自定义View加载进度条首页面

1.主页面布局

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <TextView
        android:id="@+id/tv_bw"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="143dp"
        android:text="八维电商"
        android:textSize="40sp" />

    <com.bawie.www.month1.CircleProgressBar
        android:id="@+id/circle_progress"
        android:layout_width="200dp"
        android:layout_height="200dp"
        android:layout_alignParentBottom="true"
        android:layout_centerHorizontal="true"
        android:layout_marginBottom="159dp" />

</RelativeLayout>

MainActivity

package com.bawie.www.month1;

import android.animation.AnimatorSet;
import android.animation.ObjectAnimator;
import android.annotation.SuppressLint;
import android.content.Intent;
import android.os.Handler;
import android.os.Message;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity implements View.OnClickListener {
        private CircleProgressBar circleProgressBar;
        private float progress = 0;
        private TextView tv_bw;

        @SuppressLint("HandlerLeak")
        private Handler handler = new Handler() {
            @Override
            public void handleMessage(Message msg) {
                if (msg.what == 1) {
                    if (progress <= 99) {
                        ++progress;
                        circleProgressBar.setProgress(progress);  //更新进度条
                        this.sendEmptyMessageDelayed(1,1);
                    }
                }
            }
        };

        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
            initView();
        }

        public void donghua(){
            AnimatorSet animatorSet = new AnimatorSet();
            ObjectAnimator ob1 = ObjectAnimator.ofFloat(tv_bw, "scaleX", new float[]{1f, 3f, 1f});
            ob1.setDuration(2000);
            ObjectAnimator ob2 = ObjectAnimator.ofFloat(tv_bw, "alpha", new float[]{1.0f,0.8f});
            ob2.setDuration(2000);
            ObjectAnimator ob3 = ObjectAnimator.ofFloat(tv_bw, "rotationX", new float[]{0f, 360f});
            ob3.setDuration(2000);
            animatorSet.playTogether(ob1,ob2,ob3);
            animatorSet.start();
        }

        private void initView() {
            circleProgressBar = findViewById(R.id.circle_progress);
            circleProgressBar.setOnClickListener(this);

            tv_bw = findViewById(R.id.tv_bw);
        }

        @Override
        public void onClick(View v) {
            switch (v.getId()){
                case R.id.circle_progress:
                    handler.sendEmptyMessageDelayed(1, 1);

                    donghua();
                    new Handler().postDelayed(new Runnable(){
                        public void run() {
                            //execute the task
                            Intent intent = new Intent(MainActivity.this,ShowActivity.class);
                            startActivity(intent);
                            finish();
                        }
                    }, 2000);
                    break;
            }
        }



}

CircleProgressBar

package com.bawie.www.month1;

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Rect;
import android.graphics.RectF;
import android.util.AttributeSet;
import android.view.View;

/**
 * date:2018/11/21
 * author:别来无恙(别来无恙)
 * function:
 */
public class CircleProgressBar extends View {
    private Context context;
    private int height,width;  //自定义控件的宽高
    private float progress;  //进度
    private Paint paint;  //蓝色扇形所需的画笔
    private Paint bkPaint;  //绿色圆形所需的画笔
    private Paint tvPaint;  //圆里面的进度字所需的画笔
    private Rect mBound;  //用于获取字体的大小

    public CircleProgressBar(Context context, AttributeSet attrs) {
        super(context, attrs);
        this.context = context;
        this.paint = new Paint();
        this.bkPaint = new Paint();
        this.tvPaint = new Paint();
        this.mBound = new Rect();
        init();
    }

    private void init(){
        paint.setStyle(Paint.Style.FILL);
        paint.setColor(Color.parseColor("#d91b1b"));
        paint.setAntiAlias(true);
        bkPaint.setStyle(Paint.Style.FILL);
        bkPaint.setColor(Color.parseColor("#afa7a7"));
        bkPaint.setAntiAlias(true);
        tvPaint.setColor(Color.parseColor("#ffffff"));
        tvPaint.setTextSize(15);

    }

    //获取当前控件的高度和宽度，单位是像素
    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
        height = MeasureSpec.getSize(heightMeasureSpec);
        width = MeasureSpec.getSize(widthMeasureSpec);
    }


    private float set2Degree(float sendFt){
        //将进度的数值变为弧度数值，进度100，弧度有360，所以比例是3.6
        return sendFt*3.6f;
    }

    @Override

    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
        if(width*height==0){
            return;
        }
        canvas.drawArc(new RectF(0, 0, width, height), 270, set2Degree(progress), true, paint);  //画蓝色扇形
        canvas.drawCircle(width / 2, height / 2, width / 2 - 5, bkPaint);  //画绿色圆形，半径比蓝色扇形的小5px
        if(progress < 100){   //进度没达到100%时显示进度
            String strPro = String.valueOf((int)progress)+"%";
            tvPaint.getTextBounds(strPro,0,strPro.length(),mBound);
            canvas.drawText(strPro,width/2 - mBound.width()/2,height/2 + mBound.height()/2,tvPaint);
        }else{
            //达到100%后显示完成
            String text = "完成";
            tvPaint.getTextBounds(text,0,text.length(),mBound);
            canvas.drawText(text,width/2 - mBound.width()/2,height/2 + mBound.height()/2,tvPaint);
        }
    }

    public void setProgress(float progress){
        this.progress = progress;
        postInvalidate();
    }
}

注意:不用添加依赖 ,点击小球就能运行起来!!!