解决android.os.FileUriExposedExcep

今天在使用Android7.0手机升级app的时出现了该问题，然后上StackOverFlow查了一下,找到了几种方法，推荐使用第二种，简单快捷

The app crashes when trying to open a file. It work below Android N, but on Android N it crashes. It only crashes when I try to open a file from the SD card, not from the system partition.

解决方法 ①：

If your targetSdkVersion is 24 or higher, we have to use FileProvider class to give access to the particular file or folder to make them accessible for other apps.

Steps to replace file:// uri with content:// uri:

• add a FileProvider tag in AndroidManifest.xml under tag.

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    ...
    <application
        ...
        <provider
            android:name="android.support.v4.content.FileProvider"
            android:authorities="${applicationId}.provider"
            android:exported="false"
            android:grantUriPermissions="true">
            <meta-data
                android:name="android.support.FILE_PROVIDER_PATHS"
                android:resource="@xml/provider_paths"/>
        </provider>
    </application>
</manifest>

• then create a provider_paths.xml file in xml folder under res folder. Folder may be needed to create if it doesn't exist. The content of the file is shown below. It describes that we would like to share access to the External Storage at root folder (path=".") with the name external_files.

<?xml version="1.0" encoding="utf-8"?>
<paths xmlns:android="http://schemas.android.com/apk/res/android">
    <external-path name="external_files" path="."/>
</paths>

• The final step is to change the line of code below in

Uri photoURI = Uri.fromFile(createImageFile());

to

Uri photoURI = FileProvider.getUriForFile(context, context.getApplicationContext().getPackageName() + ".provider", createImageFile());

解决方法 ②:

Besides the solution using the FileProvider, there is another way to work around this. use this codes in your project application onCreate();

StrictMode.VmPolicy.Builder builder = new StrictMode.VmPolicy.Builder();
StrictMode.setVmPolicy(builder.build());
builder.detectFileUriExposure()

May be wrong in the third line

you can run like this:

StrictMode.VmPolicy.Builder builder = new StrictMode.VmPolicy.Builder();
        StrictMode.setVmPolicy(builder.build());
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
            builder.detectFileUriExposure();
        }

StackOverFlow:
http://stackoverflow.com/questions/38200282/android-os-fileuriexposedexception-file-storage-emulated-0-test-txt-exposed