自定义控件-圆形进度条

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package com.example.yuanxingjindutiao;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.os.Handler;import android.os.Message;import android.support.annotation.Nullable;import android.util.AttributeSet;import android.view.MotionEvent;import android.view.View;/** * Created by Administrator on 2017/11/30,0030. * 自己创建一个继承view的方法 */public class MyView extends View {    private  int progress = 0;    private Handler handler = new Handler(){        @Override        public void handleMessage(Message msg) {            if (msg.what == 0){                if (progress < 100){                    progress ++;                    //重新绘制                    postInvalidate();                    sendEmptyMessageDelayed(0,100);                }            }        }    };    public MyView(Context context) {        super(context);    }    public MyView(Context context, @Nullable AttributeSet attrs) {        super(context, attrs);    }    public MyView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {        super(context, attrs, defStyleAttr);    }    @Override    protected void onDraw(Canvas canvas) {        super.onDraw(canvas);        //定义画笔        Paint paint = new Paint();        paint.setStyle(Paint.Style.STROKE);        paint.setColor(Color.RED);        paint.setStrokeWidth(1);        paint.setAntiAlias(true);        // 绘制圆圈，进度条背景//        canvas.drawCircle(cx,cy,100,paint);        canvas.drawCircle(getMeasuredWidth()/2,getMeasuredHeight()/2,getMeasuredWidth()/2,paint);        RectF rectF = new RectF(0,0,getMeasuredWidth(),getMeasuredHeight());        paint.setColor(Color.GREEN);        paint.setStrokeWidth(5);        //画圆弧....360...100 progress        canvas.drawArc(rectF,-90,360*progress/100,false,paint);        String text = progress+"%";        //设置文字的大小,需要在测量之前        paint.setTextSize(40);        paint.setColor(Color.BLACK);        paint.setStrokeWidth(1);        paint.setStyle(Paint.Style.FILL);        Rect rect = new Rect();        //测量        paint.getTextBounds(text,0,text.length(),rect);        //画文字        canvas.drawText(text,getMeasuredWidth()/2-rect.width()/2,getMeasuredHeight()/2+rect.height()/2,paint);    }    public void start(){        handler.sendEmptyMessageDelayed(0,10);    }}

布局中将自己写的view方法放到布局中；

        //main方法里        public class MainActivity extends AppCompatActivity {            private MyView myView;            @Override            protected void onCreate(Bundle savedInstanceState) {                super.onCreate(savedInstanceState);//通过id找到这个方法让他启动                myView = findViewById(R.id.mv);                myView.start();            }        }

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