rightMenu <ImageView>: `app:tint` attribute should be used on `ImageView` and `ImageButton`

The `app:tint` attribute is used to set the tint color of an `ImageView` or `ImageButton`. It is recommended to use this attribute only on these two types of views, as it may not have any effect on other types of views.

If you try to use the `app:tint` attribute on a view that does not support it, you may get a lint warning stating that the attribute should only be used on `ImageView` or `ImageButton` views.

To fix this warning, you can either remove the `app:tint` attribute from the view, or change the view to an `ImageView` or `ImageButton` if it makes sense for your use case.

相关问题

Android studio DrawerLayout布局使用

以下是使用Android Studio中的DrawerLayout布局的步骤：

1.在XML布局文件中添加DrawerLayout布局，将主要内容放在其中。例如：

<androidx.drawerlayout.widget.DrawerLayout
    android:id="@+id/drawer_layout"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <!-- 主要内容 -->
    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent">

        <!-- 在这里添加你的主要内容 -->

    </RelativeLayout>

    <!-- 左侧菜单 -->
    <LinearLayout
        android:id="@+id/left_menu"
        android:layout_width="240dp"
        android:layout_height="match_parent"
        android:layout_gravity="start"
        android:background="#ffffff"
        android:orientation="vertical">

        <!-- 在这里添加你的左侧菜单 -->

    </LinearLayout>

    <!-- 右侧菜单 -->
    <LinearLayout
        android:id="@+id/right_menu"
        android:layout_width="240dp"
        android:layout_height="match_parent"
        android:layout_gravity="end"
        android:background="#ffffff"
        android:orientation="vertical">

        <!-- 在这里添加你的右侧菜单 -->

    </LinearLayout>

</androidx.drawerlayout.widget.DrawerLayout>

2.在Java代码中设置DrawerLayout的开关按钮。例如：

// 找到左侧菜单按钮并设置点击事件
findViewById(R.id.leftmenu).setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        mDrawerLayout.openDrawer(Gravity.LEFT);
    }
});

// 找到右侧菜单按钮并设置点击事件
findViewById(R.id.rightmenu).setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        mDrawerLayout.openDrawer(Gravity.RIGHT);
    }
});

3.在Java代码中设置DrawerLayout的监听器，以便在打开或关闭菜单时执行相应的操作。例如：

mDrawerLayout.addDrawerListener(new DrawerLayout.DrawerListener() {
    @Override
    public void onDrawerSlide(@NonNull View drawerView, float slideOffset) {
        // 当菜单滑动时执行的操作
    }

    @Override
    public void onDrawerOpened(@NonNull View drawerView) {
        // 当菜单打开时执行的操作
    }

    @Override
    public void onDrawerClosed(@NonNull View drawerView) {
        // 当菜单关闭时执行的操作
    }

    @Override
    public void onDrawerStateChanged(int newState) {
        // 当菜单状态改变时执行的操作
    }
});

生成一个点击鼠标右键出现子对话框，点击鼠标左键没反应的m语言程序

可以使用以下 MFC 代码实现：

// 右键菜单对话框
class CRightMenuDlg : public CDialogEx
{
public:
    CRightMenuDlg(CWnd* pParent = nullptr);

    enum { IDD = IDD_RIGHTMENU_DIALOG };

protected:
    virtual void DoDataExchange(CDataExchange* pDX);

protected:
    HICON m_hIcon;

    afx_msg void OnPaint();
    afx_msg HCURSOR OnQueryDragIcon();
    afx_msg void OnRButtonDown(UINT nFlags, CPoint point);

    DECLARE_MESSAGE_MAP()
};

CRightMenuDlg::CRightMenuDlg(CWnd* pParent /*=nullptr*/)
    : CDialogEx(IDD_RIGHTMENU_DIALOG, pParent)
{
    m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
}

void CRightMenuDlg::DoDataExchange(CDataExchange* pDX)
{
    CDialogEx::DoDataExchange(pDX);
}

BEGIN_MESSAGE_MAP(CRightMenuDlg, CDialogEx)
    ON_WM_PAINT()
    ON_WM_QUERYDRAGICON()
    ON_WM_RBUTTONDOWN()
END_MESSAGE_MAP()

void CRightMenuDlg::OnPaint()
{
    if (IsIconic())
    {
        CPaintDC dc(this); // 绘制设备上下文

        SendMessage(WM_ICONERASEBKGND, reinterpret_cast<WPARAM>(dc.GetSafeHdc()), 0);

        // 中心图标
        int cxIcon = GetSystemMetrics(SM_CXICON);
        int cyIcon = GetSystemMetrics(SM_CYICON);
        CRect rect;
        GetClientRect(&rect);
        int x = (rect.Width() - cxIcon + 1) / 2;
        int y = (rect.Height() - cyIcon + 1) / 2;

        dc.DrawIcon(x, y, m_hIcon);
    }
    else
    {
        CDialogEx::OnPaint();
    }
}

HCURSOR CRightMenuDlg::OnQueryDragIcon()
{
    return static_cast<HCURSOR>(m_hIcon);
}

void CRightMenuDlg::OnRButtonDown(UINT nFlags, CPoint point)
{
    CMenu menu;
    menu.CreatePopupMenu();
    menu.AppendMenu(MF_STRING, 1, _T("子对话框"));

    menu.TrackPopupMenu(TPM_LEFTALIGN | TPM_RIGHTBUTTON, point.x, point.y, this);

    CDialogEx::OnRButtonDown(nFlags, point);
}

// 主程序
class CRightMenuApp : public CWinApp
{
public:
    CRightMenuApp();

public:
    virtual BOOL InitInstance();

    DECLARE_MESSAGE_MAP()
};

CRightMenuApp::CRightMenuApp()
{
}

CRightMenuApp theApp;

BOOL CRightMenuApp::InitInstance()
{
    CWinApp::InitInstance();

    AfxEnableControlContainer();

    CRightMenuDlg dlg;
    m_pMainWnd = &dlg;
    dlg.DoModal();

    return FALSE;
}

这个程序创建了一个 MFC 对话框窗口，当用户在窗口上点击鼠标右键时，会弹出一个子对话框。而当用户点击鼠标左键时，没有任何反应。