Java 在Android中更新ImageView

我有一个主要活动，上面只有一些片段

我正在尝试使用Gallery更改片段中的ImageView。但一旦选择了映像，MainActivity就会得到刷新，从而将MainActivity更改回默认片段

获得许可

 textViewChangeImage.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Log.d(TAG,"Select Image executed");

            requestPermissions(
                    new String[]{Manifest.permission.READ_EXTERNAL_STORAGE},
                    REQUEST_CODE);



        }
    });

 @Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
    Log.d(TAG,"Select Image Permission executed");

    if(requestCode == REQUEST_CODE){
        progressDialogUploadDp.setMessage("Uploading...");
       progressDialogUploadDp.show();

        if(grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED){
            Intent intent = new Intent(Intent.ACTION_PICK);
            intent.setType("image/*");
            intent.putExtra("imageUpdate","true");
            startActivityForResult(intent,REQUEST_CODE);
        }else{
            Toast.makeText(getActivity(), "No Permission Granted", Toast.LENGTH_SHORT).show();
        }
        return;
    }

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

应请求许可

 textViewChangeImage.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Log.d(TAG,"Select Image executed");

            requestPermissions(
                    new String[]{Manifest.permission.READ_EXTERNAL_STORAGE},
                    REQUEST_CODE);



        }
    });

 @Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
    Log.d(TAG,"Select Image Permission executed");

    if(requestCode == REQUEST_CODE){
        progressDialogUploadDp.setMessage("Uploading...");
       progressDialogUploadDp.show();

        if(grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED){
            Intent intent = new Intent(Intent.ACTION_PICK);
            intent.setType("image/*");
            intent.putExtra("imageUpdate","true");
            startActivityForResult(intent,REQUEST_CODE);
        }else{
            Toast.makeText(getActivity(), "No Permission Granted", Toast.LENGTH_SHORT).show();
        }
        return;
    }

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

论活动结果

 @Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {

    super.onActivityResult(requestCode, resultCode, data);

    if(requestCode == REQUEST_CODE && resultCode == Activity.RESULT_OK && data != null){

        try {
        Uri uri = data.getData();

        StorageReference filepath =
                storageReference.child("Photos").child("DPs").child(ID).child("profilepicture.jpg");
            InputStream inputStream = getActivity().getContentResolver().openInputStream(uri);

            Bitmap bitmap = BitmapFactory.decodeStream(inputStream);
            imageviewpropic.setImageBitmap(bitmap);

            filepath.putFile(uri).addOnSuccessListener(new OnSuccessListener<UploadTask.TaskSnapshot>() {
                @Override
                public void onSuccess(UploadTask.TaskSnapshot taskSnapshot) {

                    progressDialogUploadDp.hide();
                    progressDialogUploadDp.dismiss();


                }
            });

        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }


    }

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返回表格库，活动将在ActivityResult上运行，然后在Resume上运行。

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因此，您可以在onActivityResult上设置一个标志，并在onResume中设置一个IF来设置片段。

根据您所说的，您的活动似乎正在调用onCreate方法并再次设置默认片段。只有在没有保存状态时，才能在onCreate（）中创建新片段

if(savedInstanceState==null) setFragment(fragment);

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签入开发人员设置已选择“不保留活动”，因为如果此选项为enabledYes，则会发生此问题。请为整个活动提供代码。也照Akshay说的做，这可能有助于添加活动代码！是的，这似乎就是问题所在。我尝试添加if（savedInstanceState==null），但是默认的片段代码仍然得到执行。