android 各種 span的生成 如:修改TextView中部分文字的顏色 ,生成圖片span
阿新 • • 發佈:2019-01-09
textView = (TextView) findViewById(R.id.textview); SpannableStringBuilder builder = new SpannableStringBuilder(textView.getText().toString()); //ForegroundColorSpan 為文字前景色,BackgroundColorSpan為文字背景色 ForegroundColorSpan redSpan = new ForegroundColorSpan(Color.RED); ForegroundColorSpan whiteSpan = new ForegroundColorSpan(Color.WHITE); ForegroundColorSpan blueSpan = new ForegroundColorSpan(Color.BLUE); ForegroundColorSpan greenSpan = new ForegroundColorSpan(Color.GREEN); ForegroundColorSpan yellowSpan = new ForegroundColorSpan(Color.YELLOW); builder.setSpan(redSpan, 0, 1, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE); builder.setSpan(whiteSpan, 1, 2, Spannable.SPAN_INCLUSIVE_INCLUSIVE); builder.setSpan(blueSpan, 2, 3, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE); builder.setSpan(greenSpan, 3, 4, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE); builder.setSpan(yellowSpan, 4,5, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE); textView.setText(builder);
2) BackgroundColorSpan文字背景色
private void setBackgroundColorSpan() { SpannableString spanString = new SpannableString("背景色"); BackgroundColorSpan span = new BackgroundColorSpan(Color.YELLOW); spanString.setSpan(span, 0, 3, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE); tv.append(spanString); }
3) StyleSpan 字型樣式:粗體、斜體等
private void setStyleSpan() {
SpannableString spanString = new SpannableString("粗體斜體");
StyleSpan span = new StyleSpan(Typeface.BOLD_ITALIC);
spanString.setSpan(span, 0, 4, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
tv.append(spanString);
}
4)RelativeSizeSpan
相對大小
private void setRelativeFontSpan() {
SpannableString spanString = new SpannableString("字型相對大小");
spanString.setSpan(new RelativeSizeSpan(2.5f), 0, 6,Spannable.SPAN_INCLUSIVE_EXCLUSIVE);
tv.append(spanString);
}
5) TypefaceSpan 文字字型
private void setTypefaceSpan() {
SpannableString spanString = new SpannableString("文字字型");
spanString.setSpan(new TypefaceSpan("monospace"), 0, 4, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
tv.append(spanText);
}
6) URLSpan 文字超連結
private void addUrlSpan() {
SpannableString spanString = new SpannableString("超連結");
URLSpan span = new URLSpan("http://www.baidu.com");
spanString.setSpan(span, 0, 3, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
tv.append(spanString);
}
7) ImageSpan 圖片
private void addImageSpan() {
SpannableString spanString = new SpannableString("3 ");
Drawable d = getResources().getDrawable(R.drawable.ic_launcher);
d.setBounds(0, 0, d.getIntrinsicWidth(), d.getIntrinsicHeight());
ImageSpan span = new ImageSpan(d, ImageSpan.ALIGN_BASELINE);
spanString.setSpan(span, 0, 1, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
tv.append(spanString);
}
注意new SpannableString後面 添加了"3空格"3是的佔位符號隨意, 空格一定要有的,不然回到導致下面BUG:
1.連續輸入多次imageSpan的時候:在換行的時候,會導致上面的一行ImageSpan消失
下面是我自己使用的方法,發現這個Bitmap轉換成ImageSpan,比較精確的高度
/**
* 將文字 生成 文字圖片 生成顯示編碼的Bitmap,目前這個方法是可用的
*
* @param contents
* @param context
* @return
*/
public static Bitmap creatCodeBitmap(String contents ,Context context) {
float scale=context.getResources().getDisplayMetrics().scaledDensity;
TextView tv = new TextView(context);
LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(
LinearLayout.LayoutParams.MATCH_PARENT,
LinearLayout.LayoutParams.WRAP_CONTENT);
tv.setLayoutParams(layoutParams);
tv.setText(contents);
tv.setTextSize(scale*12);
tv.setGravity(Gravity.CENTER_HORIZONTAL);
tv.setDrawingCacheEnabled(true);
tv.setTextColor(Color.BLACK);
tv.measure(MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED),
MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED));
tv.layout(0, 0, tv.getMeasuredWidth(), tv.getMeasuredHeight());
tv.setBackgroundColor(Color.GREEN);
tv.buildDrawingCache();
Bitmap bitmapCode = tv.getDrawingCache();
return bitmapCode;
}
8) ClickableSpan 文字有點選事件
private TextView textView;
textView = (TextView)this.findViewById(R.id.textView);
String text = "顯示Activity";
SpannableString spannableString = new SpannableString(text);
spannableString.setSpan(new ClickableSpan() {
@Override
public void onClick(View widget) {
Intent intent = new Intent(Main.this,OtherActivity.class);
startActivity(intent);
}
// 表示點選整個text的長度都有效觸發這個事件
}, 0, text.length(), Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
textView.setText(spannableString);
textView.setMovementMethod(LinkMovementMethod.getInstance());
9) UnderlineSpan 下劃線
private void addUnderLineSpan() {
SpannableString spanString = new SpannableString("下劃線");
UnderlineSpan span = new UnderlineSpan();
spanString.setSpan(span, 0, 3, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
tv.append(spanString);
}
10) StrikethroughSpan 刪除線
private void addStrikeSpan() {
SpannableString spanString = new SpannableString("刪除線");
StrikethroughSpan span = new StrikethroughSpan();
spanString.setSpan(span, 0, 3, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
tv.append(spanString);
}
11) SuggestionSpan 相當於佔位符
12) MaskFilterSpan 修飾效果,如模糊(BlurMaskFilter)、浮雕(EmbossMaskFilter)
13) RasterizerSpan 光柵效果
14) AbsoluteSizeSpan 絕對大小(文字字型)
private void setAbsoluteFontSpan() {
SpannableString spannableString = new SpannableString("40號字型");
AbsoluteSizeSpan absoluteSizeSpan = new AbsoluteSizeSpan(40);
spannableString.setSpan(absoluteSizeSpan, 0, 5, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
editText.append(spannableString);
}
15) DynamicDrawableSpan 設定圖片,基於文字基線或底部對齊。
16) TextAppearanceSpan 文字外貌(包括字型、大小、樣式和顏色)
private void setTextAppearanceSpan() {
SpannableString spanString = new SpannableString("文字外貌");
TextAppearanceSpan textAppearanceSpan = new TextAppearanceSpan(this, android.R.style.TextAppearance_Medium);
spanString.setSpan(textAppearanceSpan, 0, 4, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
tv.append(spanString);
}