尽管设置属性,但画布绘图未正确绘制
Mac*_*ver 7 java xml android android-layout android-canvas
我刚刚制作了2张图纸,试图让其中一张看起来与另一张相同,但我没有运气.关于屏幕截图,顶部的绘图是使用画布创建的,底部的绘图是使用XML创建的.XML绘图对我来说是完美的,但不幸的是根据Android,我不应该使用它,因为它返回"太多视图"警告.我已经尝试了以下方法用于画布绘制,但我仍然没有得到所需的结果.
我已经在十几个仿真器上测试了这个项目,尽管XML绘图有很多视图,但它们都只需要一秒钟就能显示出来.
- 根据设备的方向使用不同的图纸
- 使用浮点值而不是整数
- 多次调整浮动值
有没有人知道有什么其他选项可以解决这个恼人的画布问题,并确保画布绘图看起来与XML绘图完全相同,无论屏幕大小和方向如何？此情景中是否应忽略"太多视图"警告和/或我将查看次数限制增加到80以上？所有相关的帮助将受到高度赞赏.
Java代码
XML代码
在下面,您可以在处理代码后查看结果.它几乎与xml类似,但是如果你用mignifier看它,你可以找到一些差异.
所以当你画画时有一些重要的事情.
- 不要使用int.你正在失去精确度.我将所有int替换为代码中的float.
- 循环时要小心.你也在循环中失去精确度.
代码中的常见模式:
float boxWidth = (getWidth() - mSideRectWidth) / 8; // I replaced int to float
for (int i = 0; i < 8; i++) {
float position = i * boxWidth; // loss of precision
...
}
最好在循环中计算位置:
for (int i = 0; i < 8; i++) {
float position = i * (getWidth() - mSideRectWidth) / 8;
...
}
- 不要忘记笔画宽度.在计算形状和线条的位置时,您会错过该值.
这是我的完整代码:
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.RectF;
import android.text.TextPaint;
import android.util.AttributeSet;
import android.util.TypedValue;
import android.view.View;
public class Car extends View {
private final Paint mBlackPaint = new Paint();
private final Paint mRedPaint = new Paint();
private final TextPaint mTextPaint;
public static final int BOXES_COUNT = 8;
private float oneDp;
private float textSize;
private float windowHeight;
public Car(Context context, AttributeSet attrs) {
super(context, attrs);
oneDp = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 1,
getResources().getDisplayMetrics());
windowHeight = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 10,
getResources().getDisplayMetrics());
textSize = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_SP, 15,
getResources().getDisplayMetrics());
mRedPaint.setColor(Color.parseColor("#CC3333"));
mBlackPaint.setAntiAlias(true);
mBlackPaint.setColor(Color.BLACK);
mBlackPaint.setStrokeWidth(oneDp);
mBlackPaint.setStyle(Paint.Style.STROKE);
mTextPaint = new TextPaint(TextPaint.ANTI_ALIAS_FLAG);
mTextPaint.setColor(Color.BLACK);
mTextPaint.setTextAlign(Paint.Align.CENTER);
mTextPaint.setTextSize(textSize);
mWindowPaint = new Paint();
mWindowPaint.setAntiAlias(true);
mWindowPaint.setColor(Color.parseColor("#CC3333"));
mWindowPaint.setStyle(Paint.Style.STROKE);
mWindowPaint.setStrokeWidth(oneDp);
}
private Paint mWindowPaint;
RectF rect = new RectF();
RectF rect2 = new RectF();
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
if (getWidth() == 0) return;
int w = canvas.getWidth();
int h = canvas.getHeight();
//draw red rectangles
float mSideRectWidth = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 5,
getResources().getDisplayMetrics());
canvas.drawRect(0, 0, mSideRectWidth, getHeight(), mRedPaint); //draw left end rectangle
canvas.drawRect(getWidth() - mSideRectWidth, 0, getWidth(), getHeight(),
mRedPaint); //draw right end rectangle
//draw grey boxes
setBackgroundColor(Color.parseColor("#808080"));
for (int i = 0; i < BOXES_COUNT; i++) {
float leftPosition = mSideRectWidth
+ i * oneDp
+ (getWidth() - mSideRectWidth * 2 - (BOXES_COUNT - 1) * oneDp) * i / BOXES_COUNT;
float rightPosition = mSideRectWidth
+ i * oneDp
+ (getWidth() - mSideRectWidth * 2 - (BOXES_COUNT - 1) * oneDp) * (i + 1)
/ BOXES_COUNT;
if (i == 0) {
fillRectLeft(canvas, leftPosition, rightPosition, (i + 1) + "");
} else if ( i == BOXES_COUNT - 1) {
fillRectRight(canvas, leftPosition, rightPosition, (i + 1) + "");
} else {
fillRect(canvas, leftPosition, rightPosition, (i + 1) + "");
}
}
//draw black lines
for (int i = 1; i < BOXES_COUNT; i++) {
float position = mSideRectWidth + (getWidth() - mSideRectWidth * 2) * i / BOXES_COUNT;
canvas.drawLine(position, 0, position, getHeight(), mBlackPaint);
}
}
private void fillRect(Canvas canvas, float left, float right, String number) {
rect.set(left + oneDp / 2, 0 + oneDp / 2, right - oneDp / 2, getHeight() - oneDp / 2);
float xPos = left + ((right - left) / 2);
float yPos = (canvas.getHeight() / 2) - ((mTextPaint.descent() + mTextPaint.ascent()) / 2);
//((textPaint.descent() + textPaint.ascent()) / 2) is the distance from the baseline to the center.
canvas.drawText(number, xPos, yPos, mTextPaint);
//canvas.drawRect(rect, mWindowPaint);
// top row
rect2.set(left + oneDp / 2, 0 + oneDp / 2, left + (right - left) * 20 / 100 - oneDp / 2,
windowHeight - oneDp / 2);
canvas.drawRect(rect2, mWindowPaint);
rect2.set(left + (right - left) * 27 / 100 + oneDp / 2, 0 + oneDp / 2,
left + (right - left) * 47 / 100 - oneDp / 2, windowHeight - oneDp / 2);
canvas.drawRect(rect2, mWindowPaint);
rect2.set(left + (right - left) * 53 / 100 + oneDp / 2, 0 + oneDp / 2,
left + (right - left) * 73 / 100 - oneDp / 2, windowHeight - oneDp / 2);
canvas.drawRect(rect2, mWindowPaint);
rect2.set(left + (right - left) * 80 / 100 + oneDp / 2, 0 + oneDp / 2,
left + (right - left) * 100 / 100 - oneDp / 2, windowHeight - oneDp / 2);
canvas.drawRect(rect2, mWindowPaint);
// bottom row
rect2.set(left + oneDp / 2, getHeight() - windowHeight + oneDp / 2,
left + (right - left) * 20 / 100 - oneDp / 2, getHeight() - oneDp / 2);
canvas.drawRect(rect2, mWindowPaint);
rect2.set(left + (right - left) * 27 / 100 + oneDp / 2,
getHeight() - windowHeight + oneDp / 2, left + (right - left) * 47 / 100 - oneDp / 2,
getHeight() - oneDp / 2);
canvas.drawRect(rect2, mWindowPaint);
rect2.set(left + (right - left) * 53 / 100 + oneDp / 2,
getHeight() - windowHeight + oneDp / 2, left + (right - left) * 73 / 100 - oneDp / 2,
getHeight() - oneDp / 2);
canvas.drawRect(rect2, mWindowPaint);
rect2.set(left + (right - left) * 80 / 100 + oneDp / 2,
getHeight() - windowHeight + oneDp / 2, left + (right - left) * 100 / 100 - oneDp / 2,
getHeight() - oneDp / 2);
canvas.drawRect(rect2, mWindowPaint);
}
private void fillRectLeft(Canvas canvas, float left, float right, String number) {
rect.set(left + oneDp / 2, 0 + oneDp / 2, right - oneDp / 2, getHeight() - oneDp / 2);
float xPos = left + ((right - left) / 2);
float yPos = (canvas.getHeight() / 2) - ((mTextPaint.descent() + mTextPaint.ascent()) / 2);
//((textPaint.descent() + textPaint.ascent()) / 2) is the distance from the baseline to the center.
canvas.drawText(number, xPos, yPos, mTextPaint);
//canvas.drawRect(rect, mWindowPaint);
// top row
rect2.set(left + (right - left) * 4 / 100 + oneDp / 2, 0 + oneDp / 2,
left + (right - left) * 24 / 100 - oneDp / 2, windowHeight - oneDp / 2);
canvas.drawRect(rect2, mWindowPaint);
rect2.set(left + (right - left) * 42 / 100 + oneDp / 2, 0 + oneDp / 2,
left + (right - left) * 62 / 100 - oneDp / 2, windowHeight - oneDp / 2);
canvas.drawRect(rect2, mWindowPaint);
rect2.set(left + (right - left) * 80 / 100 + oneDp / 2, 0 + oneDp / 2,
left + (right - left) * 100 / 100 - oneDp / 2, windowHeight - oneDp / 2);
canvas.drawRect(rect2, mWindowPaint);
// bottom row
rect2.set(left + (right - left) * 4 / 100 + oneDp / 2,
getHeight() - windowHeight + oneDp / 2, left + (right - left) * 24 / 100 - oneDp / 2,
getHeight() - oneDp / 2);
canvas.drawRect(rect2, mWindowPaint);
rect2.set(left + (right - left) * 42 / 100 + oneDp / 2,
getHeight() - windowHeight + oneDp / 2, left + (right - left) * 62 / 100 - oneDp / 2,
getHeight() - oneDp / 2);
canvas.drawRect(rect2, mWindowPaint);
rect2.set(left + (right - left) * 80 / 100 + oneDp / 2,
getHeight() - windowHeight + oneDp / 2, left + (right - left) * 100 / 100 - oneDp / 2,
getHeight() - oneDp / 2);
canvas.drawRect(rect2, mWindowPaint);
}
private void fillRectRight(Canvas canvas, float left, float right, String number) {
rect.set(left + oneDp / 2, 0 + oneDp / 2, right - oneDp / 2, getHeight() - oneDp / 2);
float xPos = left + ((right - left) / 2);
float yPos = (canvas.getHeight() / 2) - ((mTextPaint.descent() + mTextPaint.ascent()) / 2);
//((textPaint.descent() + textPaint.ascent()) / 2) is the distance from the baseline to the center.
canvas.drawText(number, xPos, yPos, mTextPaint);
//canvas.drawRect(rect, mWindowPaint);
// top row
rect2.set(left + (right - left) * 0 / 105 + oneDp / 2, 0 + oneDp / 2,
left + (right - left) * 20 / 105 - oneDp / 2, windowHeight - oneDp / 2);
canvas.drawRect(rect2, mWindowPaint);
rect2.set(left + (right - left) * 38 / 105 + oneDp / 2, 0 + oneDp / 2,
left + (right - left) * 58 / 105 - oneDp / 2, windowHeight - oneDp / 2);
canvas.drawRect(rect2, mWindowPaint);
rect2.set(left + (right - left) * 78 / 105 + oneDp / 2, 0 + oneDp / 2,
left + (right - left) * 98 / 105 - oneDp / 2, windowHeight - oneDp / 2);
canvas.drawRect(rect2, mWindowPaint);
// bottom row
rect2.set(left + (right - left) * 0 / 105 + oneDp / 2,
getHeight() - windowHeight + oneDp / 2, left + (right - left) * 20 / 105 - oneDp / 2,
getHeight() - oneDp / 2);
canvas.drawRect(rect2, mWindowPaint);
rect2.set(left + (right - left) * 38 / 105 + oneDp / 2,
getHeight() - windowHeight + oneDp / 2, left + (right - left) * 58 / 105 - oneDp / 2,
getHeight() - oneDp / 2);
canvas.drawRect(rect2, mWindowPaint);
rect2.set(left + (right - left) * 78 / 105 + oneDp / 2,
getHeight() - windowHeight + oneDp / 2, left + (right - left) * 98 / 105 - oneDp / 2,
getHeight() - oneDp / 2);
canvas.drawRect(rect2, mWindowPaint);
}
}
肖像
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