2013.12.03（9） ——— android ActionbarSherlockSample之SearchViews

2013.12.03（2） ——— android ActionbarSherlockSample之SearchViews

/* * Copyright (C) 2011 Jake Wharton * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * *      http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */package com.actionbarsherlock.sample.demos;import android.app.SearchManager;import android.content.Context;import android.database.Cursor;import android.database.MatrixCursor;import android.os.Bundle;import android.provider.BaseColumns;import android.support.v4.widget.CursorAdapter;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.TextView;import android.widget.Toast;import com.actionbarsherlock.app.SherlockActivity;import com.actionbarsherlock.view.Menu;import com.actionbarsherlock.view.MenuItem;import com.actionbarsherlock.widget.SearchView;public class SearchViews extends SherlockActivity implements SearchView.OnQueryTextListener,        SearchView.OnSuggestionListener {    private static final String[] COLUMNS = {            BaseColumns._ID,            SearchManager.SUGGEST_COLUMN_TEXT_1,    };    private SuggestionsAdapter mSuggestionsAdapter;    @Override    public boolean onCreateOptionsMenu(Menu menu) {        //Used to put dark icons on light action bar        boolean isLight = SampleList.THEME == R.style.Theme_Sherlock_Light;        //Create the search view        SearchView searchView = new SearchView(getSupportActionBar().getThemedContext());        searchView.setQueryHint("Search for countries…");        searchView.setOnQueryTextListener(this);        searchView.setOnSuggestionListener(this);        if (mSuggestionsAdapter == null) {            MatrixCursor cursor = new MatrixCursor(COLUMNS);            cursor.addRow(new String[]{"1", "'Murica"});            cursor.addRow(new String[]{"2", "Canada"});            cursor.addRow(new String[]{"3", "Denmark"});            mSuggestionsAdapter = new SuggestionsAdapter(getSupportActionBar().getThemedContext(), cursor);        }        searchView.setSuggestionsAdapter(mSuggestionsAdapter);        menu.add("Search")            .setIcon(isLight ? R.drawable.ic_search_inverse : R.drawable.abs__ic_search)            .setActionView(searchView)            .setShowAsAction(MenuItem.SHOW_AS_ACTION_IF_ROOM | MenuItem.SHOW_AS_ACTION_COLLAPSE_ACTION_VIEW);        return true;    }    @Override    protected void onCreate(Bundle savedInstanceState) {        setTheme(SampleList.THEME); //Used for theme switching in samples        super.onCreate(savedInstanceState);        setContentView(R.layout.text);        ((TextView)findViewById(R.id.text)).setText(R.string.search_views_content);    }    @Override    public boolean onQueryTextSubmit(String query) {    System.out.println("onQueryTextSubmit");        Toast.makeText(this, "You searched for: " + query, Toast.LENGTH_LONG).show();        return true;    }    @Override    public boolean onQueryTextChange(String newText) {    System.out.println("onQueryTextChange");        return false;    }    @Override    public boolean onSuggestionSelect(int position) {    System.out.println("onSuggestionSelect");        return false;    }    @Override    public boolean onSuggestionClick(int position) {    System.out.println("onSuggestionClick");        Cursor c = (Cursor) mSuggestionsAdapter.getItem(position);        String query = c.getString(c.getColumnIndex(SearchManager.SUGGEST_COLUMN_TEXT_1));        Toast.makeText(this, "Suggestion clicked: " + query, Toast.LENGTH_LONG).show();        return true;    }    private class SuggestionsAdapter extends CursorAdapter {        public SuggestionsAdapter(Context context, Cursor c) {            super(context, c, 0);        }        @Override        public View newView(Context context, Cursor cursor, ViewGroup parent) {            LayoutInflater inflater = LayoutInflater.from(context);            View v = inflater.inflate(android.R.layout.simple_list_item_1, parent, false);            return v;        }        @Override        public void bindView(View view, Context context, Cursor cursor) {            TextView tv = (TextView) view;            final int textIndex = cursor.getColumnIndex(SearchManager.SUGGEST_COLUMN_TEXT_1);            tv.setText(cursor.getString(textIndex));        }    }}

CursorAdapter的3个方法getView，bindView和newView 是我们容易迷惑的方法，下面我们来看看源码

/** * @see android.widget.ListAdapter#getView(int, View, ViewGroup) */public View getView(int position, View convertView, ViewGroup parent) {    if (!mDataValid) {        throw new IllegalStateException("this should only be called when the cursor is valid");    }    if (!mCursor.moveToPosition(position)) {        throw new IllegalStateException("couldn't move cursor to position " + position);    }    View v;    if (convertView == null) {        v = newView(mContext, mCursor, parent);    } else {        v = convertView;    }    bindView(v, mContext, mCursor);    return v;}

我们明白了，原来getView首先使用已经存在的View，如果没有就调用newView 产生一个，然后把数据bind上去。
三者的调用顺序为：
getView——>newView——>bindView

关于searchview的过滤功能，可以参考apidemos->view->SearchViewFilterMode

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