自定义View进度条

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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();            }        });    }}

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