换行符（\\n 或 br）使用被 html 忽略的字符串数组项

Question

SOLVED code updated

when I write a text on edit text to be searched on textview it highlights the particular text in colour but the line breaks are all gone and all my sentence appear in one sentence.And this problem appears when I click search for text to be highlighted.Else before I click search it shows all the line breaks.Please help!upvote waiting

// java code
 public void onClick(View v) {
//solved code here
                String textTOHighlight=etText.getText().toString();
                String originalText=textView.getText().toString();
                if(originalText.isEmpty()) return;
                String modifiedText=originalText.replaceAll("\n", "<br />").replaceAll(textTOHighlight, "<font color='red'>"+textTOHighlight+"</font>");
                textView.setText(Html.fromHtml(modifiedText),TextView.BufferType.SPANNABLE);

            }

// string code
<string-array name="chapters">
<item>This is \n first test<item>
<item>this is \n second test<item>
</string-array>

// activity
<EditText
        android:layout_width="100dp"
        android:layout_height="wrap_content"
        android:id="@+id/et_text"
        android:hint="Enter text"
        android:padding="7dp"
        android:layout_marginTop="10dp"
        android:background="@drawable/bg_round"/>
    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/search"
        android:text="Search"
        android:layout_marginTop="10dp"
        android:layout_marginStart="120dp"/>

    <TextView
        android:id="@+id/textv"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_marginTop="90dp"
        android:scrollbars="vertical"
        android:background="@drawable/bg_round"/>

//for example before i input text to search

"this is first test"

//but after I input text to search it highlights particular text but shows without new line

"this is first test"

//all i did was on each button click go to specific chapter.By the way this portion has nothing to do.
 @Override
    public void onClick(View v) {
//solved code
        String text="";
        switch(v.getId()){
            case R.id.btn1 : {
                 text = getResources().getStringArray(R.array.chapters)[0].replaceAll("\n", "<br />");
                break;
            }
            case R.id.button1 : {
                text = getResources().getStringArray(R.array.chapters)[1].replaceAll("\n", "<br />");
                break;
            }
        }

Answer 1

New edit

Try a new one,

Use this as it is

// string code
<string-array name="chapters">
    <item>This is \n first test<item>
    <item>this is \n second test<item>
</string-array>

And,

@Override
public void onClick(View v) {
    String text="";
    switch(v.getId()){
        case R.id.btn1 : {
            text = getResources().getStringArray(R.array.chapters)[0].replaceAll("\n", "<br />"));
            break;
        }
        case R.id.button1 : {
            text = getResources().getStringArray(R.array.chapters)[1].replaceAll("\n", "<br />"));
            break;
        }
    }
}

Try this sample code

MainActivity.java

import android.os.Bundle;
import android.text.Html;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;

import androidx.appcompat.app.AppCompatActivity;

public class MainActivity extends AppCompatActivity {

    protected void onCreate(Bundle SavedInstanceState) {
        super.onCreate(SavedInstanceState);
        setContentView(R.layout.activity_main);

        final EditText edt = findViewById(R.id.edt);
        final TextView tv = findViewById(R.id.tv);
        Button btn = findViewById(R.id.btn);

        tv.setText(Html.fromHtml(getResources().getStringArray(R.array.chapters)[0].replaceAll("\n", "<br />")), TextView.BufferType.SPANNABLE);

        btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                String textTOHighlight = edt.getText().toString();
                String originalText = tv.getText().toString();

                if(originalText.isEmpty()) return;

                String modifiedText = originalText.replaceAll("\n", "<br />").replaceAll(textTOHighlight, "<font color='red'>" + textTOHighlight + "</font>");
                tv.setText(Html.fromHtml(modifiedText),TextView.BufferType.SPANNABLE);
            }
        });
    }
}

*activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <EditText
        android:id="@+id/edt"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="10dp"
        android:background="#ffffff"
        android:hint="Enter text"
        android:padding="7dp"
        android:textColor="#000000"
        android:textSize="16sp" />

    <Button
        android:id="@+id/btn"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/edt"
        android:layout_marginTop="10dp"
        android:background="#C29090"
        android:text="Search" />

    <TextView
        android:id="@+id/tv"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_below="@+id/btn"
        android:layout_marginTop="90dp"
        android:background="#474747"
        android:scrollbars="vertical"
        android:textColor="#ffffff"
        android:textSize="16sp" />
</RelativeLayout>

strings.xml

 <resources>
     <string name="app_name">My Application</string>

     <string-array name="chapters">
        <item>This is \n first test</item>
        <item>this is \n second test</item>
    </string-array>
</resources>

Hope it will work out :)

Answer 2

//first output

This is <br /> first test

//Now when i enter text to search it shows correctly

This is
first test

//Now if i enter another text to search it ignores the line break again

This is first test

// using this solved
Spanned htmlText = Html.fromHtml(text);
textView.setText(htmlText);