Android调用应用安装界面方法

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

<paths>
    <external-files-path
        name="external_storage_root"
        path="."/>
</paths>

 <provider
            android:exported="false"
            android:grantUriPermissions="true"
            android:name="androidx.core.content.FileProvider"
            android:authorities="起一个独特的名字.fileprovider">
            <meta-data
                android:name="android.support.FILE_PROVIDER_PATHS"
                android:resource="@xml/provider_paths"
                />
        </provider>

private void iniAPK() {
        Intent intent = new Intent(Intent.ACTION_VIEW);
        intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) { // 7.0+以上版本
            Uri apkUri = FileProvider.getUriForFile(this, "这是清单配置文件文件起的独特的名字.fileprovider", file);  
            intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
            intent.setDataAndType(apkUri, "application/vnd.android.package-archive");
        } else {
            intent.setDataAndType(Uri.fromFile(file), "application/vnd.android.package-archive");
        }
       this.startActivity(intent);
 
 
    }