Android的READ_EXTERNAL_STORAG​​E权限不工作 [英] Android READ_EXTERNAL_STORAGE permission not working

问题描述

我想创建一个简单的应用程序，可以从库的应用程序得到的图像，并在一个ImageButton的显示。我用API 21上运行的Andr​​oid 5.0.1手机测试。不幸的是，无论我怎么努力我不断收到安全错误 - 甚至当我指定的权限

I'm trying to create a simple app that can get an image from the Gallery app and display it on an imageButton. I'm testing with API 21 on a phone running Android 5.0.1. Unfortunately, no matter what I try I keep getting a security error - even when I specify the permissions.

我的code获取检索图像：

My code for getting retrieving the image is:

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent imageReturnedIntent){
    super.onActivityResult(requestCode, resultCode, imageReturnedIntent);

    switch(requestCode){
        case PICK_IMAGE_REQUEST:
            if(resultCode == RESULT_OK && imageReturnedIntent != null && imageReturnedIntent.getData() != null) {
                Uri uri = imageReturnedIntent.getData();
                try {
                    Bitmap bitmap = MediaStore.Images.Media.getBitmap(getContentResolver(), uri);
                    // Log.d(TAG, String.valueOf(bitmap));
                    ImageButton ib = (ImageButton) findViewById(R.id.inputImg);
                    ib.setImageBitmap(bitmap);
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            break;
    }
}

在code工作时，我尽量选择Dropbox的图像，但是当我选择从画廊的图像，我得到

The code works when I try to select an image from Dropbox, but when I select an image from gallery, I get

java.lang.SecurityException: Permission Denial: reading com.android.providers.media.MediaProvider uri content://media/external/images/media/35634 from pid=25240, uid=10070 requires android.permission.READ_EXTERNAL_STORAGE, or grantUriPermission()

我提出的用许可标签READ_EXTERNAL_STORAG​​E明显的子：

I made the use-permission tag for READ_EXTERNAL_STORAGE a child of manifest:

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
package="[REDACTED]">

    <uses-sdk
    android:minSdkVersion="14"
    android:targetSdkVersion="23" />

    <uses-permission tools:node="replace" android:name="android.permission.READ_EXTERNAL_STORAGE" android:maxSdkVersion="18" />

    <application>
        [REDACTED]
    </application>

</manifest>

我已经搜查高和低的其他职位，但仍似乎无法弄清楚，为什么我仍然得到这个讨厌的错误。

I've searched high and low on other posts, but still can't seem to figure out why I'm still getting this pesky error.

推荐答案

问题
您有误差

PROBLEM
Your have the error

java.lang.SecurityException异常：权限被拒绝：读取com.android.providers.media.MediaProvider URI内容：//媒体/外部/图片/媒体/ 35634的PID = 25240，UID = 10070ṛ equires机器人.permission.READ_EXTERNAL_STORAG​​E 或grantUriPermission（）。

java.lang.SecurityException: Permission Denial: reading com.android.providers.media.MediaProvider uri content://media/external/images/media/35634 from pid=25240, uid=10070 requires android.permission.READ_EXTERNAL_STORAGE, or grantUriPermission().

原因
你是不是给正确的，因为权限的Andr​​oid版本：maxSdkVersion =18，根据文档其中。

CAUSE
You are not giving correctly permissions because of android:maxSdkVersion="18", which according to documentation.

在此许可应给予您的应用程序的API最高水平。如果你的应用程序需要的权限不再需要开始在某一个API级别设置该属性是非常有用的。

The highest API level at which this permission should be granted to your app. Setting this attribute is useful if the permission your app requires is no longer needed beginning at a certain API level.

只要你没给的权限为 API 21 您的应用程序表现正常。

As long as you didn't give permissions to API 21 your app is behaving ok.

检查<一href="http://stackoverflow.com/questions/20328082/require-permission-only-for-older-android-versions-maxsdkversion-does-not-work">this主题进一步的信息。

解决方案：
如果你想给在读的权限 API 21 ，您必须声明为：

SOLUTION
If you wanna give read permissions under API 21, you must declare them as:

<uses-permission 
    android:name="android.permission.READ_EXTERNAL_STORAGE"
    android:maxSdkVersion="21" />

---

重要提示：

此才有意义，当你需要提供额外的权限，因为一些旧的API的要求，新的版本没有权限，所以用户体验获取的提高，因为你只在需要时要求一定的权限。的

所以（在这种情况下）的正确方式将是：

So (in this case) the correct way will be:

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

---

加上
如果你想保存的数据，必须添加 WRITE_EXTERNAL_STORAG​​E 的权限。

---

ADD ON
If you want to save data you must add WRITE_EXTERNAL_STORAGE permissions.

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

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