Android SearchView.OnQueryTextListener OnQueryTextSubmit未在空查询字符串上触发

时间:2012-11-27 01:56:22

标签: android searchview

我使用的是Android 4.1.2。我在ActionBar上有一个SearchView小部件。来自android开发者网站的SearchView.OnQueryTextListener上的文档指出,当用户提交查询时调用onQueryTextSubmit。这可能是由于键盘上的按键或按下提交按钮。 “

如果搜索查询为空,则不会发生这种情况。我需要这个来触发一个空查询来清除ListView的搜索过滤器。这是一个错误还是我做错了什么?

13 个答案:

答案 0 :(得分:14)

这不是一个错误,source code故意检查空值和空值:

private void onSubmitQuery() {
    CharSequence query = mQueryTextView.getText();
    if (query != null && TextUtils.getTrimmedLength(query) > 0) {

但是,当用户清除搜索EditText时,您应该能够使用OnQueryTextChange回调清除ListView的过滤器。

答案 1 :(得分:12)

我更容易解决: 使用onQueryTextChange,但只有在其为空时才会呈现。

searchView.setOnQueryTextListener(new SearchView.OnQueryTextListener() {
            @Override
            public boolean onQueryTextSubmit(String query) {
                    renderList(true);
                    return false;
            }

            @Override
            public boolean onQueryTextChange(String newText) {
                    if (searchView.getQuery().length() == 0) {
                            renderList(true);
                    }
                    return false;
            }
    });

答案 2 :(得分:10)

我遇到了同样的问题并最终得到了以下解决方案:自定义SearchView + OnQueryTextListener.onQueryTextChange

自定义SearchView:

public class MySearchView extends SearchView {

private boolean expanded;

public MySearchView(Context context) {
    super(context);
}

@Override
public void onActionViewExpanded() {
    super.onActionViewExpanded();
    expanded = true;
}

@Override
public void onActionViewCollapsed() {
    super.onActionViewCollapsed();
    expanded = false;
}

public boolean isExpanded() {
    return expanded;
}
}

创建动作并设置回调:

@Override
public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
    super.onCreateOptionsMenu(menu, inflater);
    searchAction = menu.add(0, SEARCH_ACTION_ID, 0 , getString(R.string.action_search));
    searchAction.setShowAsAction(SHOW_AS_ACTION_ALWAYS | SHOW_AS_ACTION_COLLAPSE_ACTION_VIEW);       
    searchView = new MySearchView(getSherlockActivity());
    searchView.setOnQueryTextListener(searchQueryListener);
    searchView.setIconifiedByDefault(true);
    searchAction.setActionView(searchView);
}

最后听众:

private OnQueryTextListener searchQueryListener = new OnQueryTextListener() {
    @Override
    public boolean onQueryTextSubmit(String query) {
        search(query);
        return true;
    }

    @Override
    public boolean onQueryTextChange(String newText) {
        if (searchView.isExpanded() && TextUtils.isEmpty(newText)) {
            search("");
        }

        return true;
    }

    public void search(String query) {
        // reset loader, swap cursor, etc.
    }

};

在ABS 4.3上测试。

答案 3 :(得分:9)

我在SearchView上遇到了同样的问题。我的解决方案包括样式SearchView,如指南http://novoda.com/blog/styling-the-actionbar-searchview/所示,并为EditText设置OnEditorActionListener(How do I trigger an action when the user has hit enter?),这是SearchView的一部分:

final SearchView searchView = (SearchView)findViewById(R.id.search);
int searchPlateId = searchView.getContext().getResources().getIdentifier("android:id/search_src_text", null, null);
EditText searchPlate = (EditText) searchView.findViewById(searchPlateId);
searchPlate.setOnEditorActionListener(new TextView.OnEditorActionListener() {
    @Override
    public boolean onEditorAction(TextView v, int actionId, KeyEvent event) {

        if (actionId == EditorInfo.IME_ACTION_SEARCH) {
            //Do something
        }
        return false;

    });

答案 4 :(得分:3)

正如其他人所说,这种行为是故意的。我放弃了OnQueryChangeListener的解决方案,并决定通过在SearchView的OnEditorActionListener上实施EditText来解决这个问题,您可以使用R.id.search_src_text来处理问题。只要您setImeOptions的SearchView EditorInfo.IME_ACTION_SEARCH,您就可以点击键盘搜索按钮。有关详细信息,请参阅this SO answer

答案 5 :(得分:1)

我遇到了同样的问题,因为不支持空查询我必须下载并使用ActionBarSherlock然后修改onSubmitQuery()方法。

这就是我的onSubmitQuery()现在的样子

private void onSubmitQuery() {
     CharSequence query = mQueryTextView.getText();
     if (query == null) {query = "";}
     if (mOnQueryChangeListener == null
             || !mOnQueryChangeListener.onQueryTextSubmit(query.toString())) {
         if (mSearchable != null) {
             launchQuerySearch(KeyEvent.KEYCODE_UNKNOWN, null, query.toString());
             setImeVisibility(false);
         }
         dismissSuggestions();
     }
 }

希望这有帮助。

答案 6 :(得分:0)

您无法覆盖此行为。 当用户退出搜索视图时,解决方法可能是清除过滤器。

您可以使用OnCloseListener。 但是,这也会导致问题,具体取决于您正在开发的最低API级别。

答案 7 :(得分:0)

另一种选择是通过T​​extWatcher手动触发onQueryTextChange方法:

public class MyActivity extends Activity implements SearchView.OnQueryTextListener, TextWatcher {

    // Basic onCreate(Bundle) here

    @Override
    public boolean onCreateOptionsMenu (final Menu menu) {
        getMenuInflater().inflate(R.menu.myMenu, menu);

        final SearchView searchView = (SearchView) menu.findItem(R.id.action_search).getActionView();
        final SearchManager manager = (SearchManager) getSystemService(SEARCH_SERVICE);
        searchView.setSearchableInfo(manager.getSearchableInfo(getComponentName()));
        searchView.setOnQueryTextListener(this);

        final int resource_edit_text = searchView.getContext().getResources().getIdentifier("android:id/search_src_text", null, null);
        ((EditText) searchView.findViewById(resource_edit_text)).addTextChangedListener(this);

        return super.onCreateOptionsMenu(menu);
    }

    // Implementation of TextWatcher, used to have a proper onQueryTextChange (it doesn't update when the last character is removed)
    @Override
    public void beforeTextChanged (final CharSequence charSequence, final int start, final int count, final int after) {}

    @Override
    public void onTextChanged (final CharSequence charSequence, final int start, final int before, final int after) {}

    @Override
    public void afterTextChanged (final Editable editable) {
        if (editable.length() == 0)
            onQueryTextChange(editable.toString());
    }

    // Implementation of OnQueryTextChangeListener

    @Override
    public boolean onQueryTextChange (final String query) {
        // do stuff
        return false;
    }

    @Override
    public boolean onQueryTextSubmit (final String query) {
        // do stuff
        return false;
    }
}

这一切都与这里放弃的所有默认xml文件一致,这不是这个答案的重点。这是我选择使用的解决方法,随意使用其他人

答案 8 :(得分:0)

我可以通过以这种方式实现setOnQueryTextListener来实现:

SearchView searchView = (SearchView) menu.findItem(R.id.searchProductView).getActionView();
    searchView.setOnQueryTextListener(new SearchView.OnQueryTextListener() {
        @Override
        public boolean onQueryTextSubmit(String query) {
            return false;
        }

        @Override
        public boolean onQueryTextChange(String newText) {
            if (TextUtils.isEmpty(newText)) {
                loadLocalData(newText);
            }
            return true;
        }
    });

我的loadLocalData方法是

//query my DB
products = ProductDAO.findByIdList(idList);
LinearLayoutManager layoutManager = new LinearLayoutManager(this);
listView.setLayoutManager(layoutManager);
listView.setAdapter(<YOURADAPTER>)

即使您使用&#34; X&#34;清除文本,此解决方案也会清除您的查询。按钮

答案 9 :(得分:0)

在我的情况下,我只是想让用户清除他的查询,因为它在API搜索中用作关键字,所以最简单的想法是:

    searchView.setOnSearchClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            userQuery = "";
        }
    });

其中userQuery是我用于搜索等的变量。

希望它可以帮助某人:)

答案 10 :(得分:0)

这是一个旧线程,但是我找到了另一个解决方案(Kotlin代码,但也可以在Java中工作):

override fun onQueryTextChange(newText: String?): Boolean {
            if(newText == null || newText.isEmpty())
                searchView.setQuery("\u00A0", false)
            return true
        }

\u00A0是一个看起来像空格的字符,但就代码而言却不是。换句话说,SearchView不为空。空字符串或" "将不起作用,因为基本SearchView使用修剪,而且用户可能希望搜索以空格结尾或开头的文本。但据我所知,用户无法输入\u00A0字符。

然后您要做的就是在自定义SearchView中将getQuery覆盖为return super.getQuery.replace("\u00A0", "")

答案 11 :(得分:0)

这是用Kotlin编写的完整示例:

import android.content.Context
import android.text.TextUtils
import android.util.AttributeSet
import android.view.inputmethod.EditorInfo
import android.widget.TextView
import androidx.appcompat.widget.SearchView

/**
 * Custom [SearchView] which can listen to empty submit events
 *
 * If the internal implementation would change, this will not crash at runtime. It will simply
 * ignore the empty submit listener and will continue to work as this is the base [SearchView]
 */
class EmptySubmitSearchView @JvmOverloads constructor(
    context: Context,
    attrs: AttributeSet? = null,
    defStyleAttr: Int = 0
) : SearchView(context, attrs, defStyleAttr) {

    private lateinit var searchAutoComplete: SearchAutoComplete

    private lateinit var internalEditorListener: TextView.OnEditorActionListener

    private var emptySubmitListener: OnEmptySubmitListener? = null

    init {
        try {
            val defaultListenerField = SearchView::class.java
                .getDeclaredField("mOnEditorActionListener")
            defaultListenerField.isAccessible = true
            internalEditorListener = defaultListenerField.get(this) as TextView.OnEditorActionListener

            val searchAutoCompleteField = SearchView::class.java
                .getDeclaredField("mSearchSrcTextView")
            searchAutoCompleteField.isAccessible = true
            searchAutoComplete = searchAutoCompleteField.get(this) as SearchAutoComplete

            searchAutoComplete.setOnEditorActionListener { v, actionId, event ->
                if (actionId == EditorInfo.IME_ACTION_DONE && TextUtils.isEmpty(searchAutoComplete.text)) {
                    emptySubmitListener?.onEmptyTextSubmit()
                } else {
                    internalEditorListener.onEditorAction(v, actionId, event)
                }
                true
            }
        } catch (ignored: Exception) {
            //Some internal field has changed. Check there is a field called
            //mSearchSrcTextView and mOnEditorActionListener and if not update them accordingly
        }
    }

    /**
     * Set custom empty listener or null to remove it
     */
    fun setOnEmptySubmitListener(listener: OnEmptySubmitListener?) {
        emptySubmitListener = listener
    }

    interface OnEmptySubmitListener {
        fun onEmptyTextSubmit()
    }
}

您可以使用setOnEmptySubmitListener设置自定义侦听器,这将使您能够区分事件。

您可以自定义要响应的actionId,在这种情况下,我在XML中使用了android:imeOptions="actionDone|flagNoExtractUi"

答案 12 :(得分:0)

这是 samvel1024 的答案,将其转换为 Kotlin。 您可能需要将 IME_ACTION_GO 更改为您用于键盘“开始”按钮的任何内容。只需在页面初始化期间运行此方法。

/**
 * Business: User should be allowed to perform an empty search.
 * SearchView does not cause OnQueryTextChange to fire when the box is empty.
 * To create a listener method for this scenario, we use reflection to gain access to the SearchView's inner TextView.
 */
private fun enableEmptySearch(searchView: SearchView) {
    try {
        val searchViewClass = searchView::class.java
        val currentListenerField: Field = searchViewClass.getDeclaredField("mOnEditorActionListener")
        currentListenerField.isAccessible = true
        val previousListener: TextView.OnEditorActionListener = currentListenerField.get(searchView) as TextView.OnEditorActionListener
        val newListener: TextView.OnEditorActionListener = TextView.OnEditorActionListener { v, actionId, event ->
            if (actionId == EditorInfo.IME_ACTION_GO && v.text.isEmpty()) {
                querySubmit()
            }
            previousListener.onEditorAction(v, actionId, event)
        }
        val innerTextViewField: Field = searchViewClass.getDeclaredField("mSearchSrcTextView")
        innerTextViewField.isAccessible = true
        (innerTextViewField.get(searchView) as TextView).setOnEditorActionListener(newListener) // Allow user to tap the "GO" button when the SearchView is empty.
    } catch (ignored: Exception) {
        // If a major change occurs to android SDK, internal fields mSearchSrcTextView or mOnEditorActionListener might not exist.
        // This exception will prevent this additional feature from functioning, but not crash the app or cause any other issues.
    }
}