native

How can I set the value of “Double” type variable of my Class by JNI?

由 狂风中的少年 提交于 2019-12-23 01:19:18
问题 If I just want to set value to Double type variable, I may code like: public static native int getDoubleVar(Double dobj); JNIEXPORT jint JNICALL test_jni_Native_testGet(JNIEnv *env, jclass type, jobject dobj) { jclass DoubleClass = env->FindClass("java/lang/Double"); jfieldID valueID = env->GetFieldID(DoubleClass, "value", "D"); env->SetDoubleField(dobj, valueID, 2.3); return 0; } These codes toke effect. But, when I tried to set the value of a "Double" variable of a class by JNI, I can't get

svg-android imageview not working

由 泪湿孤枕 提交于 2019-12-22 19:58:22
问题 I have a need to show svg files in my android app. svg-android seems like the only library that has any documentation and thus my first approach. The only example available demonstrates how to create an imageview attach an svg image and attach it to the main content view. I however want a svg file to show up on a RelativeLayout I already have defined. I attempted an implementation like so: ImageView imageView = new ImageView(this); SVG svg = SVGParser.getSVGFromResource(getResources(), R.raw

React Native & react-native-web-player & React Native for Web

由 牧云@^-^@ 提交于 2019-12-22 13:06:51
React Native & react-native-web-player & React Native for Web https://github.com/dabbott/react-native-web-player https://dabbott.github.io/react-native-web-player/ import React, { Component } from 'react' import { AppRegistry, StyleSheet, Text, View, } from 'react-native' class App extends Component { render() { return ( <View style={styles.container}> <Text style={styles.welcome}> Welcome to React Native! </Text> <View style={{height: 100, width: "100%" }}> <View style={{flex: 1, backgroundColor: 'powderblue'}} /> <View style={{flex: 2, backgroundColor: 'skyblue'}} /> <View style={{flex: 3,

android native code security

由 对着背影说爱祢 提交于 2019-12-22 10:27:56
问题 How does Android perform security checks on native code? Suppose we declare permission X in AndroidManifest.xml, does it mean we inherit that same permission X in our native code? 回答1: How does Android perform security checks? There are basically two ways the permissions are enforced. First of all on kernel level: each installed app is assigned a unique (linux) user id and each time your app is started Android will spawn a process and sets the user id of that process to whatever your app

can android load dll's from sdcard in native mode

由 孤街醉人 提交于 2019-12-22 06:22:33
问题 I want to port a program I wrote to android. The program is in c++ on windows and linux. The program uses dll's for a plugin architecture. New plugins can be added to the program by downloading a dll which the program loads from a specific folder. My question is... Is it possible to download dlls built for android to a directory on the sdcard then from native code load and use those dll's 回答1: I think not, external storage is mounted with option noexec. You can load libraries from app's

Firefox extension: native code execution?

由 ╄→尐↘猪︶ㄣ 提交于 2019-12-22 06:09:26
问题 Is it possible to write an extension that runs native, platform-dependent code? I'm an extension-newbie (what a phrase!) :), can you please point me towards good material on this subject? (good keywords to feed to Google are enough) (I would like to put a GtkMenu in Firefox) Edit: I started checking out the Gecko SDK, and it's a rather big subject, and I'm not sure this is what I want. I'd be happy with a friendly manual (which is not a raw reference, but rather some kind of tutorial on how

What is the actual function of the C# project setting “Allow unsafe code”

由 情到浓时终转凉″ 提交于 2019-12-22 05:51:16
问题 I was wondering if the C# project setting "Allow unsafe code" applies only to unsafe C# code in the project itself, or is it necessary to set this option when linking in a native C++ DLL? What about linking in a managed DLL that itself links to a native DLL? What does this option really do, under the hood? 回答1: It has to do with the "unsafe" keyword in C#. "unsafe" turns off all the checks that would normally happen and allow you to directly access the memory. it doesn't refer to calling

What is the actual function of the C# project setting “Allow unsafe code”

由 白昼怎懂夜的黑 提交于 2019-12-22 05:51:07
问题 I was wondering if the C# project setting "Allow unsafe code" applies only to unsafe C# code in the project itself, or is it necessary to set this option when linking in a native C++ DLL? What about linking in a managed DLL that itself links to a native DLL? What does this option really do, under the hood? 回答1: It has to do with the "unsafe" keyword in C#. "unsafe" turns off all the checks that would normally happen and allow you to directly access the memory. it doesn't refer to calling

Difference between NativeCameraView and JavaCameraView in OpenCV [duplicate]

由 落花浮王杯 提交于 2019-12-22 05:42:30
问题 This question already has answers here : What is the difference between `opencv.android.JavaCameraView` and `opencv.android.NativeCameraView` (2 answers) Closed last year . As in the topic, could someone please explain to me what is the difference using NativeCameraView and JavaCameraView in OpenCV? Currently I am using JavaCameraView to detect fingertips and it is extremely slow. I am wondering if using NativeCameraView would make a change? 回答1: https://groups.google.com/forum/#!msg/android

Is there a best practice for accessing C++ native COM functions to interop from C#?

由 怎甘沉沦 提交于 2019-12-22 00:36:21
问题 Is there a best practice for accessing C++ native COM functions to interop from C#? For example, if I have 100 C++ methods (basically a native library) that interacts with a core window component. I want to basically make a wrapper for these C++ methods in C#, so all my newly hired employees can use that instead of C++, etc. The C++ code is legacy and scares me, so I want to deal with it just once. Is the approach here for each method to have a corresponding C# method? In fact, is there
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