我在我的应用中创建了两个用于照片上传的功能。第一个用于捕获图像，第二个用于从图库中选择图像。现在我有一个照片API作为URL。通过使用此API，我必须首先将图像上传到服务器，然后从服务器上传，它将通过应用程序提供。现在我可以在服务器上成功上传图片，在服务器端显示图片。但在app的imageview中没有显示该图像。每当我去另一个活动，然后回到图像活动时，imageview是空的。我使用共享首选项将图像保留在图像视图中，但这不起作用。
这是我的照片活动代码
public class ViewProfileFragment extends Fragment implements
View.OnClickListener{
private static final int CODE_GALLERY_REQUEST =999 ;
private static final int MY_CAMERA_REQUEST_CODE = 100;
private ImageView image;
private int REQUEST_CAMERA = 0, SELECT_FILE = 1;
private String userChoosenTask;
Bitmap bm;
private String UPLOAD_URL = Constants.HTTP.PHOTO_URL;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View rootView = inflater.inflate(R.layout.fragment_view_profile,
container, false);
.........
image=(ImageView)rootView.findViewById(R.id.profile_pic);
saveData();
return rootView;
}
public void saveData(){
Log.d( "----ViewProfile-Email", "mEmail" );
GlobalClass globalClass = new GlobalClass();
String mEmail = globalClass.getEmail_info();
Realm profileRealm;
profileRealm = Realm.getDefaultInstance();
RealmResults<MyColleagueModel> results =
profileRealm.where(MyColleagueModel.class).equalTo("mail",
mEmail).findAll();
//fetching the data
results.load();
if (results.size() > 0) {
......
SharedPreferences preferences =
PreferenceManager.getDefaultSharedPreferences(getActivity());
String mImageUri = preferences.getString("image", null);
if (mImageUri != null) {
image.setImageURI(Uri.parse(mImageUri));
} else {
Glide.with( this )
.load(Constants.HTTP.PHOTO_URL+mail)
.thumbnail(0.5f)
.override(200,200)
.diskCacheStrategy( DiskCacheStrategy.ALL)
.into( image);
}
}
}
@Override
public void onRequestPermissionsResult(int requestCode, String[]
permissions, int[] grantResults) {
if(requestCode==CODE_GALLERY_REQUEST){
if(grantResults.length>0 && grantResults[0]==
PackageManager.PERMISSION_GRANTED){
galleryIntent();
}
else {
Toast.makeText( getActivity().getApplicationContext(),"You
don't have permission to access gallery",Toast.LENGTH_LONG ).show();
}
return;
}
if(requestCode==MY_CAMERA_REQUEST_CODE){
if(grantResults.length>0 && grantResults[0]==
PackageManager.PERMISSION_GRANTED){
cameraIntent();
}
else {
Toast.makeText( getActivity().getApplicationContext(),"You
don't have permission to access gallery",Toast.LENGTH_LONG ).show();
}
return;
}
super.onRequestPermissionsResult( requestCode, permissions,grantResults );
}
public void showDialog(){
//Create a new builder and get the layout.
final AlertDialog.Builder builder = new
AlertDialog.Builder(this.getActivity());
.....
}
});
alertListView.setOnItemClickListener(new
AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
// ListViekw Clicked item index
if (position == 0) {
userChoosenTask ="Take Photo";
alert.dismiss();
if(isPermissionGrantedCamera()) {
cameraIntent();
}
}
else if (position == 1){
userChoosenTask ="Choose from Library";
alert.dismiss();
if(isPermissionGrantedGallery()) {
galleryIntent();
}
}
}
});
}
public boolean isPermissionGrantedGallery() {
if (Build.VERSION.SDK_INT >= 23) {
if
(getActivity().checkSelfPermission(android.Manifest.permission.READ_EXTERNAL_STORAGE)
== PackageManager.PERMISSION_GRANTED) {
Log.v("TAG","Permission is granted");
return true;
} else {
Log.v("TAG","Permission is revoked");
ActivityCompat.requestPermissions(this.getActivity(), new
String[]{Manifest.permission.READ_EXTERNAL_STORAGE}, 1);
return false;
}
}
else { //permission is automatically granted on sdk<23 upon
installation
Log.v("TAG","Permission is granted");
return true;
}
}
public boolean isPermissionGrantedCamera() {
if (Build.VERSION.SDK_INT >= 23) {
if
(getActivity().checkSelfPermission(android.Manifest.permission.CAMERA)
== PackageManager.PERMISSION_GRANTED) {
Log.v("TAG","Permission is granted");
return true;
} else {
Log.v("TAG","Permission is revoked");
ActivityCompat.requestPermissions(this.getActivity(), new
String[]{Manifest.permission.CAMERA}, 0);
return false;
}
}
else { //permission is automatically granted on sdk<23 upon
installation
Log.v("TAG","Permission is granted");
return true;
}
}
private void galleryIntent()
{
Intent intent = new Intent(Intent.ACTION_PICK);
intent.setType("image/*");
startActivityForResult(Intent.createChooser(intent, "Select
File"),SELECT_FILE);
}
public void cameraIntent() {
Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
if
(takePictureIntent.resolveActivity(getActivity().getPackageManager()) != null)
{
File cameraFolder;
if
(Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
cameraFolder = new
File(Environment.getExternalStorageDirectory(), "image/");
} else {
cameraFolder = getActivity().getCacheDir();
}
if (!cameraFolder.exists()) {
cameraFolder.mkdirs();
}
String imageFileName = System.currentTimeMillis() + ".jpg";File photoFile = new File(cameraFolder + imageFileName);
currentPhotoPath = photoFile.getAbsolutePath();
if (photoFile != null) {
takePictureIntent.putExtra(MediaStore.EXTRA_OUTPUT,
Uri.fromFile(photoFile));
startActivityForResult(takePictureIntent, REQUEST_CAMERA);
}
}
}
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data)
{
super.onActivityResult(requestCode, resultCode, data);
if (resultCode == RESULT_OK) {
if (requestCode == SELECT_FILE && data!=null){
onSelectFromGalleryResult(data);
}
else if (requestCode == REQUEST_CAMERA ) {
if(!TextUtils.isEmpty(currentPhotoPath)) {
try {
galleryAddPic();
onCaptureImageResult();
}
catch (Exception e){
}
}
}
}
}
private void galleryAddPic() {
Intent mediaScanIntent = new
Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE);
File f = new File(currentPhotoPath);
Uri contentUri = Uri.fromFile(f);
mediaScanIntent.setData(contentUri);
this.getActivity().sendBroadcast(mediaScanIntent);
}
private void onCaptureImageResult() {
Bitmap bitmap = getBitmapFromPath(currentPhotoPath, 200, 200);
image.setImageBitmap(bitmap);
compressBitMap(bitmap);
}
private void onSelectFromGalleryResult(Intent data) {
Uri uri = data.getData();
String[] projection = {MediaStore.Images.Media.DATA};
Cursor cursor = getContext().getContentResolver().query(uri,
projection, null, null, null);
if (cursor != null) {
int column_index =
cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
cursor.moveToFirst();
currentPhotoPath = cursor.getString(column_index);
cursor.close();
} else {
currentPhotoPath = uri.getPath();
}// Saves image URI as string to Default Shared Preferences
SharedPreferences preferences =
PreferenceManager.getDefaultSharedPreferences(getActivity());
SharedPreferences.Editor editor = preferences.edit();
editor.putString("image", String.valueOf(uri));
editor.commit();
try {
Bitmap bitmap = MediaStore.Images.Media.getBitmap(getActivity().getContentResolver(), uri);
image.setImageBitmap(bitmap);
} catch (IOException e) {
e.printStackTrace();
}
bm = BitmapFactory.decodeFile(currentPhotoPath);
compressBitMap(bm);
}
private void compressBitMap(Bitmap bitmap) {
ImageConversion imageConversion = new ImageConversion();
byte[] bytesArray;
int maxSize = 10 * 1024;
int imageMaxQuality = 50;
int imageMinQuality = 5;
bytesArray = imageConversion.convertBitmapToByteArray(bitmap,
imageMaxQuality, imageMinQuality, maxSize);
File destination = new
File(getContext().getApplicationContext().getFilesDir(),
System.currentTimeMillis() + ".jpg");
FileOutputStream fo;
try {
destination.createNewFile();
fo = new FileOutputStream(destination);
fo.write(bytesArray);
fo.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
currentPhotoPath = destination.getPath();
uploadImage(bytesArray);
}
private void uploadImage(final byte[] bytesArray){
.....
}
}
请不要使用
image.setImageURI(uri);
image.invalidate();
请使用以下代码而不是：
try {
Bitmap bitmap = MediaStore.Images.Media.getBitmap(getActivity().getContentResolver(), uri);
image.setImageBitmap(bitmap);
} catch (IOException e) {
e.printStackTrace();
}