我正在使用这个 android库中的文本贴纸。这是textsticker类的代码
public class TextSticker extends Sticker {
/**
* Our ellipsis string.
*/
private static final String mEllipsis = "\u2026";
private final Context context;
private final Rect realBounds;
private final Rect textRect;
private final TextPaint textPaint;
private Drawable drawable;
private StaticLayout staticLayout;
private Layout.Alignment alignment;
private String text;
/**
* Upper bounds for text size.
* This acts as a starting point for resizing.
*/
private float maxTextSizePixels;
/**
* Lower bounds for text size.
*/
private float minTextSizePixels;
/**
* Line spacing multiplier.
*/
private float lineSpacingMultiplier = 1.0f;
/**
* Additional line spacing.
*/
private float lineSpacingExtra = 0.0f;
public TextSticker(@NonNull Context context) {
this(context, null);
}
public TextSticker(@NonNull Context context, @Nullable Drawable drawable) {
this.context = context;
this.drawable = drawable;
if (drawable == null) {
this.drawable = ContextCompat.getDrawable(context, R.drawable.sticker_transparent_background);
}
textPaint = new TextPaint(TextPaint.ANTI_ALIAS_FLAG);
realBounds = new Rect(0, 0, getWidth(), getHeight());
textRect = new Rect(0, 0, getWidth(), getHeight());
minTextSizePixels = convertSpToPx(6);
maxTextSizePixels = convertSpToPx(32);
alignment = Layout.Alignment.ALIGN_CENTER;
textPaint.setTextSize(maxTextSizePixels);
}
@Override public void draw(@NonNull Canvas canvas) {
Matrix matrix = getMatrix();
canvas.save();
canvas.concat(matrix);
if (drawable != null) {
drawable.setBounds(realBounds);
drawable.draw(canvas);
}
canvas.restore();
canvas.save();
canvas.concat(matrix);
if (textRect.width() == getWidth()) {
int dy = getHeight() / 2 - staticLayout.getHeight() / 2;
// center vertical
canvas.translate(0, dy);
} else {
int dx = textRect.left;
int dy = textRect.top + textRect.height() / 2 - staticLayout.getHeight() / 2;
canvas.translate(dx, dy);
}
staticLayout.draw(canvas);
canvas.restore();
}
@Override public int getWidth() {
return drawable.getIntrinsicWidth();
}
@Override public int getHeight() {
return drawable.getIntrinsicHeight();
}
@Override public void release() {
super.release();
if (drawable != null) {
drawable = null;
}
}
@NonNull @Override public TextSticker setAlpha(@IntRange(from = 0, to = 255) int alpha) {
textPaint.setAlpha(alpha);
return this;
}
@NonNull @Override public Drawable getDrawable() {
return drawable;
}
@Override public TextSticker setDrawable(@NonNull Drawable drawable) {
this.drawable = drawable;
realBounds.set(0, 0, getWidth(), getHeight());
textRect.set(0, 0, getWidth(), getHeight());
return this;
}
@NonNull public TextSticker setDrawable(@NonNull Drawable drawable, @Nullable Rect region) {
this.drawable = drawable;
realBounds.set(0, 0, getWidth(), getHeight());
if (region == null) {
textRect.set(0, 0, getWidth(), getHeight());
} else {
textRect.set(region.left, region.top, region.right, region.bottom);
}
return this;
}
@NonNull public TextSticker setTypeface(@Nullable Typeface typeface) {
textPaint.setTypeface(typeface);
return this;
}
@NonNull public TextSticker setTextColor(@ColorInt int color) {
textPaint.setColor(color);
return this;
}
@NonNull public TextSticker setTextAlign(@NonNull Layout.Alignment alignment) {
this.alignment = alignment;
return this;
}
@NonNull public TextSticker setMaxTextSize(@Dimension(unit = Dimension.SP) float size) {
textPaint.setTextSize(convertSpToPx(size));
maxTextSizePixels = textPaint.getTextSize();
return this;
}
/**
* Sets the lower text size limit
*
* @param minTextSizeScaledPixels the minimum size to use for text in this view,
* in scaled pixels.
*/
@NonNull public TextSticker setMinTextSize(float minTextSizeScaledPixels) {
minTextSizePixels = convertSpToPx(minTextSizeScaledPixels);
return this;
}
@NonNull public TextSticker setLineSpacing(float add, float multiplier) {
lineSpacingMultiplier = multiplier;
lineSpacingExtra = add;
return this;
}
@NonNull public TextSticker setText(@Nullable String text) {
this.text = text;
return this;
}
@Nullable public String getText() {
return text;
}
/**
* Resize this view's text size with respect to its width and height
* (minus padding). You should always call this method after the initialization.
*/
@NonNull public TextSticker resizeText() {
final int availableHeightPixels = textRect.height();
final int availableWidthPixels = textRect.width();
final CharSequence text = getText();
// Safety check
// (Do not resize if the view does not have dimensions or if there is no text)
if (text == null
|| text.length() <= 0
|| availableHeightPixels <= 0
|| availableWidthPixels <= 0
|| maxTextSizePixels <= 0) {
return this;
}
float targetTextSizePixels = maxTextSizePixels;
int targetTextHeightPixels =
getTextHeightPixels(text, availableWidthPixels, targetTextSizePixels);
// Until we either fit within our TextView
// or we have reached our minimum text size,
// incrementally try smaller sizes
while (targetTextHeightPixels > availableHeightPixels
&& targetTextSizePixels > minTextSizePixels) {
targetTextSizePixels = Math.max(targetTextSizePixels - 2, minTextSizePixels);
targetTextHeightPixels =
getTextHeightPixels(text, availableWidthPixels, targetTextSizePixels);
}
// If we have reached our minimum text size and the text still doesn't fit,
// append an ellipsis
// (NOTE: Auto-ellipsize doesn't work hence why we have to do it here)
if (targetTextSizePixels == minTextSizePixels
&& targetTextHeightPixels > availableHeightPixels) {
// Make a copy of the original TextPaint object for measuring
TextPaint textPaintCopy = new TextPaint(textPaint);
textPaintCopy.setTextSize(targetTextSizePixels);
// Measure using a StaticLayout instance
StaticLayout staticLayout =
new StaticLayout(text, textPaintCopy, availableWidthPixels, Layout.Alignment.ALIGN_NORMAL,
lineSpacingMultiplier, lineSpacingExtra, false);
// Check that we have a least one line of rendered text
if (staticLayout.getLineCount() > 0) {
// Since the line at the specific vertical position would be cut off,
// we must trim up to the previous line and add an ellipsis
int lastLine = staticLayout.getLineForVertical(availableHeightPixels) - 1;
if (lastLine >= 0) {
int startOffset = staticLayout.getLineStart(lastLine);
int endOffset = staticLayout.getLineEnd(lastLine);
float lineWidthPixels = staticLayout.getLineWidth(lastLine);
float ellipseWidth = textPaintCopy.measureText(mEllipsis);
// Trim characters off until we have enough room to draw the ellipsis
while (availableWidthPixels < lineWidthPixels + ellipseWidth) {
endOffset--;
lineWidthPixels =
textPaintCopy.measureText(text.subSequence(startOffset, endOffset + 1).toString());
}
setText(text.subSequence(0, endOffset) + mEllipsis);
}
}
}
textPaint.setTextSize(targetTextSizePixels);
staticLayout =
new StaticLayout(this.text, textPaint, textRect.width(), alignment, lineSpacingMultiplier,
lineSpacingExtra, true);
return this;
}
/**
* @return lower text size limit, in pixels.
*/
public float getMinTextSizePixels() {
return minTextSizePixels;
}
/**
* Sets the text size of a clone of the view's {@link TextPaint} object
* and uses a {@link StaticLayout} instance to measure the height of the text.
*
* @return the height of the text when placed in a view
* with the specified width
* and when the text has the specified size.
*/
protected int getTextHeightPixels(@NonNull CharSequence source, int availableWidthPixels,
float textSizePixels) {
textPaint.setTextSize(textSizePixels);
// It's not efficient to create a StaticLayout instance
// every time when measuring, we can use StaticLayout.Builder
// since api 23.
StaticLayout staticLayout =
new StaticLayout(source, textPaint, availableWidthPixels, Layout.Alignment.ALIGN_NORMAL,
lineSpacingMultiplier, lineSpacingExtra, true);
return staticLayout.getHeight();
}
/**
* @return the number of pixels which scaledPixels corresponds to on the device.
*/
private float convertSpToPx(float scaledPixels) {
return scaledPixels * context.getResources().getDisplayMetrics().scaledDensity;
}
}
我正在尝试将 textsticker 的坐标保存在父框架布局（lib 的 Sticker View 类）上。我将文本大小保存为 SP。然后在不同的设备上加载相同的坐标时，我将 sp 转换为 px。但问题是贴纸由于某种原因在 x 轴上偏移。基本上，即使我使用 SP 作为单元，它也不会在不同的设备上产生相同的结果。
这是保存坐标的代码
textSizeSp = DensityUtils.px2sp(MainActivity.this, textSizePixel);
这是加载坐标的代码
float sizeInPx = DensityUtils.sp2px(MainActivity.this,
Float.parseFloat(getSizeInSp()));
我对这个库中的 Drawable Sticker 类有同样的问题。但是我通过将位图的密度设置为设备的密度来解决它。但是在 textsticker 中没有位图。静态布局正在画布上呈现。我试图设置静态布局的密度，但它没有任何这样的方法或属性。
知道为什么会这样吗？