Question

我正在尝试将文件附加到我的项目中。但路径不会显示在文本视图中。代码中没有错误，但似乎找不到路径。我是新手创建一个片段。我怎样才能获得字符串路径？

以下是我的代码：

public class AttachmentsFragment extends Fragment {

    private Button btncf;
    private TextView tvaf;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_attachments,container,false);

            if(Build.VERSION.SDK_INT > Build.VERSION_CODES.M && ActivityCompat.checkSelfPermission(getContext(),android.Manifest.permission.WRITE_EXTERNAL_STORAGE)
                    != PackageManager.PERMISSION_GRANTED) {
                requestPermissions(new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE}, 1001);
            }

            btncf = view.findViewById(R.id.btn_choose_files);
            tvaf = view.findViewById(R.id.tv_choose_files_placeholder);

            btncf.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    new MaterialFilePicker()
                            .withActivity(getActivity())
                            .withRequestCode(1000)
                            .withHiddenFiles(true) // Show hidden files and folders
                            .start();
                }
            });
        return view;
    }

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

                startActivityForResult(data, requestCode);

            if (requestCode == 1000 && resultCode == RESULT_OK) {
                String filePath = data.getStringExtra(FilePickerActivity.RESULT_FILE_PATH);
                // Do anything with file
                tvaf.setText(filePath);
        }
    }

    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        switch (requestCode) {
            case 1001: {
                if(grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                    Toast.makeText(getActivity(), "Permission not granted!", Toast.LENGTH_SHORT).show();
                    isRemoving();
                }
            }
        }
    }
}

Answer 1

onActivityResult内有错误，删除startActivityForResult(data, requestCode);

工作函数应如下所示：

@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
        if (requestCode == 1000 && resultCode == RESULT_OK) {
            String filePath = data.getStringExtra(FilePickerActivity.RESULT_FILE_PATH);
            // Do anything with file
            tvaf.setText(filePath);
    }
}

在片段中使用此库时，您需要

.withSupportFragment(this)

另外，我建议检查buttonClick的权限，而不是onCreateView。

功能齐全的代码如下所示：

public class AttachmentsFragment extends Fragment {


public static final int PERMISSIONS_REQUEST_CODE = 0;
public static final int FILE_PICKER_REQUEST_CODE = 1;

public AttachmentsFragment() {
    // Required empty public constructor
}


@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    // Inflate the layout for this fragment
    View view = inflater.inflate(R.layout.fragment_attachments, container, false);

    Button pickButton = view.findViewById(R.id.btn_choose_files);
    pickButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            checkPermissionsAndOpenFilePicker();
        }
    });

    return view;
}

private void checkPermissionsAndOpenFilePicker() {
    String permission = Manifest.permission.READ_EXTERNAL_STORAGE;

    if (ContextCompat.checkSelfPermission(getContext(), permission) != PackageManager.PERMISSION_GRANTED) {
        if (ActivityCompat.shouldShowRequestPermissionRationale(getActivity(), permission)) {
            showError();
        } else {
            ActivityCompat.requestPermissions(getActivity(), new String[]{permission}, PERMISSIONS_REQUEST_CODE);
        }
    } else {
        openFilePicker();
    }
}

private void openFilePicker() {
    new MaterialFilePicker()
            .withSupportFragment(this)
            .withRequestCode(FILE_PICKER_REQUEST_CODE)
            .withHiddenFiles(true)
            .withTitle("Sample title")
            .start();
}

private void showError() {
    Toast.makeText(getContext(), "Allow external storage reading", Toast.LENGTH_SHORT).show();
}

@Override
public void onRequestPermissionsResult(int requestCode,
                                       @NonNull String permissions[], @NonNull int[] grantResults) {
    switch (requestCode) {
        case PERMISSIONS_REQUEST_CODE: {
            if (grantResults.length > 0
                    && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                openFilePicker();
            } else {
                showError();
            }
        }
    }
}

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

    if (requestCode == FILE_PICKER_REQUEST_CODE && resultCode == Activity.RESULT_OK) {
        String path = data.getStringExtra(FilePickerActivity.RESULT_FILE_PATH);

        if (path != null) {
            Log.d("Path (fragment): ", path);
            Toast.makeText(getContext(), "Picked file in fragment: " + path, Toast.LENGTH_LONG).show();
        }
    }
}

片段：无法从onActivityResult获取字符串路径

1 个答案: