Question

我正在尝试查看图库中的图片，这是我的应用目前的样子

我可以选择图片，但无法在显示器上查看图片

这是我的 MainActivity.java

     public class HomeActivity extends AppCompatActivity implements NavigationView.OnNavigationItemSelectedListener {
 public static Context contextOfApplication;
     @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            contextOfApplication = getApplicationContext();
            setContentView(R.layout.activity_home);

    }

        @Override
    public void onActivityResult(int requestCode, int resultCode, Intent data) {
        // Override this method in the activity that hosts the Fragment and call super
        // in order to receive the result inside onActivityResult from the fragment.
    Fragment fragment = getSupportFragmentManager().findFragmentById(R.id.fragment_container);
    fragment.onActivityResult(requestCode, resultCode, data);
    super.onActivityResult(requestCode, resultCode, data);
}

public static Context getContextOfApplication()
{
    return contextOfApplication;
}
}

这是我的片段代码

imageupload.java

public class UploadDisplayPicFragment extends Fragment {
    Button btnChooseImage, btnUploadImage;
    ImageView imageUpload;
    final int CODE_GALLERY_REQUEST = 999;
    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {

        View fragment_view = inflater.inflate(R.layout.fragment_upload_display_pic, container, false);
        btnChooseImage = (Button)fragment_view.findViewById(R.id.btnChooseImage);
        btnUploadImage = (Button)fragment_view.findViewById(R.id.btnUploadImage);
        imageUpload = (ImageView) fragment_view.findViewById(R.id.imageView);

        btnChooseImage.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                //set permission to access gallary
                requestPermissions(new String[]{
                        Manifest.permission.READ_EXTERNAL_STORAGE},
                        CODE_GALLERY_REQUEST
                );
            }
        });



      return fragment_view;

    }

    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
//        Intent cameraIntent = new Intent(Intent.ACTION_PICK, MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
        if(requestCode == CODE_GALLERY_REQUEST)
        {
            if(grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED)
            {
                Intent gallaryIntent = new Intent(Intent.ACTION_PICK);
                gallaryIntent.setType("image/*");
                startActivityForResult(gallaryIntent.createChooser(gallaryIntent,"Select Image"),CODE_GALLERY_REQUEST);



            }else{
                Toast.makeText(getActivity(), "You do NOT have Permission", Toast.LENGTH_SHORT).show();
            }
            return ;
        }


        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
    }

    @Override
    public void onActivityResult(int requestCode, int resultCode, Intent data) {
        if(requestCode == CODE_GALLERY_REQUEST && requestCode == RESULT_OK && data != null)
        {
            Uri filepath = data.getData();
            Context applicationContext = HomeActivity.getContextOfApplication();

            try {
                InputStream inputStream = applicationContext.getContentResolver().openInputStream(filepath);
                Bitmap bitmap = BitmapFactory.decodeStream(inputStream);
                imageUpload.setImageBitmap(bitmap);
            } catch (FileNotFoundException e) {
                e.printStackTrace();
            }

        }
        super.onActivityResult(requestCode, resultCode, data);
    }
}

该应用程序不会崩溃或发生任何事情，但是当我选择图像时，它不会显示在框中

以防万一，您需要额外的注释：我正在关注本教程，但不同之处在于他们在活动中使用它，而我正在使用片段 https://www.youtube.com/watch?v=ULHyRwep3EU&t=1s

将图像上传到无法查看图像的片段

0 个答案: