android app下载apk文件并打开（安装）

Question

我想知道您是否可以提供帮助，我正在尝试在版本检查后下载一个 apk 文件作为更新。它正在下载 apk，但它不会打开 apk 文件它在尝试打开 apk 时打印错误

错误 ：

E/UpdateAPP: Update error! file:///storage/emulated/0/download/update.apk exposed beyond app through Intent.getData()

代码 ：

public class UpdateApp extends AsyncTask<String,Void,Void> {

    private Context context;

    public void setContext(Context contextf){

        context = contextf;

    }

    @Override

    protected Void doInBackground(String... arg0) {

        try {

            URL url = new URL(arg0[0]);

            HttpURLConnection c = (HttpURLConnection) url.openConnection();

            c.setRequestMethod("GET");

            c.setDoOutput(true);

            c.connect();

            String PATH = Environment.getExternalStorageDirectory() + "/download/";

            File file = new File(PATH);

            file.mkdirs();

            File outputFile = new File(file, "update.apk");

            if(outputFile.exists()){

                outputFile.delete();

            }

            FileOutputStream fos = new FileOutputStream(outputFile);

            InputStream is = c.getInputStream();

            byte[] buffer = new byte[1024];

            int len1 = 0;

            while ((len1 = is.read(buffer)) != -1) {

                fos.write(buffer, 0, len1);

            }

            fos.close();

            is.close();

            Intent intent = new Intent(Intent.ACTION_VIEW);

            intent.setDataAndType(Uri.fromFile(new File(Environment.getExternalStorageDirectory() + "/download/" + "/update.apk")), "application/vnd.android.package-archive");

            intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK); // without this flag android returned a intent error!

            context.startActivity(intent);

        } catch (Exception e) {

            Log.e("UpdateAPP", "Update error! " + e.getMessage());

        }

        return null;

    }}

我的 targetSdkVersion ：

targetSdkVersion 27

谢谢您的帮助

Answer 1

从 API 26 开始，“REQUEST_INSTALL_PACKAGES”权限是实现安装 apk 文件的必要权限。在 res/xml 文件夹中创建“file_paths.xml”以使用 FileProvider api<?xml version="1.0" encoding="utf-8"?><paths xmlns:android="http://schemas.android.com/apk/res/android">&nbsp; &nbsp; <external-path name="" path="/" /></paths>在 AndroidManifest.xml 中声明 FileProvider 和权限笔记。我使用的是 Androidx 版本的 FileProvider，如果你不使用 androidx，请确保 android.support.v4.content.FileProvider<uses-permission android:name="android.permission.REQUEST_INSTALL_PACKAGES" />&nbsp;<provider&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; android:name="androidx.core.content.FileProvider"&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; android:authorities="{PACKAGE_NAME}.fileprovider"&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; android:exported="false"&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; android:grantUriPermissions="true">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <meta-data&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; android:name="android.support.FILE_PROVIDER_PATHS"&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; android:resource="@xml/file_paths" /></provider>通过 FileProvider api 获取“Uri”并请求安装权限private fun openFile(file: File) {&nbsp; &nbsp; &nbsp; &nbsp; val uri = if (Build.VERSION.SDK_INT >= 24) {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; val authority = packageName + ".fileprovider"&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; FileProvider.getUriForFile(this, authority, file)&nbsp; &nbsp; &nbsp; &nbsp; } else {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Uri.fromFile(file)&nbsp; &nbsp; &nbsp; &nbsp; }&nbsp; &nbsp; &nbsp; &nbsp; val myMime = MimeTypeMap.getSingleton()&nbsp; &nbsp; &nbsp; &nbsp; val mimeType = myMime.getMimeTypeFromExtension(file.extension)&nbsp; &nbsp; &nbsp; &nbsp; val intent = Intent(Intent.ACTION_VIEW).apply {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; setDataAndType(uri, mimeType)&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; flags = Intent.FLAG_ACTIVITY_NEW_TASK&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION)&nbsp; &nbsp; &nbsp; &nbsp; }&nbsp; &nbsp; &nbsp; &nbsp; if (Build.VERSION.SDK_INT >= 26 && !packageManager.canRequestPackageInstalls()) {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; startActivity(&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Intent(&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Settings.ACTION_MANAGE_UNKNOWN_APP_SOURCES,&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Uri.parse("package:$packageName")&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; )&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; )&nbsp; &nbsp; &nbsp; &nbsp; } else {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; intent.action = Intent.ACTION_VIEW&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; startActivity(intent)&nbsp; &nbsp; &nbsp; &nbsp; }&nbsp; &nbsp; }编辑 -> 删除在我的项目中使用的特定方法。