Android Studio，选项菜单仅在 Main 中打开 Activity

Question

我现在在尝试打开除主 activity 之外的任何 activity 中的下拉菜单时遇到问题。我可以在 MainActivity 中单击以打开菜单的右上角的三个点仍然显示在 PieChartActivity 中，但是单击它们没有任何作用。

**编辑：请务必注意，我使用第一个 activity 中的下拉菜单导航到第二个 activity。然后在那一秒 activity，点击角落里的三个点不会打开那个 activity 的菜单。

这是我的代码：

在 MainActivity 中：

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

@Override
public boolean onOptionsItemSelected(@NonNull MenuItem item) {
    int id = item.getItemId();
    switch(id){
        case R.id.log_save_log:
            Toast.makeText(getApplicationContext(), "SAVE LOG", Toast.LENGTH_SHORT).show();
            break;
        case R.id.log_add_new_metric:
            Toast.makeText(getApplicationContext(), "ADD METRIC", Toast.LENGTH_SHORT).show();
            break;
        case R.id.log_about_app:
            Toast.makeText(getApplicationContext(), "ABOUT APP", Toast.LENGTH_SHORT).show();
            break;
        case R.id.log_user_settings:
            Toast.makeText(getApplicationContext(), "USER SETTINGS", Toast.LENGTH_SHORT).show();
            break;
        case R.id.log_log_mode:
            startActivity(new Intent(getApplicationContext(), MainActivity.class));
            Toast.makeText(getApplicationContext(), "LOG MODE", Toast.LENGTH_SHORT).show();
            break;
        case R.id.log_log_settings:
            Toast.makeText(getApplicationContext(), "LOG SETTINGS", Toast.LENGTH_SHORT).show();
            break;
        case R.id.log_pie_mode:
            startActivity(new Intent(getApplicationContext(), PieChartActivity.class));
            Toast.makeText(getApplicationContext(), "PIE CHART", Toast.LENGTH_SHORT).show();
            break;
        case R.id.log_pie_settings:
            Toast.makeText(getApplicationContext(), "PIE CHART SETTINGS", Toast.LENGTH_SHORT).show();
            break;
        case R.id.log_radar_mode:
            startActivity(new Intent(getApplicationContext(), RadarChartActivity.class));
            Toast.makeText(getApplicationContext(), "RADAR CHART", Toast.LENGTH_SHORT).show();
            break;
        case R.id.log_radar_settings:
            Toast.makeText(getApplicationContext(), "RADAR CHART SETTINGS", Toast.LENGTH_SHORT).show();
            break;
        case R.id.log_bar_mode:
            startActivity(new Intent(getApplicationContext(), BarChartActivity.class));
            Toast.makeText(getApplicationContext(), "BAR CHART", Toast.LENGTH_SHORT).show();
            break;
        case R.id.log_bar_settings:
            Toast.makeText(getApplicationContext(), "BAR CHART SETTINGS", Toast.LENGTH_SHORT).show();
            break;
        default:
            break;
    }
    return true;
}

在log_header_menu中：

<?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">

<item
    android:title="About This App"
    android:id="@+id/log_about_app"
    app:showAsAction="never"/>

<item
    android:title="User Settings"
    android:id="@+id/log_user_settings"
    app:showAsAction="never"/>

<item
    android:title="Log"
    android:id="@+id/log_log_menu"
    app:showAsAction="never">

    <menu>
        <item
            android:title="View Log"
            android:id="@+id/log_log_mode"/>
        <item
            android:title="Log Settings"
            android:id="@+id/log_log_settings"/>
    </menu>

</item>

<item
    android:title="Pie Chart"
    android:id="@+id/log_pie_menu"
    app:showAsAction="never">

    <menu>
        <item
            android:title="View Pie Chart"
            android:id="@+id/log_pie_mode"/>
        <item
            android:title="Pie Chart Settings"
            android:id="@+id/log_pie_settings"/>
    </menu>

</item>

<item
    android:title="Radar Chart"
    android:id="@+id/log_radar_menu"
    app:showAsAction="never">

    <menu>
        <item
            android:title="View Radar Chart"
            android:id="@+id/log_radar_mode"/>
        <item
            android:title="Radar Chart Settings"
            android:id="@+id/log_radar_settings"/>
    </menu>

</item>

<item
    android:title="Bar Chart"
    android:id="@+id/log_bar_menu"
    app:showAsAction="never">

    <menu>
        <item
            android:title="View Bar Chart"
            android:id="@+id/log_bar_mode"/>
        <item
            android:title="Bar Chart Settings"
            android:id="@+id/log_bar_settings"/>
    </menu>

</item>

<item
    android:title="Save Log"
    android:id="@+id/log_save_log"
    android:icon="@drawable/ic_over_write"
    app:showAsAction="always"/>

<item
    android:title="Add Metric"
    android:id="@+id/log_add_new_metric"
    android:icon="@drawable/ic_add_new"
    app:showAsAction="always"/>

</menu>

在 PieChartActivity 中：

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

@Override
public boolean onOptionsItemSelected(@NonNull MenuItem item) {
    int id = item.getItemId();
    switch(id){
        case R.id.pie_about_app:
            Toast.makeText(getApplicationContext(), "ABOUT APP", Toast.LENGTH_SHORT).show();
            break;
        case R.id.pie_user_settings:
            Toast.makeText(getApplicationContext(), "USER SETTINGS", Toast.LENGTH_SHORT).show();
            break;
        case R.id.pie_log_mode:
            startActivity(new Intent(getApplicationContext(), MainActivity.class));
            Toast.makeText(getApplicationContext(), "LOG MODE", Toast.LENGTH_SHORT).show();
            break;
        case R.id.pie_log_settings:
            Toast.makeText(getApplicationContext(), "LOG SETTINGS", Toast.LENGTH_SHORT).show();
            break;
        case R.id.pie_pie_mode:
            startActivity(new Intent(getApplicationContext(), PieChartActivity.class));
            Toast.makeText(getApplicationContext(), "PIE CHART", Toast.LENGTH_SHORT).show();
            break;
        case R.id.pie_pie_settings:
            Toast.makeText(getApplicationContext(), "PIE CHART SETTINGS", Toast.LENGTH_SHORT).show();
            break;
        case R.id.pie_radar_mode:
            startActivity(new Intent(getApplicationContext(), RadarChartActivity.class));
            Toast.makeText(getApplicationContext(), "RADAR CHART", Toast.LENGTH_SHORT).show();
            break;
        case R.id.pie_radar_settings:
            Toast.makeText(getApplicationContext(), "RADAR CHART SETTINGS", Toast.LENGTH_SHORT).show();
            break;
        case R.id.pie_bar_mode:
            startActivity(new Intent(getApplicationContext(), BarChartActivity.class));
            Toast.makeText(getApplicationContext(), "BAR CHART", Toast.LENGTH_SHORT).show();
            break;
        case R.id.pie_bar_settings:
            Toast.makeText(getApplicationContext(), "BAR CHART SETTINGS", Toast.LENGTH_SHORT).show();
            break;
        default:
            break;
    }
    return true;
}

在pie_header_menu中：

<?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">

<item
    android:title="About This App"
    android:id="@+id/pie_about_app"
    app:showAsAction="never"/>

<item
    android:title="User Settings"
    android:id="@+id/pie_user_settings"
    app:showAsAction="never"/>

<item
    android:title="Log"
    android:id="@+id/pie_log_menu"
    app:showAsAction="never">

    <menu>
        <item
            android:title="View Log"
            android:id="@+id/pie_log_mode"/>
        <item
            android:title="Log Settings"
            android:id="@+id/pie_log_settings"/>
    </menu>

</item>

<item
    android:title="Pie Chart"
    android:id="@+id/pie_pie_menu"
    app:showAsAction="never">

    <menu>
        <item
            android:title="View Pie Chart"
            android:id="@+id/pie_pie_mode"/>
        <item
            android:title="Pie Chart Settings"
            android:id="@+id/pie_pie_settings"/>
    </menu>

</item>

<item
    android:title="Radar Chart"
    android:id="@+id/pie_radar_menu"
    app:showAsAction="never">

    <menu>
        <item
            android:title="View Radar Chart"
            android:id="@+id/pie_radar_mode"/>
        <item
            android:title="Radar Chart Settings"
            android:id="@+id/pie_radar_settings"/>
    </menu>

</item>

<item
    android:title="Bar Chart"
    android:id="@+id/pie_bar_menu"
    app:showAsAction="never">

    <menu>
        <item
            android:title="View Bar Chart"
            android:id="@+id/pie_bar_mode"/>
        <item
            android:title="Bar Chart Settings"
            android:id="@+id/pie_bar_settings"/>
    </menu>

</item>

</menu>

Answer 1

只需在 onCreateOptionsMenu() 中为两个活动扩充相同的菜单

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    getMenuInflater().inflate(***same menu id here***, menu);
    return true;
}

Answer 2

在您的 MainActivity 中，您正在扩充 log_header_menu 菜单并使用开关打开未在菜单 xml 文件中定义的项目 ID（R.id.log_save_log，R.id.log_add_new_metric、R.id.log_about_app、...)，这就是为什么 item.getItemId() returns 与 R.id.xyz 不同的 int，因此当您单击任何项目时没有任何反应，重构您的开关以使用log_header_menu 菜单 xml 文件中定义的 ID（bar_about_app、bar_user_settings、bar_log_menu、...）

Answer 3

已解决！对于遇到同样问题的任何人，这是我遇到的问题：

次要活动的布局有问题。每个都有一个包含菜单按钮的 header，但是 header 位于布局中另一个元素的透明部分下方，使菜单按钮无法访问。我将布局从约束布局更改为垂直方向的线性布局，这样包含每个次要 activity 主要组件的布局元素将固定在 header 的底部而不是与其重叠。

谢谢大家的回复！

Android Studio，选项菜单仅在 Main 中打开 Activity

Android Studio, options menu only opens in Main Activity

java

android

android-studio

android-activity

android-menu