Android工具栏菜单未显示

Question

我正在尝试向ToolBar添加菜单. onCreateOptionsMenu我的方法Activity被调用,但没有菜单出现.

这是dashboard.xml(来自菜单文件夹)

<?xml version="1.0" encoding="utf-8"?>
<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.app.android.ui.dashboard.DashboardActivity">

    <item
        android:id="@+id/action_scan_qr"
        android:icon="@drawable/ic_drawer"
        android:title="@string/menu_scan_qr"
        app:showAsAction="always" />
</menu>

注意:此菜单的图标比操作栏的背景颜色更暗,因此它应该是可见的.

活动中的充气菜单:

public class DashboardActivity extends ActionBarActivity {

@Override
public boolean onCreateOptionsMenu(final Menu menu) {
    getMenuInflater().inflate(R.menu.dashboard, menu);

    return true;
}

以及该应用程序的主题:

<style name="Theme.Application.Base" parent="Theme.AppCompat.Light">
        <item name="colorPrimary">@android:color/white</item>
        <item name="colorPrimaryDark">@android:color/white</item>
        <item name="android:windowNoTitle">true</item>
        <item name="windowActionBar">false</item>
        <item name="drawerArrowStyle">@style/Theme.Application.DrawerArrowStyle</item>
        <item name="android:textColorSecondary">@android:color/darker_gray</item>
</style>

为什么onCreateOptionsMenu被调用但菜单没有出现.我正在使用appcompat-v7:21.0.3

编辑:

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

        toolbar = (Toolbar) findViewById(R.id.tool_bar);
        if (toolbar == null) {
            throw new Error("Can't find tool bar, did you forget to add it in Activity layout file?");
        }

        setSupportActionBar(toolbar);
        getSupportActionBar().setDisplayHomeAsUpEnabled(true);
        getSupportActionBar().setHomeButtonEnabled(true);
    }

Answer 1

我也遇到了同样的问题,但实际的错误是,我忘了在java活动中介绍工具栏

在AppCompactActivity,在创建方法下,通过id和调用定义您的工具栏setSupportActionBar(ToolBar);

示例如下:

public class secondActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_second);

        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);

Answer 2

我不确定为什么,但是当我在onPrepareOptionsMenu方法中放置所有相关的菜单膨胀时,一切正常.

@Override
public boolean onPrepareOptionsMenu(final Menu menu) {
    getMenuInflater().inflate(R.menu.dashboard, menu);

    return super.onCreateOptionsMenu(menu);
}

Answer 3

请尝试以下方法:

<menu xmlns:android="http://schemas.android.com/apk/res/android"
      xmlns:tools="http://schemas.android.com/tools"
      xmlns:app="http://schemas.android.com/apk/res-auto"
      tools:context="com.example.lolipoptest.MainActivity" >

<item
    android:id="@+id/action_settings"
    android:orderInCategory="100"
    android:showAsAction="never"
    android:title="@string/action_settings"/>
</menu>

和Java代码:

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.main, menu);
    return true;
}

Answer 4

您的仪表板布局中是否有工具栏？在您的活动中调用setSupportActionBar(工具栏).使用Theme.AppCompat.NoActionBar主题进行活动(如果您在其中使用工具栏)

import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.support.v7.widget.Toolbar;
import android.view.Menu;

public class DashboardActivity extends ActionBarActivity {

 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
  Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
  setSupportActionBar(toolbar);
  getSupportActionBar().setDisplayHomeAsUpEnabled(true);
  getSupportActionBar().setHomeButtonEnabled(true);
}

@Override
 public boolean onCreateOptionsMenu(Menu menu) {
  getMenuInflater().inflate(R.menu.dashboard, menu);
  return super.onCreateOptionsMenu(menu);
 }

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    int id = item.getItemId();
    if (id == R.id.action_settings) {
        return true;
    }
    return super.onOptionsItemSelected(item);
}
}

检查你的风格.

<resources>

<!-- Base application theme. -->
<style name="AppTheme.Base" parent="Theme.AppCompat.NoActionBar">
    <item name="colorPrimary">@color/colorPrimary</item>
    <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
    <item name="android:windowBackground">@color/white</item>
    <item name="colorAccent">@color/colorAccent</item>
</style>

<style name="AppTheme" parent="AppTheme.Base">

</style>

<style name="ToolbarTheme" parent="AppTheme" >
</style>

<color name="light">#FFBB33</color>
<color name="colorPrimary">#FFBB33</color>
<color name="textColorPrimary">#FFBB33</color>
<color name="colorPrimaryDark">#FF8800</color>
<color name="colorAccent">#ff9977</color>
<color name="white">#ffffff</color>

</resources>

检查你的布局.

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">

<android.support.v7.widget.Toolbar
    android:id="@+id/toolbar"
    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="wrap_content"
    android:minHeight="?attr/actionBarSize"
    app:titleMarginStart="20dp"
    android:paddingRight="10dp"
    android:background="@color/colorPrimaryDark"
    app:theme="@style/ToolbarTheme" />

<TextView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="15dp"
    android:text="Hello Toolbar" />

</LinearLayout>

在清单中的活动中添加主题

android:theme="@style/AppTheme"

Answer 5

如果你是通过重写从膨胀的片段，例如，您的菜单onCreateOptionsMenu的方法，请确保调用setHasOptionsMenu(true)在onCreateView您的片段

Answer 6

您需要在活动的 onCreateOptionsMenu 中扩充您的菜单：

 @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.mymenu, menu);
        return super.onCreateOptionsMenu(menu);
    }