android - java.lang.SecurityException : Permission Denial: reading com. android.providers.media.MediaProvider 在从画廊拍照时在 Android

Question

我正在尝试从图库中选择图像，但我的应用程序出现“出现问题”消息的异常。我以为我正确设置了 android WRITE_EXTERNAL_STORAGE 和 READ_EXTERNAL_STORAGE 权限，但我不断收到错误我应该怎么做才能让它工作？

这是我的日志猫错误

06-07 12:07:27.567    1692-1711/? E/DatabaseUtils﹕ Writing exception to parcel
    java.lang.SecurityException: Permission Denial: reading com.android.providers.media.MediaProvider uri content://media/external/images/media/359 from pid=2818, uid=10057 requires android.permission.READ_EXTERNAL_STORAGE, or grantUriPermission()
            at android.content.ContentProvider.enforceReadPermissionInner(ContentProvider.java:605)
            at android.content.ContentProvider$Transport.enforceReadPermission(ContentProvider.java:480)
            at android.content.ContentProvider$Transport.query(ContentProvider.java:211)
            at android.content.ContentProviderNative.onTransact(ContentProviderNative.java:112)
            at android.os.Binder.execTransact(Binder.java:453)

这是我的 Activity 代码

public class MainActivity extends Activity {
    private static int RESULT_LOAD_IMG = 1;
    String imgDecodableString;

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

    public void loadImagefromGallery(View view) {
        // Create intent to Open Image applications like Gallery, Google Photos
        Intent galleryIntent = new Intent(Intent.ACTION_PICK,
                android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
        // Start the Intent
        startActivityForResult(galleryIntent, RESULT_LOAD_IMG);
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        try {
            // When an Image is picked
            if (requestCode == RESULT_LOAD_IMG && resultCode == RESULT_OK
                    && null != data) {
                // Get the Image from data

                Uri selectedImage = data.getData();
                String[] filePathColumn = { MediaStore.Images.Media.DATA };

                // Get the cursor
                Cursor cursor = getContentResolver().query(selectedImage,
                        filePathColumn, null, null, null);
                // Move to first row
                cursor.moveToFirst();

                int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
                imgDecodableString = cursor.getString(columnIndex);
                cursor.close();
                ImageView imgView = (ImageView) findViewById(R.id.imgView);
                // Set the Image in ImageView after decoding the String
                imgView.setImageBitmap(BitmapFactory
                        .decodeFile(imgDecodableString));

            } else {
                Toast.makeText(this, "You haven't picked Image",
                        Toast.LENGTH_LONG).show();
            }
        } catch (Exception e) {
            Toast.makeText(this, "Something went wrong", Toast.LENGTH_LONG)
                    .show();
        }
    }
}

这是我的 Menifest.xml 文件代码

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.tazeen.image_fromgallery" >

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

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name=".MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

Answer 1

为了检查 API 级别 23 及以上的手动权限，我使用此代码。

public static final int MY_PERMISSIONS_REQUEST_READ_EXTERNAL_STORAGE = 123;

public boolean checkPermissionREAD_EXTERNAL_STORAGE(
            final Context context) {
        int currentAPIVersion = Build.VERSION.SDK_INT;
        if (currentAPIVersion >= android.os.Build.VERSION_CODES.M) {
            if (ContextCompat.checkSelfPermission(context,
                    Manifest.permission.READ_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {
                if (ActivityCompat.shouldShowRequestPermissionRationale(
                        (Activity) context,
                        Manifest.permission.READ_EXTERNAL_STORAGE)) {
                    showDialog("External storage", context,
                            Manifest.permission.READ_EXTERNAL_STORAGE);

                } else {
                    ActivityCompat
                            .requestPermissions(
                                    (Activity) context,
                                    new String[] { Manifest.permission.READ_EXTERNAL_STORAGE },
                                    MY_PERMISSIONS_REQUEST_READ_EXTERNAL_STORAGE);
                }
                return false;
            } else {
                return true;
            }

        } else {
            return true;
        }
    }

showDialog()

public void showDialog(final String msg, final Context context,
            final String permission) {
        AlertDialog.Builder alertBuilder = new AlertDialog.Builder(context);
        alertBuilder.setCancelable(true);
        alertBuilder.setTitle("Permission necessary");
        alertBuilder.setMessage(msg + " permission is necessary");
        alertBuilder.setPositiveButton(android.R.string.yes,
                new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int which) {
                        ActivityCompat.requestPermissions((Activity) context,
                                new String[] { permission },
                                MY_PERMISSIONS_REQUEST_READ_EXTERNAL_STORAGE);
                    }
                });
        AlertDialog alert = alertBuilder.create();
        alert.show();
    }

像这样在你的 Activity 检查中。

if (checkPermissionREAD_EXTERNAL_STORAGE(this)) {
            // do your stuff..
        }

别忘了添加 onRequestPermissionsResult。

@Override
    public void onRequestPermissionsResult(int requestCode,
            String[] permissions, int[] grantResults) {
        switch (requestCode) {
        case MY_PERMISSIONS_REQUEST_READ_EXTERNAL_STORAGE:
            if (grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                // do your stuff
            } else {
                Toast.makeText(Login.this, "GET_ACCOUNTS Denied",
                        Toast.LENGTH_SHORT).show();
            }
            break;
        default:
            super.onRequestPermissionsResult(requestCode, permissions,
                    grantResults);
        }
    }

快乐编码..