TextView url识别，Spannable的使用

最新推荐文章于 2022-03-10 16:56:06 发布

原创最新推荐文章于 2022-03-10 16:56:06 发布 · 147 阅读

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#ITeye #XML #浏览器

本文介绍如何在Android应用中利用SpannableString实现文本样式定制，包括颜色、粗斜体、下划线、删除线及链接等效果，并展示如何通过自定义IntentSpan实现链接跳转至指定Activity。

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首先看一个链接文本执行流程的大概示意图
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[img]http://dl.iteye.com/upload/attachment/453097/6e68e0f1-9d41-3ecd-a54c-cf3d32cfb7c9.png[/img]

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看了这个流程应该对大概URL, Email等的链接实现有所了解了，所以直接看代码把
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TextView view1 = (TextView) findViewById( R.id.view1 );
TextView view2 = (TextView) findViewById( R.id.view2 );
TextView view3 = (TextView) findViewById( R.id.view3 );
TextView view4 = (TextView) findViewById( R.id.view4 );
TextView view5 = (TextView) findViewById( R.id.view5 );
TextView view6 = (TextView) findViewById( R.id.view6 );

SpannableString text1 = new SpannableString("red");
text1.setSpan(new ForegroundColorSpan(Color.RED), 0, 3, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
view1.setText( text1 );

SpannableString text2 = new SpannableString("green");
text2.setSpan(new BackgroundColorSpan(Color.GREEN), 0, 5, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
view2.setText( text2 );

SpannableString text3 = new SpannableString("i am bold");
text3.setSpan(new StyleSpan(Typeface.BOLD_ITALIC), 5, 9, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
view3.setText( text3 );

SpannableString text4 = new SpannableString("underline");
text4.setSpan(new UnderlineSpan(), 0, 9, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
view4.setText( text4 );

SpannableString text5 = new SpannableString("delete line");
text5.setSpan(new StrikethroughSpan(), 7, 11, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
view5.setText( text5 );

SpannableString text6 = new SpannableString("make a call");
text6.setSpan(new URLSpan("tel:123456789"), 7, 11, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
view6.setText( text6 );
view6.setMovementMethod(LinkMovementMethod.getInstance());

// 还有ImageSpan等

[img]http://dl.iteye.com/upload/attachment/453116/1443eb32-4ecb-33be-afbf-89ed7def841b.png[/img]

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XML布局文件
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<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical"
>
    <TextView
	android:id="@+id/view1"
	android:layout_width="wrap_content"
	android:layout_height="50sp"
	android:gravity="center"
	/>
	<TextView
	android:id="@+id/view2"
	android:layout_width="wrap_content"
	android:layout_height="50sp"
	android:gravity="center"
	/>
	<TextView
	android:id="@+id/view3"
	android:layout_width="wrap_content"
	android:layout_height="50sp"
	android:gravity="center"
	/>
	<TextView
	android:id="@+id/view4"
	android:layout_width="wrap_content"
	android:layout_height="50sp"
	android:gravity="center"
	/>
	<TextView
	android:id="@+id/view5"
	android:layout_width="wrap_content"
	android:layout_height="50sp"
	android:gravity="center"
	/>
	<TextView
	android:id="@+id/view6"
	android:layout_width="wrap_content"
	android:layout_height="50sp"
	android:gravity="center"
	/>
</LinearLayout>

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默认的链接在点击时，只会跳转到响应的View，如点击URL时，打开浏览器，点击电话号码时，打开拨号界面。如果我们要在点击某连接时，跳转到某个Activity呢。

URLSpan继承自ClickableSpan，所以我们的出发点也是这个类，然后重写其中的onClick
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public class IntentSpan extends ClickableSpan implements ParcelableSpan {
	private Intent mIntent;

	public IntentSpan(Intent toActivity) {
		mIntent = toActivity;
	}

	@Override
	public void onClick(View sourceView) {
		Context context = sourceView.getContext();
		context.startActivity( mIntent );
	}

	@Override
	public int getSpanTypeId() {
		return 100;
	}

	@Override
	public int describeContents() {
		return 0;
	}

	@Override
	public void writeToParcel(Parcel dest, int flag) {
		// don't write to parcel
	}

	public Intent getIntent() {
		return mIntent;
	}
}

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使用的话和URLSpan差不多
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SpannableString text6 = new SpannableString("make a call");
Intent intent = new Intent(context, SomActivity.class);
text6.setSpan(new IntentSpan(intent), 7, 11, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
view6.setText( text6 );
view6.setMovementMethod(LinkMovementMethod.getInstance());