因此，我们正尝试在Android应用中实施上传图片功能。 在我们的注册页面中，有一个上传按钮，一旦按下，它应该重定向到图库，一旦选择了图像，它应该显示在放置的ImageView中。
以下是我们正在尝试处理的代码的摘录。 问题是，对于某些图像，它是正确显示的，但对于某些图像，它要么向右旋转90度，要么旋转180度。
可能是什么问题？
public class Register extends AppCompatActivity {
private String mName = "";
private String mUsername = "";
private String mPassword = "";
private String mCompany = "";
private String mContact = "";
private static final int PICK_IMAGE = 100;
ImageView imageView;
Uri imageUri;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_register);
Intent recvdIntent = getIntent();
mName = recvdIntent.getStringExtra("NAME");
mUsername = recvdIntent.getStringExtra("USERNAME");
mPassword = recvdIntent.getStringExtra("PASSWORD");
mCompany = recvdIntent.getStringExtra("COMPANY");
mContact = recvdIntent.getStringExtra("CONTACT");
imageView = (ImageView)findViewById(R.id.imageView);
Button btnSubmit = (Button) findViewById(R.id.btn_register);
btnSubmit.setOnClickListener(
new View.OnClickListener() {
@Override
public void onClick(View v) {
submitUserData();
Intent launchIntent = new Intent(Register.this, Category.class);
return;
}
}
);
Button upload = (Button) findViewById(R.id.btn_upload);
upload.setOnClickListener(
new View.OnClickListener() {
@Override
public void onClick(View v) {
openGallery();
}
});
return;
}
private void openGallery() {
Intent gallery = new Intent(Intent.ACTION_PICK, MediaStore.Images.Media.INTERNAL_CONTENT_URI);
startActivityForResult(gallery, PICK_IMAGE);
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (resultCode == RESULT_OK && requestCode == PICK_IMAGE) {
imageUri = data.getData();
imageView.setImageURI(imageUri);
}
}
public static Bitmap modifyOrientation(Bitmap bitmap, String image_absolute_path) throws IOException {
ExifInterface ei = new ExifInterface(image_absolute_path);
int orientation = ei.getAttributeInt(ExifInterface.TAG_ORIENTATION, ExifInterface.ORIENTATION_NORMAL);
switch (orientation) {
case ExifInterface.ORIENTATION_ROTATE_90:
return rotate(bitmap, 90);
case ExifInterface.ORIENTATION_ROTATE_180:
return rotate(bitmap, 180);
case ExifInterface.ORIENTATION_ROTATE_270:
return rotate(bitmap, 270);
case ExifInterface.ORIENTATION_FLIP_HORIZONTAL:
return flip(bitmap, true, false);
case ExifInterface.ORIENTATION_FLIP_VERTICAL:
return flip(bitmap, false, true);
default:
return bitmap;
}
}
public static Bitmap rotate(Bitmap bitmap, float degrees) {
Matrix matrix = new Matrix();
matrix.postRotate(degrees);
return Bitmap.createBitmap(bitmap, 0, 0, bitmap.getWidth(), bitmap.getHeight(), matrix, true);
}
public static Bitmap flip(Bitmap bitmap, boolean horizontal, boolean vertical) {
Matrix matrix = new Matrix();
matrix.preScale(horizontal ? -1 : 1, vertical ? -1 : 1);
return Bitmap.createBitmap(bitmap, 0, 0, bitmap.getWidth(), bitmap.getHeight(), matrix, true);
}
private void submitUserData() {
EditText edtName = (EditText) findViewById(R.id.edt_name);
EditText edtCompany = (EditText) findViewById(R.id.edt_company);
EditText edtContact = (EditText) findViewById(R.id.edt_contact);
EditText edtUsername = (EditText) findViewById(R.id.edt_username);
EditText edtPassword = (EditText) findViewById(R.id.edt_password);
TaraApp2 app = (TaraApp2) getApplication();
app.saveUserData(edtName.getText().toString(),edtUsername.getText().toString(),
edtPassword.getText().toString(),
edtCompany.getText().toString(),
edtContact.getText().toString() );
finish();
return;
}
}
答案 0 :(得分：0)
Uri selectedImageUri = data.getData();
Bitmap bitmap = scaleImage(this,selectedImageUri);
public static Bitmap scaleImage(Context context, Uri photoUri) throws IOException {
InputStream is = context.getContentResolver().openInputStream(photoUri);
BitmapFactory.Options dbo = new BitmapFactory.Options();
dbo.inJustDecodeBounds = true;
BitmapFactory.decodeStream(is, null, dbo);
is.close();
int rotatedWidth, rotatedHeight;
int orientation = getOrientation(context, photoUri);
if (orientation == 90 || orientation == 270) {
rotatedWidth = dbo.outHeight;
rotatedHeight = dbo.outWidth;
} else {
rotatedWidth = dbo.outWidth;
rotatedHeight = dbo.outHeight;
}
Bitmap srcBitmap;
is = context.getContentResolver().openInputStream(photoUri);
if (rotatedWidth > MAX_IMAGE_DIMENSION || rotatedHeight > MAX_IMAGE_DIMENSION) {
float widthRatio = ((float) rotatedWidth) / ((float) MAX_IMAGE_DIMENSION);
float heightRatio = ((float) rotatedHeight) / ((float) MAX_IMAGE_DIMENSION);
float maxRatio = Math.max(widthRatio, heightRatio);
// Create the bitmap from file
BitmapFactory.Options options = new BitmapFactory.Options();
options.inSampleSize = (int) maxRatio;
srcBitmap = BitmapFactory.decodeStream(is, null, options);
} else {
srcBitmap = BitmapFactory.decodeStream(is);
}
is.close();
/*
* if the orientation is not 0 (or -1, which means we don't know), we
* have to do a rotation.
*/
if (orientation > 0) {
Matrix matrix = new Matrix();
matrix.postRotate(orientation);
srcBitmap = Bitmap.createBitmap(srcBitmap, 0, 0, srcBitmap.getWidth(),
srcBitmap.getHeight(), matrix, true);
}
String type = context.getContentResolver().getType(photoUri);
ByteArrayOutputStream baos = new ByteArrayOutputStream();
if (type.equals("image/png")) {
srcBitmap.compress(Bitmap.CompressFormat.PNG, 100, baos);
} else if (type.equals("image/jpg") || type.equals("image/jpeg")) {
srcBitmap.compress(Bitmap.CompressFormat.JPEG, 100, baos);
}
byte[] bMapArray = baos.toByteArray();
baos.close();
return BitmapFactory.decodeByteArray(bMapArray, 0, bMapArray.length);
}
public static int getOrientation(Context context, Uri photoUri) {
/* it's on the external media. */
Cursor cursor = context.getContentResolver().query(photoUri,
new String[] { MediaStore.Images.ImageColumns.ORIENTATION }, null, null, null);
if (cursor.getCount() != 1) {
return -1;
}
cursor.moveToFirst();
return cursor.getInt(0);
}
获取图像的网址使用此
public static Uri getImageContentUri(Context context, File imageFile) {
String filePath = imageFile.getAbsolutePath();
Cursor cursor = context.getContentResolver().query(
MediaStore.Images.Media.EXTERNAL_CONTENT_URI,
new String[] { MediaStore.Images.Media._ID },
MediaStore.Images.Media.DATA + "=? ",
new String[] { filePath }, null);
if (cursor != null && cursor.moveToFirst()) {
int id = cursor.getInt(cursor
.getColumnIndex(MediaStore.MediaColumns._ID));
Uri baseUri = Uri.parse("content://media/external/images/media");
return Uri.withAppendedPath(baseUri, "" + id);
} else {
if (imageFile.exists()) {
ContentValues values = new ContentValues();
values.put(MediaStore.Images.Media.DATA, filePath);
return context.getContentResolver().insert(
MediaStore.Images.Media.EXTERNAL_CONTENT_URI, values);
} else {
return null;
}
}
}
答案 1 :(得分：0)
For accessing picture from your gallery you can use the croperino library.
https://android-arsenal.com/details/1/4374
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Croperino.prepareGallery(MainActivity.this);
}
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data)
{
super.onActivityResult(requestCode, resultCode, data);
switch (requestCode) {
case CroperinoConfig.REQUEST_PICK_FILE:
if (resultCode == Activity.RESULT_OK) {
CroperinoFileUtil.newGalleryFile(data, MainActivity.this);
Croperino.runCropImage(CroperinoFileUtil.getmFileTemp(),
MainActivity.this, true, 1, 1, 0, 0);
}
break;
case CroperinoConfig.REQUEST_CROP_PHOTO:
if (resultCode == Activity.RESULT_OK) {
Uri i = Uri.fromFile(CroperinoFileUtil.getmFileTemp());
ivMain.setImageURI(i);
//Do saving / uploading of photo method here.
//The image file can always be retrieved via
CroperinoFileUtil.getmFileTemp()
}
break;
default:
break;
}
}