未询问存储权限答案

【问题标题】：storage permissions not being asked未询问存储权限
【发布时间】：2019-05-07 19:45:42
【问题描述】：

我已将这些权限添加到清单文件中

<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />

<uses-feature android:name="android.hardware.location.gps" />

<uses-permission android:name="com.google.android.providers.gsf.permission.READ_GSERVICES" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />

但是当用户安装应用程序时，他被要求并允许的唯一权限是位置。

我也想向用户请求存储权限。这怎么可能？

【问题讨论】：

developer.android.com/training/permissions/requesting

标签： android permissions storage

【解决方案1】：

使用运行时权限代码在内部存储中添加数据。您可以为此使用 dexture 或简单权限库。

【讨论】：

【解决方案2】：

您是否尝试过 Android 文档指出的内容：

// Here, thisActivity is the current activity
if (ContextCompat.checkSelfPermission(thisActivity,
        Manifest.permission.READ_CONTACTS)
        != PackageManager.PERMISSION_GRANTED) {

    // Permission is not granted
    // Should we show an explanation?
    if (ActivityCompat.shouldShowRequestPermissionRationale(thisActivity,
            Manifest.permission.READ_CONTACTS)) {
        // Show an explanation to the user *asynchronously* -- don't block
        // this thread waiting for the user's response! After the user
        // sees the explanation, try again to request the permission.
    } else {
        // No explanation needed; request the permission
        ActivityCompat.requestPermissions(thisActivity,
                new String[]{Manifest.permission.READ_CONTACTS},
                MY_PERMISSIONS_REQUEST_READ_CONTACTS);

        // MY_PERMISSIONS_REQUEST_READ_CONTACTS is an
        // app-defined int constant. The callback method gets the
        // result of the request.
    }
} else {
    // Permission has already been granted
}

https://developer.android.com/training/permissions/requesting#java

【讨论】：

【解决方案3】：

对于“危险”权限（包括存储、位置、相机、日历等），您需要在安装时而不是在需要时向用户请求权限。请务必在每次需要权限时进行检查，因为用户可以随时撤销权限。

检查权限（在 Kotlin 中）（在本例中为 FINE_LOCATION，将其更改为您需要请求的任何权限）：

        if (ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION)
        != PackageManager.PERMISSION_GRANTED
    ) {
//if permission not granted, start function to request permission
//MY_PERMISSIONS_REQUEST is the requestCode, an int > 0
        ActivityCompat.requestPermissions(
            this,
            arrayOf(Manifest.permission.ACCESS_FINE_LOCATION),
            MY_PERMISSIONS_REQUEST
        )
    }

然后再重写onRequestPermissionsResult函数：

    override fun onRequestPermissionsResult(
    requestCode: Int,
    permissions: Array<String>, grantResults: IntArray
) {
    when (requestCode) {
        MY_PERMISSIONS_REQUEST -> {
            // If request is cancelled, the result arrays are empty.
            if ((grantResults.isNotEmpty() && grantResults[0] == PackageManager.PERMISSION_GRANTED)) {
                //granted - you are not able to use Location Functionality

            } else {
                // permission denied
                Toast.makeText(this, "Location Functionality Disabled.", Toast.LENGTH_LONG).show()
            }
            return
        }

        // Add other 'when' lines to check for other
        // permissions this app might request.
        else -> {
            // Ignore all other requests.
        }
    }

}

您也可以一次请求多个权限。 Android 6.0 multiple permissions

【讨论】：