Android动态修改ToolBar的Menu菜单示例

android动态修改toolbar的menu菜单

效果图

实现

实现很简单，就是一个具有3个action的menu，在我们滑动到不同状态的时候，把对应的action隐藏了。

开始上货

menu

menu下添加3个item

<menu xmlns:android="http://schemas.android.com/apk/res/android"
  xmlns:app="http://schemas.android.com/apk/res-auto"
  xmlns:tools="http://schemas.android.com/tools"
  tools:context="com.kongqw.myapplication.mainactivity">
  <item
    android:id="@+id/search_button"
    android:icon="@mipmap/navigation_icon_search"
    android:orderincategory="100"
    android:title="搜索"
    app:showasaction="ifroom" />
  <item
    android:id="@+id/scan_button"
    android:icon="@mipmap/navigation_icon_sweep"
    android:orderincategory="100"
    android:title="扫描"
    app:showasaction="ifroom" />

  <item
    android:id="@+id/setting_button"
    android:icon="@mipmap/titlebar_icon_settings_normal"
    android:orderincategory="100"
    android:title="设置"
    app:showasaction="ifroom" />
</menu>

重写onprepareoptionsmenu方法

用来根据viewpager显示页面控制menu显示的item

demo里我用的是viewpager滑动来控制，可以根据自己需求，不过大多数都是判断viewpager吧。

@override
public boolean onprepareoptionsmenu(menu menu) {
  // 动态设置toolbar状态
  switch (mviewpager.getcurrentitem()) {
    case 0:
      menu.finditem(r.id.search_button).setvisible(true);
      menu.finditem(r.id.scan_button).setvisible(true);
      menu.finditem(r.id.setting_button).setvisible(false);
      break;
    case 1:
      menu.finditem(r.id.search_button).setvisible(false);
      menu.finditem(r.id.scan_button).setvisible(false);
      menu.finditem(r.id.setting_button).setvisible(false);
      break;
    case 2:
      menu.finditem(r.id.search_button).setvisible(false);
      menu.finditem(r.id.scan_button).setvisible(false);
      menu.finditem(r.id.setting_button).setvisible(true);
      break;
  }
  return super.onprepareoptionsmenu(menu);
}

item点击

@override
public boolean onoptionsitemselected(menuitem item) {
  int id = item.getitemid();
  if (id == r.id.search_button) {
    toast.maketext(getapplicationcontext(), "搜索", toast.length_short).show();
    return true;
  } else if (id == r.id.scan_button) {
    toast.maketext(getapplicationcontext(), "扫描", toast.length_short).show();
    return true;
  } else if (id == r.id.setting_button) {
    toast.maketext(getapplicationcontext(), "设置", toast.length_short).show();
    return true;
  }
  return super.onoptionsitemselected(item);
}

监听viewpager滑动，改变menu状态（重点）

调用invalidateoptionsmenu();方法从新加载menu，即回调onprepareoptionsmenu方法

mviewpager.addonpagechangelistener(new viewpager.onpagechangelistener() {
  @override
  public void onpagescrolled(int position, float positionoffset, int positionoffsetpixels) {

  }

  @override
  public void onpageselected(int position) {
    // getwindow().invalidatepanelmenu(window.feature_options_panel);
    invalidateoptionsmenu();
  }

  @override
  public void onpagescrollstatechanged(int state) {

  }
});

code（参考）

就是android studio默认创建的带有viewpager的demo，

package com.kongqw.myapplication;

import android.support.v7.app.appcompatactivity;
import android.support.v7.widget.toolbar;

import android.support.v4.app.fragment;
import android.support.v4.app.fragmentmanager;
import android.support.v4.app.fragmentpageradapter;
import android.support.v4.view.viewpager;
import android.os.bundle;
import android.view.layoutinflater;
import android.view.menu;
import android.view.menuitem;
import android.view.view;
import android.view.viewgroup;

import android.view.window;
import android.widget.textview;
import android.widget.toast;

public class mainactivity extends appcompatactivity {

  private sectionspageradapter msectionspageradapter;

  private viewpager mviewpager;

  @override
  protected void oncreate(bundle savedinstancestate) {
    super.oncreate(savedinstancestate);
    setcontentview(r.layout.activity_main);

    toolbar toolbar = (toolbar) findviewbyid(r.id.toolbar);
    setsupportactionbar(toolbar);

    msectionspageradapter = new sectionspageradapter(getsupportfragmentmanager());

    mviewpager = (viewpager) findviewbyid(r.id.container);
    mviewpager.setadapter(msectionspageradapter);

    mviewpager.addonpagechangelistener(new viewpager.onpagechangelistener() {
      @override
      public void onpagescrolled(int position, float positionoffset, int positionoffsetpixels) {

      }

      @override
      public void onpageselected(int position) {
        // getwindow().invalidatepanelmenu(window.feature_options_panel);
        invalidateoptionsmenu();
      }

      @override
      public void onpagescrollstatechanged(int state) {

      }
    });
  }


  @override
  public boolean oncreateoptionsmenu(menu menu) {
    getmenuinflater().inflate(r.menu.menu_main, menu);
    return true;
  }

  @override
  public boolean onprepareoptionsmenu(menu menu) {
    // 动态设置toolbar状态
    switch (mviewpager.getcurrentitem()) {
      case 0:
        menu.finditem(r.id.search_button).setvisible(true);
        menu.finditem(r.id.scan_button).setvisible(true);
        menu.finditem(r.id.setting_button).setvisible(false);
        break;
      case 1:
        menu.finditem(r.id.search_button).setvisible(false);
        menu.finditem(r.id.scan_button).setvisible(false);
        menu.finditem(r.id.setting_button).setvisible(false);
        break;
      case 2:
        menu.finditem(r.id.search_button).setvisible(false);
        menu.finditem(r.id.scan_button).setvisible(false);
        menu.finditem(r.id.setting_button).setvisible(true);
        break;
    }
    return super.onprepareoptionsmenu(menu);
  }

  @override
  public boolean onoptionsitemselected(menuitem item) {
    int id = item.getitemid();
    if (id == r.id.search_button) {
      toast.maketext(getapplicationcontext(), "搜索", toast.length_short).show();
      return true;
    } else if (id == r.id.scan_button) {
      toast.maketext(getapplicationcontext(), "扫描", toast.length_short).show();
      return true;
    } else if (id == r.id.setting_button) {
      toast.maketext(getapplicationcontext(), "设置", toast.length_short).show();
      return true;
    }
    return super.onoptionsitemselected(item);
  }

  public static class placeholderfragment extends fragment {
    private static final string arg_section_number = "section_number";

    public placeholderfragment() {
    }

    public static placeholderfragment newinstance(int sectionnumber) {
      placeholderfragment fragment = new placeholderfragment();
      bundle args = new bundle();
      args.putint(arg_section_number, sectionnumber);
      fragment.setarguments(args);
      return fragment;
    }

    @override
    public view oncreateview(layoutinflater inflater, viewgroup container, bundle savedinstancestate) {
      view rootview = inflater.inflate(r.layout.fragment_main, container, false);
      textview textview = (textview) rootview.findviewbyid(r.id.section_label);
      textview.settext(getstring(r.string.section_format, getarguments().getint(arg_section_number)));
      return rootview;
    }
  }

  public class sectionspageradapter extends fragmentpageradapter {

    public sectionspageradapter(fragmentmanager fm) {
      super(fm);
    }

    @override
    public fragment getitem(int position) {
      return placeholderfragment.newinstance(position + 1);
    }

    @override
    public int getcount() {
      return 3;
    }

    @override
    public charsequence getpagetitle(int position) {
      switch (position) {
        case 0:
          return "section 1";
        case 1:
          return "section 2";
        case 2:
          return "section 3";
      }
      return null;
    }
  }
}

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