我正在为我的应用程序上传图像，这里当我从我的图库中选择一个图像时工作正常，现在如果我从“最近”文件夹中选择相同的图像，图片路径为空，我无法上传图片你能帮我解决一下这个问题。
以下是我的代码供您参考：
@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();
}
});
takeImageButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Intent cameraIntent = new Intent(
android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
startActivityForResult(cameraIntent, CAMERA_REQUEST);
/*
* Picasso.with(MainActivity.this) .load(link) .into(image);
*/
}
});
// 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();
Log.i("selectedImage", "selectedImage: " + selectedImage.toString());
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);
}
以下是我的log供您参考：
答案 0 :(得分：0)
使用它在ImageView中显示图像
Uri selectedImage = data.getData();
imgView.setImageUri(selectedImage);
或者使用它..
Bitmap reducedSizeBitmap = getBitmap(selectedImage.getPath());
imgView.setImageBitmap(reducedSizeBitmap);
如果你想减小图像尺寸并且想要获得位图
private Bitmap getBitmap(String path) {
Uri uri = Uri.fromFile(new File(path));
InputStream in = null;
try {
final int IMAGE_MAX_SIZE = 1200000; // 1.2MP
in = getContentResolver().openInputStream(uri);
// Decode image size
BitmapFactory.Options o = new BitmapFactory.Options();
o.inJustDecodeBounds = true;
BitmapFactory.decodeStream(in, null, o);
in.close();
int scale = 1;
while ((o.outWidth * o.outHeight) * (1 / Math.pow(scale, 2)) >
IMAGE_MAX_SIZE) {
scale++;
}
Bitmap b = null;
in = getContentResolver().openInputStream(uri);
if (scale > 1) {
scale--;
// scale to max possible inSampleSize that still yields an image
// larger than target
o = new BitmapFactory.Options();
o.inSampleSize = scale;
b = BitmapFactory.decodeStream(in, null, o);
// resize to desired dimensions
int height = b.getHeight();
int width = b.getWidth();
double y = Math.sqrt(IMAGE_MAX_SIZE
/ (((double) width) / height));
double x = (y / height) * width;
Bitmap scaledBitmap = Bitmap.createScaledBitmap(b, (int) x,
(int) y, true);
b.recycle();
b = scaledBitmap;
System.gc();
} else {
b = BitmapFactory.decodeStream(in);
}
in.close();
Matrix matrix = new Matrix();
//set image rotation value to 90 degrees in matrix.
matrix.postRotate(90);
//supply the original width and height, if you don't want to change the height and width of bitmap.
b = Bitmap.createBitmap(b, 0, 0, b.getWidth(), b.getHeight(), matrix, true);
return b;
} catch (IOException e) {
Log.e("", e.getMessage(), e);
return null;
}
}
答案 1 :(得分：0)
我遇到了同样的问题。尽管还有其他使用URI的方法，但也有一种获取正确路径的方法。 看到这个问题： retrieve absolute path when select image from gallery kitkat android
有点过时了。这是更新的代码。
Uri originalUri = data.getData();
final int takeFlags = data.getFlags()
& (Intent.FLAG_GRANT_READ_URI_PERMISSION
| Intent.FLAG_GRANT_WRITE_URI_PERMISSION);
// Check for the freshest data.
getContentResolver().takePersistableUriPermission(originalUri, takeFlags);
/* now extract ID from Uri path using getLastPathSegment() and then split with ":"
then call get Uri to for Internal storage or External storage for media I have used getUri()
*/
String id = originalUri.getLastPathSegment().split(":")[1];
final String[] imageColumns = {MediaStore.Images.Media.DATA};
final String imageOrderBy = null;
Uri uri = getUri();
String filePath = "path";
Cursor imageCursor = getContentResolver().query(uri, imageColumns,
MediaStore.Images.Media._ID + "=" + id, null, imageOrderBy);
if(imageCursor.moveToFirst()) {
filePath = imageCursor.getString(imageCursor.getColumnIndex(MediaStore.Images.Media.DATA));
}
private Uri getUri() {
String state = Environment.getExternalStorageState();
if(!state.equalsIgnoreCase(Environment.MEDIA_MOUNTED))
return MediaStore.Images.Media.INTERNAL_CONTENT_URI;
return MediaStore.Images.Media.EXTERNAL_CONTENT_URI;
}
确保您具有读取的外部存储权限。另外，请注意，您的书写方式在kitkat之前有效。不幸的是，即使不再保证它可以工作，大多数示例似乎仍然使用该方法。
答案 2 :(得分：-1)
我遇到了同样的问题，并从这个github示例https://github.com/maayyaannkk/ImagePicker
中找到了解决方案这是解决您问题的方法
@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 imageEncoded = getRealPathFromURI(getActivity(), selectedImageUri);
Bitmap selectedImage = BitmapFactory.decodeFile(imageString);
image.setImageBitmap(selectedImage);
}
}
这些方法用于获取图片网址
public String getRealPathFromURI(Context context, Uri contentUri) {
OutputStream out;
File file = new File(getFilename(context));
try {
if (file.createNewFile()) {
InputStream iStream = context != null ? context.getContentResolver().openInputStream(contentUri) : context.getContentResolver().openInputStream(contentUri);
byte[] inputData = getBytes(iStream);
out = new FileOutputStream(file);
out.write(inputData);
out.close();
return file.getAbsolutePath();
}
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
private byte[] getBytes(InputStream inputStream) throws IOException {
ByteArrayOutputStream byteBuffer = new ByteArrayOutputStream();
int bufferSize = 1024;
byte[] buffer = new byte[bufferSize];
int len = 0;
while ((len = inputStream.read(buffer)) != -1) {
byteBuffer.write(buffer, 0, len);
}
return byteBuffer.toByteArray();
}
private String getFilename(Context context) {
File mediaStorageDir = new File(context.getExternalFilesDir(""), "patient_data");
// Create the storage directory if it does not exist
if (!mediaStorageDir.exists()) {
mediaStorageDir.mkdirs();
}
String mImageName = "IMG_" + String.valueOf(System.currentTimeMillis()) + ".png";
return mediaStorageDir.getAbsolutePath() + "/" + mImageName;
}