自定义控件-圆形进度条

最新推荐文章于 2025-06-05 10:59:58 发布

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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();

            }
        }