我正在使用位于操作栏中的SearchView。我希望使用自动完成功能从数据库获取搜索结果。
这是否可能?还是我需要使用自定义文本框,然后添加自动完成功能?
我正在使用位于操作栏中的SearchView。我希望使用自动完成功能从数据库获取搜索结果。
这是否可能?还是我需要使用自定义文本框,然后添加自动完成功能?
我刚刚为v7版本做了这个事情,但惊讶地发现我不能简单地使用ArrayAdapter设置适配器。
我不想使用默认的AutoCompleteTextView(正如这里的顶级评论者所做的那样),因为那样你就会错过SearchView的许多炫酷功能,比如小的搜索图标和x按钮。
所以我扩展了SearchView并得到了以下结果:
public class ArrayAdapterSearchView extends SearchView {
private SearchView.SearchAutoComplete mSearchAutoComplete;
public ArrayAdapterSearchView(Context context) {
super(context);
initialize();
}
public ArrayAdapterSearchView(Context context, AttributeSet attrs) {
super(context, attrs);
initialize();
}
public void initialize() {
mSearchAutoComplete = (SearchAutoComplete) findViewById(android.support.v7.appcompat.R.id.search_src_text);
this.setAdapter(null);
this.setOnItemClickListener(null);
}
@Override
public void setSuggestionsAdapter(CursorAdapter adapter) {
// don't let anyone touch this
}
public void setOnItemClickListener(OnItemClickListener listener) {
mSearchAutoComplete.setOnItemClickListener(listener);
}
public void setAdapter(ArrayAdapter<?> adapter) {
mSearchAutoComplete.setAdapter(adapter);
}
public void setText(String text) {
mSearchAutoComplete.setText(text);
}
}
<menu xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto" >
<item
android:id="@+id/action_search"
android:icon="@android:drawable/ic_menu_add"
android:title="TITLE"
app:actionViewClass="com.yourpackage.ArrayAdapterSearchView"
app:showAsAction="ifRoom|collapseActionView"/>
</menu>
MenuItem searchItem = menu.findItem(R.id.action_search);
final ArrayAdapterSearchView searchView = (ArrayAdapterSearchView)searchItem.getActionView();
searchView.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
searchView.setText(adapter.getItem(position).toString());
}
});
以下是适用于常规的 android.widget.SearchView 的类似版本:
public class ArrayAdapterSearchView extends SearchView {
private AutoCompleteTextView mSearchAutoComplete;
public ArrayAdapterSearchView(Context context) {
super(context);
initialize();
}
public ArrayAdapterSearchView(Context context, AttributeSet attrs) {
super(context, attrs);
initialize();
}
public void initialize() {
mSearchAutoComplete = (AutoCompleteTextView) findViewById(getResources().getIdentifier("android:id/search_src_text", null, null));
setAutoCompleSuggestionsAdapter(null);
setOnItemClickListener(null);
}
@Override
public void setSuggestionsAdapter(CursorAdapter adapter) {
throw new UnsupportedOperationException("Please use setAutoCompleSuggestionsAdapter(ArrayAdapter<?> adapter) instead");
}
public void setOnItemClickListener(AdapterView.OnItemClickListener listener) {
mSearchAutoComplete.setOnItemClickListener(listener);
}
public void setAutoCompleSuggestionsAdapter(ArrayAdapter<?> adapter) {
mSearchAutoComplete.setAdapter(adapter);
}
public void setText(String text) {
mSearchAutoComplete.setText(text);
}
}
我使用了自定义的AutoCompleteTextView,并将其添加到ActionBar中。
public class MainActivity extends Activity {
private static final String[] COUNTRIES = new String[] { "Belgium",
"France", "France_", "Italy", "Germany", "Spain" };
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ActionBar actionBar = getActionBar();
actionBar.setDisplayHomeAsUpEnabled(true);
actionBar.setDisplayShowCustomEnabled(true);
// actionBar.setDisplayShowTitleEnabled(false);
// actionBar.setIcon(R.drawable.ic_action_search);
LayoutInflater inflator = (LayoutInflater) this
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View v = inflator.inflate(R.layout.actionbar, null);
actionBar.setCustomView(v);
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,
android.R.layout.simple_dropdown_item_1line, COUNTRIES);
AutoCompleteTextView textView = (AutoCompleteTextView) v
.findViewById(R.id.editText1);
textView.setAdapter(adapter);
}
}
您的布局:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:gravity="center" >
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Action Bar:"
android:textAppearance="?android:attr/textAppearanceMedium"
android:textColor="#FFFFFF" />
<AutoCompleteTextView
android:id="@+id/editText1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:ems="10"
android:imeOptions="actionSearch"
android:inputType="textAutoComplete|textAutoCorrect"
android:textColor="#FFFFFF" >
<requestFocus />
</AutoCompleteTextView>
</LinearLayout>
编辑:
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
MenuItem searchItem = menu.findItem(R.id.search);
SearchView mSearchView = (SearchView) MenuItemCompat.getActionView(searchItem);
SearchAutoComplete searchAutoComplete = (SearchAutoComplete) mSearchView.findViewById(android.support.v7.appcompat.R.id.search_src_text);
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,
android.R.layout.simple_dropdown_item_1line, itemArrayList);
searchAutoComplete.setAdapter(adapter);
SearchManager searchManager =
(SearchManager) getSystemService(this.SEARCH_SERVICE);
mSearchView.setSearchableInfo(
searchManager.getSearchableInfo(getComponentName()));
return true;
}
searchAutoComplete.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position,
long id) {
// TODO Auto-generated method stub
String searchString=(String)parent.getItemAtPosition(position);
searchAutoComplete.setText(""+searchString);
Toast.makeText(MainActivity.this, "you clicked "+searchString, Toast.LENGTH_LONG).show();
}
});
java.lang.NullPointerException: Attempt to invoke virtual method 'void android.support.v7.widget.SearchView$SearchAutoComplete.setTextColor(int)' on a null object reference
。似乎 searchAutoComplete 对象总是返回 null。你有任何想法为什么会这样吗? - VIN这里有一种使用 CursorAdapter
的替代方法:
ExampleActivity.java
private Menu menu;
@Override
@TargetApi(Build.VERSION_CODES.HONEYCOMB)
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.example, menu);
this.menu = menu;
if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
SearchManager manager = (SearchManager) getSystemService(Context.SEARCH_SERVICE);
SearchView search = (SearchView) menu.findItem(R.id.search).getActionView();
search.setSearchableInfo(manager.getSearchableInfo(getComponentName()));
search.setOnQueryTextListener(new OnQueryTextListener() {
@Override
public boolean onQueryTextChange(String query) {
loadHistory(query);
return true;
}
});
}
return true;
}
// History
@TargetApi(Build.VERSION_CODES.HONEYCOMB)
private void loadHistory(String query) {
if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
Cursor cursor = db.rawQuery("SELECT * FROM items", null); // Example database query
SearchManager manager = (SearchManager) getSystemService(Context.SEARCH_SERVICE);
final SearchView search = (SearchView) menu.findItem(R.id.search).getActionView();
search.setSearchableInfo(manager.getSearchableInfo(getComponentName()));
search.setSuggestionsAdapter(new ExampleAdapter(this, cursor, items));
}
}
CursorAdapter
的适配器:
ExampleAdapter.java
public class ExampleAdapter extends CursorAdapter {
private List<String> items;
private TextView text;
public ExampleAdapter(Context context, Cursor cursor, List<String> items) {
super(context, cursor, false);
this.items = items;
}
@Override
public void bindView(View view, Context context, Cursor cursor) {
text.setText(cursor.getString(cursor.getColumnIndex("text"))); // Example column index
}
@Override
public View newView(Context context, Cursor cursor, ViewGroup parent) {
LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View view = inflater.inflate(R.layout.item, parent, false);
text = (TextView) view.findViewById(R.id.text);
return view;
}
}
CursorAdapter
时,请勿导入Android支持版本,而是导入标准的android.widget.CursorAdapter
。<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<TextView
android:id="@+id/item"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</RelativeLayout>
<menu xmlns:android="http://schemas.android.com/apk/res/android">
<item
android:id="@+id/search"
android:title="@string/search"
android:showAsAction="ifRoom"
android:actionViewClass="android.widget.SearchView" />
</menu>
<searchable xmlns:android="http://schemas.android.com/apk/res/android"
android:label="@string/search"
android:hint="@string/search" >
</searchable>
最后,在清单文件的相关活动标记中添加以下内容:
AndroidManifest.xml
<intent-filter>
<action android:name="android.intent.action.SEARCH" />
</intent-filter>
<meta-data
android:name="android.app.default_searchable"
android:value="com.example.ExampleActivity" />
<meta-data
android:name="android.app.searchable"
android:resource="@xml/searchable" />
@string/search
字符串应该在values/strings.xml中定义,同时不要忘记为您的项目更新对com.example
的引用。是的,这是可能的。建立一个表格(例如在SQLiteDatabase中)来存储您的建议,并使用所需的列格式化该表格。
SearchAutoComplete searchAutoComplete = mSearchView.findViewById(androidx.appcompat.R.id.search_src_text);
对于androidx版本
您可以通过 CursorAdapter 实现此操作,例如:
MenuItem searchItem = menu.findItem(R.id.action_search);
SearchView searchView = (SearchView) MenuItemCompat.getActionView(searchItem);
searchView.setSuggestionsAdapter(adapter);
onQueryTextChange()
(SearchView.OnQueryTextListener
)结合使用这种方法,并且很快就使事情正常化了。 - JonikCursorAdapter
。 - Mussa