相关配置

AndroidManifest.xml

<!--相关权限-->
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
<uses-permission android:name="android.permission.CHANGE_WIFI_STATE" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.REQUEST_INSTALL_PACKAGES" />
<application android:networkSecurityConfig="@xml/network_security_config">
      <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>
</application>

创建network_security_config.xml，解决Android9.0明文请求

<?xml version="1.0" encoding="utf-8"?>
<network-security-config>
    <base-config cleartextTrafficPermitted="true" />
</network-security-config>

创建file_paths.xml，解决Android7.0 uri共享文件

<?xml version="1.0" encoding="utf-8"?>
<paths>
    <!--
         代表 context.getFileDir()
         文件保存路径为：/data/应用包名/files/
         Uri：content://${applicationId}.provider/fileDir/
     -->
    <files-path
        name="fileDir"
        path="." />
    <!--
       代表 context.getExternalFilesDir()
       文件保存路径为：/storage/emulated/0/Android/data/应用包名/files/
       Uri：content://${applicationId}.provider/filePath/
   -->
    <external-files-path
        name="filePath"
        path="." />
    <!--
        代表 context.getCacheDir()
        文件保存路径为：/data/应用包名/cache/
        Uri：content://${applicationId}.provider/cache-path/
    -->
    <!--name自定义  .为根路径-->
    <cache-path
        name="cache-path"
        path="." />
    <!--
        代表 getExternalCacheDir()
        文件保存路径为：/storage/emulated/0/Android/data/应用包名/cache/
        Uri:content://${applicationId}.provider/external-cache-path/
    -->
    <!--name自定义  .为SDCard/Android/data/应用包名/cache/-->
    <external-cache-path
        name="external-cache-path"
        path="." />
    <!--
        自定义getExternalCacheDir()
        文件保存路径为：/storage/emulated/0/Android/data/应用包名/cache/update/
        Uri:content://${applicationId}.provider/external-cache-custom-path/
    -->
    <!--name自定义  update_file为SDCard/Android/data/应用包名/cache/update/和gettExternalCacheDirectory对应创建的文件夹保持一致-->
    <external-cache-path
        name="external-cache-custom-path"
        path="update" />
    <!--
        代表 Environment.getExternalStorageDirectory()
        文件保存路径为：/storage/emulated/0/updateFile/
        Uri为：content://${applicationId}.provider/sdcard_root_externalStorageDirectory/
    -->
    <external-path
        name="sdcard_root_externalStorageDirectory"
        path="updateFile" />
    <!--path要和代码中Environment.getExternalStorageDirectory(), "update" 保持一致否则异常
        java.lang.IllegalArgumentException: Failed to find configured root that contains /storage/emulated/0/update/-->
</paths>

发起Install Apk意图，解决Android7.0共享文件URI转换，解决Android8.0未知来源apk安装

Intent intent = new Intent(Intent.ACTION_VIEW);
Uri contentUri;
//解决Android7.0 共享文件uri转换
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
    contentUri = FileProvider.getUriForFile(context, context.getPackageName() + ".fileprovider", apkFile);
} else {
    contentUri = Uri.fromFile(apkFile);
}
//解决Android8.0未知来源apk安装
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
    intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION | Intent.FLAG_GRANT_WRITE_URI_PERMISSION);
 }
if (contentUri != null) {
    intent.setDataAndType(contentUri, "application/vnd.android.package-archive");
    context.startActivity(intent);
}

未知来源权限请求回调

public void onActivityResult(int requestCode, int resultCode, Context context) {
  if (resultCode == RESULT_OK) {
    if (requestCode == 1) {
        Log.e(TAG, "设置允许未知来源安装，重新发起安装"); 
    } else {
        if (requestCode == 1) {
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) { 
                boolean hasInstallPermission = context.getPackageManager().canRequestPackageInstalls(); 
                if (!hasInstallPermission) {
                    Log.e(TAG, "没有赋予 未知来源安装权限"); 
                }
            }
        } else if (requestCode == 2) {
            Log.e(TAG, "从安装页面回到欢迎页面--拒绝安装");
        }
    }
}