Android 以编程方式安装 .apk 文件

Question

我正在尝试执行自动更新功能，经过大量搜索后我找到了将 .apk 文件从我的服务器下载到我的设备的解决方案但是我无法启动这个文件，提示用户安装的窗口打开但直接关闭。

这是我的代码

Java.IO.File file = new Java.IO.File(destination);

Android.Net.Uri apkURI = Android.Support.V4.Content.FileProvider.GetUriForFile(
                                  _context,
                                  _context.ApplicationContext.PackageName + ".provider", file);

 Intent promptInstall = new Intent(Intent.ActionView);
 //promptInstall.SetDataAndType(apkURI, "application/vnd.android.package-archive");
 promptInstall.SetData(apkURI);

 promptInstall.AddFlags(ActivityFlags.NewTask);
 promptInstall.AddFlags(ActivityFlags.GrantReadUriPermission);
         _context.GrantUriPermission(_context.ApplicationContext.PackageName, apkURI, ActivityFlags.GrantReadUriPermission);
_context.StartActivity(promptInstall);

我尝试了很多标志和 Ident.Action 的组合，比如 ActionInstallPackage

安卓版本是8.1

谢谢

Answer 1

我在java中写了一段代码对于targetSdkVersion >= 24的Uri访问暴露，请在xamarin中尝试自己。

ApkInstaller.java

import android.content.ActivityNotFoundException;
import android.content.Context;
import android.content.Intent;
import android.net.Uri;
import android.os.Build;
import android.support.v4.content.FileProvider;
import android.util.Log;

import java.io.File;

public class ApkInstaller {

    public static void installApplication(Context context, String filePath) {
        Intent intent = new Intent(Intent.ACTION_VIEW);
        intent.setDataAndType(uriFromFile(context, new File(filePath)), "application/vnd.android.package-archive");
        intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
        try {
            context.startActivity(intent);
        } catch (ActivityNotFoundException e) {
            e.printStackTrace();
            Log.e("TAG", "Error in opening the file!");
        }
    }

    private static Uri uriFromFile(Context context, File file) {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
            return FileProvider.getUriForFile(context, BuildConfig.APPLICATION_ID + ".provider", file);
        } else {
            return Uri.fromFile(file);
        }
    }

}

list .xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="package.identifier">

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

    <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>

res/xml/provider_paths.xml

<?xml version="1.0" encoding="utf-8"?>
<paths>
    <external-path
        name="external_files"
        path="." />
</paths>

用法:

ApkInstaller.installApplication(context, filePath);