Android textView解析HTML Html.fromHtml的使用

测试

<resources>
    <string name="app_name">MyApp</string>

    <string name="str1">恭喜您！您的手机跑分为<font color='#F50057'><big><big><big>888888分</big></big></big></font>，已经超过全国<font color='#00E676'><big><big><big>99%</big></big></big></font>的Android手机。</string>
    <string name="str2"><p>(1).Name:Toking Hazard by Joking Hazard</p><p>(2).Material: Paper</p><p>(3).Package: Box</p><p><br /></p><p>50 Marijuana themed cards to heighten your Joking Hazard experience.<br /></p><p>This is an expansion pack. It requires Joking Hazard to play</p><p>In addition to the cards, there is a secret in each box!</p><p>The box is OVERSIZED to fit the surprise</p><p><br /></p></string>
</resources>

<?xml version="1.0" encoding="utf-8"?>
<androidx.core.widget.NestedScrollView xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical">

        <TextView
            android:id="@+id/tv1"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:background="@android:color/black"
            android:text=""
            android:textColor="@android:color/white"
            android:textSize="13sp" />

        <TextView
            android:id="@+id/tv2"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginTop="20dp"
            android:background="@android:color/black"
            android:text=""
            android:textColor="@android:color/white"
            android:textSize="13sp" />

        <TextView
            android:id="@+id/tv3"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginTop="20dp"
            android:background="@android:color/black"
            android:text=""
            android:textColor="@android:color/white"
            android:textSize="13sp" />

        <TextView
            android:id="@+id/tv4"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginTop="20dp"
            android:background="@android:color/black"
            android:text=""
            android:textColor="@android:color/white"
            android:textSize="13sp" />

        <TextView
            android:id="@+id/tv5"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginTop="20dp"
            android:background="@android:color/black"
            android:text=""
            android:textColor="@android:color/white"
            android:textSize="13sp" />

        <TextView
            android:id="@+id/tv6"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginTop="20dp"
            android:layout_marginBottom="20dp"
            android:background="@android:color/black"
            android:text=""
            android:textColor="@android:color/white"
            android:textSize="13sp" />

    </LinearLayout>

</androidx.core.widget.NestedScrollView>

class MainActivity : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        val content1 =
            "恭喜您！您的手机跑分为<font color='#F50057'><big><big><big>888888分</big></big></big>" +
                    "</font>，已经超过全国<font color='#00E676'>" +
                    "<big><big><big>99%</big></big></big></font>的Android手机。"

        val content2 =
            "<p>(1).Name:Toking Hazard by Joking Hazard</p><p>" +
                    "(2).Material: Paper</p><p>" +
                    "(3).Package: Box</p><p><br/></p>" +
                    "<p>50 Marijuana themed cards to heighten your Joking Hazard experience.<br/></p>" +
                    "<p>This is an expansion pack. It requires Joking Hazard to play</p>" +
                    "<p>In addition to the cards, there is a secret in each box!</p>" +
                    "<p>The box is OVERSIZED to fit the surprise</p><p><br/></p>"

        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
            //FROM_HTML_MODE_COMPACT：html 块元素之间使用一个换行符分隔
            tv1.text = Html.fromHtml(content1, Html.FROM_HTML_MODE_COMPACT)
            //FROM_HTML_MODE_LEGACY：html 块元素之间使用两个换行符分隔
            tv2.text = Html.fromHtml(content1, Html.FROM_HTML_MODE_LEGACY)

            //FROM_HTML_MODE_COMPACT：html 块元素之间使用一个换行符分隔
            tv4.text = Html.fromHtml(content2, Html.FROM_HTML_MODE_COMPACT)
            //FROM_HTML_MODE_LEGACY：html 块元素之间使用两个换行符分隔
            tv5.text = Html.fromHtml(content2, Html.FROM_HTML_MODE_LEGACY)
        } else {
            tv1.text = Html.fromHtml(content1)
            tv2.text = Html.fromHtml(content1)

            tv4.text = Html.fromHtml(content2)
            tv5.text = Html.fromHtml(content2)
        }

        //来自string
        tv3.text = resources.getString(R.string.str1)
        tv6.text = resources.getString(R.string.str2)

    }
}

效果图：

结论：

来自string资源的html文本没有任何效果

Html.fromHtml(“”, Html.FROM_HTML_MODE_COMPACT) : html 块元素之间使用一个换行符分隔

Html.fromHtml(“”, Html.FROM_HTML_MODE_LEGACY) ： html 块元素之间使用两个换行符分隔

注意：

public final void setText(CharSequence text) {
    setText(text, mBufferType);
}

Html.fromHtml 之后不要tostring，否则html效果会有问题 ， setText调用setText(CharSequence text)才是正确的。

public static Spanned fromHtml(String source, int flags) {
    return fromHtml(source, flags, null, null);
}

public interface Spanned
extends CharSequence
{}