使用 Android 将图像发送到 MySQL 数据库

Question

我有当前的应用程序，它从 MySQL 数据库发送和检索数据，但到目前为止我传输的信息是字符串。如何更新下面的代码才能发送图片。

public class NewProductActivity extends Activity {

// Progress Dialog
private ProgressDialog pDialog;

JSONParser jsonParser = new JSONParser();
EditText inputName;
EditText inputPrice;
EditText inputDesc;
EditText inputImg;
Button btnTakePhoto;
ImageView imgTakenPhoto;
private static final int CAM_REQUREST = 1313;
// url to create new product
private static String url_create_product = "http://buiud.com/android_connect/create_product.php";

// JSON Node names
private static final String TAG_SUCCESS = "success";

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.add_product);

    // Edit Text
    inputName = (EditText) findViewById(R.id.inputName);
    inputPrice = (EditText) findViewById(R.id.inputPrice);
    inputDesc = (EditText) findViewById(R.id.inputDesc);
    inputImg = (EditText) findViewById(R.id.imageView1);
    // Create button
    Button btnCreateProduct = (Button) findViewById(R.id.btnCreateProduct);

    // button click event
    btnCreateProduct.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View view) {
            // creating new product in background thread
            new CreateNewProduct().execute();
        }
    });
    btnTakePhoto = (Button) findViewById(R.id.button1);
    imgTakenPhoto = (ImageView) findViewById(R.id.imageView1);

    btnTakePhoto.setOnClickListener(new btnTakePhotoClicker());

}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    // TODO Auto-generated method stub
    super.onActivityResult(requestCode, resultCode, data);

      if (requestCode == CAM_REQUREST) {
          Bitmap thumbnail = (Bitmap) data.getExtras().get("data");
          imgTakenPhoto.setImageBitmap(thumbnail);
      }
}

class btnTakePhotoClicker implements Button.OnClickListener
{
    @Override
    public void onClick(View v) {
        // TODO Auto-generated method stub

        Intent cameraIntent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
        startActivityForResult(cameraIntent, CAM_REQUREST);
    }
}
/**
 * Background Async Task to Create new product
 * */
class CreateNewProduct extends AsyncTask<String, String, String> {

    /**
     * Before starting background thread Show Progress Dialog
     * */
    @Override
    protected void onPreExecute() {
        super.onPreExecute();
        pDialog = new ProgressDialog(NewProductActivity.this);
        pDialog.setMessage("Creating Product..");
        pDialog.setIndeterminate(false);
        pDialog.setCancelable(true);
        pDialog.show();
    }

    /**
     * Creating product
     * */
    protected String doInBackground(String... args) {
        String name = inputName.getText().toString();
        String price = inputPrice.getText().toString();
        String description = inputDesc.getText().toString();
        String image = inputImg.getText().toString();

        // Building Parameters
        List<NameValuePair> params = new ArrayList<NameValuePair>();
        params.add(new BasicNameValuePair("name", name));
        params.add(new BasicNameValuePair("price", price));
        params.add(new BasicNameValuePair("description", description));
        params.add(new BasicNameValuePair("image", image));

        // getting JSON Object
        // Note that create product url accepts POST method
        JSONObject json = jsonParser.makeHttpRequest(url_create_product,
                "POST", params);

        // check log cat fro response
        Log.d("Create Response", json.toString());

        // check for success tag
        try {
            int success = json.getInt(TAG_SUCCESS);

            if (success == 1) {
                // successfully created product
                Intent i = new Intent(getApplicationContext(), AllProductsActivity.class);
                startActivity(i);

                // closing this screen
                finish();
            } else {
                // failed to create product
            }
        } catch (JSONException e) {
            e.printStackTrace();
        }

        return null;
    }

    /**
     * After completing background task Dismiss the progress dialog
     * **/
    protected void onPostExecute(String file_url) {
        // dismiss the dialog once done
        pDialog.dismiss();
    }

}
}

注意：我已经像添加其他字符串字段一样添加了图像字段，但是应用程序现在停止了，它显然无法将图片转换为文本。让我知道你的想法，或任何可用的选角。我只是拍了一张照片，这张照片将被发送到 MySQL。

Answer 1

如果你想在服务器上发送图像！您必须在Base 64 字符串中更改它。

为了将它保存在数据库中！您必须将其转换为Blob 类型！

试试这个代码：

        Bitmap bitmap = BitmapFactory.decodeResource(getResources(),R.drawable.ic_launcher);          
        ByteArrayOutputStream stream = new ByteArrayOutputStream();
        bitmap.compress(Bitmap.CompressFormat.PNG, 90, stream); //compress to which format you want.
        byte [] byte_arr = stream.toByteArray();
        String image_str = Base64.encodeToString(byte_arr, Base64.DEFAULT);

并将其作为参数传递，就像您在请求中添加其他参数一样！

params.add(new BasicNameValuePair("image",image_str));

我希望这会有所帮助！有关详细信息，请参阅此link。