Question

我已经完成了android动作栏谷歌教程，但这就是我得到的：

enter image description here

动作设置按钮不会出现，并且当按下搜索按钮时没有任何反应。谁能告诉我代码有什么问题？

这里是文件代码..

MainActivity.java

package com.example.actionbar;

import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;

public class MainActivity extends ActionBarActivity {

public void openSearch(){

    System.out.println("TEST SEARCH");

}
public void openSettings(){

    System.out.println("TEST SETTINGS");

}

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

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

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    // Handle presses on the action bar items
    switch (item.getItemId()) {
        case R.id.action_search:
            openSearch();
            return true;
        case R.id.action_settings:
            openSettings();
            return true;
        default:
            return super.onOptionsItemSelected(item);
    }
}

}

MainActivityActions.xml

<menu xmlns:android="http://schemas.android.com/apk/res/android"
  xmlns:yourapp="http://schemas.android.com/apk/res-auto" >
<!-- Search, should appear as action button -->
<item android:id="@+id/action_search"
      android:icon="@drawable/ic_action_search"
      android:title="@string/action_search"
      yourapp:showAsAction="always"  />

<!-- Settings, should always be in the overflow -->
<item android:id="@+id/action_settings"
      android:title="@string/action_settings"
      android:showAsAction="never" />
</menu>

的AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.actionbar"
android:versionCode="1"
android:versionName="1.0" >

<uses-sdk
    android:minSdkVersion="7"
    android:targetSdkVersion="18" />

<application
    android:allowBackup="true"
    android:icon="@drawable/ic_launcher"
    android:label="@string/app_name"
    android:theme="@style/Theme.AppCompat.Light" >
    <activity
        android:name="com.example.actionbar.MainActivity"
        android:label="@string/app_name" >
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
</application>

</manifest>

Answer 1

在您的MainActivityActions.xml中，将设置下的android:showAsAction="never"更改为＆＃34;始终＆＃34;

Answer 2

我发现你正在使用AppCompat。

使用appCompat时，您需要在菜单xml中指定更多内容

例：

<menu xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:yourapp="http://schemas.android.com/apk/res-auto">

    <item android:id="@+id/action_search"
          android:icon="@drawable/ic_action_search"
          android:title="@string/action_search"
          yourapp:actionViewClass="android.support.v7.widget.SearchView"
          yourapp:showAsAction="always|collapseActionView"   />
    <item
        android:id="@+id/action_settings"
        android:title="@string/action_settings"
        yourapp:showAsAction="never" />

</menu>

注意：对于搜索项目，它缺少粗体部分：的 yourapp：actionViewClass = “android.support.v7.widget.SearchView” yourapp：showAsAction =“always | collapseActionView ”

和设置项缺少以下粗体部分：的 yourapp ：showAsAction = “从不”

actionViewClass意味着它将使用带有下拉“窗口”的SearchView

如果您不使用searchView，也可以使用collapseActionView使搜索项展开和折叠

请参阅Chris Banes关于appcompat的video

android actionbar谷歌教程

2 个答案: