大家好过去8天我一直在寻找这个错误的解决方案
让我先解释一下问题
我正在创建一个允许用户上传图片的应用程序
直到现在我正在测试我在Emulator上的所有代码，一切正常。
但是当我因为某些原因将其安装在手机上时，图片上传似乎无法正常工作
我正在使用的逻辑在以下代码中
public void loadImagefromGallery(View view) {
// Create intent to Open Image applications like Gallery, Google Photos
Intent galleryIntent = new Intent(Intent.ACTION_PICK,
android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
// Start the Intent
startActivityForResult(galleryIntent, RESULT_LOAD_IMG);
}
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
try {
// When an Image is picked
if (requestCode == RESULT_LOAD_IMG && resultCode == RESULT_OK
&& null != data) {
// Get the Image from data
Uri selectedImage = data.getData();
String[] filePathColumn = {MediaStore.Images.Media.DATA};
// Get the cursor
Cursor cursor = getContentResolver().query(selectedImage,
filePathColumn, null, null, null);
// Move to first row
cursor.moveToFirst();
int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
imgDecodableString = cursor.getString(columnIndex);
cursor.close();
String fileNameSegments[] = imgDecodableString.split("/");
fileName = fileNameSegments[fileNameSegments.length - 1];
// Put file name in Async Http Post Param which will used in Php web app
params.put("filename", fileName);
// Set the Image in ImageView after decoding the String
} else {
Toast.makeText(this, "You haven't picked Image",
Toast.LENGTH_LONG).show();
}
} catch (Exception e) {
Toast.makeText(this, "Something went wrong", Toast.LENGTH_LONG)
.show();
}
uploadImage();
}
public void uploadImage() {
// When Image is selected from Gallery
if (imgDecodableString != null && !imgDecodableString.isEmpty()) {
prgDialog = ProgressDialog.show(this, "", "Loading...");
// Convert image to String using Base64
encodeImagetoString();
// When Image is not selected from Gallery
} else {
Toast.makeText(
getApplicationContext(),
"You must select image from gallery before you try to upload",
Toast.LENGTH_LONG).show();
}
}
// AsyncTask - To convert Image to String
public void encodeImagetoString() {
new AsyncTask<Void, Void, String>() {
protected void onPreExecute() {
}
@Override
protected String doInBackground(Void... params) {
BitmapFactory.Options options = null;
options = new BitmapFactory.Options();
options.inSampleSize = 3;
bitmap = BitmapFactory.decodeFile(imgDecodableString,
options);
ByteArrayOutputStream stream = new ByteArrayOutputStream();
// Must compress the Image to reduce image size to make upload easy
bitmap.compress(Bitmap.CompressFormat.PNG, 50, stream);
byte[] byte_arr = stream.toByteArray();
// Encode Image to String
encodedString = Base64.encodeToString(byte_arr, 0);
return "";
}
@Override
protected void onPostExecute(String msg) {
// Put converted Image string into Async Http Post param
params.put("image", encodedString);
// Trigger Image upload
triggerImageUpload();
}
}.execute(null, null, null);
}
public void triggerImageUpload() {
makeHTTPCall();
}
// Make Http call to upload Image to Php server
public void makeHTTPCall() {
AsyncHttpClient client = new AsyncHttpClient();
// Don't forget to change the IP address to your LAN address. Port no as well.
client.post("http://example.com/upload_image.php",
params, new AsyncHttpResponseHandler() {
// When the response returned by REST has Http
// response code '200'
@Override
public void onSuccess(String response) {
// Hide Progress Dialog
prgDialog.dismiss();
String str= response.toString();
pp.setText(str);
Toast.makeText(getApplicationContext(), response,
Toast.LENGTH_LONG).show();
}
// When the response returned by REST has Http
// response code other than '200' such as '404',
// '500' or '403' etc
@Override
public void onFailure(int statusCode, Throwable error,
String content) {
// Hide Progress Dialog
// When Http response code is '404'
if (statusCode == 404) {
Toast.makeText(getApplicationContext(),
"Requested resource not found",
Toast.LENGTH_LONG).show();
}
// When Http response code is '500'
else if (statusCode == 500) {
Toast.makeText(getApplicationContext(),
"Something went wrong at server end",
Toast.LENGTH_LONG).show();
}
// When Http response code other than 404, 500
else {
Toast.makeText(
getApplicationContext(),
"Error Occured \n Most Common Error: \n1. Device not connected to Internet\n2. Web App is not deployed in App server\n3. App server is not running\n HTTP Status code : "
+ statusCode, Toast.LENGTH_LONG)
.show();
}
}
});
}
而且他们在LOGCAT中没有错误 如果你们能帮我解决这个问题，我将非常感激
并且您是否还可以指定应用程序在模拟器上正常运行而不在移动设备上正常运行的原因
更新
忘了添加我的PHP代码
<?php
// Get image string posted from Android App
$base=$_REQUEST['image'];
// Get file name posted from Android App
$filename = $_REQUEST['filename'];
$filename = time()."_".$filename;
// Decode Image
$binary=base64_decode($base);
header('Content-Type: bitmap; charset=utf-8');
// Images will be saved under 'www/imgupload/uplodedimages' folder
$file = fopen('uploads/'.$filename, 'wb');
// Create File
fwrite($file, $binary);
fclose($file);
function get_file_extension($file_name) {
return substr(strrchr($file_name,'.'),1);
}
echo 'my web address/uploads/'.$filename;
?>
答案 0 :(得分：0)
没关系，我找到了答案
我刚刚改变了这个
@Override
protected String doInBackground(Void... params) {
BitmapFactory.Options options = null;
options = new BitmapFactory.Options();
options.inSampleSize = 3;
bitmap = BitmapFactory.decodeFile(imgDecodableString,
options);
ByteArrayOutputStream stream = new ByteArrayOutputStream();
// Must compress the Image to reduce image size to make upload easy
bitmap.compress(Bitmap.CompressFormat.PNG, 50, stream);
byte[] byte_arr = stream.toByteArray();
// Encode Image to String
encodedString = Base64.encodeToString(byte_arr, 0);
return "";
}
到这个
public void encodeImagetoString() {
new AsyncTask<Void, Void, String>() {
protected void onPreExecute() {
};
@Override
protected String doInBackground(Void... params) {
BitmapFactory.Options options = null;
options = new BitmapFactory.Options();
options.inJustDecodeBounds = true;
options.inSampleSize = 3;
bitmap = BitmapFactory.decodeFile(imgPath,
options);
final int REQUIRED_SIZE = 1024;
int width_tmp = options.outWidth, height_tmp = options.outHeight;
int scale = 4;
while (true) {
if (width_tmp < REQUIRED_SIZE && height_tmp < REQUIRED_SIZE)
break;
width_tmp /= 2;
height_tmp /= 2;
scale *= 2;
}
BitmapFactory.Options o2 = new BitmapFactory.Options();
o2.inSampleSize = scale;
bitmap = BitmapFactory.decodeFile(imgPath, o2);
ByteArrayOutputStream stream = new ByteArrayOutputStream();
// Must compress the Image to reduce image size to make upload easy
bitmap.compress(Bitmap.CompressFormat.PNG, 50, stream);
byte[] byte_arr = stream.toByteArray();
// Encode Image to String
encodedString = Base64.encodeToString(byte_arr, 0);
return "";
}
但是我仍然无法弄清楚什么是错误的，为什么它会在模拟器上传，而不是在移动设备上如果有任何人有答案请告诉我