如何使用Java代码添加导航视图 [英] how to add the Navigation View using Java Code

问题描述

我正在使用androidx进行开发，并且尝试使用NavigationView，并且由于findViewById通常在您需要时不起作用，因此我尝试使用Java代码进行所有操作.所以，我试图让这个NavigationView出现，但这似乎缺少了一些东西:

I'm using androidx for development and I'm trying to use the NavigationView and since the findViewById doesn't usually work when you need it to, I'm trying to do everything in Java Code. So, I'm trying to get this NavigationView to appear, but this seems to be missing something:

public class MainActivity extends AppCompatActivity {

Activity_Animation001_Layout animation001_layout;
Animation_Activity002 animLay2;



@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);


    DrawerLayout mDrawer = new DrawerLayout(this);
    mDrawer.setLayoutParams(new DrawerLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT));

    LinearLayout mLinearLayout = new LinearLayout(this);
    mLinearLayout.setLayoutParams(new LinearLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT));
    mLinearLayout.setOrientation(LinearLayout.HORIZONTAL);
    TextView mTextView = new TextView(this);
    mTextView.setLayoutParams(new LinearLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT));
    mTextView.setText("something");
    mTextView.setTextSize(30);
    mLinearLayout.addView(mTextView);



    NavigationView mNavView = new NavigationView(this);
    NavigationView.LayoutParams mNavLayParam = new NavigationView.LayoutParams(250, ViewGroup.LayoutParams.MATCH_PARENT);
    mNavLayParam.gravity= Gravity.RIGHT;
    mNavView.setLayoutParams(mNavLayParam);


    mDrawer.addView(mLinearLayout);
    mDrawer.addView(mNavView);

    //        animLay2 = new Animation_Activity002(this);
    setContentView(mDrawer);

}

似乎出现了Drawer，LinearLayout和TextView，但是当我从屏幕的右边缘向左滑动时，使NavigationView出现.我们应该如何添加和实例化Views(在本例中为NavigationView)?

The Drawer, LinearLayout and TextView seem to be appearing, but I make the NavigationView to appear when I swipe left from the right edge of the screen. How should we add and instantiate Views(or the NavigationView in this case)?

推荐答案

您几乎在正确的路径上，需要将mNavView重力更改为Gravity.START，并对NavigationView使用DrawerLayout.LayoutParams，

You are almost in the right path, you need to change the mNavView gravity to the Gravity.START, and use DrawerLayout.LayoutParams for the NavigationView,

此外，您还需要将NavigationView从dp转换为像素，然后再将其设置为Layout参数.

Also you need to convert the NavigationView from dp to pixel before setting it as a Layout parameter.

以下是用于以编程方式创建DrawerLayout和NavigationView的完整功能示例

Below is a full functional example for creating DrawerLayout and NavigationView programmatically

注意:我没有创建NavigationView布局标题&通过编程菜单使事情变得更简单.

Note: I didn't create the NavigationView layout header & menu programmatically to keep things simpler.

行为

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        // Building Main layout
        LinearLayout mainLayout = new LinearLayout(this);
        mainLayout.setGravity(Gravity.CENTER);
        mainLayout.setOrientation(LinearLayout.HORIZONTAL);
        TextView textView = new TextView(this);
        textView.setText("Some text In Main Layout");
        textView.setTextSize(30);

        mainLayout.addView(textView);
        mainLayout.setLayoutParams(new LinearLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT));

        // Building NavigationView layout
        NavigationView navView = new NavigationView(this);
        DrawerLayout.LayoutParams navParams = new DrawerLayout.LayoutParams(
                convertDpToPx(250), LinearLayout.LayoutParams.MATCH_PARENT);
        navParams.gravity = Gravity.START;
        navView.setLayoutParams(navParams);

        // Navigation View header
        View child = getLayoutInflater().inflate(R.layout.nav_header_layout, null);
        navView.addHeaderView(child);

        // Navigation View menu
        navView.inflateMenu(R.menu.nav_menu);

        // Building DrawerLayout
        DrawerLayout drawerLayout = new DrawerLayout(this);

        // adding main layout to the DrawerLayout
        drawerLayout.addView(mainLayout);
        // adding NavigationView to the DrawerLayout
        drawerLayout.addView(navView);

        // Set activity layout to the DrawerLayout
        setContentView(drawerLayout);
    }

    /**
     * Convert from dp to Pixels
     */
    private int convertDpToPx(int dp) {
        return Math.round(dp * (getResources().getDisplayMetrics().xdpi / DisplayMetrics.DENSITY_DEFAULT));
    }

}

布局

NavigationView标头布局(nav_header_layout.xml)

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="180dp"
    android:background="@color/colorPrimary"
    android:gravity="bottom"
    android:orientation="vertical"
    android:paddingLeft="16dp"
    android:paddingTop="16dp"
    android:paddingRight="16dp"
    android:paddingBottom="16dp"
    android:theme="@style/ThemeOverlay.AppCompat.Dark">

    <ImageView
        android:id="@+id/imageView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:paddingTop="8dp"
        app:srcCompat="@mipmap/ic_launcher_round" />

    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:paddingTop="8dp"
        android:text="Header Title"
        android:textAppearance="@style/TextAppearance.AppCompat.Body1" />

    <TextView
        android:id="@+id/textView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Header Subtitle" />

</LinearLayout>

NavigationView菜单(nav_menu.xml)

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    tools:showIn="navigation_view">

    <group android:checkableBehavior="single">
        <item
            android:id="@+id/nav_home"
            android:icon="@drawable/ic_menu_camera"
            android:title="Home" />
        <item
            android:id="@+id/nav_gallery"
            android:icon="@drawable/ic_menu_gallery"
            android:title="Gallery" />
        <item
            android:id="@+id/nav_slideshow"
            android:icon="@drawable/ic_menu_slideshow"
            android:title="Slideshow" />
    </group>
</menu>

这是一个演示

希望对您有帮助

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