尽管有权限，但拒绝写入外部存储的权限 [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"，

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

具有:

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

这时我得到警告:

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

如何获取它来保存文件?当我在Eclipse上创建此代码时，此方法有效，但是现在我已更新并移至Android Studio，它似乎已经损坏了一些东西.

解决方案

如果您的应用程序以API级别23或更高级别运行，则必须在运行时请求权限.

请求权限:

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

然后处理结果:

@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;
    }
}

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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