我正在尝试为我的 Android 移动应用程序上传图像。对于从图库文件夹上传的图像，该代码运行良好。但是，如果我从“最近的图像”、“文档”、“下载”中选择任何图像，则图像路径不会被提取，无法上传图像。你能帮我解决这个问题吗？
这是我的编码供您参考：
package com.example.imageupload;
public class MainActivity extends Activity {
private ImageView image;
private Button uploadButton;
private Bitmap bitmap;
private Button selectImageButton, takeImageButton;
String link = uri;
// number of images to select
private static final int PICK_IMAGE = 1;
private static final int CAMERA_REQUEST = 1888;
/**
* called when the activity is first created
*/
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// find the views
image = (ImageView) findViewById(R.id.uploadImage);
uploadButton = (Button) findViewById(R.id.uploadButton);
takeImageButton = (Button) findViewById(R.id.takeImageButton);
selectImageButton = (Button) findViewById(R.id.selectImageButton);
selectImageButton.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
selectImageFromGallery();
}
});
// when uploadButton is clicked
uploadButton.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// new ImageUploadTask().execute();
Toast.makeText(MainActivity.this, "clicked", Toast.LENGTH_SHORT)
.show();
uploadTask();
}
});
}
protected void uploadTask() {
// TODO Auto-generated method stub
ByteArrayOutputStream bos = new ByteArrayOutputStream();
bitmap.compress(CompressFormat.JPEG, 100, bos);
byte[] data = bos.toByteArray();
String file = Base64.encodeToString(data, 0);
Log.i("base64 string", "base64 string: " + file);
new ImageUploadTask(file).execute();
}
/**
* Opens dialog picker, so the user can select image from the gallery. The
* result is returned in the method <code>onActivityResult()</code>
*/
public void selectImageFromGallery() {
Intent intent = new Intent();
intent.setType("image/*");
intent.setAction(Intent.ACTION_GET_CONTENT);
startActivityForResult(Intent.createChooser(intent, "Select Picture"),
PICK_IMAGE);
}
/**
* Retrives the result returned from selecting image, by invoking the method
* <code>selectImageFromGallery()</code>
*/
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == PICK_IMAGE && resultCode == RESULT_OK
&& null != data) {
Uri selectedImage = data.getData();
String[] filePathColumn = { MediaStore.Images.Media.DATA };
/*
* Cursor cursor = getContentResolver().query(selectedImage,
* filePathColumn, null, null, null);
*/
Cursor cursor = managedQuery(selectedImage, filePathColumn, null,
null, null);
cursor.moveToFirst();
// int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
int columnIndex = cursor
.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
cursor.moveToFirst();
String picturePath = cursor.getString(columnIndex);
Log.i("picturePath", "picturePath: " + picturePath);
cursor.close();
decodeFile(picturePath);
} }
public void decodeFile(String filePath) {
// Decode image size
BitmapFactory.Options o = new BitmapFactory.Options();
o.inJustDecodeBounds = true;
BitmapFactory.decodeFile(filePath, o);
// The new size we want to scale to
final int REQUIRED_SIZE = 1024;
// Find the correct scale value. It should be the power of 2.
int width_tmp = o.outWidth, height_tmp = o.outHeight;
int scale = 1;
while (true) {
if (width_tmp < REQUIRED_SIZE && height_tmp < REQUIRED_SIZE)
break;
width_tmp /= 2;
height_tmp /= 2;
scale *= 2;
}
// Decode with inSampleSize
BitmapFactory.Options o2 = new BitmapFactory.Options();
o2.inSampleSize = scale;
bitmap = BitmapFactory.decodeFile(filePath, o2);
image.setImageBitmap(bitmap);
}
/**
* The class connects with server and uploads the photo
*
*
*/
class ImageUploadTask extends AsyncTask<Void, Void, String> {
String base64_string;
public ImageUploadTask(String file) {
// TODO Auto-generated constructor stub
this.base64_string = file;
}
@Override
protected String doInBackground(Void... params) {
// TODO Auto-generated method stub
ArrayList<NameValuePair> postData;
postData = new ArrayList<NameValuePair>();
JSONObject parentData = new JSONObject();
JSONObject childData = new JSONObject();
try {
childData.put("fileContent", base64_string);
childData.put("fileName", "droid.jpeg");
childData.put("fileType", "I");
// System.out.println(childData);
parentData.put("mobile", childData);
System.out.println(parentData);
} catch (JSONException e) {
e.printStackTrace();
}
// postData.add(new BasicNameValuePair("User",
// childData.toString()));
InputStream is = null;
String jsonResponse = "";
JSONObject jObj = null;
try {
DefaultHttpClient httpClient = new DefaultHttpClient();
HttpPost request = new HttpPost(
"URL");
request.setHeader("Content-Type", "application/json");
request.setEntity(new StringEntity(parentData.toString()));
HttpResponse httpResponse = httpClient.execute(request);
System.out.println(httpResponse);
// HttpResponse httpResponse = httpClient.execute(httpPost);
HttpEntity httpEntity = httpResponse.getEntity();
System.out.println(httpEntity);
is = httpEntity.getContent();
System.out.println(is);
System.out.println(is.toString());
try {
Log.e("@@@@@@@@@@", "@@@@@@@@@@@");
BufferedReader reader = new BufferedReader(
new InputStreamReader(is, "iso-8859-1"), 8);
StringBuilder sb = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null) {
sb.append(line + "\n");
}
is.close();
jsonResponse = sb.toString();
Log.e("JSON", "Check Json: " + jsonResponse);
} catch (Exception e) {
Log.e("Buffer Error",
"Error converting result " + e.toString());
}
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
}
}
