android自定义view——温度计

</pre><pre name="code" class="java">public class Themometer extends ImageView {	private Paint mPaint;	private int height, width, circle_radius;	private int COLOR_BROWN = Color.parseColor("#A5937B");	private int COLOR_YELLOW = Color.parseColor("#F7AF1F");	private int COLOR_GRAY = Color.parseColor("#C1CDCD");	private int COLOR_TEXT = Color.parseColor("#49BDCC");	private float temperature = 0f;	private float temp_temperature = 0f;	public void setTemperature(float value) {		Log.e(this.getClass().getSimpleName(), "setTemperature " + value);		if (value < 0f) {			value = 0;		} else if (value > 41.5f) {			value = 41.5f;		}		if (value <= 34f) {			value = new BigDecimal(value).setScale(0, BigDecimal.ROUND_HALF_UP).floatValue();		} else {			value = new BigDecimal(value).setScale(1, BigDecimal.ROUND_HALF_UP).floatValue();		}		if (temp_temperature > value) {			temp_temperature = 0f;		}		temperature = value;		invalidate();	}	public Themometer(Context context, AttributeSet attrs) {		super(context, attrs);		init();	}	public Themometer(Context context, AttributeSet attrs, int defStyle) {		super(context, attrs, defStyle);		init();	}	private void init() {		mPaint = new Paint();	}	@Override	protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {		super.onMeasure(widthMeasureSpec, heightMeasureSpec);		this.height = getMeasuredHeight();		this.width = getMeasuredWidth();		circle_radius = width / 4;	}	@Override	protected void onDraw(Canvas canvas) {		super.onDraw(canvas);		drawBG(canvas);		drawScale(canvas);		drawFG(canvas);		if (temp_temperature < temperature && temp_temperature < 41.5) {			if (temp_temperature < 34) {				BigDecimal b1 = new BigDecimal(Float.toString(temp_temperature));				BigDecimal b2 = new BigDecimal(Float.toString(1f));				temp_temperature = b1.add(b2).floatValue();			} else {				BigDecimal b1 = new BigDecimal(Float.toString(temp_temperature));				BigDecimal b2 = new BigDecimal(Float.toString(0.1f));				temp_temperature = b1.add(b2).floatValue();			}			invalidate();		}		// else if(temp_temperature>temperature && temp_temperature>0){		// if (temp_temperature < 34) {		// BigDecimal b1 = new BigDecimal(Float.toString(temp_temperature));		// BigDecimal b2 = new BigDecimal(Float.toString(1f));		// temp_temperature = b1.subtract(b2).floatValue();		// } else {		// BigDecimal b1 = new BigDecimal(Float.toString(temp_temperature));		// BigDecimal b2 = new BigDecimal(Float.toString(0.1f));		// temp_temperature = b1.subtract(b2).floatValue();		// }		// invalidate();		// }	}	// private void refresh() {	// postDelayed(new Runnable() {	// @Override	// public void run() {	// if (temp_temperature < temperature && temp_temperature<41.5) {	// if (temp_temperature < 34.5) {	// BigDecimal b1 = new BigDecimal(Float.toString(temp_temperature));	// BigDecimal b2 = new BigDecimal(Float.toString(0.1f));	// temp_temperature = b1.add(b2).floatValue();	// } else {	// BigDecimal b1 = new BigDecimal(Float.toString(temp_temperature));	// BigDecimal b2 = new BigDecimal(Float.toString(0.01f));	// temp_temperature = b1.add(b2).floatValue();	// }	// invalidate();	// refresh();	// }else if(temp_temperature>temperature && temp_temperature>0){	// if (temp_temperature < 34.5) {	// BigDecimal b1 = new BigDecimal(Float.toString(temp_temperature));	// BigDecimal b2 = new BigDecimal(Float.toString(0.1f));	// temp_temperature = b1.subtract(b2).floatValue();	// } else {	// BigDecimal b1 = new BigDecimal(Float.toString(temp_temperature));	// BigDecimal b2 = new BigDecimal(Float.toString(0.01f));	// temp_temperature = b1.subtract(b2).floatValue();	// }	// invalidate();	// refresh();	// }	// }	// }, 50);	// }	private void drawScale(Canvas canvas) {		drawLines(canvas);		drawText(canvas);	}	private void drawText(Canvas canvas) {		mPaint.reset();		mPaint.setColor(COLOR_TEXT);		mPaint.setAntiAlias(true);		mPaint.setTextSize(getResources().getDimension(R.dimen.scale_text_size));		Typeface font = Typeface.create(Typeface.DEFAULT_BOLD, Typeface.BOLD);		mPaint.setTypeface(font);		mPaint.setTextAlign(Paint.Align.CENTER);		FontMetrics fontMetrics = mPaint.getFontMetrics();		// 计算文字高度		float fontHeight = fontMetrics.bottom - fontMetrics.top;		int line_width = circle_radius * 2 / 3 - 10;		int text_x = this.width - getPaddingRight() - (circle_radius - 5 + circle_radius) - line_width - line_width / 2				- 15;		int begin = 41;		float recH = this.height - getPaddingBottom() - circle_radius - circle_radius + 15 - (getPaddingTop() + 5);		while (begin >= 35) {			float addition = 41.5f - begin;			float addition_h = addition / (41.5f - 34.5f) * recH;			// 计算文字baseline			canvas.drawText(String.valueOf(begin), text_x, getPaddingTop() + addition_h + fontHeight / 3, mPaint);			begin--;		}	}	private void drawFG(Canvas canvas) {		drawYellowArc(canvas, temp_temperature);		drawYellowRec(canvas, temp_temperature);		drawRecShadow(canvas);		drawCircleShadow(canvas);	}	private void drawCircleShadow(Canvas canvas) {		mPaint.reset();		mPaint.setColor(Color.WHITE);		mPaint.setAntiAlias(true);		mPaint.setAlpha(80);		int radius = (circle_radius - 5) * 2 / 5;		int circle_x = this.width - getPaddingRight() - circle_radius * 3 / 4;		int circle_y = this.height - getPaddingBottom() - circle_radius * 5 / 4;		canvas.drawCircle(circle_x, circle_y, radius, mPaint);	}	private void drawRecShadow(Canvas canvas) {		// mPaint.reset();		// mPaint.setColor(Color.WHITE);		// mPaint.setAntiAlias(true);		// mPaint.setAlpha(50);		//		float begin = 41.2f;		float end = 34.8f;		float totalH = this.height - getPaddingBottom() - circle_radius - circle_radius + 15 - (getPaddingTop() + 5);		float recH = totalH * (begin - end) / (41.5f - 34.5f);		float beginY = getPaddingTop() + (41.5f - begin) / (41.5f - 34.5f) * totalH;		//		Rect r2 = new Rect(); // RectF对象		r2.left = this.width - getPaddingRight() - circle_radius - circle_radius / 3 + 5 + circle_radius / 4; // 左边		r2.top = (int) beginY; // 上边		r2.right = this.width - getPaddingRight() - circle_radius + circle_radius / 3 - 5 - circle_radius / 10; // 右边		r2.bottom = (int) (beginY + recH); // 下边		// canvas.drawRect(r2, mPaint);		Drawable d = getResources().getDrawable(R.drawable.bg_tiwenji_line);		d.setBounds(r2);		d.draw(canvas);	}	private void drawLines(Canvas canvas) {		mPaint.reset();		mPaint.setColor(COLOR_GRAY);		mPaint.setAntiAlias(true);		int line_width = circle_radius * 2 / 3 - 10;		int line_x = this.width - getPaddingRight() - (circle_radius - 5 + circle_radius) - line_width;		float begin = 41.0f;		float recH = this.height - getPaddingBottom() - circle_radius - circle_radius + 15 - (getPaddingTop() + 5);		while (begin >= 35) {			float addition = 41.5f - begin;			float addition_h = addition / (41.5f - 34.5f) * recH;			int temp = (int) begin;			if (begin - temp > 0) {				canvas.drawLine(line_x + line_width * 3f / 4, getPaddingTop() + addition_h, line_x + line_width,						getPaddingTop() + addition_h, mPaint);			} else {				canvas.drawLine(line_x, getPaddingTop() + addition_h, line_x + line_width, getPaddingTop() + addition_h,						mPaint);			}			BigDecimal b1 = new BigDecimal(Float.toString(begin));			BigDecimal b2 = new BigDecimal(Float.toString(0.1f));			begin = b1.subtract(b2).floatValue();		}	}	private void drawYellowRec(Canvas canvas, float temperature2) {		if (temperature2 <= 34)			return;		float addition = temperature2 - 34.5f;		double rate = addition / (41.5d - 34.5d);		if (rate > 1f) {			rate = 1f;		}		rate = 1 - rate;		mPaint.reset();		mPaint.setColor(COLOR_YELLOW);		mPaint.setAntiAlias(true);		float recH = this.height - getPaddingBottom() - circle_radius - circle_radius + 15 - (getPaddingTop() + 5);		RectF r2 = new RectF(); // RectF对象		r2.left = this.width - getPaddingRight() - circle_radius - circle_radius / 3 + 5; // 左边		r2.top = (float) (getPaddingTop() + 5 + recH * rate); // 上边		r2.right = this.width - getPaddingRight() - circle_radius + circle_radius / 3 - 5; // 右边		r2.bottom = this.height - getPaddingBottom() - circle_radius - 5; // 下边		if ((float) (getPaddingTop() + 5 + recH * rate) - 30 >= (getPaddingTop() + 5)) {			canvas.drawRoundRect(r2, 0, 0, mPaint);			RectF r3 = new RectF(); // RectF对象			r3.left = this.width - getPaddingRight() - circle_radius - circle_radius / 3 + 5; // 左边			r3.top = (float) (getPaddingTop() + 5 + recH * rate) - 20; // 上边			r3.right = this.width - getPaddingRight() - circle_radius + circle_radius / 3 - 5; // 右边			r3.bottom = (float) (getPaddingTop() + 5 + recH * rate); // 下边			canvas.drawRoundRect(r3, 0, 0, mPaint);			mPaint.setColor(COLOR_BROWN);			RectF r4 = new RectF(); // RectF对象			r4.left = this.width - getPaddingRight() - circle_radius - circle_radius / 3 + 5; // 左边			r4.top = (float) (getPaddingTop() + 5 + recH * rate) - 30; // 上边			r4.right = this.width - getPaddingRight() - circle_radius + circle_radius / 3 - 5; // 右边			r4.bottom = (float) (getPaddingTop() + 5 + recH * rate); // 下边			canvas.drawRoundRect(r4, 10, 10, mPaint);		} else {			if ((float) (getPaddingTop() + 5 + recH * rate) - 10 >= (getPaddingTop() + 5)) {				canvas.drawRoundRect(r2, 0, 0, mPaint);			} else				canvas.drawRoundRect(r2, 20, 20, mPaint);		}	}	private void drawYellowArc(Canvas canvas, float value) {		mPaint.reset();		mPaint.setColor(COLOR_YELLOW);		mPaint.setAntiAlias(true);		RectF r2 = new RectF(); // RectF对象		r2.left = this.width - getPaddingRight() - (circle_radius - 5 + circle_radius); // 左边		r2.top = this.height - getPaddingBottom() - (circle_radius - 5 + circle_radius); // 上边		r2.right = this.width - getPaddingRight() - 5; // 右边		r2.bottom = this.height - getPaddingBottom() - 5;		if (value <= 34.5f) {			if (value >= 0) {				float angle = (value / 34.5f) * 360;				float start_angle = 90 - angle / 2;				canvas.drawArc(r2, start_angle, angle, false, mPaint);			}		} else {			canvas.drawArc(r2, -90, 360, false, mPaint);		}	}	private void drawBG(Canvas canvas) {		drawWhiteCircle(canvas);		drawWhiteRec(canvas);		drawBrownCircle(canvas);		drawBrownRec(canvas);	}	private void drawBrownRec(Canvas canvas) {		mPaint.reset();		mPaint.setColor(COLOR_BROWN);		mPaint.setAntiAlias(true);		RectF r2 = new RectF(); // RectF对象		r2.left = this.width - getPaddingRight() - circle_radius - circle_radius / 3 + 5; // 左边		r2.top = getPaddingTop() + 5; // 上边		r2.right = this.width - getPaddingRight() - circle_radius + circle_radius / 3 - 5; // 右边		r2.bottom = this.height - getPaddingBottom() - circle_radius - 5; // 下边		canvas.drawRoundRect(r2, 20, 20, mPaint);	}	private void drawBrownCircle(Canvas canvas) {		mPaint.reset();		mPaint.setColor(COLOR_BROWN);		mPaint.setAntiAlias(true);		int brown_radius = circle_radius - 5;		int circle_x = this.width - getPaddingRight() - circle_radius;		int circle_y = this.height - getPaddingBottom() - circle_radius;		canvas.drawCircle(circle_x, circle_y, brown_radius, mPaint);	}	private void drawWhiteRec(Canvas canvas) {		mPaint.reset();		mPaint.setColor(Color.WHITE);		mPaint.setAntiAlias(true);		RectF r2 = new RectF(); // RectF对象		r2.left = this.width - getPaddingRight() - circle_radius - circle_radius / 3; // 左边		r2.top = getPaddingTop(); // 上边		r2.right = this.width - getPaddingRight() - circle_radius + circle_radius / 3; // 右边		r2.bottom = this.height - circle_radius; // 下边		canvas.drawRoundRect(r2, 20, 20, mPaint);	}	private void drawWhiteCircle(Canvas canvas) {		mPaint.reset();		mPaint.setColor(Color.WHITE);		mPaint.setAntiAlias(true);		int circle_x = this.width - getPaddingRight() - circle_radius;		int circle_y = this.height - getPaddingBottom() - circle_radius;		canvas.drawCircle(circle_x, circle_y, circle_radius, mPaint);	}}</pre><pre name="code" class="java">public c