网上很多文字用到的都很老了，废弃了，我集成之后报很多错，运行不了。

下面是给出自己看最新文档集成的。

1、注册登录Firebase
https://console.firebase.google.com/project/obexclientbase/ml?hl=zh-cn

2、创建Firebase项目绑定 Android应用

3、找到机器学习（查看所有构建功能）

4、进入查看文档

5、收费，选择 独立机器学习套件库

6、集成

项目 build.gradle

plugins {
    id 'com.google.gms.google-services' version '4.3.15' apply false
}

app (我用的module) 的 build.gradle

plugins {
    // Firebase ML Kit
    id 'com.google.gms.google-services'
}

dependencies {
    /*implementation 'androidx.appcompat:appcompat:1.6.1'
    implementation 'com.google.android.material:material:1.8.0'
    testImplementation 'junit:junit:4.13.2'
    androidTestImplementation 'androidx.test.ext:junit:1.1.5'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.5.1'*/

    // Firebase ML Kit
    implementation platform('com.google.firebase:firebase-bom:32.7.0')

    // TODO: Add the dependencies for Firebase products you want to use
    // When using the BoM, don't specify versions in Firebase dependencies
    // https://firebase.google.com/docs/android/setup#available-libraries

    // Firebase ML Kit 实现文字识别功能
    // To recognize Chinese script
    implementation 'com.google.mlkit:text-recognition-chinese:16.0.0'
}

如果你也用的 module ，会报错：No client found ...
这是因为你在Firebase添加的项目包名与你当前module namespace不一样，把namespace改成Firebase那个

package com.project.imagerecognizelib;

import android.graphics.Bitmap;
import android.graphics.Point;
import android.graphics.Rect;
import android.util.Log;
import androidx.annotation.NonNull;
import com.google.android.gms.tasks.OnFailureListener;
import com.google.android.gms.tasks.OnSuccessListener;
import com.google.android.gms.tasks.Task;
import com.google.mlkit.vision.common.InputImage;
import com.google.mlkit.vision.text.Text;
import com.google.mlkit.vision.text.TextRecognition;
import com.google.mlkit.vision.text.TextRecognizer;
import com.google.mlkit.vision.text.chinese.ChineseTextRecognizerOptions;

public class TextRecognizeManager {

    private TextRecognizer textRecognizer;

    public TextRecognizeManager() {
        // When using Chinese script library
        textRecognizer = TextRecognition.getClient(new ChineseTextRecognizerOptions.Builder().build());
    }


    public void recognize(Bitmap bitmap) {
        InputImage image = InputImage.fromBitmap(bitmap, 0);
        Task<Text> result = textRecognizer.process(image)
                        .addOnSuccessListener(new OnSuccessListener<Text>() {
                            @Override
                            public void onSuccess(Text visionText) {
                                handleVisionText(visionText);
                            }
                        }).addOnFailureListener(new OnFailureListener() {
                            @Override
                            public void onFailure(@NonNull Exception e) {
                                Log.d("", "识别失败");
                                e.printStackTrace();
                            }
                        });
    }

    private void handleVisionText(Text result) {
        String resultText = result.getText();
        for (Text.TextBlock block : result.getTextBlocks()) {
            String blockText = block.getText();
            Point[] blockCornerPoints = block.getCornerPoints();
            Rect blockFrame = block.getBoundingBox();
            for (Text.Line line : block.getLines()) {
                String lineText = line.getText();
                Log.d("", "识别文本： " + lineText);
                /*Point[] lineCornerPoints = line.getCornerPoints();
                Rect lineFrame = line.getBoundingBox();
                for (Text.Element element : line.getElements()) {
                    String elementText = element.getText();
                    Point[] elementCornerPoints = element.getCornerPoints();
                    Rect elementFrame = element.getBoundingBox();
                    for (Text.Symbol symbol : element.getSymbols()) {
                        String symbolText = symbol.getText();
                        Point[] symbolCornerPoints = symbol.getCornerPoints();
                        Rect symbolFrame = symbol.getBoundingBox();
                    }
                }*/
            }
        }
    }

}

找个地方测试一下就可以了

    private var textRecognizer: TextRecognizeManager? = null
    private fun test() {
        val bitmap = BitmapFactory.decodeResource(resources, R.drawable.test)
        if (textRecognizer == null)
            textRecognizer = TextRecognizeManager()
        textRecognizer?.recognize(bitmap)
    }