/**

     * 安装apk

     *

     * @param context

     * @param apkPath

     */

    public static void installApk(Context context, String apkPath) {

        try {

            /**

             * provider

             * 处理android 7.0 及以上系统安装异常问题

             */

            File file = new File(apkPath);

            Intent install = new Intent();

            install.setAction(Intent.ACTION_VIEW);

            install.addCategory(Intent.CATEGORY_DEFAULT);

            install.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);

            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {

                Uri apkUri = FileProvider.getUriForFile(context, "com.chao.app.fileprovider", file);//在AndroidManifest中的android:authorities值

                Log.d("======", "apkUri=" + apkUri); install.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);//添加这一句表示对目标应用临时授权该Uri所代表的文件

                install.setDataAndType(apkUri, "application/vnd.android.package-archive");

            } else {

                install.setDataAndType(Uri.fromFile(file), "application/vnd.android.package-archive");

            }

            context.startActivity(install);

    } catch (Exception e) {

        Log.d("======", e.getMessage());

       Toast.makeText(context, "文件解析失败", Toast.LENGTH_SHORT).show();

        deleteFile(apkPath);

     }

 }

<provider

        android:name="android.support.v4.content.FileProvider"

        android:authorities="com.chao.app.fileprovider"

        android:grantUriPermissions="true"

        android:exported="false">

        <meta-data

            android:name="android.support.FILE_PROVIDER_PATHS"

            android:resource="@xml/file_paths" />

 </provider>

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

<?xml version="1.0" encoding="utf-8"?>

<resources>

    <paths>

        <external-path path="" name="download" />

    </paths>

</resources>