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上传图片到android服务器
EN

Stack Overflow用户
提问于 2013-12-02 15:00:26
回答 5查看 209.7K关注 0票数 95

我想知道在不降低图像质量的情况下将图像上传到服务器的最好方法。我在谷歌上搜索过,发现了各种发布数据的方法。但我不确定哪一个是最好的上传。我偶然遇到了

  1. 分块图片上传。使用字节array
  2. Uploading图像使用base64编码字符串的
  3. 上传图像。

我尝试过Base64编码,如果图像分辨率太高,它会导致OOM(内存不足)。任何解决这个问题的教程都将不胜感激。提前谢谢。

EN

回答 5

Stack Overflow用户

发布于 2013-12-02 15:22:01

代码语言:javascript
复制
Intent photoPickerIntent = new Intent(Intent.ACTION_PICK);
photoPickerIntent.setType("image/*");
startActivityForResult(photoPickerIntent, 1);

用于从图库中选择图像的以上代码的

代码语言:javascript
复制
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    if (requestCode == 1)
        if (resultCode == Activity.RESULT_OK) {
            Uri selectedImage = data.getData();

            String filePath = getPath(selectedImage);
            String file_extn = filePath.substring(filePath.lastIndexOf(".") + 1);
            image_name_tv.setText(filePath);

            try {
                if (file_extn.equals("img") || file_extn.equals("jpg") || file_extn.equals("jpeg") || file_extn.equals("gif") || file_extn.equals("png")) {
                    //FINE
                } else {
                    //NOT IN REQUIRED FORMAT
                }
            } catch (FileNotFoundException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
}

public String getPath(Uri uri) {
    String[] projection = {MediaColumns.DATA};
    Cursor cursor = managedQuery(uri, projection, null, null, null);
    column_index = cursor
            .getColumnIndexOrThrow(MediaColumns.DATA);
    cursor.moveToFirst();
    imagePath = cursor.getString(column_index);

    return cursor.getString(column_index);
}

现在使用MULTIPART FORM DATA发布数据

代码语言:javascript
复制
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost("LINK TO SERVER");

多部分表单数据

代码语言:javascript
复制
MultipartEntity mpEntity = new MultipartEntity(HttpMultipartMode.BROWSER_COMPATIBLE);
if (filePath != null) {
    File file = new File(filePath);
    Log.d("EDIT USER PROFILE", "UPLOAD: file length = " + file.length());
    Log.d("EDIT USER PROFILE", "UPLOAD: file exist = " + file.exists());
    mpEntity.addPart("avatar", new FileBody(file, "application/octet"));
}

最终将数据发布到服务器

代码语言:javascript
复制
httppost.setEntity(mpEntity);
HttpResponse response = httpclient.execute(httppost);
票数 88
EN

Stack Overflow用户

发布于 2015-05-09 18:38:22

选择并上传的主要活动类

代码语言:javascript
复制
import android.app.Activity;
import android.app.ProgressDialog;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.database.Cursor;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.net.Uri;
import android.os.AsyncTask;
import android.os.Bundle;
import android.provider.MediaStore;
//import android.util.Base64;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.Toast;

import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.util.EntityUtils;

import java.io.ByteArrayOutputStream;
import java.util.ArrayList;


public class MainActivity extends Activity {

    Button btpic, btnup;
    private Uri fileUri;
    String picturePath;
    Uri selectedImage;
    Bitmap photo;
    String ba1;
    public static String URL = "Paste your URL here";
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        btpic = (Button) findViewById(R.id.cpic);
        btpic.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                clickpic();
            }
        });

        btnup = (Button) findViewById(R.id.up);
        btnup.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                upload();
            }
        });
    }

    private void upload() {
        // Image location URL
        Log.e("path", "----------------" + picturePath);

        // Image
        Bitmap bm = BitmapFactory.decodeFile(picturePath);
        ByteArrayOutputStream bao = new ByteArrayOutputStream();
        bm.compress(Bitmap.CompressFormat.JPEG, 90, bao);
        byte[] ba = bao.toByteArray();
       //ba1 = Base64.encodeBytes(ba);

        Log.e("base64", "-----" + ba1);

        // Upload image to server
        new uploadToServer().execute();

    }

    private void clickpic() {
        // Check Camera
        if (getApplicationContext().getPackageManager().hasSystemFeature(
                PackageManager.FEATURE_CAMERA)) {
            // Open default camera
            Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
            intent.putExtra(MediaStore.EXTRA_OUTPUT, fileUri);

            // start the image capture Intent
            startActivityForResult(intent, 100);

        } else {
            Toast.makeText(getApplication(), "Camera not supported", Toast.LENGTH_LONG).show();
        }
    }

    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        if (requestCode == 100 && resultCode == RESULT_OK) {

            selectedImage = data.getData();
            photo = (Bitmap) data.getExtras().get("data");

            // Cursor to get image uri to display

            String[] filePathColumn = {MediaStore.Images.Media.DATA};
            Cursor cursor = getContentResolver().query(selectedImage,
                    filePathColumn, null, null, null);
            cursor.moveToFirst();

            int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
            picturePath = cursor.getString(columnIndex);
            cursor.close();

            Bitmap photo = (Bitmap) data.getExtras().get("data");
            ImageView imageView = (ImageView) findViewById(R.id.Imageprev);
            imageView.setImageBitmap(photo);
        }
    }

    public class uploadToServer extends AsyncTask<Void, Void, String> {

        private ProgressDialog pd = new ProgressDialog(MainActivity.this);
        protected void onPreExecute() {
            super.onPreExecute();
            pd.setMessage("Wait image uploading!");
            pd.show();
        }

        @Override
        protected String doInBackground(Void... params) {

            ArrayList<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>();
            nameValuePairs.add(new BasicNameValuePair("base64", ba1));
            nameValuePairs.add(new BasicNameValuePair("ImageName", System.currentTimeMillis() + ".jpg"));
            try {
                HttpClient httpclient = new DefaultHttpClient();
                HttpPost httppost = new HttpPost(URL);
                httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
                HttpResponse response = httpclient.execute(httppost);
                String st = EntityUtils.toString(response.getEntity());
                Log.v("log_tag", "In the try Loop" + st);

            } catch (Exception e) {
                Log.v("log_tag", "Error in http connection " + e.toString());
            }
            return "Success";

        }

        protected void onPostExecute(String result) {
            super.onPostExecute(result);
            pd.hide();
            pd.dismiss();
        }
    }
}

处理上传图像和从base64编码数据创建图像的php代码

代码语言:javascript
复制
<?php
error_reporting(E_ALL);
if(isset($_POST['ImageName'])){
$imgname = $_POST['ImageName'];
$imsrc = base64_decode($_POST['base64']);
$fp = fopen($imgname, 'w');
fwrite($fp, $imsrc);
if(fclose($fp)){
 echo "Image uploaded";
}else{
 echo "Error uploading image";
}
}
?>
票数 18
EN

Stack Overflow用户

发布于 2013-12-02 15:09:53

使用下面的代码,它可以帮助你....

代码语言:javascript
复制
        BitmapFactory.Options options = new BitmapFactory.Options();

        options.inSampleSize = 4;
        options.inPurgeable = true;
        Bitmap bm = BitmapFactory.decodeFile("your path of image",options);

        ByteArrayOutputStream baos = new ByteArrayOutputStream();

        bm.compress(Bitmap.CompressFormat.JPEG,40,baos); 


        // bitmap object

        byteImage_photo = baos.toByteArray();

                    //generate base64 string of image

                   String encodedImage =Base64.encodeToString(byteImage_photo,Base64.DEFAULT);

  //send this encoded string to server
票数 9
EN
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接:

https://stackoverflow.com/questions/20322528

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