1

我刚刚在我的活动中添加了一个菜单。此外，我想为每个菜单项设置一些图标。因此，我尝试了这两种方法，但在设备上看不到这些图标。我究竟做错了什么 ？

我尝试了 XML 方式：

<menu xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:id="@+id/help"
    android:icon="@drawable/help"
    android:title="@string/menu_help" />
    <item android:id="@+id/settings"
    android:icon="@drawable/settings"
    android:title="@string/menu_settings" />
    <item android:id="@+id/num"
    android:icon="@drawable/num_icon"
    android:title="@string/menu_num" />
</menu>

方法2：在我的代码中：

public boolean onCreateOptionsMenu(Menu menu) {
        MenuInflater inflater = getMenuInflater();
        inflater.inflate(R.menu.menu, menu);
        //Set icon for the menu button
        Drawable num_icon = getResources().getDrawable(R.drawable.num_icon);
        menu.getItem(2).setIcon(num_icon);
        Drawable settings_icon = getResources().getDrawable(R.drawable.settings);
        menu.getItem(1).setIcon(settings_icon);
        Drawable help_icon = getResources().getDrawable(R.drawable.help);
        menu.getItem(0).setIcon(help_icon);
        return true;

另外，谁能告诉我这些图标大小应该有多大？我的是 256x256 像素。谢谢

4

3 回答 3

1

在 android sdk 菜单中，图标的大小如下：

ldpi 32 x 32 px
mdpi: 36 x 36 px
hdpi: 48 x 48 px
xhdpi: 64 x 64 px

256x256 太大。

于 2013-07-16T10:08:20.257 回答
1

使用下面的代码它可以帮助你.. menu.xml

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android">
    <!-- Single menu item 
         Set id, icon and Title for each menu item
    -->
    <item android:id="@+id/menu_bookmark"
          android:icon="@drawable/icon_bookmark"
          android:title="Bookmark" />

    <item android:id="@+id/menu_save"
          android:icon="@drawable/icon_save"
          android:title="Save" />

    <item android:id="@+id/menu_search"
          android:icon="@drawable/icon_search"
          android:title="Search" />

    <item android:id="@+id/menu_share"
          android:icon="@drawable/icon_share"
          android:title="Share" />

    <item android:id="@+id/menu_delete"
          android:icon="@drawable/icon_delete"
          android:title="Delete" />  

    <item android:id="@+id/menu_preferences"
          android:icon="@drawable/icon_preferences"
          android:title="Preferences" /> 
</menu>

现在打开您的主 Activity 类文件并输入以下代码 MenusActivity.java

import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.widget.Toast;

public class AndroidMenusActivity extends Activity {
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
    }

    // Initiating Menu XML file (menu.xml)
    @Override
    public boolean onCreateOptionsMenu(Menu menu)
    {
        MenuInflater menuInflater = getMenuInflater();
        menuInflater.inflate(R.layout.menu, menu);
        return true;
    }

    /**
     * Event Handling for Individual menu item selected
     * Identify single menu item by it's id
     * */
    @Override
    public boolean onOptionsItemSelected(MenuItem item)
    {

        switch (item.getItemId())
        {
        case R.id.menu_bookmark:
            // Single menu item is selected do something
            // Ex: launching new activity/screen or show alert message
            Toast.makeText(AndroidMenusActivity.this, "Bookmark is Selected", Toast.LENGTH_SHORT).show();
            return true;

        case R.id.menu_save:
            Toast.makeText(AndroidMenusActivity.this, "Save is Selected", Toast.LENGTH_SHORT).show();
            return true;

        case R.id.menu_search:
            Toast.makeText(AndroidMenusActivity.this, "Search is Selected", Toast.LENGTH_SHORT).show();
            return true;

        case R.id.menu_share:
            Toast.makeText(AndroidMenusActivity.this, "Share is Selected", Toast.LENGTH_SHORT).show();
            return true;

        case R.id.menu_delete:
            Toast.makeText(AndroidMenusActivity.this, "Delete is Selected", Toast.LENGTH_SHORT).show();
            return true;

        case R.id.menu_preferences:
            Toast.makeText(AndroidMenusActivity.this, "Preferences is Selected", Toast.LENGTH_SHORT).show();
            return true;

        default:
            return super.onOptionsItemSelected(item);
        }
    }    

}
于 2013-07-16T11:34:24.403 回答
1

您只需要根据您的需要在清单文件中进行小幅更改即可更改主题我通过小幅更改即可解决上述问题，即即使使用任何版本的 android 也适用（2.3 到最新版本 4.4 kitkat）。

  <application
        android:allowBackup="true"
        android:debuggable="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
         android:theme="@android:style/Theme.WithActionBar">
于 2014-01-10T10:16:00.413 回答