SearchView is null android

Question

Xin chào Tôi đang cố gắng triển khai SearchView giống như chúng tôi có trong Gmail.

@Override 
public boolean onCreateOptionsMenu(Menu menu) { 
    if (!mNavigationDrawerFragment.isDrawerOpen()) { 
     getMenuInflater().inflate(R.menu.main, menu); 

     searchManager = (SearchManager) getSystemService(Context.SEARCH_SERVICE); 
     searchView = (SearchView) menu.findItem(R.id.action_search).getActionView(); 
     searchView.setSearchableInfo(searchManager.getSearchableInfo(getComponentName())); 


     restoreActionBar(); 
     return true; 
    } 

    return super.onCreateOptionsMenu(menu); 
} 

đối tượng SearchView là null

Manifest:

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

    <uses-sdk 
     android:minSdkVersion="18" 
     android:targetSdkVersion="21" /> 

    <uses-permission android:name="android.permission.INTERNET" /> 
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /> 

    <application 
     android:allowBackup="true" 
     android:icon="@drawable/logo" 
     android:label="@string/app_name" 
     android:theme="@style/AppTheme" > 
     <meta-data 
      android:name="android.app.default_searchable" 
      android:value=".GameSearchActivity" /> 

     <activity 
      android:name=".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> 
     <activity 
      android:name=".GameInfoActivity" 
      android:label="@string/title_activity_game_info" > 
      <meta-data 
       android:name="android.support.PARENT_ACTIVITY" 
       android:value=".MainActivity" /> 
     </activity> 
     <activity 
      android:name=".SettingsActivity" 
      android:label="@string/title_activity_settings" > 
      <meta-data 
       android:name="android.support.PARENT_ACTIVITY" 
       android:value=".MainActivity" /> 
     </activity> 
     <activity 
      android:name=".GameSearchActivity" 
      android:label="@string/title_activity_game_search" > 
      <intent-filter> 
       <action android:name="android.intent.action.SEARCH" /> 
      </intent-filter> 

      <meta-data 
       android:name="android.app.searchable" 
       android:value="@xml/searchable" /> 
     </activity> 
    </application> 

</manifest> 

Searchable.xml

<searchable xmlns:android="http://schemas.android.com/apk/res/android" 
    android:label="@string/app_name" 
    android:hint="@string/search_hint" /> 

bố trí menu:

<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.example.dgp.MainActivity" > 

<item 
    android:id="@+id/action_search" 
    android:icon="@drawable/ic_action_search" 
    app:showAsAction="collapseActionView|always" 
    android:title="@string/action_search" 
    android:actionViewClass="android.support.v7.widget.SearchView"/> 

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

Có ai có thể giúp hiểu tại sao đối tượng này bị vô hiệu không? Cảm ơn bạn !!!!

Answer 1

Trong Menu Layout:

<item 
    android:id="@+id/action_search" 
    android:icon="@drawable/ic_action_search" 
    app:showAsAction="collapseActionView|always" 
    android:title="@string/action_search" 
    android:actionViewClass="android.support.v7.widget.SearchView"/> 

sử dụng này:

<item 
    android:id="@+id/action_search" 
    android:icon="@drawable/ic_action_search" 
    app:showAsAction="collapseActionView|always" 
    android:title="@string/action_search" 
    app:actionViewClass="android.support.v7.widget.SearchView"/> 

Vì vậy, bạn cần phải sử dụng app thay vì android trong thẻ mục menu:

app:actionViewClass="android.support.v7.widget.SearchView" 

Answer 2

thử

MenuItem searchItem = menu.findItem(R.id.action_search); 
searchView = MenuItemCompat.getActionView(searchItem); 

Answer 3

Để ủng hộ quan điểm tìm kiếm bạn cần phải sử dụng

ứng dụng: actionViewClass = "android.support.v7.widget.SearchView" ---- trong xml đơn nộp

Và sẽ phải nhập khẩu

android.support.v7.widget.SearchView trong file java

hãy nhìn xe lớp được nhập một cách hợp lý là android.support.v7.widget.SearchView. khi hai phần này không giống nhau thì ngoại lệ con trỏ null có thể xảy ra.