Android adaptation – FileProvider

Android adaptation – FileProvider

Before because of

In response to Google’s call, the App is available on Android 8.0. Only the situations encountered in our App are recorded.

I refer to the FileProvider documentation and other resources that can be searched on the Web.

Adapter core

The core of this adaptation is the use of FileProvider.

AndroidManifest adaptation

Add a provider node to the Application node.

<manifest>.<application>.<provider
            android:name="androidx.core.content.FileProvider"
            android:authorities="${applicationId}.fileProvider"
            android:exported="false"
            android:grantUriPermissions="true">
                <meta-data
                    android:name="android.support.FILE_PROVIDER_PATHS"
                    android:resource="@xml/file_paths" />
        </provider>
    </appliction>
</manifest>
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The above writing method is basically fixed, many items can be modified, but it is not recommended to do, the following is just a record.

Item 1 can be modified

android:name="androidx.core.content.FileProvider"
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The above is the Provider class that specifies the service. The above is the Android AndroidX package provided by the class, can be customized. You can use a ContentProvider to provide the goal of the service.

Item 2 can be modified

android:authorities="${applicationId}.fileProvider"
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A unique string can be used. The above is the commonly used writing method.

Item 3 can be modified

android:name="android.support.FILE_PROVIDER_PATHS"
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Yes, you can change it, but if you don’t implement the Provider yourself, this value can only be this. This string is defined in the FileProvider class.

Item 4 can be modified

android:resource="@xml/file_paths"
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Defines the configuration file used by the FileProvider class. The file name is optional as long as it does not violate the naming convention.

Add a specific ContentProvider, FileProvider, package name androidx.core.content.

FileProvider ADAPTS files

File address res/ XML /file_paths.xml

The contents of the empty file are as follows

<?xml version="1.0" encoding="utf-8"? >
<paths>
</paths>
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Android Studio prompts for these five places.

<files-path name="name" path="path" />
<cache-path name="name" path="path" />
<external-path name="name" path="path" />
<external-files-path name="name" path="path" />
<external-cache-path name="name" path="path" />
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There’s another one on the website

<! -- this directory is only available on API 21+ devices. -->
<external-media-path name="name" path="path" />
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You can see another one in the code

<! -- The root directory of this definition is / -->
<root-path name="name" path="path" />
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The difference between the preceding -paths is that the root directory is defined differently.

The name attribute in the Path node

Unique not to repeat

The Path property of the Path node

The name of a folder that automatically includes subdirectories under the folder

Example:

<external-path name="pic" path="Pictures" />
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After this definition, all files in /sdcard/Pictures can be sent from your App to other apps for use.

The specific application

Our App doesn’t cover that much. These are simple applications.

Photo sharing

Scene, App internally generated a picture, and use the system to share.

The core code

Uri uri = null;
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
    uri = FileProvider.getUriForFile(this, getPackageName() + ".fileProvider", file);
} else {
    uri = Uri.fromFile(file);
}
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Video playback

There is a feature for video playback using the system player, while there is asynchronous video download. If the download is complete, play the local video. Will use this feature.

The core code

Uri uri = null;
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
    uri = FileProvider.getUriForFile(this, getPackageName() + ".fileProvider", file);
} else{ uri = Uri.fromFile(file); } // The above is the same as the image sharing. Intent.setflags (intent.flag_grant_read_uri_permission); intent.setflags (intent.flag_grant_read_uri_permission);Copy the code

conclusion

This adaptation is relatively simple. I think there are two things to note.

• I want to revise everything. I can’t leave anything out. This includes code and configuration
• Version of the judgment