如何保存新的imagebutton图片并在重新启动时加载新创建的imagebutton图片

Question

[应用程序关闭后，我试图在imagebutton中重新加载从图库或相机中获得的图像

我已经尝试将其保存到文件并从该文件加载，但无法使其正常工作。

public class HomeFragment extends Fragment {

String photoPath = Environment.getExternalStorageDirectory() + "/myImage.jpg";
    ImageButton profilePic;
Bitmap bitmap;

    public View onCreateView(@NonNull LayoutInflater inflater,
                             ViewGroup container, Bundle savedInstanceState) {

        View root = inflater.inflate(R.layout.fragment_home, container, false);

         profilePic = (ImageButton) root.findViewById(R.id.imageButton);


         bitmap = ((BitmapDrawable)profilePic.getDrawable()).getBitmap();


// set up listener on ImageButton to load method changeProfilePicture() when user clicks profilePic
        profilePic.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {

                changeProfilePicture();
            }
        });


loadImageFromStorage(photoPath);
        return root;

    }


    public void onResume() {

        super.onResume();

loadImageFromStorage(photoPath);
    }

    public void onStart() {

        super.onStart();


    }

    public void onPause() {

        super.onPause();


    }

    public void onStop() {

        super.onStop();
saveBitmap(bitmap);

    }

    public void onDestroy() {

        super.onDestroy();


    }

    static final int REQUEST_IMAGE_CAPTURE = 1;
    static final int REQUEST_GALLERY = 0;


    public void changeProfilePicture() {

// dialog asks user to choose how they want to change picture 
}

     // override onActivityResult to allow the imageButton to be changed to picture taken from camera or gallery

    public void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);

        if(resultCode == RESULT_OK) {

            switch (requestCode) {

                case REQUEST_GALLERY:
                    Uri galleryImage = data.getData();
                    try {
                        Bitmap bitmap = MediaStore.Images.Media.getBitmap(getActivity().getContentResolver(), galleryImage);
                        bitmap = Bitmap.createScaledBitmap(bitmap, 200, 200, false);
                        profilePic.setImageBitmap(bitmap);
                    } catch (IOException e) {
                        Log.i("TAG", "Exception " + e);
                    }

                    break;


                case REQUEST_IMAGE_CAPTURE:

                    Bundle extras = data.getExtras();
                    Bitmap imageBitmap = (Bitmap) extras.get("data");
                    imageBitmap = Bitmap.createScaledBitmap(imageBitmap, 200, 200, false);
                    profilePic.setImageBitmap(imageBitmap);
                    break;
            }

        }
    }

 private void saveBitmap(Bitmap bm){
        File file = Environment.getExternalStorageDirectory();
        File newFile = new File(file, "myImage.jpg");

        try {
            FileOutputStream fileOutputStream = new FileOutputStream(newFile);
            bm.compress(Bitmap.CompressFormat.JPEG, 100, fileOutputStream);
            fileOutputStream.flush();
            fileOutputStream.close();
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    private void loadImageFromStorage(String path)
    {

        try {
            File f=new File(path, "myImage.jpg");
            Bitmap b = BitmapFactory.decodeStream(new FileInputStream(f));
            profilePic.setImageBitmap(b);
        }
        catch (FileNotFoundException e)
        {
            e.printStackTrace();
        }

    }
}

我正在尝试从结果中保存新的ImageButton，并在重新启动应用程序时加载它。可以使用ImageButton完成吗？可以将其保存到文件并从中加载吗？

Answer 1

第一步，您需要像这样从imageButton获取位图