android 8訪問SD卡報錯

錯誤如下：

COPY FILE ERR :/storage/emulated/0/DCIM/Camera/IMG_20191110_064743_365.jpg: open failed: EACCES (Permission denied)

在AndroidManifest.xml中申請權限：

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

<!--外部存儲的寫權限-->
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<!--外部存儲的讀權限-->
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />


<uses-permission tools:ignore="ProtectedPermissions"  android:name="android.permission.WRITE_MEDIA_STORAGE" />
<uses-permission tools:ignore="ProtectedPermissions"  android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS" />

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

後仍然報錯。

 

一、添加動態申請權限：

public static void verifyStoragePermissions(Activity activity) {
    if (Build.VERSION.SDK_INT >= 23) {
        int REQUEST_CODE_PERMISSION_STORAGE = 100;
        String[] permissions = {
                Manifest.permission.READ_EXTERNAL_STORAGE,
                Manifest.permission.WRITE_EXTERNAL_STORAGE
        };

        for (String str : permissions) {
            Log.d(TAG,str+" : "+activity.checkSelfPermission(str));
            if (activity.checkSelfPermission(str) != PackageManager.PERMISSION_GRANTED) {
                activity.requestPermissions(permissions, REQUEST_CODE_PERMISSION_STORAGE);
                //return;
            }
        }
    }
}

還是報錯。

 

二、修改build.gradle中

targetSdkVersion 29 -> targetSdkVersion 23

問題解決！