下面列出了android.graphics.Paint#ascent ( ) 实例代码，或者点击链接到github查看源代码，也可以在右侧发表评论。
/**
* @since 6.0.3
*/
public void setTextIcon(final String pText) {
final Paint background = new Paint();
background.setColor(mTextLabelBackgroundColor);
final Paint p = new Paint();
p.setTextSize(mTextLabelFontSize);
p.setColor(mTextLabelForegroundColor);
p.setAntiAlias(true);
p.setTypeface(Typeface.DEFAULT_BOLD);
p.setTextAlign(Paint.Align.LEFT);
final int width = (int) (p.measureText(pText) + 0.5f);
final float baseline = (int) (-p.ascent() + 0.5f);
final int height = (int) (baseline + p.descent() + 0.5f);
final Bitmap image = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
final Canvas c = new Canvas(image);
c.drawPaint(background);
c.drawText(pText, 0, baseline, p);
mIcon = new BitmapDrawable(mResources, image);
setAnchor(ANCHOR_CENTER, ANCHOR_CENTER);
}
/**
* 绘制右侧索引条文本
*
* @param canvas
*/
private void onDrawRightIndexText(Canvas canvas) {
L.d(LOGTAG, "onDrawRightIndexText");
// 绘画右侧索引条的字母
Paint indexPaint = new Paint();
indexPaint.setColor(Color.parseColor(COLOR_RIGHT_TEXT));
// indexPaint.setAlpha((int) (255 * mAlphaRate));
indexPaint.setAntiAlias(true);
indexPaint.setTextSize(14 * mScaledDensity);
float sectionHeight = (mIndexbarRect.height() - 2 * mIndexbarMargin)
/ mSections.length;
float paddingTop = (sectionHeight - (indexPaint.descent() - indexPaint
.ascent())) / 2;
for (int i = 0; i < mSections.length; i++) {
float paddingLeft = (mIndexbarWidth - indexPaint
.measureText(mSections[i])) / 2;
canvas.drawText(mSections[i], mIndexbarRect.left + paddingLeft,
mIndexbarRect.top + mIndexbarMargin + sectionHeight * i
+ paddingTop - indexPaint.ascent(), indexPaint);
}
}
private Bitmap getIconFromMinutes(Times t) {
int left = new Period(LocalDateTime.now(), t.getTime(LocalDate.now(), t.getNextTime()), PeriodType.minutes()).getMinutes();
Resources r = getContext().getResources();
int size = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 24, r.getDisplayMetrics());
Bitmap b = Bitmap.createBitmap(size, size, Bitmap.Config.ARGB_8888);
Canvas c = new Canvas(b);
Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);
paint.setColor(0xFFFFFFFF);
paint.setTextAlign(Paint.Align.CENTER);
paint.setTextSize(size);
paint.setTextSize(size * size / paint.measureText((left < 10 ? left * 10 : left) + ""));
float yPos = c.getHeight() / 2f - (paint.descent() + paint.ascent()) / 2;
c.drawText(left + "", size / 2f, yPos, paint);
return b;
}
private Bitmap getIconFromMinutes(Times t) {
int left = new Period(LocalDateTime.now(), t.getTime(LocalDate.now(), t.getNextTime()), PeriodType.minutes()).getMinutes();
Resources r = getContext().getResources();
int size = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 24, r.getDisplayMetrics());
Bitmap b = Bitmap.createBitmap(size, size, Bitmap.Config.ARGB_8888);
Canvas c = new Canvas(b);
Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);
paint.setColor(0xFFFFFFFF);
paint.setTextAlign(Paint.Align.CENTER);
paint.setTextSize(size);
paint.setTextSize(size * size / paint.measureText((left < 10 ? left * 10 : left) + ""));
float yPos = c.getHeight() / 2f - (paint.descent() + paint.ascent()) / 2;
c.drawText(left + "", size / 2f, yPos, paint);
return b;
}
private void drawLanguageOnSpacebar(final Key key, final Canvas canvas, final Paint paint) {
final Keyboard keyboard = getKeyboard();
if (keyboard == null) {
return;
}
final int width = key.getWidth();
final int height = key.getHeight();
paint.setTextAlign(Align.CENTER);
paint.setTypeface(Typeface.DEFAULT);
paint.setTextSize(mLanguageOnSpacebarTextSize);
final String language = layoutLanguageOnSpacebar(paint, keyboard.mId.mSubtype, width);
// Draw language text with shadow
final float descent = paint.descent();
final float textHeight = -paint.ascent() + descent;
final float baseline = height / 2 + textHeight / 2;
paint.setColor(mLanguageOnSpacebarTextColor);
paint.setAlpha(mLanguageOnSpacebarAnimAlpha);
canvas.drawText(language, width / 2, baseline - descent, paint);
paint.clearShadowLayer();
paint.setTextScaleX(1.0f);
}
private Bitmap getFontBitmap() {
Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);
paint.setColor(iconColor);
if (awesomeIconTypeFace != null && !isInEditMode()) {
paint.setTypeface(awesomeIconTypeFace);
paint.setTextSize(iconSize);
} else {
fontIcon = "o";
paint.setTextSize(iconSize - 15);
}
paint.setTextAlign(Paint.Align.LEFT);
float baseline = -paint.ascent(); // ascent() is negative
int width = (int) (paint.measureText(fontIcon) + 0.5f); // round
int height = (int) (baseline + paint.descent() + 0.5f);
Bitmap image = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
Canvas canvas = new Canvas(image);
canvas.drawText(fontIcon, 0, baseline, paint);
return image;
}
/**
* Calculate the bounds for a view's title
*
* @param index
* @param paint
* @return
*/
private Rect calcBounds(int index, Paint paint) {
//Calculate the text bounds
Rect bounds = new Rect();
CharSequence title = getTitle(index);
bounds.right = (int) paint.measureText(title, 0, title.length());
bounds.bottom = (int) (paint.descent() - paint.ascent());
return bounds;
}
/**
* Using the trigonometric Unit Circle, calculate the positions that the text will need to be
* drawn at based on the specified circle radius. Place the values in the textGridHeights and
* textGridWidths parameters.
*/
private static void calculatePositions(Paint paint, float radius, float xCenter, float yCenter,
float textSize, float[] x, float[] y) {
// Adjust yCenter to account for the text's baseline.
paint.setTextSize(textSize);
yCenter -= (paint.descent() + paint.ascent()) / 2;
for (int i = 0; i < NUM_POSITIONS; i++) {
x[i] = xCenter - radius * COS_30[i];
y[i] = yCenter - radius * SIN_30[i];
}
}
/**
* Creates a rounded square of a certain color with
* a character imprinted in white on it.
*
* @param character the character to write on the image.
* @param width the width of the final image.
* @param height the height of the final image.
* @param color the background color of the rounded square.
* @return a valid bitmap of a rounded square with a character on it.
*/
@NonNull
public static Bitmap getRoundedLetterImage(@NonNull Character character, int width, int height, int color) {
Bitmap image = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
Canvas canvas = new Canvas(image);
Paint paint = new Paint();
paint.setColor(color);
Typeface boldText = Typeface.create(Typeface.SANS_SERIF, Typeface.BOLD);
paint.setTypeface(boldText);
paint.setTextSize(Utils.dpToPx(14));
paint.setAntiAlias(true);
paint.setTextAlign(Paint.Align.CENTER);
paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_OVER));
int radius = Utils.dpToPx(2);
RectF outer = new RectF(0, 0, canvas.getWidth(), canvas.getHeight());
canvas.drawRoundRect(outer, radius, radius, paint);
int xPos = (canvas.getWidth() / 2);
int yPos = (int) ((canvas.getHeight() / 2) - ((paint.descent() + paint.ascent()) / 2));
paint.setColor(Color.WHITE);
canvas.drawText(character.toString(), xPos, yPos, paint);
return image;
}
private Bitmap writeTextOnDrawable(int drawableId, String text)
{
Bitmap bm = BitmapFactory.decodeResource(getResources(), drawableId).copy(Bitmap.Config.ARGB_8888, true);
Typeface tf = Typeface.create("Helvetica", Typeface.BOLD);
Paint paint = new Paint();
paint.setStyle(Style.FILL);
paint.setColor(Color.WHITE);
paint.setTypeface(tf);
paint.setTextAlign(Align.CENTER);
paint.setTextSize(convertToPixels(getBaseContext(), 14));
Rect textRect = new Rect();
paint.getTextBounds(text, 0, text.length(), textRect);
Canvas canvas = new Canvas(bm);
//If the text is bigger than the canvas , reduce the font size
if(textRect.width() >= (canvas.getWidth() - 4)) //the padding on either sides is considered as 4, so as to appropriately fit in the text
paint.setTextSize(convertToPixels(getBaseContext(), 7)); //Scaling needs to be used for different dpi's
//Calculate the positions
int xPos = (canvas.getWidth() / 2) - 2; //-2 is for regulating the x position offset
//"- ((paint.descent() + paint.ascent()) / 2)" is the distance from the baseline to the center.
int yPos = (int) ((canvas.getHeight() / 2) - ((paint.descent() + paint.ascent()) / 2) - 10) ;
canvas.drawText(text, xPos, yPos, paint);
return bm;
}
/**
* Calculate the bounds for a view's title
*
* @param index
* @param paint
* @return
*/
private Rect calcBounds(int index, Paint paint) {
//Calculate the text bounds
Rect bounds = new Rect();
CharSequence title = getTitle(index);
bounds.right = (int) paint.measureText(title, 0, title.length());
bounds.bottom = (int) (paint.descent() - paint.ascent());
return bounds;
}
/**
* Calculate the bounds for a view's title
*
* @param index
* @param paint
* @return
*/
private Rect calcBounds(int index, Paint paint) {
//Calculate the text bounds
Rect bounds = new Rect();
CharSequence title = getTitle(index);
bounds.right = (int) paint.measureText(title, 0, title.length());
bounds.bottom = (int) (paint.descent() - paint.ascent());
return bounds;
}
/**
* Calculate the bounds for a view's title
*
* @param index
* @param paint
* @return
*/
private Rect calcBounds(int index, Paint paint) {
//Calculate the text bounds
Rect bounds = new Rect();
CharSequence title = getTitle(index);
bounds.right = (int) paint.measureText(title, 0, title.length());
bounds.bottom = (int) (paint.descent() - paint.ascent());
return bounds;
}
/**
* 绘制中间预览view
*
* @param canvas
*/
private void onDrawMiddlePreview(Canvas canvas) {
L.d(LOGTAG, "onDrawMiddlePreview");
Paint previewPaint = new Paint(); // 用来绘画预览文本背景的画笔
previewPaint.setColor(Color.parseColor(COLOR_MIDDLE_BACKGROUND));// 设置画笔颜色为黑色
previewPaint.setAlpha(96); // 设置透明度
previewPaint.setAntiAlias(true);// 设置抗锯齿
previewPaint.setShadowLayer(3, 0, 0, Color.argb(64, 0, 0, 0)); // 设置阴影层
Paint previewTextPaint = new Paint(); // 用来绘画预览字母的画笔
previewTextPaint.setColor(Color.parseColor(COLOR_MIDDLE_TEXT)); // 设置画笔为白色
previewTextPaint.setAntiAlias(true); // 设置抗锯齿
previewTextPaint.setTextSize(60 * mScaledDensity); // 设置字体大小
// 单个文本的宽度
float previewTextWidth = previewTextPaint
.measureText(mSections[mCurrentSection]);
float previewSize = 2 * mPreviewPadding + previewTextPaint.descent()
- previewTextPaint.ascent();
RectF previewRect = new RectF((mListViewWidth - previewSize) / 2,
(mListViewHeight - previewSize) / 2,
(mListViewWidth - previewSize) / 2 + previewSize,
(mListViewHeight - previewSize) / 2 + previewSize);
// 中间索引的那个框
canvas.drawRoundRect(previewRect, 5 * mDensity, 5 * mDensity,
previewPaint);
// 绘画索引字母
canvas.drawText(mSections[mCurrentSection], previewRect.left
+ (previewSize - previewTextWidth) / 2 - 1, previewRect.top
+ mPreviewPadding - previewTextPaint.ascent() + 1,
previewTextPaint);
}
/**
* Calculate the bounds for a view's title
*
* @param index
* @param paint
* @return
*/
private Rect calcBounds(int index, Paint paint) {
//Calculate the text bounds
Rect bounds = new Rect();
CharSequence title = getTitle(index);
bounds.right = (int) paint.measureText(title, 0, title.length());
bounds.bottom = (int) (paint.descent() - paint.ascent());
return bounds;
}
@Override
public void draw(Canvas canvas, RectF rectF, float x, float y,float strokeWidth,int progress) {
Paint textPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
textPaint.setStrokeWidth(35);
textPaint.setTextSize(textSize);
textPaint.setColor(textColor);
String progressStr = String.valueOf(progress);
float textX = x-(textPaint.measureText(progressStr)/2);
float textY = y-((textPaint.descent()+textPaint.ascent())/2);
canvas.drawText(progressStr,textX,textY,textPaint);
}
/**
* Calculate the bounds for a view's title
*
* @param index
* @param paint
* @return
*/
private Rect calcBounds(int index, Paint paint) {
//Calculate the text bounds
Rect bounds = new Rect();
CharSequence title = getTitle(index);
bounds.right = (int) paint.measureText(title, 0, title.length());
bounds.bottom = (int) (paint.descent() - paint.ascent());
return bounds;
}
public static void updateEntityWidget(Context context, Widget widget) {
Log.d("YouQi", "Widget updateEntityWidget: " + CommonUtil.deflate(widget));
AppWidgetManager appWidgetManager = AppWidgetManager.getInstance(context);
String iconText = widget.getMdiIcon(); //MDIFont.getIcon("mdi:weather-hail");
int iconColor = ResourcesCompat.getColor(context.getResources(), (widget.isToggleable() && !widget.isCurrentStateActive()) ? R.color.md_grey_500 : R.color.xiaomiPrimaryTextSelected, null);
Bitmap myBitmap = Bitmap.createBitmap(160, 160, Bitmap.Config.ARGB_8888);
myBitmap.eraseColor(Color.TRANSPARENT);
Typeface typeface = ResourcesCompat.getFont(context, R.font.mdi);
Paint paint = new Paint();
paint.setFlags(Paint.ANTI_ALIAS_FLAG);
paint.setAntiAlias(true);
paint.setTypeface(typeface);
paint.setColor(iconColor);
paint.setTextSize(160);
//paint.setStrokeWidth(24); // Text Size
//setTextSizeForWidth(paint, 48, iconText);
//paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_OVER)); // Text Overlapping Pattern
Canvas canvas = new Canvas(myBitmap);
int yPos = (int) ((canvas.getHeight() / 2) - ((paint.descent() + paint.ascent()) / 2));
int xPos = (canvas.getWidth() - yPos) / 2;//(canvas.getWidth() / 2);
canvas.drawText(iconText, 0, yPos, paint);
RemoteViews remoteViews = new RemoteViews("com.axzae.homeassistant", R.layout.widget_entity);
remoteViews.setImageViewBitmap(R.id.image_icon, myBitmap);
remoteViews.setTextViewText(R.id.text_state, widget.getFriendlyStateRow());
remoteViews.setTextColor(R.id.text_state, iconColor);
remoteViews.setTextViewText(R.id.text_group, widget.getFriendlyName());
//https://stackoverflow.com/questions/21311917/onreceive-will-always-receive-the-last-appwidgetid-even-different-instance-widg
Intent newIntent = new Intent(context, EntityWidgetProvider.class);
newIntent.setAction(AppWidgetManager.ACTION_APPWIDGET_UPDATE);
newIntent.putExtra("appWidgetId", widget.appWidgetId);
newIntent.putExtra("widget", CommonUtil.deflate(widget));
PendingIntent pendingIntent = PendingIntent.getBroadcast(context, widget.appWidgetId, newIntent, PendingIntent.FLAG_UPDATE_CURRENT);
remoteViews.setOnClickPendingIntent(R.id.item, pendingIntent);
appWidgetManager.updateAppWidget(widget.appWidgetId, remoteViews);
Log.d("YouQi", "appWidgetManager updating (" + widget.appWidgetId + "): " + widget.getFriendlyState());
}
private void drawTextCentered(String text, float x, float y, Paint paint, Canvas canvas) {
float xPos = x - (paint.measureText(text) / 2);
float yPos = (y - ((paint.descent() + paint.ascent()) / 2));
canvas.drawText(text, xPos, yPos, paint);
}
@NonNull
public static Bitmap getRoundedNumberImage(int number, int width, int height, int color, int thickness) {
String text;
if (number > 99) {
text = "\u221E";
} else {
text = String.valueOf(number);
}
Bitmap image = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
Canvas canvas = new Canvas(image);
Paint paint = new Paint();
paint.setColor(color);
Typeface boldText = Typeface.create(Typeface.SANS_SERIF, Typeface.BOLD);
paint.setTypeface(boldText);
paint.setTextSize(Utils.dpToPx(14));
paint.setAntiAlias(true);
paint.setTextAlign(Paint.Align.CENTER);
paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_OVER));
int radius = Utils.dpToPx(2);
RectF outer = new RectF(0, 0, canvas.getWidth(), canvas.getHeight());
canvas.drawRoundRect(outer, radius, radius, paint);
paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.CLEAR));
radius--;
RectF inner = new RectF(thickness, thickness, canvas.getWidth() - thickness, canvas.getHeight() - thickness);
canvas.drawRoundRect(inner, radius, radius, paint);
paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_OVER));
int xPos = (canvas.getWidth() / 2);
int yPos = (int) ((canvas.getHeight() / 2) - ((paint.descent() + paint.ascent()) / 2));
canvas.drawText(String.valueOf(text), xPos, yPos, paint);
return image;
}