我正在尝试iOS callkit在Android 上实现行为。我收到了来自Firebase的推送通知,并且想向用户显示“来电”屏幕。为此,我使用ConnectionService了android.telecompackage和其他类。
这是我的呼叫管理器类:
class CallManager(context: Context) {
val telecomManager: TelecomManager
var phoneAccountHandle:PhoneAccountHandle
var context:Context
val number = "3924823202"
init {
telecomManager = context.getSystemService(Context.TELECOM_SERVICE) as TelecomManager
this.context = context
val componentName = ComponentName(this.context, CallConnectionService::class.java)
phoneAccountHandle = PhoneAccountHandle(componentName, "Admin")
val phoneAccount = PhoneAccount.builder(phoneAccountHandle, "Admin").setCapabilities(PhoneAccount.CAPABILITY_SELF_MANAGED).build()
telecomManager.registerPhoneAccount(phoneAccount)
val intent = Intent()
intent.component = ComponentName("com.android.server.telecom", "com.android.server.telecom.settings.EnableAccountPreferenceActivity")
intent.flags = Intent.FLAG_ACTIVITY_CLEAR_TOP
}
@TargetApi(Build.VERSION_CODES.M)
fun startOutgoingCall() {
val extras = Bundle()
extras.putBoolean(TelecomManager.EXTRA_START_CALL_WITH_SPEAKERPHONE, true)
val manager = context.getSystemService(TELECOM_SERVICE) as TelecomManager
val phoneAccountHandle …Run Code Online (Sandbox Code Playgroud) 假设我有一个包含私有成员和getter的简单c ++类:
class MyClass
{
private:
double m_testValue = 1;
public:
double& getTestValue(){return m_testValue;}
}
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现在让我们说我想调用getter来获取我的引用并编辑这个值(并在值之前/之后打印)
auto testVal = myClassInstance.getTestValue();
std::cout << myClassInstance.getTestValue() << std::endl;
std::cout << testVal << std::endl;
testVal = 3;
std::cout << myClassInstance.getTestValue() << std::endl;
std::cout << testVal << std::endl;
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输出是
1
1
1
3
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这并不是我所期望的,因为很明显,m_testValue没有被编辑.确实,如果我用double替换auto:
double& testVal = myClassInstance.getTestValue();
std::cout << myClassInstance.getTestValue() << std::endl;
std::cout << testVal << std::endl;
testVal = 3;
std::cout << myClassInstance.getTestValue() << std::endl;
std::cout << testVal << std::endl;
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我明白了
1
1
3 …Run Code Online (Sandbox Code Playgroud) 我正在使用绘图破折号创建一个Web应用程序以进行图形生成和回调处理。我使用破折号核心组件v0.18.1
尝试动态添加图形时(每次单击按钮时,都会添加一个新图形),控制台中会出现错误:
bundle.js?v = 0.11.2:9未捕获(承诺)错误:未找到dash_core_components。在Object.resolve(bundle.js?v = 0.11.2:9)在s(bundle.js?v = 0.11.2:9)在Array.map()在s(bundle.js?v = 0.11.2) :9)在Array.map()在s(bundle.js?v = 0.11.2:9)在Array.map()在s(bundle.js?v = 0.11.2:9)在e.value( bundle.js?v = 0.11.2:9)位于p._renderValidatedComponentWithoutOwnerOrContext(react-dom@15.4.2.min.js?v = 0.11.2:13)
我只有一个空白页面,上面有一个按钮和单击后的回调。回调仅用图形填充div。
布局代码:
class ContentController(object):
graph_names = None
def __init__(self):
self.graph_names = []
# UNCOMMENT THIS LINE TO MAKE IT WORK
# self.graph_names = ["start_graph"]
def layout(self):
return html.Div([html.Button("Add Graph", id='button_id'),
html.Div(self.graphics_layout, id='graphics_div')],
id='main_div')
@property
def graphics_layout(self):
graphs = []
for name in self.graph_names:
graph = self.create_graph()
graphs.append(dcc.Graph(id=name, figure=graph, style= {'width': '600px', 'height': '300px'}))
return graphs
def create_graph(self):
graph_data = …Run Code Online (Sandbox Code Playgroud) 我尝试编写一个小测试来尝试 Espresso。
package com.mycompany.myapp.somemodule
import com.mycompany.myapp.R
import other.uselful.imports
@RunWith(AndroidJUnit4::class)
@LargeTest
class DemoTest {
@get:Rule
var startActivity: ActivityTestRule<StartActivity> = ActivityTestRule(StartActivity::class.java)
@Test
fun aDemoTest() {
onView(withId(R.id.theElementId))
.check(matches(isClickable()))
}
}
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Android Studio 没有显示任何错误。如果我 ctrl+click R.id.theElementID,它会在适当的布局文件中找到它。但是,当我尝试运行时,出现编译错误:
未解析的参考:id
我该如何解决这个问题?
使用Eigen,我有一个Matrix3Xd(3行,n列).我想得到所有列的平方范数
更清楚,让我说我有
Matrix3Xd a =
1 3 2 1
2 1 1 4
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我想得到每列的平方范数
squaredNorms =
5 10 5 17
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我想利用矩阵计算而不是通过for循环自己进行计算.
我的意思是
squaredNorms = (A.transpose() * A).diagonal()
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这有效,但我担心性能问题:A.transpose() * A当我只需要对角线时,它将是一个nxn矩阵(可能是数百万个元素).
Eigen足够聪明,只计算我需要的系数吗?在每列上实现squareNorm计算的最有效方法是什么?
我想在我的应用中显示图像.我使用QtDesigner设计UI,然后使用pyqt进行编码.问题是将显示的图像比UI上的窗口小部件大.我参考官方演示: QT - Widget图像查看器演示
添加imagelabel和scrollArea,代码如下:
---- UI init ----
self.label = QtGui.QLabel(self.centralwidget)
self.label.setGeometry(QtCore.QRect(40, 140, 361, 511))
self.label.setSizePolicy(QtGui.QSizePolicy.Preferred,QtGui.QSizePolicy.Preferred)
self.label.setObjectName(_fromUtf8("label"))
self.scrollArea = QtGui.QScrollArea(self.centralwidget)
self.scrollArea.setGeometry(QtCore.QRect(40, 140, 361, 511))
self.scrollArea.setWidget(self.label)
self.scrollArea.setObjectName(_fromUtf8("scrollArea"))
---- function ----
filename = "./Penguins.jpg"
image = QtGui.QImage(filename)
pp = QtGui.QPixmap.fromImage(image)
lbl = QtGui.QLabel(self.label)
lbl.setPixmap(pp)
self.scrollArea.setWidgetResizable(True)
lbl.show()
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但它不会拉伸图像,即使没有滚动条出现!
Weirdly I haven't been able to find an answer in the doc or on the web although it seems to be a simple question:
Imagine I registered to a c# event in a conditional block:
void Execute()
{
if(loader.AlreadyCompleted)
{
DoSomething();
}
else
{
loader.Completed += DoSomething;
}
}
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In this example, a loader will trigger the Completed event. If it already happended AlreadyCompleted will be true, otherwise it is false and I want to register to the Completed event …
所以我正在制作一个在字符串中使用 int 值的代码(硬编码 btw),它可以工作,但是当我通过单击按钮增加 int 的值时,字符串中的 int 不会随着增量而改变。
int indexOfQuestion= 1;
numberOfQuestion.setText("Question " + indexOfQuestion + " from " + lengthOfQuestion + " :" );
switch(v.getId()):
case R.id.next:
indexOfQuestion = indexOfQuestion+1;
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因此,当我单击按钮时,numberOfQuestion 中的 indexOfQuestion 保持为 1。如何在没有冗长代码的情况下按照我的意图自动更改它?谢谢