我正在创建一个捕获图像并上传到服务器的应用程序尝试上传之前的图片时上传

如何解决我正在创建一个捕获图像并上传到服务器的应用程序尝试上传之前的图片时上传

当我上传图像时，先前捕获的图像被上传，并且第一次上传android：src图像（默认图像）。在Imageview中，我获取了捕获的图像，但是当我上传之前的图像时，它会被上传。我认为位图正在与以前的图像位图合并。请帮助我找到问题。这是我的MainActivity.java

'''

package com.example.uploadpicture;

import android.Manifest;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.graphics.Bitmap;
import android.graphics.drawable.BitmapDrawable;
import android.net.Uri;
import android.os.Build;
import android.os.Bundle;
import android.provider.MediaStore;
import android.util.Base64;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.Toast;

import androidx.annotation.NonNull;
import androidx.annotation.RequiresApi;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.app.ActivityCompat;

import com.android.volley.AuthFailureError;
import com.android.volley.Request;
import com.android.volley.RequestQueue;
import com.android.volley.Response;
import com.android.volley.VolleyError;
import com.android.volley.toolBox.StringRequest;
import com.android.volley.toolBox.Volley;

import java.io.ByteArrayOutputStream;
import java.util.HashMap;
import java.util.Map;


public class MainActivity extends AppCompatActivity {
    Button ChooseBn,Uploadbn;
    ImageView imgView;
    final int CAMERA_REQUEST = 1888;
    private static final int MY_CAMERA_PERMISSION_CODE = 100;

    Bitmap bitmap;

    String urlUpload = "http://192.168.1.136/api_demo/upload.PHP";

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

        Uploadbn = (Button) findViewById(R.id.uploadbn);
        ChooseBn = (Button) findViewById(R.id.chooseBn);

        imgView = (ImageView) findViewById(R.id.ImageView);

        ChooseBn.setonClickListener(new View.OnClickListener() {
            @RequiresApi(api = Build.VERSION_CODES.M)
            @Override
            public void onClick(View v) {
                if (checkSelfPermission(Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED) {
                    requestPermissions(new String[]{Manifest.permission.CAMERA},MY_CAMERA_PERMISSION_CODE);
                } else {
                    Intent cameraIntent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
                    startActivityForResult(cameraIntent,CAMERA_REQUEST);
                }
                ActivityCompat.requestPermissions(
                        MainActivity.this,new String[]{Manifest.permission.CAMERA},CAMERA_REQUEST
                );
            }
        });

        Uploadbn.setonClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                ByteArrayOutputStream OutputStream = new ByteArrayOutputStream();
                bitmap.compress(Bitmap.CompressFormat.JPEG,100,OutputStream);
                byte[] imageBytes = OutputStream.toByteArray();
                final String imageString = Base64.encodetoString(imageBytes,Base64.DEFAULT);

                StringRequest stringRequest = new StringRequest(Request.Method.POST,urlUpload,new Response.Listener<String>() {
                    @Override
                    public void onResponse(String response) {

                        Toast.makeText(getApplicationContext(),response,Toast.LENGTH_LONG).show();


                    }
                },new Response.ErrorListener() {
                    @Override
                    public void onErrorResponse(VolleyError error) {
                        Toast.makeText(getApplicationContext(),"error: " + error.toString(),Toast.LENGTH_LONG).show();

                    }
                }) {
                    @Override
                    protected Map<String,String> getParams() throws AuthFailureError {
                        Map<String,String> params = new HashMap<>();
                        params.put("image",imageString);
                        return params;

                    }
                };
                RequestQueue requestQueue = Volley.newRequestQueue(MainActivity.this);
                requestQueue.add(stringRequest);
            }
        });
    }


    @Override
    public void onRequestPermissionsResult(int requestCode,@NonNull String[] permissions,@NonNull int[] grantResults) {

        if (requestCode == MY_CAMERA_PERMISSION_CODE) {
            if (grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                Intent intent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
                startActivityForResult(intent,CAMERA_REQUEST);
            } else {
                Toast.makeText(getApplicationContext(),"YOU DON'T HAVE PERMISSION",Toast.LENGTH_LONG).show();
            }
            return;

        }
        super.onRequestPermissionsResult(requestCode,permissions,grantResults);
    }



    @Override
    protected void onActivityResult(int requestCode,int resultCode,Intent data) {
        if (requestCode == CAMERA_REQUEST && resultCode == RESULT_OK) {
            Uri filePath = data.getData();

            try {
                //getting image from gallery
                bitmap = MediaStore.Images.Media.getBitmap(getContentResolver(),filePath);

                //Setting image to ImageView
                imgView.setimageBitmap(bitmap);
            } catch (Exception e) {
                e.printstacktrace();
            }

            bitmap = ((BitmapDrawable) imgView.getDrawable()).getBitmap();
            Bitmap bitmap = (Bitmap) data.getExtras().get("data");
            imgView.setimageBitmap(bitmap);
        }
        super.onActivityResult(requestCode,resultCode,data);

    }

}

这是我的PHP脚本

 <<?PHP
$target_dir= "upload/images";
$image = $_POST["image"];

if (!file_exists($target_dir)){
    mkdir($target_dir,0777,true);
 }
 
 $target_dir = $target_dir."/"."_1".".jpeg";
 if(file_put_contents($target_dir,base64_decode($image))) {
     
     echo json_encode([
     "Message" => "The file is uploaded","Status" => "OK"
     ]);
     
  } else {
     echo json_encode([
     "Message" => "error while uploading","Status" => "error"
     ]);
 }