如何开启存储权限？

Question

我已经设置：

<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>

在清单中。但是该应用程序在写入外部存储时仍然存在问题。在应用程序管理器中查看应用程序的存储权限被稀释了。如何启用它？为什么现在会发生这种情况？是因为新的 android 版本吗？

 Settings->Applications->Application Manager-><App name>->Permissions

Answer 1

试试这个来获得运行时权限：

if (ContextCompat.checkSelfPermission(sendNotificationActivity.this,Manifest.permission.READ_EXTERNAL_STORAGE)
                                != PackageManager.PERMISSION_GRANTED)
                        {
                            if (!ActivityCompat.shouldShowRequestPermissionRationale(sendNotificationActivity.this, Manifest.permission.READ_EXTERNAL_STORAGE)) {
                                AlertDialog.Builder alertBuilder = new AlertDialog.Builder(sendNotificationActivity.this);
                                alertBuilder.setCancelable(true);
                                alertBuilder.setTitle("Permission necessary");
                                alertBuilder.setMessage("Storage Permission is needed for sending Image.");
                                alertBuilder.setPositiveButton(android.R.string.yes, new DialogInterface.OnClickListener() {
                                    @TargetApi(Build.VERSION_CODES.JELLY_BEAN)
                                    public void onClick(DialogInterface dialog, int which) {

                                        Intent intent = new Intent(Settings.ACTION_APPLICATION_DETAILS_SETTINGS,
                                                Uri.parse("package:" + activity.getPackageName()));
                                        intent.addCategory(Intent.CATEGORY_DEFAULT);
                                        intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
                                        activity.startActivity(intent);
                                    }
                                });
                                AlertDialog alert = alertBuilder.create();
                                alert.show();

                            } else {
                                ActivityCompat.requestPermissions(sendNotificationActivity.this, new String[]{Manifest.permission.READ_EXTERNAL_STORAGE}, 541);
                            }
                        }

                        else {                      
                            Intent intent = new Intent(Intent.ACTION_PICK, MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
                            if (intent.resolveActivity(getPackageManager()) != null) {                            
                                startActivityForResult(intent, 2);
                            }
                        }

并覆盖这个：

@Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String permissions[], @NonNull int[] grantResults) {

        switch (requestCode) {

            case 541: {
                for( int i = 0; i < permissions.length; i++ ) {
                    if( grantResults[i] == PackageManager.PERMISSION_GRANTED ) {


                        Log.d("Permissions CAMERA", "Permission Granted: " + permissions[i]);
                        Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
                        intent.putExtra(MediaStore.EXTRA_OUTPUT, getPhotoFileUri(photoFileName));
                        if (intent.resolveActivity(getPackageManager()) != null) {                           
                            startActivityForResult(intent, 1);
                        }


                    } else if( grantResults[i] == PackageManager.PERMISSION_DENIED ) {
                        Log.d( "Permissions CAMERA", "Permission Denied: " + permissions[i] );
                    }
                }
                break;
            }
             default: {
                super.onRequestPermissionsResult(requestCode, permissions, grantResults);
            }
            break;
            }
            }

如何开启存储权限？

How to turn on storage permissions?

android

android-permissions

android-external-storage