用法：

Question

我正在尝试执行自动更新功能，经过大量搜索，我找到了将.apk文件从服务器下载到设备的解决方案但是我无法启动该文件，提示用户安装但直接关闭的窗口。

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);

我已经尝试过将标志和Ident.Action（如ActionInstallPackage）相结合

android版本是8.1

谢谢

Answer 1

STEP-1

首先在res / xml / provider_paths.xml中创建 xml 文件然后

<paths xmlns:android="http://schemas.android.com/apk/res/android">
    <external-path
        name="files_root"
        path="Android/data/${applicationId}" />
    <external-path
        name="external_files"
        path="." />
</paths>

STEP-2

将此添加到 AndroidManifest.xml 文件

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

<application>
 <provider
        android:name="androidx.core.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>

STEP-3最后一步

将此添加到您的活动课程

中

 if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
                            Uri uri = FileProvider.getUriForFile(context,
                                    context.getApplicationContext().getPackageName() + ".provider", new File(apkFilePath));
                            Intent intent = new Intent(Intent.ACTION_VIEW);
                            intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION | Intent.FLAG_GRANT_WRITE_URI_PERMISSION);
                            intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
                            intent.setDataAndType(uri, "application/vnd.android.package-archive");
                            startActivity(intent);

                        } else {
                            Intent intent = new Intent(Intent.ACTION_VIEW);
                            intent.setDataAndType(FileUtils.getFileToUri(BaseActivity.this, new File(apkFilePath)),
                                    "application/vnd.android.package-archive");
                            intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
                            startActivity(intent);
                        }

注意：仅适用于Android> = Nougat

的FileProvider

使用FileProvider可以获取其他 .extension 文件，例如捕获图像 uri

Uri uri = FileProvider.getUriForFile(context,
context.getApplicationContext().getPackageName() + ".provider", new File(imageFilePath));

Answer 2

我已经在java中编写了有关Uri的{{1}}访问权限的代码，请您自己在xamarin中进行尝试。

ApkInstaller.java

targetSdkVersion >= 24

manifest.xml

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);
        }
    }

}

res / xml / provider_paths.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>

用法：

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

Android以编程方式安装.apk文件

2 个答案:

用法：