工具栏上的间隔均匀的菜单项

Question

所以我一直在尝试android.support.v7.widget.Toolbar在我的Activity中实现它,使它看起来类似于以前支持的拆分ActionBar.

这是我的工具栏的XML:

<android.support.v7.widget.Toolbar
    android:id="@+id/toolbar_btm"
    android:layout_height="wrap_content"
    android:layout_width="match_parent"
    android:minHeight="?attr/actionBarSize"
    android:background="@color/toolbar_bkgnd"
    android:layout_alignParentBottom="true"
    app:theme="@style/ToolBarTheme" />

这是我正在使用的工具栏的样式:

<style name="ToolBarTheme" parent="Theme.AppCompat">
    <item name="actionButtonStyle">@style/ActionButtonStyle</item>
    <item name="android:actionButtonStyle">@style/ActionButtonStyle</item>
    <item name="android:textColor">@android:color/white</item>
</style>

工具栏菜单按钮的样式,我的初步计划是minWidth根据屏幕大小计算,然后为每个菜单按钮设置它.

<style name="ActionButtonStyle" parent="@android:style/Widget.Holo.Light.ActionButton">
    <item name="android:minWidth">56dip</item>
    <item name="android:paddingLeft">0dip</item>
    <item name="android:paddingRight">0dip</item>
</style>

最后,这是我在活动中所说的.

Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar_btm);
toolbarBtm.inflateMenu(R.id.menu);

问题是底部的菜单项Toolbar是这样右对齐的:

但是我希望它们像这样均匀分布:

Answer 1

这对我有用*:

EnhancedMenuInflater.java

import android.support.v4.internal.view.SupportMenuItem;
import android.support.v7.internal.view.menu.MenuItemImpl;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;

import here.is.your.R;

public class EnhancedMenuInflater {

    public static void inflate(MenuInflater inflater, Menu menu, boolean forceVisible) {
        inflater.inflate(R.menu.menu, menu);

        if (!forceVisible) {
            return;
        }

        int size = menu.size();
        for (int i = 0; i < size; i++) {
            MenuItem item = menu.getItem(i);
            // check if app:showAsAction = "ifRoom"
            if (((MenuItemImpl) item).requestsActionButton()) {
                item.setShowAsAction(SupportMenuItem.SHOW_AS_ACTION_ALWAYS);
            }
        }
    }
}

MainActivity.java

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    if (toolbar == null) {
        EnhancedMenuInflater.inflate(getMenuInflater(), menu, false);
    }
    return super.onCreateOptionsMenu(menu);
}

// somewhere after views have been set.
if (toolbar != null) {
    EnhancedMenuInflater.inflate(getMenuInflater(), toolbar.getMenu(), true);
    toolbar.setOnMenuItemClickListener(new Toolbar.OnMenuItemClickListener() {
        @Override
        public boolean onMenuItemClick(MenuItem item) {
            return onOptionsItemSelected(item);
        }
    });
}

SplitToolbar.java

import android.content.Context;
import android.support.v7.widget.ActionMenuView;
import android.support.v7.widget.Toolbar;
import android.util.AttributeSet;
import android.view.View;
import android.view.ViewGroup;

public class SplitToolbar extends Toolbar {
    public SplitToolbar(Context context) {
        super(context);
    }

    public SplitToolbar(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    public SplitToolbar(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
    }

    @Override
    public void addView(View child, ViewGroup.LayoutParams params) {
        if (child instanceof ActionMenuView) {
            params.width = LayoutParams.MATCH_PARENT;
        }
        super.addView(child, params);
    }
}

Layout.xml

<here.is.my.SplitToolbar
    android:id="@+id/toolbar"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_alignParentBottom="true"/>

当我说工作时,我的意思是它在我的菜单,文本和图像中都集中了一切.如果您只使用菜单图标,那么它看起来会很棒.我仍然在寻找一种方法来使它们居中,并将文本放在图标旁边.

Answer 2

UPDATE

Google现在具有非常类似的功能,使用新的Widget调用BottomNavigationView夸大菜单膨胀的正常方式

- 原始答案 -

伙计们花了我一些时间来弄清楚,在这里你会进行一些繁重的操作,但它确实有效.

我用这个Toolbar来显示屏幕底部像旧的SplitActionBar...

在工具栏上显示均匀分布的MenuItem

我不建议使用超过5或6个项目,它可能会有点拥挤......

/**
 * This method will take however many items you have in your  
 * menu/menu_main.xml and distribute them across your devices screen
 * evenly using a Toolbar. Enjoy!!
 */
public void setupEvenlyDistributedToolbar(){
    // Use Display metrics to get Screen Dimensions
    Display display = getWindowManager().getDefaultDisplay();
    DisplayMetrics metrics = new DisplayMetrics();
    display.getMetrics(metrics);

    // Toolbar
    mToolbar = (Toolbar) findViewById(R.id.navigationToolbar);
    // Inflate your menu
    mToolbar.inflateMenu(R.menu.menu_bottom);

    // Add 10 spacing on either side of the toolbar
    mToolbar.setContentInsetsAbsolute(10, 10);

    // Get the ChildCount of your Toolbar, this should only be 1
    int childCount = mToolbar.getChildCount();
    // Get the Screen Width in pixels
    int screenWidth = metrics.widthPixels;

    // Create the Toolbar Params based on the screenWidth
    Toolbar.LayoutParams toolbarParams = new Toolbar.LayoutParams(screenWidth, LayoutParams.WRAP_CONTENT);

    // Loop through the child Items
    for(int i = 0; i < childCount; i++){
        // Get the item at the current index
        View childView = mToolbar.getChildAt(i);
        // If its a ViewGroup
        if(childView instanceof ViewGroup){
            // Set its layout params
            childView.setLayoutParams(toolbarParams);
            // Get the child count of this view group, and compute the item widths based on this count & screen size
            int innerChildCount = ((ViewGroup) childView).getChildCount();
            int itemWidth  = (screenWidth / innerChildCount);               
            // Create layout params for the ActionMenuView
            ActionMenuView.LayoutParams params = new ActionMenuView.LayoutParams(itemWidth, LayoutParams.WRAP_CONTENT);
            // Loop through the children
            for(int j = 0; j < innerChildCount; j++){
                View grandChild = ((ViewGroup) childView).getChildAt(j);
                if(grandChild instanceof ActionMenuItemView){
                    // set the layout parameters on each View
                    grandChild.setLayoutParams(params);
                }
            }
        }
    }
}