自定义View进度条

自定义一个View继承View类

public class MyVicrClass extends View {

    Timer timer = null;
    int outColor = Color.BLACK;
    float du = 0;

    Handler handler = new Handler(){
        @Override
        public void handleMessage(Message msg) {
            super.handleMessage(msg);
            invalidate();
            if(du>=360){
                timer.cancel();
            }
        }
    };

    public MyVicrClass(Context context) {
        super(context);
    }

    public MyVicrClass(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    public MyVicrClass(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
    }

    @RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
    public MyVicrClass(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
        super(context, attrs, defStyleAttr, defStyleRes);
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
    }

    @Override
    protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
        super.onLayout(changed, left, top, right, bottom);
    }

    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
        Paint pa = new Paint();
        Paint p1=new Paint();
        Paint p2=new Paint();

        float fw=getWidth()/2;
        float fh=getHeight()/2;

        Paint p3 = new Paint();
        p3.setColor(Color.RED);
        RectF rectF = new RectF(getWidth()/2-100,getHeight()/2-100,getWidth()/2+100,getHeight()/2+100);
        canvas.drawArc(rectF,0,du,true,p3);

        pa.setColor(Color.BLACK);
        p1.setColor(outColor);
        p2.setColor(Color.WHITE);

        pa.setTextSize(20);

        p1.setAntiAlias(true);
        p2.setAntiAlias(true);

        canvas.drawCircle(fw,fh,80,p1);
        canvas.drawCircle(fw,fh,60,p2);
        canvas.drawText("100%",fw,fh,pa);
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {

        if(event.getAction() == MotionEvent.ACTION_DOWN){
            if(event.getX()<getWidth()/2&&event.getY()<250){
                timer = new Timer();
                timer.schedule(new TimerTask() {
                    @Override
                    public void run() {
                        du+=12;
                        handler.sendEmptyMessage(1);
                    }
                },1000,1000);
            }if(event.getX()>getWidth()/2&&event.getY()<250){
                du=0;
                handler.sendEmptyMessage(1);
            }if(event.getY()<getHeight()-100){
                outColor=Color.BLUE;
                invalidate();
            }
        }




        return super.onTouchEvent(event);

    }
}

这是布局

<?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_main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.bawei.wangyiming2017109.MainActivity">

    <com.bawei.wangyiming2017109.MyVicrClass
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/id1"/>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        >
        <Button
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:id="@+id/btn_start"
            android:text="开始"/>
        <Button
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:id="@+id/btn_reset"
            android:text="重置"/>
    </LinearLayout>
</RelativeLayout>

这是MainActivity

package com.bawei.wangyiming2017109;

import android.os.Message;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

import java.util.Timer;
import java.util.logging.Handler;

public class MainActivity extends AppCompatActivity {

    Button btn_start;
    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);

        btn_start.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Toast.makeText(MainActivity.this,"开始",Toast.LENGTH_SHORT).show();

            }
        });

        btn_reset.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Toast.makeText(MainActivity.this,"重置",Toast.LENGTH_SHORT).show();
            }
        });
    }
}