适用于 Spannable 的 Android 填充? [英] Android paddings for Spannable?
本文介绍了适用于 Spannable 的 Android 填充?的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我使用此代码为 TextView 中的一段文本设置背景:
I use this code to set background for piece of text inside TextView:
s.setSpan(new BackgroundColorSpan(getResources().getColor(R.color.selection_blue)), prevIndex, index, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
但我也需要为这个文本设置填充.可能吗?
But I need to set padding for this text too. Is it possible?
推荐答案
您可以使用 ReplacementSpan
.在您的活动中:
You can use ReplacementSpan
.
In your Activity:
TextView tagsTextView = (TextView) mView.findViewById(R.id.tagsTextView);
SpannableStringBuilder stringBuilder = new SpannableStringBuilder();
SpannableString tag = new SpannableString("TEST");
stringBuilder.append(tag);
stringBuilder.setSpan(new TagSpan(getResources().getColor(R.color.blue), getResources().getColor(R.color.white)), stringBuilder.length() - tag.length(), stringBuilder.length(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
tagsTextView.setText(stringBuilder, TextView.BufferType.SPANNABLE);
TagSpan.java
TagSpan.java
public class TagSpan extends ReplacementSpan {
private static final float PADDING = 50.0f;
private RectF mRect;
private int mBackgroundColor;
private int mForegroundColor;
public TagSpan(int backgroundColor, int foregroundColor) {
this.mRect = new RectF();
this.mBackgroundColor = backgroundColor;
this.mForegroundColor = foregroundColor;
}
@Override
public void draw(Canvas canvas, CharSequence text, int start, int end, float x, int top, int y, int bottom, Paint paint) {
// Background
mRect.set(x, top, x + paint.measureText(text, start, end) + PADDING, bottom);
paint.setColor(mBackgroundColor);
canvas.drawRect(mRect, paint);
// Text
paint.setColor(mForegroundColor);
int xPos = Math.round(x + (PADDING / 2));
int yPos = (int) ((canvas.getHeight() / 2) - ((paint.descent() + paint.ascent()) / 2)) ;
canvas.drawText(text, start, end, xPos, yPos, paint);
}
@Override
public int getSize(Paint paint, CharSequence text, int start, int end, FontMetricsInt fm) {
return Math.round(paint.measureText(text, start, end) + PADDING);
}
}
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