java - 如何检查运行时权限中点击 "Allow"选项

Question

在我的应用程序中，我想对存储和相机使用运行时权限。

为此，我编写了下面的代码，它对我有用，但我想知道用户是否单击“允许”选项。

private static final int CAMERA_REQ = 2008;
private static final int STORAGE_REQ = 2005;
@OnClick(R.id.newAddFrag_uploadImageRootLay)
void uploadImage() {
    new MaterialDialog.Builder(getActivity())
            .title("Select")
            .items(R.array.uploadImages)
            .titleGravity(GravityEnum.CENTER)
            .itemsGravity(GravityEnum.CENTER)
            .typeface("IranSans.ttf", "IranSans.ttf")
            .itemsIds(R.array.itemIds)
            .itemsCallback(new MaterialDialog.ListCallback() {
                @Override
                public void onSelection(MaterialDialog dialog, View view, int which, CharSequence text) {
                    switch (which) {
                        case 0:
                            if (checkIfStorage(context)) {
                                Intent galleryIntent = new Intent(Intent.ACTION_PICK,
                                        android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
                                startActivityForResult(galleryIntent, REQUEST_PICK_PHOTO);
                            } else {
                                ActivityCompat.requestPermissions(getActivity(), new String[]{Manifest.permission.READ_EXTERNAL_STORAGE,
                                        Manifest.permission.WRITE_EXTERNAL_STORAGE}, STORAGE_REQ);
                            }
                            break;
                        case 1:
                            if (checkIfCamera(context)) {
                                captureImage();
                            } else {
                                ActivityCompat.requestPermissions(getActivity(), new String[]{Manifest.permission.CAMERA}, CAMERA_REQ);
                            }
                            break;
                    }
                }
            })
            .show();
}

private boolean checkIfCamera(Context context) {
    int result = ContextCompat.checkSelfPermission(context, Manifest.permission.CAMERA);
    if (result == PackageManager.PERMISSION_GRANTED) {
        return true;
    } else {
        return false;
    }
}

private boolean checkIfStorage(Context context) {
    int result = ContextCompat.checkSelfPermission(context, Manifest.permission.READ_EXTERNAL_STORAGE);
    if (result == PackageManager.PERMISSION_GRANTED) {
        return true;
    } else {
        return false;
    }
}

@Override
public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
    if (requestCode == 0) {
        if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED
                && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
            newAddFrag_uploadImageRootLay.setEnabled(true);
            newAddFrag_uploadImageSuccessTxt.setEnabled(true);
            newAddFrag_uploadImageLay.setEnabled(true);
        }
    }
    if (requestCode == CAMERA_REQ) {
        Log.e("permissionsLog", "CAMERA");
    }
    if (requestCode == STORAGE_REQ) {
        Log.e("permissionsLog", "STORAGE");
    }
}

Answer 1

请求权限时隐含以下规则:

• 如果您在 android.support.v4.app.Fragment 中请求权限，您只需调用 requestPermissions(因为它已在支持库中提供)。
• 如果您在 Fragment 中调用 ActivityCompat.requestPermissions，则 onRequestPermissionsResult 回调将传递给 Activity，而不是 Fragment。

由于您在 android.support.v4.app.Fragment 中请求权限，因此只需使用 requestPermissions 或在 Activity 中覆盖 onRequestPermissionsResult 并在那里处理结果。