[JAVA] Notes on calling Installer on Android App

When I tried to create an application that updates and installs after a long time, there were various changes around the authority, so I wrote a memo

environment

compileSdkVersion 29 minSdkVersion 24 targetSdkVersion 29

Source code

Use the following for the permission when skipping to the installer with Intent

AndroidManifest.xml

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

You have to go through FileProvider to install Dowloaded apk Many articles still use SupportLibrary.v4, but this time I will use androidx

build.gradle

implementation 'androidx.core:core:{current version}'

FileProvider is added as below

AndroidManifest.xml

<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>

After that, as written in various articles, just skip it with the Intent that was suitable for each Android version

MainActivity.java

            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
                Uri fileUri = FileProvider.getUriForFile(MainActivity.this,
                        MainActivity.this.getApplicationContext().getPackageName() + ".fileprovider",
                        file);
                Intent i = new Intent(Intent.ACTION_INSTALL_PACKAGE);
                i.setData(fileUri);
                i.setFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
                MainActivity.this.startActivity(i);
            } else {
                Uri fileUri = Uri.fromFile(file);
                Intent i = new Intent(Intent.ACTION_VIEW);
                i.setDataAndType(fileUri, APK_MIME_TYPE);
                i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
                MainActivity.this.startActivity(i);
            }

I think it may change depending on the environment, but this is enough that's all