paquete com . hoolai _ erciyuán . ui _ artilugio ; importar android.content.Context ; importar android.graphics.Canvas ; importar android.graphics.Paint ; importar android.graphics.Rect ; importar android.graphics.drawable.Drawable ; importar android.text.style.ImageSpan ; importar java.lang.ref.WeakReference ; /** * Nombre: CenterImageSpan.java * Autor: lilei * Fecha: 2018/5/6 * Comentario: // TODO mostrar imágenes en el centro de gráficos mixtos */ clase pública CenterImageSpan extiende ImageSpan { private WeakReference < Drawable > mDrawableRef ; public CenterImageSpan ( contexto contexto , int resourceId , int verticalAlignment ) { super ( context , resourceId , verticalAlignment ) ; } @Override public int getSize ( Paint paint , CharSequence text , int start , int end , Paint.FontMetricsInt fontMetricsInt ) { Drawable drawable = getDrawable () ; Rect rect = dibujable . obtenerLímites () ; if ( fontMetricsInt != null ) { Paint.FontMetricsInt fmPaint = pintura . getFontMetricsInt () ; int fontHeight = fmPaint . descendencia - pintura fm . ascenso ; int drAltura = rect . inferior - rect . arriba ; int centroY = fmPaint . ascenso + fontHeight / 2 ; fontMetricsInt . ascenso = centerY - drHeight / 2 ; fontMetricsInt . arriba = fontMetricsInt . ascenso ; fontMetricsInt . inferior = centerY + drHeight / 2 ; fontMetricsInt . descenso = fontMetricsInt . fondo ; } devolver rect . derecho ; } @Override public void draw ( Canvas canvas , CharSequence text , int start , int end , float x , int top , int y , int bottom , Paint pintar ) { dibujable dibujable = getCachedDrawable () ; lona _ guardar () ; Paint.FontMetricsInt fmPaint = pintura . getFontMetricsInt () ; int fontHeight = fmPaint . descenso - fmPaint . ascenso ; int centerY = y + fmPaint . descenso - fontHeight / 2 ; En t transY = centerY - ( dibujable . getBounds () . bottom - dibujable . getBounds () . top ) / 2 ; lona _ traducir ( x , transY ) ; dibujable _ dibujar ( lienzo ) ; lona _ restaurar () ; } privado Drawable getCachedDrawable () { WeakReference < Dibujable > wr = mDrawableRef ; Dibujable d = nulo; si ( wr != nulo ) { re = wr . obtener () ; } if ( d == null ) { d = getDrawable ( ) ; mDrawableRef = nueva referencia débil <> ( d ) ; } devuelve d ; } }
Clase ImageSpan integrada
Uso específico
TextView txt_explain = view.findViewById(R.id.txt_personal_dialog_explain); String explain = txt_explain.getText().toString(); int start = explain.length(); String explain_pink = "变色字体"; int end = explain.length() + explain_pink.length(); SpannableString spannableString = new SpannableString(explain + explain_pink); //设置颜色 spannableString.setSpan(new ForegroundColorSpan(Color.parseColor("#ff427b")), start, end, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE); //设置问号 ImageSpan image = new CenterImageSpan(mContext, R.mipmap.ic_question, DynamicDrawableSpan.ALIGN_BASELINE); spannableString.setSpan(image, end - 1, end, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE); txt_explain.setText(spannableString);