Android学习笔记__TextView关键字高亮与超链接

目的:

将TextView里文本中的某些关键字高亮,并且设置超链接,可以进行页面的跳转


实现方法:

使用SpannableString,采用正则表达来搜索文本中的关键字;

设置关键字的超链接通过重写ClickableSpan来实现


		// 加载文章内容高亮多个关键字,只高亮一个关键字去掉循环
		String[] keywords = new String[] { "power", "internet" };
		SpannableString s = new SpannableString(getResources().getString(
				R.string.papercontent));
		for (int i = 0; i < keywords.length; i++) {
			Pattern p = Pattern.compile(keywords[i] + "\\W");
			Matcher m = p.matcher(s);
			while (m.find()) {
				int start = m.start();
				int end = m.end() - 1;
				Intent intent = new Intent(getApplicationContext(),
						KeyWord.class);
				s.setSpan(new IntentSpan(intent), start, end,
						Spannable.SPAN_EXCLUSIVE_INCLUSIVE);
			}
		}
		tvContent.setText(s);
		tvContent.setMovementMethod(LinkMovementMethod.getInstance());


	/**
	 * 重写ClickableSpan中的onClick,实现点击效果
	 * @author zengjiyang
	 */
	public class IntentSpan extends ClickableSpan implements ParcelableSpan {
		private Intent mIntent;

		public IntentSpan(Intent mIntent) {
			super();
			this.mIntent = mIntent;
		}

		@Override
		public int describeContents() {
			// TODO Auto-generated method stub
			return 0;
		}

		@Override
		public void writeToParcel(Parcel dest, int flags) {
			// TODO Auto-generated method stub
		}

		@Override
		public int getSpanTypeId() {
			// TODO Auto-generated method stub
			return 100;
		}

		@Override
		public void onClick(View widget) {
			// TODO Auto-generated method stub
			Context context = widget.getContext();
			context.startActivity(mIntent);
		}

		@Override
		public void updateDrawState(TextPaint ds) {
			// TODO Auto-generated method stub
			super.updateDrawState(ds);
			ds.setColor(Color.RED);
			ds.setUnderlineText(false);
			ds.bgColor = Color.TRANSPARENT;
		}

	}

PS:目前就这些,日后再补充


你可能感兴趣的:(Android学习笔记)