android-SearchView无意启动可搜索活动

我正在使用SearchView来启动一个显示搜索结果的新活动.我遵循以下来源：

> Android教程：Creating a Search Interface
>因此：Start new activity from SearchView
>因此：Cannot get searchview in actionbar to work

新的可搜索活动ListActivity是从MainActivity的应用栏中的SearchView小部件启动的.新的可搜索活动已启动,但是缺少搜索意图(从不调用onNewIntent方法).

Searchable.xml

<?xml version="1.0" encoding="utf-8"?>
<searchable xmlns:android="http://schemas.android.com/apk/res/android"
    android:label="@string/app_label"
    android:hint="@string/search_hint" >
</searchable>

AndroidManifest.xml

<application
    ...
    <meta-data
        android:name="android.app.default_searchable"
        android:value=".ui.ListActivity" />
    <activity
        android:name=".ui.MainActivity"
        ...
    </activity>
    <activity
        android:name=".ui.ListActivity"
        android:launchMode="singleTop"
        ...
        <meta-data
            android:name="android.app.searchable"
            android:resource="@xml/searchable" />
        <intent-filter>
            <action android:name="android.intent.action.SEARCH" />
        </intent-filter>
    </activity>
</application>

主要活动

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // setSupportActionBar
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.main_menu, menu);    
        SearchManager searchManager = (SearchManager) getSystemService(Context.SEARCH_SERVICE);
        SearchView searchView = (SearchView) menu.findItem(R.id.action_search).getActionView();
        searchView.setSearchableInfo( searchManager.getSearchableInfo(getComponentName()));
        searchView.setIconifiedByDefault(false); 
        return true;
    }
}

ListActivity

public class ListActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {    
        Log.d(TAG, "onCreate invoked");    //Log Printed
        ...
    }

    @Override
    protected void onNewIntent(Intent intent) {
        Log.d(TAG, "onNewIntent invoked");    //Log NOT Printed
    }
}

考虑到我也用新的ComponentName(this,ListActivity.class)替换了getComponentName(),但是得到了相同的结果：没有错误,没有意图查询.

解决方法:

按照onNewIntent()’s documentation：

This is called for activities that set launchMode to “singleTop” in their package, or if a client used the 07001 flag when calling 07002. In either case, when the activity is re-launched while at the top of the activity stack instead of a new instance of the activity being started, onNewIntent() will be called on the existing instance with the Intent that was used to re-launch it.

singleTop仅在活动(在您的情况下为ListActivity)位于顶部的情况下才适用-代替创建新实例,它将重用现有的实例.但是,如果仅从MainActivity中进行搜索(在搜索后返回ListActivity),则将销毁ListActivity实例,然后创建一个新实例-导致调用onCreate(),而不是onNewIntent().

标签：android-intent,searchview,android
来源： https://codeday.me/bug/20191027/1943860.html