Android实现TextView搜索关键字高亮显示

分类：Android, Java 阅读 (967)

3月 222021

转载请注明原文地址：http://bcoder.com/java/highlight-search-keyword-for-textview-in-android

效果图如下：

关键字搜索不区分大小写，TextView换成EditText也同样适用。

Activity部局代码如下：

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

    <EditText
        android:id="@+id/edtKeyword"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginStart="8dp"
        android:layout_marginLeft="8dp"
        android:layout_marginTop="8dp"
        android:layout_marginEnd="8dp"
        android:layout_marginRight="8dp"
        android:ems="10"
        android:inputType="textPersonName"
        app:layout_constraintEnd_toStartOf="@+id/btnSearch"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <Button
        android:id="@+id/btnSearch"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="8dp"
        android:layout_marginEnd="8dp"
        android:layout_marginRight="8dp"
        android:text="搜索"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <TextView
        android:id="@+id/tvContent"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:layout_marginStart="8dp"
        android:layout_marginLeft="8dp"
        android:layout_marginTop="8dp"
        android:layout_marginEnd="8dp"
        android:layout_marginRight="8dp"
        android:layout_marginBottom="8dp"
        android:ems="10"
        android:gravity="start|top"
        android:inputType="textMultiLine"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/edtKeyword" />

</androidx.constraintlayout.widget.ConstraintLayout>

<?xml version="1.0" encoding="utf-8"?>

<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"

xmlns:app="http://schemas.android.com/apk/res-auto"

xmlns:tools="http://schemas.android.com/tools"

android:layout_width="match_parent"

android:layout_height="match_parent"

tools:context=".MainActivity">

<EditText

android:id="@+id/edtKeyword"

android:layout_width="0dp"

android:layout_height="wrap_content"

android:layout_marginStart="8dp"

android:layout_marginLeft="8dp"

android:layout_marginTop="8dp"

android:layout_marginEnd="8dp"

android:layout_marginRight="8dp"

android:ems="10"

android:inputType="textPersonName"

app:layout_constraintEnd_toStartOf="@+id/btnSearch"

app:layout_constraintStart_toStartOf="parent"

app:layout_constraintTop_toTopOf="parent" />

<Button

android:id="@+id/btnSearch"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_marginTop="8dp"

android:layout_marginEnd="8dp"

android:layout_marginRight="8dp"

android:text="搜索"

app:layout_constraintEnd_toEndOf="parent"

app:layout_constraintTop_toTopOf="parent" />

<TextView

android:id="@+id/tvContent"

android:layout_width="0dp"

android:layout_height="0dp"

android:layout_marginStart="8dp"

android:layout_marginLeft="8dp"

android:layout_marginTop="8dp"

android:layout_marginEnd="8dp"

android:layout_marginRight="8dp"

android:layout_marginBottom="8dp"

android:ems="10"

android:gravity="start|top"

android:inputType="textMultiLine"

app:layout_constraintBottom_toBottomOf="parent"

app:layout_constraintEnd_toEndOf="parent"

app:layout_constraintStart_toStartOf="parent"

app:layout_constraintTop_toBottomOf="@+id/edtKeyword" />

</androidx.constraintlayout.widget.ConstraintLayout>

Activity代码如下：

package com.example.highlightstrapp;


import android.app.Activity;
import android.graphics.Color;
import android.os.Bundle;
import android.text.SpannableString;
import android.text.Spanned;
import android.text.style.BackgroundColorSpan;
import android.text.style.ForegroundColorSpan;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;

public class MainActivity extends Activity {
    private EditText edtKeyword;
    private TextView tvContent;
    private Button btnSearch;

    private String mContent = "　　There are moments in life when you miss someone so much that you " +
            "just want to pick them from your dreams and hug them for real! Dream what you want to " +
            "dream;go where you want to go;be what you want to be,because you have only one life " +
            "and one chance to do all the things you want to do.\n" +
            "\n" +
            "　　May you have enough happiness to make you sweet,enough trials to make you strong," +
            "enough sorrow to keep you human,enough hope to make you happy? Always put yourself " +
            "in others’shoes.If you feel that it hurts you,it probably hurts the other person, too.\n" +
            "\n" +
            "　　The happiest of people don’t necessarily have the best of everything;they just " +
            "make the most of everything that comes along their way.Happiness lies for those who " +
            "cry,those who hurt, those who have searched,and those who have tried,for only they " +
            "can appreciate the importance of people";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        initViews();
        initEvents();
    }

    private void initEvents() {
        btnSearch.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                hightStr(edtKeyword.getText().toString(), mContent);
            }
        });
    }

    private void initViews() {
        tvContent = findViewById(R.id.tvContent);
        edtKeyword = findViewById(R.id.edtKeyword);
        btnSearch = findViewById(R.id.btnSearch);
    }

    public void hightStr(String hlStr, String srcString){
        tvContent.setText("");
        String hlLower = hlStr.toLowerCase();
        int lastEnd = 0;
        SpannableString spannableString = new SpannableString(srcString);
        for(int i = 0; i <= srcString.length() - hlStr.length(); i++){
            if(srcString.substring(i, i + hlStr.length()).toLowerCase().equals(hlLower)){
                spannableString.setSpan(new ForegroundColorSpan(Color.RED), i, i + hlStr.length(), Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
                spannableString.setSpan(new BackgroundColorSpan(Color.YELLOW), i, i + hlStr.length(), Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
            }
        }

        tvContent.append(spannableString);
    }

}

package com.example.highlightstrapp;

import android.app.Activity;

import android.graphics.Color;

import android.os.Bundle;

import android.text.SpannableString;

import android.text.Spanned;

import android.text.style.BackgroundColorSpan;

import android.text.style.ForegroundColorSpan;

import android.view.View;

import android.widget.Button;

import android.widget.EditText;

import android.widget.TextView;

public class MainActivity extends Activity {

private EditText edtKeyword;

private TextView tvContent;

private Button btnSearch;

private String mContent = "　　There are moments in life when you miss someone so much that you " +

"just want to pick them from your dreams and hug them for real! Dream what you want to " +

"dream;go where you want to go;be what you want to be,because you have only one life " +

"and one chance to do all the things you want to do.\n" +

"\n" +

"　　May you have enough happiness to make you sweet,enough trials to make you strong," +

"enough sorrow to keep you human,enough hope to make you happy? Always put yourself " +

"in others’shoes.If you feel that it hurts you,it probably hurts the other person, too.\n" +

"\n" +

"　　The happiest of people don’t necessarily have the best of everything;they just " +

"make the most of everything that comes along their way.Happiness lies for those who " +

"cry,those who hurt, those who have searched,and those who have tried,for only they " +

"can appreciate the importance of people";

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

initViews();

initEvents();

}

private void initEvents() {

btnSearch.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View view) {

hightStr(edtKeyword.getText().toString(), mContent);

}

});

}

private void initViews() {

tvContent = findViewById(R.id.tvContent);

edtKeyword = findViewById(R.id.edtKeyword);

btnSearch = findViewById(R.id.btnSearch);

}

public void hightStr(String hlStr, String srcString){

tvContent.setText("");

String hlLower = hlStr.toLowerCase();

int lastEnd = 0;

SpannableString spannableString = new SpannableString(srcString);

for(int i = 0; i <= srcString.length() - hlStr.length(); i++){

if(srcString.substring(i, i + hlStr.length()).toLowerCase().equals(hlLower)){

spannableString.setSpan(new ForegroundColorSpan(Color.RED), i, i + hlStr.length(), Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);

spannableString.setSpan(new BackgroundColorSpan(Color.YELLOW), i, i + hlStr.length(), Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);

}

tvContent.append(spannableString);

}

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