将图片从Android应用上传到服务器

Question

我正在尝试将一些图片上传到服务器但它无法正常工作...我找不到错误，实际上我的代码不会将图片发送到我的服务器。在模拟器上，我实现了显示我选择的图片，而在我选择图片时我的手机上的应用程序崩溃了。

这是我的代码：

package abc.abc

import android.app.ProgressDialog;
import android.content.Intent;
import android.graphics.Bitmap;
import android.net.Uri;
import android.provider.MediaStore;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Base64;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.Toast;

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.io.IOException;
import java.util.Hashtable;
import java.util.Map;

public class MainActivity extends AppCompatActivity implements View.OnClickListener  {

    private Button buttonChoose;
    private Button buttonUpload;

    private ImageView imageView;

    private EditText editTextName;

    private Bitmap bitmap;

    private int PICK_IMAGE_REQUEST = 1;

    private String UPLOAD_URL ="http://localhost/upload.php";

    private String KEY_IMAGE = "image";
    private String KEY_NAME = "name";

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

        buttonChoose = (Button) findViewById(R.id.buttonChoose);
        buttonUpload = (Button) findViewById(R.id.buttonUpload);

        editTextName = (EditText) findViewById(R.id.editText);

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

        buttonChoose.setOnClickListener(this);
        buttonUpload.setOnClickListener(this);
    }

    public String getStringImage(Bitmap bmp){
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        bmp.compress(Bitmap.CompressFormat.JPEG, 100, baos);
        byte[] imageBytes = baos.toByteArray();
        String encodedImage = Base64.encodeToString(imageBytes, Base64.DEFAULT);
        return encodedImage;
    }

    private void uploadImage(){
        //Showing the progress dialog
        final ProgressDialog loading = ProgressDialog.show(this,"Uploading...","Please wait...",false,false);
        StringRequest stringRequest = new StringRequest(Request.Method.POST, UPLOAD_URL,
                new Response.Listener<String>() {
                    @Override
                    public void onResponse(String s) {
                        //Disimissing the progress dialog
                        loading.dismiss();
                        //Showing toast message of the response
                        Toast.makeText(MainActivity.this, s , Toast.LENGTH_LONG).show();
                    }
                },
                new Response.ErrorListener() {
                    @Override
                    public void onErrorResponse(VolleyError volleyError) {
                        //Dismissing the progress dialog
                        loading.dismiss();

                        //Showing toast
                        Toast.makeText(MainActivity.this, volleyError.getMessage().toString(), Toast.LENGTH_LONG).show();
                    }
                }){
            @Override
            protected Map<String, String> getParams() throws AuthFailureError {
                //Converting Bitmap to String
                String image = getStringImage(bitmap);

                //Getting Image Name
                String name = editTextName.getText().toString().trim();

                //Creating parameters
                Map<String,String> params = new Hashtable<String, String>();

                //Adding parameters
                params.put(KEY_IMAGE, image);
                params.put(KEY_NAME, name);

                //returning parameters
                return params;
            }
        };

        //Creating a Request Queue
        RequestQueue requestQueue = Volley.newRequestQueue(this);

        //Adding request to the queue
        requestQueue.add(stringRequest);
    }

    private void showFileChooser() {
        Intent intent = new Intent();
        intent.setType("image/*");
        intent.setAction(Intent.ACTION_GET_CONTENT);
        startActivityForResult(Intent.createChooser(intent, "Select Picture"), PICK_IMAGE_REQUEST);
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);

        if (requestCode == PICK_IMAGE_REQUEST && resultCode == RESULT_OK && data != null && data.getData() != null) {
            Uri filePath = data.getData();
            try {
                //Getting the Bitmap from Gallery
                bitmap = MediaStore.Images.Media.getBitmap(getContentResolver(), filePath);
                //Setting the Bitmap to ImageView
                imageView.setImageBitmap(bitmap);
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

    @Override
    public void onClick(View v) {

        if(v == buttonChoose){
            showFileChooser();
        }

        if(v == buttonUpload){
            uploadImage();
        }
    }
}

这是我的php文件：

<?php

 if($_SERVER['REQUEST_METHOD']=='POST'){

 $image = $_POST['image'];
                $name = $_POST['name'];

 require_once('dbConnect.php'); // To connect to the database

 $sql ="SELECT id FROM table ORDER BY id ASC";

 $res = mysqli_query($con,$sql);

 $id = 0;

 while($row = mysqli_fetch_array($res)){
 $id = $row['id'];
 }

 $path = "$id.png";

 $actualpath = "http://localhost/$path";

 $sql = "INSERT INTO table (photo,name) VALUES ('$actualpath','$name')";

 if(mysqli_query($con,$sql)){
 file_put_contents($path,base64_decode($image));
 echo "Successfully Uploaded";
 }

 mysqli_close($con);
 }else{
 echo "Error";
 }

?>

非常感谢你帮助我，因为我在这段代码上待了两个星期...我真的不明白为什么它不起作用！