java – 如何使用Android Studio在Amazon Rekognition AWS中检测面部？

2023年5月11日 282次阅读

我已经尝试了很多方法,但我不能成功.我没有找到
Android的任何源代码示例(关于重新认知)

在开发者指南中有JAVA中的源代码,但即使我尝试过TT,也无法实现

我尝试通过从外部存储器(从模拟器)发送图像文件来检测面部
我不知道我做错了什么(我不擅长编码)
这是我的代码

AmazonRekognitionClient amazonRekognitionClient;
Image getAmazonRekognitionImage;
DetectFacesRequest detectFaceRequest;
DetectFacesResult detectFaceResult;
File file = new File(Environment.getExternalStorageDirectory(),"sungyeol.jpg.jpg");

public void test_00(View view) {
 ByteBuffer imageBytes;
 try{
        InputStream inputStream = new FileInputStream(file.getAbsolutePath().toString());
        imageBytes = ByteBuffer.wrap(IOUtils.toByteArray(inputStream));
        Log.e("InputStream: ",""+inputStream);
        Log.e("imageBytes: ","");
        getAmazonRekognitionImage.withBytes(imageBytes);

        // Initialize the Amazon Cognito credentials provider
        CognitoCachingCredentialsProvider credentialsProvider = new CognitoCachingCredentialsProvider(
                getApplicationContext(),
                "us-east-2:.......", // Identity Pool ID
                Regions.US_EAST_2 // Region
        );

        //I want "ALL" attributes
        amazonRekognitionClient = new AmazonRekognitionClient(credentialsProvider);

        detectFaceRequest = new DetectFacesRequest()
                .withAttributes(Attribute.ALL.toString())
                .withImage(getAmazonRekognitionImage);

        detectFaceResult = amazonRekognitionClient.detectFaces(detectFaceRequest);
        detectFaceResult.getFaceDetails();

    }
 catch(Exception ex){
   Log.e("Error on something:","Message:"+ex.getMessage());
 }

这是我的错误

02-04 09:30:07.268 29405-29405/? E/InputStream:: java.io.FileInputStream@a9b23e7
02-04 09:30:07.271 29405-29405/? E/Error on something:: Message:Attempt to invoke virtual method 'com.amazonaws.services.rekognition.model.Image com.amazonaws.services.rekognition.model.Image.withBytes(java.nio.ByteBuffer)' on a null object reference

什么是空对象引用？
我尝试更改文件路径,但他说没有这样的文件……当我改为这条路径时,上面有错误.
顺便说一下,我已经要求用户获得从Android中的Emulator访问文件夹的权限

请帮我
PS.对不起,我的英语不好

先感谢您.

最佳答案 现在我对这些问题感到满意.我经历了许多事情< 3< 3< 3.

谢谢

我是泰国人,我不得不更加努力地找到解决方案,因为特定语言缺乏信息.这是我的解决方案.

我的解决方案是：

0.有一个设置Rekognition的端点 – >
http://docs.aws.amazon.com/general/latest/gr/rande.html#rekognition_region

1.在“空对象引用问题”中,我发现我必须首先创建一个新对象,例如“Image image = new Image();” < – “new”命令在该类中创建一个对象实例 2.上述错误后,有更多错误(NetworkOnMainThreadException错误),所以我尝试了所有内容,直到找到此页面 – >
https://docs.aws.amazon.com/cognito/latest/developerguide/getting-credentials.html页面说…

《java – 如何使用Android Studio在Amazon Rekognition AWS中检测面部？》

因此,我查找了有关AsyncTask的更多信息,之后我创建了一个AsyncTask类,然后将所有关于初始化,请求和响应的代码移到AsyncTask类. ตอนรันตอนท้ายๆน้ำตาจิไหล我的代码工作… TT和结论sungyeol.jpg.jpg文件工作

例如

private void testTask(){
  .... all code in the main thread particularly on the requests and responses
  from the services
 //print the response or the result
 //Log.e() makes the message in the android monitor red like an error
 Log.e("Response:", [responseparameter.toString()]);

}

//create the inherited class from the AsyncTask Class
//(you can create within your activity class)
class AsyncTaskRunner extends AsyncTask<String,String,String>{
    @Override 
    public String doInBackground(String ... input){
        testTask(); // call the testTask() method that i have created
        return null; // this override method must return String
    }

} 

//I've created a button for running the task
public void buttonTask(View view){
    AsyncTaskRunner runner = new AsyncTaskRunner();
    runner.execute();

}

有关AsyncTask的更多信息：

https://developer.android.com/training/basics/network-ops/connecting.html#AsyncTask

http://www.compiletimeerror.com/2013/01/why-and-how-to-use-asynctask.html#.WJdkqVOLTIU

我希望这些帮助:)

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