;
import com.sample.circleprogressview.R;
/**
* 普通环形进度条
*/
public class CircleProgressView extends View {
private int mCurrent;//当前进度
private Paint mBgPaint;//背景弧线paint
private Paint mProgressPaint;//进度Paint
private float mProgressWidth;//进度条宽度
private int mProgressColor = Color.RED;//进度条颜色
private int locationStart;//起始位置
private float startAngle;//开始角度
private ValueAnimator mAnimator;
public CircleProgressView(Context context) {
this(context, null);
}
public CircleProgressView(Context context, @Nullable AttributeSet attrs) {
this(context, attrs, 0);
}
public CircleProgressView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
init(context, attrs);
}
private void init(Context context, AttributeSet attrs) {
TypedArray typedArray = context.obtainStyledAttributes(attrs, R.styleable.CircleProgressView);
locationStart = typedArray.getInt(R.styleable.CircleProgressView_location_start, 1);
mProgressWidth = typedArray.getDimension(R.styleable.CircleProgressView_progress_width, dp2px(context, 4));
mProgressColor = typedArray.getColor(R.styleable.CircleProgressView_progress_color, mProgressColor);
typedArray.recycle();
//背景圆弧
mBgPaint = new Paint();
mBgPaint.setAntiAlias(true);
mBgPaint.setStrokeWidth(mProgressWidth);
mBgPaint.setStyle(Paint.Style.STROKE);
mBgPaint.setColor(Color.parseColor("#eaecf0"));
mBgPaint.setStrokeCap(Paint.Cap.ROUND);
//进度圆弧
mProgressPaint = new Paint();
mProgressPaint.setAntiAlias(true);
mProgressPaint.setStyle(Paint.Style.STROKE);
mProgressPaint.setStrokeWidth(mProgressWidth);
mProgressPaint.setColor(mProgressColor);
mProgressPaint.setStrokeCap(Paint.Cap.ROUND);
//进度条起始角度
if (locationStart == 1) {//左
startAngle = -180;
} else if (locationStart == 2) {//上
startAngle = -90;
} else if (locationStart == 3) {//右
startAngle = 0;
} else if (locationStart == 4) {//下
startAngle = 90;
}
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
int width = MeasureSpec.getSize(widthMeasureSpec);
int height = MeasureSpec.getSize(heightMeasureSpec);
int size = width < height ? width : height;
setMeasuredDimension(size, size);
}
/**
* oval // 绘制范围
* startAngle // 开始角度
* sweepAngle // 扫过角度
* useCenter // 是否使用中心
*/
@Override
protected void onDraw(Canvas canvas) {
//绘制背景圆弧
RectF rectF = new RectF(mProgressWidth / 2, mProgressWidth / 2, getWidth() - mProgressWidth / 2, getHeight() - mProgressWidth / 2);
canvas.drawArc(rectF, 0, 360, false, mBgPaint);
//绘制当前进度
float sweepAngle = 360 * mCurrent / 100;
canvas.drawArc(rectF, startAngle, sweepAngle, false, mProgressPaint);
}
public int getCurrent() {
return mCurrent;
}
/**
* 设置进度
*
* @param current
*/
public void setCurrent(int current) {
mCurrent = current;
invalidate();
}
private int tCurrent = -1;
/**
* 动画效果
*
* @param current 精度条进度：0-100
* @param duration 动画时间
*/
public void startAnimProgress(int current, int duration) {
mAnimator = ValueAnimator.ofInt(0, current);
mAnimator.setDuration(duration);
mAnimator.setInterpolator(new LinearInterpolator());
mAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
@Override
public void onAnimationUpdate(ValueAnimator animation) {
int current = (int) animation.getAnimatedValue();
if (tCurrent != current) {
tCurrent = current;
setCurrent(current);
if (mOnAnimProgressListener != null)
mOnAnimProgressListener.valueUpdate(current);
}
}
});
mAnimator.start();
}
public interface OnAnimProgressListener {
void valueUpdate(int progress);
}
private OnAnimProgressListener mOnAnimProgressListener;
/**
* 监听进度条进度
*
* @param onAnimProgressListener
*/
public void setOnAnimProgressListener(OnAnimProgressListener onAnimProgressListener) {
mOnAnimProgressListener = onAnimProgressListener;
}
public void destroy() {
if (mAnimator != null) {
mAnimator.cancel();
}
}
public static int dp2px(Context context, float dpValue) {
final float scale = context.getResources().getDisplayMetrics().density;
return (int) (dpValue * scale + 0.5f);
}
}代码就这么些，接下来我们测算一下
package com.sample.circleprogressview;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import com.sample.circleprogressview.widget.CircleProgressView;
public class MainActivity extends AppCompatActivity implements View.OnClickListener {
private CircleProgressView circle_progress;
private TextView tv_progress;
private Button btn_start;
private Button btn_reset;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btn_start = (Button) findViewById(R.id.btn_start);
btn_reset = (Button) findViewById(R.id.btn_reset);
circle_progress = (CircleProgressView) findViewById(R.id.circle_progress);
tv_progress = (TextView) findViewById(R.id.tv_progress);
btn_start.setOnClickListener(this);
btn_reset.setOnClickListener(this);
}
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.btn_start:
//开锁执行动画效果
circle_progress.startAnimProgress(50, 1200);
//监听进度条进度
circle_progress.setOnAnimProgressListener(new CircleProgressView.OnAnimProgressListener() {
@Override
public void valueUpdate(int progress) {
tv_progress.setText(String.valueOf(progress));
}
});
break;
case R.id.btn_reset:
circle_progress.setCurrent(0);
tv_progress.setText("0");
break;
}
}
@Override
protected void onDestroy() {
super.onDestroy();
if (circle_progress != null) {
circle_progress.destroy();
}
}
}以上是“Android如何实现环形进度条”这篇文章的所有内容，感谢各位的阅读！希望分享的内容对大家有帮助，更多相关知识，欢迎关注创新互联行业资讯频道！
新闻标题：Android如何实现环形进度条
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