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java - Android:将搜索 Activity 设为单顶

转载 作者:行者123 更新时间:2023-12-02 10:45:44 26 4
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我有一个 Activity,其中使用 ListView 来显示一些数据,我还想使用 SearchView 进行一些过滤,并且我想要在同一个Activity中显示过滤后的结果。

    @Override
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.options_menu, menu);

SearchManager searchManager = (SearchManager) getSystemService(SEARCH_SERVICE);
SearchView searchView = (SearchView) menu.findItem(R.id.search).getActionView();
searchView.setSearchableInfo(searchManager.getSearchableInfo(getComponentName()));
searchView.setSubmitButtonEnabled(true);

return true;
}

我正确地进行了搜索,但我注意到,每当我进行新的搜索过程时,都会创建一个新的 Activity 实例。因此,我想通过将 android:launchMode="singleTop" 放入我的 list 来将 Activity 作为 singleTop 启动,并尝试处理搜索过程在 onNewIntent 方法中。但效果并不好。每当我进行新搜索时,Activity 仍然会创建。

如何避免这种情况?任何帮助将不胜感激。

最佳答案

我会尝试举一个例子。

假设我们有一个布局文件activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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"
android:id="@+id/relativeLayout"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">

<android.support.design.widget.AppBarLayout
android:id="@+id/appbar_layout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:theme="@style/AppTheme.AppBarOverlay">

<android.support.v7.widget.Toolbar
android:id="@+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="?attr/colorPrimary"
app:popupTheme="@style/AppTheme.PopupOverlay" >

</android.support.v7.widget.Toolbar>

</android.support.design.widget.AppBarLayout>

<include layout="@layout/content_main" />

<ListView
android:id="@+id/listView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="@id/appbar_layout"></ListView>

</RelativeLayout>

menu_main.xml

<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.prateek.search.MainActivity">
<item
android:id="@+id/action_settings"
android:orderInCategory="100"
android:title="@string/action_settings"
app:showAsAction="never" />

<item
android:id="@+id/search"
android:title="Search"
app:actionViewClass="android.support.v7.widget.SearchView"
app:showAsAction="ifRoom"/>
</menu>

这是MainActivity.java 文件

public class MainActivity extends AppCompatActivity implements SearchView.OnQueryTextListener {

SearchView searchView;
ListView listView;
String[] values = {"John", "Jack", "Alfred", "Bruce", "Frank"};
ArrayAdapter<String> adapter;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);

listView = (ListView) findViewById(R.id.listView);

adapter = new ArrayAdapter<>(this, android.R.layout.simple_list_item_1, android.R.id.text1, values);
listView.setAdapter(adapter);
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
SearchManager searchManager = (SearchManager) getSystemService(SEARCH_SERVICE);
searchView = (SearchView) menu.findItem(R.id.search).getActionView();
searchView.setSearchableInfo(searchManager.getSearchableInfo(getComponentName()));
searchView.setSubmitButtonEnabled(true);
searchView.setOnQueryTextListener(this);
return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();

//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}

return super.onOptionsItemSelected(item);
}

@Override
public boolean onQueryTextSubmit(String query) {
return false;
}

@Override
public boolean onQueryTextChange(String newText) {
String text = newText;
adapter.getFilter().filter(text);
return false;
}
}

当您搜索任何元素时,过滤后的结果应显示在同一 Activity 中。希望对您有帮助!

styles.xml文件

<resources>

<!-- Base application theme. -->
<style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
<!-- Customize your theme here. -->
<item name="colorPrimary">@color/colorPrimary</item>
<item name="colorPrimaryDark">@color/colorPrimaryDark</item>
<item name="colorAccent">@color/colorAccent</item>
</style>

<style name="AppTheme.NoActionBar">
<item name="windowActionBar">false</item>
<item name="windowNoTitle">true</item>
</style>

<style name="AppTheme.AppBarOverlay" parent="ThemeOverlay.AppCompat.Dark.ActionBar" />

<style name="AppTheme.PopupOverlay" parent="ThemeOverlay.AppCompat.Light" />

</resources>

关于java - Android:将搜索 Activity 设为单顶,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/52599240/

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