Android实现动态体温计

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import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.LinearGradient;
import android.graphics.Paint;
import android.graphics.RectF;
import android.graphics.Shader;
import android.util.DisplayMetrics;
import android.view.View;

public class DrawTemp extends View{


 private float wide;
 private float high;
 private float t_wide;
 private float t_high ;
 private float r; //半径大小
 private float x0;//圆心坐标
 private float x1;
 private float y0;
 private float y1;
 /*自定义颜色*/
 private int color_blue = Color.argb(255, 25, 25, 112);
 private int color_bule1 = Color.argb(250, 65,105,225);
 private int color_white = Color.argb(30, 250, 250, 250);
 private int color_white1 = Color.argb(60, 250, 250, 250);
 private int color_orange = Color.argb(250, 255, 255, 0);
 public DrawTemp(Context context) {
  super(context);
  // TODO 自动生成的构造函数存根
   Paint paint = new Paint();
   paint.setColor(Color.YELLOW);
 }

  protected void onDraw(Canvas canvas)
  {
   DisplayMetrics dm = new DisplayMetrics(); 
   dm = getResources().getDisplayMetrics();
  wide = dm.widthPixels; // 屏幕宽（像素，如：480px） 
 high = dm.heightPixels; // 屏幕高（像素，如：800px）
   t_wide = wide/20;
   t_high = high/20;
   r = t_high-10;
   x0 = wide/2+2*t_wide;
   x1 = wide/2+4*t_wide;
   y0 = t_high*2;
   y1 = 10*t_high;

   float ydegree = 9*t_high; 
   int min_temp = 35; //最低温度为35
   int m1 = 4;
   int Line1_size = 1;
    int Line2_size = 3;
    int Line3_size = 5;
   //设置最小大刻度线条参数
   Paint paintLine1 = new Paint(); 
   paintLine1.setColor(Color.BLUE); 
   paintLine1.setStrokeWidth(Line3_size);
   //设置中等刻度线条参数
   Paint paintLine2 = new Paint(); 
   paintLine2.setColor(Color.YELLOW); 
   paintLine2.setStrokeWidth(Line2_size);
   //设置最小刻度线条参数
   Paint paintLine3 = new Paint(); 
   paintLine3.setColor(Color.GREEN); 
   paintLine3.setStrokeWidth(Line1_size);
   //设置文字参数
   Paint text = new Paint();
   text.setColor(Color.MAGENTA);
   text.setTextSize(30);

   Paint mPaint = new Paint(); 
   mPaint.setStrokeWidth(m1);
   LinearGradient ng= new LinearGradient(x0-10, y0, x1-10, y0, color_blue,color_bule1, Shader.TileMode.CLAMP);
   mPaint.setShader(ng);
   canvas.drawRect(x0-10, y0, x1+10, y1, mPaint);//绘制外围矩形
   canvas.drawCircle(x0+t_wide, y0, t_wide+10,mPaint );//绘制外围上部分圆弧
   canvas.drawCircle(x0+t_wide, y1,r+10, mPaint);//绘制外围底座


   //绘制水银柱
   Paint nPaint = new Paint();
   nPaint.setColor(Color.RED);
   canvas.drawCircle(x0+t_wide, y1, r-10, nPaint); 
   //LinearGradient mg= new LinearGradient(x0+10, y1, x0-10, y0, Color.RED,color_orange, Shader.TileMode.CLAMP);
   LinearGradient mg= new LinearGradient(x0+10, y1, x1-10, y0, Color.RED,color_orange, Shader.TileMode.CLAMP); 
   nPaint.setShader(mg);

   //绘制动态矩形
   // canvas.drawRect(x0+10, y, x1-10, y1, nPaint);

   //绘制光晕，圆角矩形
   Paint paint = new Paint();
   paint.setColor(color_white);
   RectF Rect = new RectF(x0-5, y0,x0+5, y1-t_high);

   canvas.drawCircle(x0+t_wide, y0-t_wide/2-t_wide/3, t_wide/3,paint );
   canvas.drawCircle(x0+t_wide, y0, t_wide-t_wide/8,mPaint );

   canvas.drawCircle(x0+t_wide-8, y1, r-10, paint);

   canvas.drawCircle(x0+t_wide, y1, r-10, nPaint); 
   paint.setColor(color_white1);
   RectF Rect3 = new RectF(x0, y1, x0+t_wide, y1+t_wide);
   canvas.drawArc(Rect3, 0, 30, false, paint);

   while (ydegree > y0+30) {  
     canvas.drawLine(x1+10, ydegree, x1+15, ydegree, paintLine3); 
    if (ydegree % t_high == 0) { 
     canvas.drawLine(x1+10, ydegree, x1+50, ydegree, paintLine1); 
     canvas.drawText(min_temp + "", x1+55, ydegree + 5, text); 
     min_temp++; 
    } 
    else if(ydegree % (t_high/2) == 0)
    {
      canvas.drawLine(x1+10, ydegree, x1+25, ydegree, paintLine2); 
    }
    ydegree = ydegree - 2 ; 
   }  
} 
}

public void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.temp_layout);

  innit(); // 初始化
 ActionBarUtils.initActionBar(getApplicationContext(), getActionBar(),
    "体温");

  timer = new Timer();

   start.setOnClickListener(new OnClickListener()
   {

   @Override
   public void onClick(View v) {
    // TODO 自动生成的方法存根
     timer= new Timer();

     handler = new Handler()
     { 
      @Override 
      public void handleMessage(Message msg) 
      {  //刷新图表 
        s = String.valueOf(min_data);   

        if(msg.what == 1)
        { 
         text1.setText(s); 
        }
        if(msg.what == 0)
        {
         String num = String.valueOf(number);
         text1.setText(num);
        }
        else if(msg.what == 2)
        {
         text1.setText("爆表啦");
        }

        super.handleMessage(msg); 
      } 
     };

     task = new TimerTask() 
     { 
      @Override 
      public void run() 
      { 
       Message message = new Message();
       // drawPmThread pm = new drawPmThread();
       if( min_data == number)
       {
        onDestroy();
       }

       if(number>40)
        {
        message.what = 2;
        handler.sendMessage(message);
        }

       if(0