Question

我是android的业余爱好者，我正在尝试从app上传文件到服务器，我需要请求用户的许可，但对话框不会弹出片段。我有一个 FilePath 类，它有助于获取路径，验证权限方法也在这个类中应该调出权限对话

public class FilePath{
    private static final int REQUEST_EXTERNAL_STORAGE = 1;
    private static String[] PERMISSIONS_STORAGE = {
            Manifest.permission.READ_EXTERNAL_STORAGE,
            Manifest.permission.WRITE_EXTERNAL_STORAGE

    };


    @TargetApi(Build.VERSION_CODES.KITKAT)
    public static String getPath(final Context context, final Uri uri) {




        // check here to KITKAT or new version
        final boolean isKitKat = Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT;

        // DocumentProvider
        if (isKitKat && DocumentsContract.isDocumentUri(context, uri)) {

            // ExternalStorageProvider
            if (isExternalStorageDocument(uri)) {
                final String docId = DocumentsContract.getDocumentId(uri);
                final String[] split = docId.split(":");
                final String type = split[0];

                if ("primary".equalsIgnoreCase(type)) {
                    return Environment.getExternalStorageDirectory() + "/"
                            + split[1];
                }
            }
            // DownloadsProvider
            else if (isDownloadsDocument(uri)) {

                final String id = DocumentsContract.getDocumentId(uri);
                final Uri contentUri = ContentUris.withAppendedId(
                        Uri.parse("content://downloads/public_downloads"),
                        Long.valueOf(id));

                return getDataColumn(context, contentUri, null, null);
            }
            // MediaProvider
            else if (isMediaDocument(uri)) {
                final String docId = DocumentsContract.getDocumentId(uri);
                final String[] split = docId.split(":");
                final String type = split[0];

                Uri contentUri = null;
                if ("image".equals(type)) {
                    contentUri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI;
                } else if ("video".equals(type)) {
                    contentUri = MediaStore.Video.Media.EXTERNAL_CONTENT_URI;
                } else if ("audio".equals(type)) {
                    contentUri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;
                }

                final String selection = "_id=?";
                final String[] selectionArgs = new String[] { split[1] };

                return getDataColumn(context, contentUri, selection,
                        selectionArgs);
            }
        }
        // MediaStore (and general)
        else if ("content".equalsIgnoreCase(uri.getScheme())) {

            // Return the remote address
            if (isGooglePhotosUri(uri))
                return uri.getLastPathSegment();

            return getDataColumn(context, uri, null, null);
        }
        // File
        else if ("file".equalsIgnoreCase(uri.getScheme())) {
            return uri.getPath();
        }

        return null;
    }


    public static String getDataColumn(Context context, Uri uri,
                                       String selection, String[] selectionArgs) {

        Cursor cursor = null;
        final String column = "_data";
        final String[] projection = { column };

        try {
            cursor = context.getContentResolver().query(uri, projection,
                    selection, selectionArgs, null);
            if (cursor != null && cursor.moveToFirst()) {
                final int index = cursor.getColumnIndexOrThrow(column);
                return cursor.getString(index);
            }
        } finally {
            if (cursor != null)
                cursor.close();
        }
        return null;
    }


    public static boolean isExternalStorageDocument(Uri uri) {
        return "com.android.externalstorage.documents".equals(uri
                .getAuthority());
    }


    public static boolean isDownloadsDocument(Uri uri) {
        return "com.android.providers.downloads.documents".equals(uri
                .getAuthority());
    }


    public static boolean isMediaDocument(Uri uri) {
        return "com.android.providers.media.documents".equals(uri
                .getAuthority());
    }

    public static boolean isGooglePhotosUri(Uri uri) {
        return "com.google.android.apps.photos.content".equals(uri
                .getAuthority());
    }

    public static void verifyStoragePermissions(Activity activity) {
        // Check if we have write permission
        int permission = ActivityCompat.checkSelfPermission(activity, Manifest.permission.WRITE_EXTERNAL_STORAGE);


        if (permission != PackageManager.PERMISSION_GRANTED) {
            // We don't have permission so prompt the user
            Log.d("Permission Checked","Checked permision!!!!!");
            ActivityCompat.requestPermissions(activity,
                    PERMISSIONS_STORAGE,
                    REQUEST_EXTERNAL_STORAGE

            );
        }

    }

}

然后我在片段类onCreate

中调用此验证权限方法

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                     Bundle savedInstanceState) {
// Inflate the layout for this fragment
 View v = inflater.inflate(R.layout.fragment_upload, container, false);
ivAttachment = (ImageView) v.findViewById(R.id.ivAttachment);
bUpload = (Button) v.findViewById(R.id.b_upload);
tvFileName = (TextView) v.findViewById(R.id.tv_file_name);
ivAttachment.setOnClickListener(this);
bUpload.setOnClickListener(this);

FilePath.verifyStoragePermissions(this.getActivity());


return v;
}

该片段包含在 MainActivity

上添加的BottomBar中

public class MainActivity extends AppCompatActivity {
    private static final int REQUEST_PERMISSION = 10;

    BottomBar mBottomBar;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);





        mBottomBar = BottomBar.attach(this,savedInstanceState);

        mBottomBar.setItemsFromMenu(R.menu.menu_main,new OnMenuTabClickListener()

        {


            public void onMenuTabSelected(@IdRes int i) {
                if(i==R.id.Bottombaritemone)
                {   NewsFRagment f = new NewsFRagment();
                    getSupportFragmentManager().beginTransaction().replace(R.id.main_container,f).commit();

                }
                else if(i==R.id.Bottombaritemtwo)
                {
                    Cardsfragment f =new Cardsfragment();
                    getSupportFragmentManager().beginTransaction().replace(R.id.main_container,f).commit();
                }
                else if(i==R.id.Bottombaritemthree)
                {
                    PhoneFragment f =new PhoneFragment();
                    getSupportFragmentManager().beginTransaction().replace(R.id.main_container,f).commit();
                }
                else if(i==R.id.Bottombaritemfour)
                {
                    UploadFragment f =new UploadFragment();
                    getSupportFragmentManager().beginTransaction().replace(R.id.main_container,f).commit();

                }
                else if(i==R.id.Bottombaritemfive)
                {
                    FavoritesFragment f =new FavoritesFragment();
                    getSupportFragmentManager().beginTransaction().replace(R.id.main_container,f).commit();
                }
            }



            @Override
            public void onMenuTabReSelected(@IdRes int i) {

            }
        });
        mBottomBar.mapColorForTab(0, "#F44336");
        mBottomBar.mapColorForTab(1,"#9C27B0");
        mBottomBar.mapColorForTab(2,"#03A9F4");
        mBottomBar.mapColorForTab(3,"#795548");
        mBottomBar.mapColorForTab(4,"#FF6F00");

        BottomBarBadge unread;
        unread = mBottomBar.makeBadgeForTabAt(3,"#FF0000",13);
        unread.show();


    }


    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_main, menu);
        return true;
    }

}

我在没有Bottom Bar的情况下对此进行了测试，并且弹出了权限对话框，但我不知道为什么它不在BottomBar碎片上我试图纠正但是我无法...请求帮助！< / p>

Answer 1

如果用户拒绝权限，则不会显示权限对话框。在第二次发布时，用户将获得“不再问”＃34;防止应用程序在将来询问此权限的选项。

然而，如果用户做了什么事情，那么在UX方面它是非常糟糕的，但没有任何东西可以互动。这种情况也必须处理。在调用requestPermissions之前，您需要检查以显示一个基本原理对话框，说明应用程序需要通过活动的应用程序来获取所请求的权限#ShowShowRequestPermissionRationale

结果是首次请求此权限时将显示合理对话框，如果用户曾将此权限标记为“永不再询问”，则会显示该结果。对于后一种情况，onRequestPermissionsResult将在没有任何权限授予对话框的情况下使用PERMISSION_DENIED进行调用。

我写了一个小gist on github来请求运行时权限。

同时检查此blog以完全了解运行时权限。

权限对话没有在api 23中显示片段

1 个答案: