android - ActionBar 中的 SearchView——*Up* 按钮的问题

Question

我正在使用 SearchView在ActionBar的 ListView .放大镜可以触摸，SearchView显示其编辑框，用户可以输入过滤列表内容的文本。它几乎可以工作。然而，当用户按下向上按钮时，SearchView折叠回图标，小部件内的文本被清除，过滤被重置。效果(在我的例子中)是列表只能在 SearchView 时被过滤。未图标化。想要的行为是在 SearchView 之后也保留过滤器文本。折叠了。

注意:该行为可能在 Android 4.3 中发生了变化。在 4.2.2 中，它按需要工作。请参阅以下观察结果。

详细信息:更具体地说，菜单包含以下项目:

<item android:id="@+id/menu_search_customers"
      android:title="@string/menu_search_text"
      android:icon="@android:drawable/ic_menu_search"
      android:showAsAction="ifRoom|collapseActionView"
      android:actionViewClass="android.widget.SearchView" />

注 Intent 标和 android:showAsAction .我相信当 SearchView 时 Up 按钮默认出现已展开(向上，我的意思是 < 加上图标——请参阅来自官方 Navigation with Back and Up 的蓝皮书的右图)。似乎默认处理程序实现只是折叠了扩展的 SearchView (返回图标状态)。

调试时，我发现 onQueryTextChange()当使用 Up 时，用空文本触发。 (我相信 Android 4.2.2 不是这种情况，因为它在操作系统更新之前按预期工作。)这就是为什么列表项的过滤也被重置的原因——参见我的 onQueryTextChange()以下。我想要 SearchView折叠，过滤文本在操作栏中显示为副标题。

到目前为止，我的代码与 SearchView 有关看起来像这样:

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // MenuInflater adds the magnifying glass icon for the SearchView 
    // to the ActionBar as the always visible menu item.
    MenuInflater inflater = getMenuInflater();
    inflater.inflate(R.menu.customers_menu, menu);

    // Get the related SearchView widget.
    SearchView sv = (SearchView) menu.findItem(R.id.menu_search_customers)
                                     .getActionView();

    // Get the changes immediately.
    sv.setOnQueryTextListener(new SearchView.OnQueryTextListener() {

        // I am not sure whether the onQueryTextSubmit() is important
        // for the purpose.
        @Override
        public boolean onQueryTextSubmit(String query) {
            getActionBar().setSubtitle(mCurFilter);
            return true;
        }


        @Override
        public boolean onQueryTextChange(String newText) {
            // The newText is stored into a member variable that
            // is used when the new CursorLoader is created.
            mCurFilter = newText;
            getActionBar().setSubtitle(mCurFilter);
            getLoaderManager().restartLoader(0, null,
                                             CustomersOverviewActivity.this);
            return true;
        }
    });

    return true;
}

重新启动的加载程序调用 onCreateLoader .注意 mCurFilter用于构建 SQL 查询:

@Override
public Loader<Cursor> onCreateLoader(int id, Bundle args) {
    String[] projection = { CustomerTable._ID,
                            CustomerTable.CODE,
                            CustomerTable.NAME,
                            CustomerTable.STREET,
                            CustomerTable.TOWN };

    String selection = null;        // init
    String[] selectionArgs = null;  // init

    if ( ! mCurFilter.isEmpty()) {
        selection = CustomerTable.NAME + " like ?";
        selectionArgs = new String[]{ "%" + mCurFilter +"%" };
    }
    CursorLoader cursorLoader = new CursorLoader(this,
            DemoContentProvider.CUSTOMERS_CONTENT_URI, projection,
            selection, selectionArgs,
            orderInfo);
    return cursorLoader;
}

我想检测在 onQueryTextChange() 之前按下 Up 的情况。叫做。这样(比如说)我可以设置一个标志并阻止 mCurFilter清空赋值SearchView内容。另外，当搜索图标再次展开时，我想初始化展开后的文本 SearchView来自 mCurFilter 在显示之前(即展开的 View 预设了过滤器文本)。如何做到这一点？

更新 SearchView 的早期实现有...

@Override
public void onActionViewCollapsed() {
    clearFocus();
    updateViewsVisibility(true);
    mQueryTextView.setImeOptions(mCollapsedImeOptions);
    mExpandedInActionView = false;
}

现在，它包含...

@Override
public void onActionViewCollapsed() {
    setQuery("", false);
    clearFocus();
    updateViewsVisibility(true);
    mQueryTextView.setImeOptions(mCollapsedImeOptions);
    mExpandedInActionView = false;
}

您知道将查询设置为空字符串的原因是什么吗？我应该用旧代码覆盖新实现吗？或者有更好的方法吗？

Answer 1

我写了一个StatefulSearchView，它保留了文本:

import android.content.Context;
import android.os.Parcel;
import android.os.Parcelable;
import android.text.TextUtils;
import android.util.AttributeSet;
import android.util.Log;
import android.view.View;
import android.widget.EditText;
import android.widget.SearchView;
import android.widget.SearchView.OnQueryTextListener;
import android.widget.TextView;

public class StatefulSearchView extends SearchView implements android.view.View.OnLayoutChangeListener, OnQueryTextListener,android.widget.SearchView.OnCloseListener{

    private boolean mSaveText=true;
    private OnQueryTextListener mQueryListener;
    private String mQuery;
    private OnCloseListener mCloseListener;
    private boolean fromIconify = true;

    public StatefulSearchView(Context context, AttributeSet attrs) {
        super(context, attrs);
        addOnLayoutChangeListener(this);
        super.setOnCloseListener(this);
    }

    public StatefulSearchView(Context context) {
        super(context);
        // TODO Auto-generated constructor stub
        addOnLayoutChangeListener(this);
        super.setOnCloseListener(this);
    }

    public void setSaveSearchTextState(boolean save){
        this.mSaveText = save;
        this.setSaveEnabled(mSaveText);

    }


    public void setOnStatefulQueryTextListener(OnQueryTextListener listener) {
        mQueryListener = listener; 
        super.setOnQueryTextListener(this);
    }

    @Override
    public void onLayoutChange(View v, int left, int top, int right,
            int bottom, int oldLeft, int oldTop, int oldRight, int oldBottom) {
        if(super.isIconfiedByDefault() || !super.isIconified() && !TextUtils.isEmpty(mQuery) && mSaveText){      
              setSavedText(mQuery);              
        }
         Log.i("onLayoutChanged()",""+mQuery);

    }


    @Override
    public void setIconified(boolean iconify) {
        mQuery = getQuery().toString();
        Log.i("setIconified()",""+mQuery);
        super.setOnCloseListener(null);
        super.setIconified(iconify);
        super.setIconified(iconify);
        super.setOnCloseListener(this);
        fromIconify = true;
    }


    @Override
    public void setOnCloseListener(OnCloseListener listener) {
        mCloseListener = listener;
        super.setOnCloseListener(this);
    }

    @Override
    protected Parcelable onSaveInstanceState() {
        Parcelable state =  super.onSaveInstanceState();
        return new SearchQueryState(state, mQuery, mSaveText);
    }

    @Override
    protected void onRestoreInstanceState(Parcelable state) {
        SearchQueryState sqs = (SearchQueryState)state;
        super.onRestoreInstanceState(sqs.getSuperState());
        mQuery = sqs.getSavedQuery();
        mSaveText = sqs.getSaveText();
    }

    @Override
    public boolean onQueryTextChange(String arg0) {
        mQuery = arg0;
        return mQueryListener.onQueryTextChange(mQuery);
    }

    @Override
    public boolean onQueryTextSubmit(String arg0) {
        // TODO Auto-generated method stub
        return mQueryListener.onQueryTextSubmit(arg0);
    }

    private TextView getTextView(){
        int searchTextViewId = getContext().getResources().getIdentifier("android:id/search_src_text", null, null);
        return (TextView) this.findViewById(searchTextViewId);
    }

    private void setSavedText(String s){
       super.setOnQueryTextListener(null);
       Log.i("setSavedText()",""+s);
       TextView t = getTextView();
       t.setText(s);
       if(!TextUtils.isEmpty(s))
           ((EditText)t).setSelection(s.length());
       super.setOnQueryTextListener(mQueryListener);
    }
    private class SearchQueryState extends BaseSavedState{

        private boolean mSaveText;
        private String mQueryText;
        public SearchQueryState(Parcel arg0) {
            super(arg0);
            this.mQueryText = arg0.readString();
            this.mSaveText = arg0.readInt() == 1;
        }

        public SearchQueryState(Parcelable superState, String queryText, boolean saveText) {
            super(superState);
            this.mQueryText = queryText;
            this.mSaveText = saveText;
        }

        public boolean getSaveText(){
            return this.mSaveText;
        }


        public String getSavedQuery(){
            return mQueryText;
        }
        @Override
        public void writeToParcel(Parcel dest, int flags) {
            // TODO Auto-generated method stub
            super.writeToParcel(dest, flags);
            dest.writeString(mQueryText);
            dest.writeInt(mSaveText? 1: 0);
        }


    }

    @Override
    public boolean onClose() {
        Log.i("onClose()", "Is from setIconified(): "+fromIconify);
        if(!fromIconify){
            mQuery = null;
            fromIconify = false;
        }
        return mCloseListener == null ? false : mCloseListener.onClose();
    }


}

在演示 Activity 中:

public class MainActivity extends Activity{

    private StatefulSearchView mSearchView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        getActionBar().setHomeButtonEnabled(true);
    }

    @Override
    public boolean onMenuItemSelected(int featureId, MenuItem item) {
      if(item.getItemId()==android.R.id.home) {
          mSearchView.setIconified(true);
          return true;
      }
        return super.onMenuItemSelected(featureId, item);
    }

    @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 item = menu.findItem(R.id.action_search);

         mSearchView =(StatefulSearchView)item.getActionView();
         mSearchView.setSaveSearchTextState(true);
         mSearchView.setOnStatefulQueryTextListener(new OnQueryTextListener(){

            @Override
            public boolean onQueryTextChange(String newText) {
                // TODO Auto-generated method stub
                return false;
            }

            @Override
            public boolean onQueryTextSubmit(String query) {
                // TODO Auto-generated method stub
                return false;
            }});
        return true;
    }

在菜单 xml 中:

<menu xmlns:android="http://schemas.android.com/apk/res/android" >

    <item
        android:id="@+id/action_search"
        android:orderInCategory="100"
        android:showAsAction="always"
        android:actionViewClass="com.nikola.despotoski.saveablesearchview.StatefulSearchView"
        android:title="@string/action_settings"/>

</menu>

在SearchView的来源中, 它清楚地表明他们将文本更改为 "":

@Override
    public void onActionViewCollapsed() {
        setQuery("", false);
        clearFocus();
        updateViewsVisibility(true);
        mQueryTextView.setImeOptions(mCollapsedImeOptions);
        mExpandedInActionView = false;
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public void onActionViewExpanded() {
        if (mExpandedInActionView) return;

        mExpandedInActionView = true;
        mCollapsedImeOptions = mQueryTextView.getImeOptions();
        mQueryTextView.setImeOptions(mCollapsedImeOptions | EditorInfo.IME_FLAG_NO_FULLSCREEN);
        mQueryTextView.setText("");
        setIconified(false);
    }

如果您有任何问题，请告诉我。