尽管有权限，但写入外部存储的权限被拒绝 [英] Permission denied on writing to external storage despite permission

问题描述

我有一个 Android 7.0 测试设备，我的 APK 目标 = "targetSdkVersion 22"，带有:

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

与:

final File f = newFile(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES) + File.separator + "DressUpBaby" + photonumber + ".png");f.createNewFile();

此时我收到警告:

W/System.err: java.io.IOException: 权限被拒绝

如何让它保存文件?当我在 Eclipse 上创建它时，这是有效的，但现在我已经更新并转移到 Android Studio，它似乎破坏了一些东西.

解决方案

如果您在 API 级别 23 或更高级别上运行应用程序，则必须在运行时请求权限.

请求权限:

String[] 权限 = {Manifest.permission.WRITE_EXTERNAL_STORAGE};请求权限(权限，WRITE_REQUEST_CODE)；

然后处理结果:

@Overridepublic void onRequestPermissionsResult(int requestCode, String permissions[], int[] grantResults) {开关(请求代码){案例 WRITE_REQUEST_CODE:if(grantResults[0] == PackageManager.PERMISSION_GRANTED){//的确.}别的{//拒绝.}休息;}}

有关更多信息，请访问 在运行时请求权限 - Android 文档

I have an Android 7.0 test device and my APK targets = "targetSdkVersion 22", with:

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

with:

final File f = new 
File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES) + File.separator + "DressUpBaby" + photonumber + ".png");
f.createNewFile();

and at this point I get the warning:

W/System.err: java.io.IOException: Permission denied

How to get it to save the file? This was working when I created this on Eclipse, but now that I have updated and moved to Android Studio it seems to have broken something.

解决方案

If you're running your app on API level 23 or greater you have to request permission at runtime.

Request permission:

String[] permissions = {Manifest.permission.WRITE_EXTERNAL_STORAGE};
requestPermissions(permissions, WRITE_REQUEST_CODE);

Then handle the result:

@Override
public void onRequestPermissionsResult(int requestCode, String permissions[], int[] grantResults) {
    switch (requestCode) {
       case WRITE_REQUEST_CODE:
         if(grantResults[0] == PackageManager.PERMISSION_GRANTED){
           //Granted.


         }
       else{
           //Denied.
         }
        break;
    }
}

For more information visit Requesting Permissions at Run Time - Android Doc

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