自定义View圆环进度条

相信大家都对自定义view有所了解，今天给大家展示一下我自己写的小Demo，一个自定义环形进度条，进度在不断加载的过程中颜色呈现渐变效果，并且中间的Textview展示进度值，有两个button控制暂停和自动循环播放，话不多说，直接上效果

先写自定义view类

package test.bwie.com.liugang20170612;import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.LinearGradient;
import android.graphics.Paint;
import android.graphics.RectF;
import android.graphics.Shader;
import android.util.AttributeSet;
import android.util.TypedValue;
import android.view.MotionEvent;
import android.view.View;/**
 * @ Description:
 * @ Date:2017/6/12
 * @ Author:刘刚
 */

public class GradientProgressBar extends View {/*圆弧线宽*/
    private float circleBorderWidth = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 20, getResources().getDisplayMetrics());/*内边距*/
    private float circlePadding = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 20, getResources().getDisplayMetrics());/*字体大小*/
    private float textSize = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_SP, 50, getResources().getDisplayMetrics());/*绘制圆周的画笔*/
    private Paint backCirclePaint;/*绘制圆周白色分割线的画笔*/
    private Paint linePaint;/*绘制文字的画笔*/
    private Paint textPaint;/*百分比*/
    private int percent = 0;/*渐变圆周颜色数组*/
    private int[] gradientColorArray = new int[]{Color.GREEN, Color.parseColor("#fe751a"), Color.parseColor("#13be23"), Color.GREEN};private Paint gradientCirclePaint;public GradientProgressBar(Context context) {super(context);init();}public GradientProgressBar(Context context, AttributeSet attrs) {super(context, attrs);init();}public GradientProgressBar(Context context, AttributeSet attrs, int defStyleAttr) {super(context, attrs, defStyleAttr);init();}private void init() {backCirclePaint = new Paint();backCirclePaint.setStyle(Paint.Style.STROKE);backCirclePaint.setAntiAlias(true);backCirclePaint.setColor(Color.LTGRAY);backCirclePaint.setStrokeWidth(circleBorderWidth);
//        backCirclePaint.setMaskFilter(new BlurMaskFilter(20, BlurMaskFilter.Blur.OUTER));

        gradientCirclePaint = new Paint();gradientCirclePaint.setStyle(Paint.Style.STROKE);gradientCirclePaint.setAntiAlias(true);gradientCirclePaint.setColor(Color.LTGRAY);gradientCirclePaint.setStrokeWidth(circleBorderWidth);linePaint = new Paint();linePaint.setColor(Color.WHITE);linePaint.setStrokeWidth(5);textPaint = new Paint();textPaint.setAntiAlias(true);textPaint.setTextSize(textSize);textPaint.setColor(Color.BLACK);}@Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {int measureWidth = MeasureSpec.getSize(widthMeasureSpec);int measureHeight = MeasureSpec.getSize(heightMeasureSpec);setMeasuredDimension(Math.min(measureWidth, measureHeight), Math.min(measureWidth, measureHeight));}@Override
    protected void onDraw(Canvas canvas) {super.onDraw(canvas);//1.绘制灰色背景圆环
        canvas.drawArc(new RectF(circlePadding * 2, circlePadding * 2,getMeasuredWidth() - circlePadding * 2, getMeasuredHeight() - circlePadding * 2), -90, 360, false, backCirclePaint);//2.绘制颜色渐变圆环
        LinearGradient linearGradient = new LinearGradient(circlePadding, circlePadding,getMeasuredWidth() - circlePadding,getMeasuredHeight() - circlePadding,gradientColorArray, null, Shader.TileMode.MIRROR);gradientCirclePaint.setShader(linearGradient);gradientCirclePaint.setShadowLayer(10, 10, 10, Color.RED);canvas.drawArc(new RectF(circlePadding * 2, circlePadding * 2,getMeasuredWidth() - circlePadding * 2, getMeasuredHeight() - circlePadding * 2), -90, (float) (percent / 100.0) * 360, false, gradientCirclePaint);//半径
        float radius = (getMeasuredWidth() - circlePadding * 3) / 2;//X轴中点坐标
        int centerX = getMeasuredWidth() / 2;//3.绘制100份线段，切分空心圆弧
        for (float i = 0; i < 360; i += 3.6) {double rad = i * Math.PI / 180;float startX = (float) (centerX + (radius - circleBorderWidth) * Math.sin(rad));float startY = (float) (centerX + (radius - circleBorderWidth) * Math.cos(rad));float stopX = (float) (centerX + radius * Math.sin(rad) + 1);float stopY = (float) (centerX + radius * Math.cos(rad) + 1);canvas.drawLine(startX, startY, stopX, stopY, linePaint);}//4.绘制文字
        float textWidth = textPaint.measureText(percent + "%");int textHeight = (int) (Math.ceil(textPaint.getFontMetrics().descent - textPaint.getFontMetrics().ascent) + 2);canvas.drawText(percent + "%", centerX - textWidth / 2, centerX + textHeight / 4, textPaint);}/**
     * 设置百分比
     *
     * @param percent
     */
    public void setPercent(int percent) {if (percent < 0) {percent = 0;} else if (percent > 100) {percent = 100;}this.percent = percent;invalidate();}public int getPercent() {return percent;}//view完成绘制之后可以随意拖动图片可拖动
    private int lastX = 0; private int lastY = 0;@Override
    public boolean onTouchEvent(MotionEvent event) {switch (event.getAction()) {case MotionEvent.ACTION_DOWN:lastX = (int) event.getRawX();lastY = (int) event.getRawY();break;case MotionEvent.ACTION_MOVE:int dx = (int) event.getRawX() - lastX;int dy = (int) event.getRawY() - lastY;int left = getLeft() + dx;int top = getTop() + dy;int right = getRight() + dx;int bottom = getBottom() + dy;layout(left, top, right, bottom);lastX = (int) event.getRawX();lastY = (int) event.getRawY();break;case MotionEvent.ACTION_UP:break;default:break;}return true;}}

在xml布局中定义该View

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/activity_main3"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
>
<test.bwie.com.liugang20170612.GradientProgressBar
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:id="@+id/gp"
    android:layout_centerInParent="true"
    /><Button
        android:text="循环"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_alignParentStart="true"
        android:layout_marginStart="51dp"
        android:layout_marginTop="48dp"
        android:id="@+id/btn1"/><Button
        android:text="暂停"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignTop="@+id/btn1"
        android:layout_alignParentEnd="true"
        android:layout_marginEnd="52dp"
        android:id="@+id/btn2"/>
</RelativeLayout>

最后在MainActivity中写具体的逻辑代码

package test.bwie.com.liugang20170612;import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;public class Main3Activity extends AppCompatActivity implements View.OnClickListener {private GradientProgressBar gp;private Button btn1;private Button btn2;boolean flag=false;Handler handler=new Handler(){private int mPercent;@Override
       public void handleMessage(Message msg) {super.handleMessage(msg);switch (msg.what){case 0:mPercent = gp.getPercent();gp.setPercent(++mPercent);if (mPercent >=100){gp.setPercent(100);if (flag){handler.removeMessages(0);handler.sendEmptyMessageDelayed(1,100);}}else {handler.sendEmptyMessageDelayed(0,100);}break;case 1:      //逆时针旋转
gp.setPercent(mPercent--);if (mPercent<=0){handler.removeMessages(1);gp.setPercent(0);   handler.sendEmptyMessageDelayed(0,100);}else {handler.sendEmptyMessageDelayed(1,100);}break;}}};@Override
    protected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main3);initView();}private void initView() {gp = (GradientProgressBar) findViewById(R.id.gp);btn1 = (Button) findViewById(R.id.btn1);btn2 = (Button) findViewById(R.id.btn2);btn1.setOnClickListener(this);btn2.setOnClickListener(this);handler.sendEmptyMessageDelayed(0,100);}@Override
    public void onClick(View v) {switch (v.getId()) {case R.id.btn1:flag=true;handler.sendEmptyMessageDelayed(0,100);break;case R.id.btn2:handler.removeMessages(0);  //暂停我急handler.removeMessages(1);break;}}
}

最后附上我的github地址点击打开链接

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