Android应用中怎么实现一个搜索记录保存功能

public void save() { 
  String text = mKeywordEt.getText().toString(); 
  String oldText = mSharePreference.getString(SEARCH_HISTORY, ""); 
  StringBuilder builder = new StringBuilder(text); 
  builder.append("," + oldText); 
  if (!TextUtils.isEmpty(text) && !oldText.contains(text + ",")) { 
    SharedPreferences.Editor myEditor = mSharePreference.edit(); 
    myEditor.putString(SEARCH_HISTORY, builder.toString()); 
    myEditor.commit(); 
  } 
  updateData(); 
} 
  
  
//清空本地历史 
public void cleanHistory() { 
  SharedPreferences.Editor editor = mSharePreference.edit(); 
  editor.clear(); 
  editor.commit(); 
  updateData(); 
  mSearchHistoryLl.setVisibility(View.GONE); 
  SingleToast.show(this, getString(R.string.clear_history_success), Toast.LENGTH_SHORT); 
} 

import android.content.SharedPreferences; 
import android.os.Bundle; 
import android.text.Editable; 
import android.text.TextUtils; 
import android.text.TextWatcher; 
import android.view.View; 
import android.widget.AdapterView; 
import android.widget.ArrayAdapter; 
import android.widget.EditText; 
import android.widget.ImageView; 
import android.widget.LinearLayout; 
import android.widget.ListView; 
import android.widget.TextView; 
import android.widget.Toast; 
 
 
import com.ccvideo.R; 
import com.yizhibo.video.adapter.SearchAdapter; 
import com.yizhibo.video.app.YZBApplication; 
import com.yizhibo.video.base.BaseListActivity; 
import com.yizhibo.video.utils.Constants; 
import com.yizhibo.video.utils.SingleToast; 
import com.yizhibo.video.utils.Utils; 
 
 
public class SearchListActivity extends BaseListActivity implements View.OnClickListener { 
  public static final String EXTRA_KEY_TYPE = "extra_key_type"; 
  private static final String PRE_SEARCH_HISTORY = "pre_search_history"; 
  private static final String SEARCH_HISTORY = "search_history"; 
 
 
  private EditText mKeywordEt; 
  private TextView mOperationTv; 
  private ArrayAdapter<String> mArrAdapter; 
  private SharedPreferences mSharePreference; 
 
 
  private LinearLayout mSearchHistoryLl; 
   private List<String> mHistoryKeywords; 
  private ListView mListView; 
  @Override 
  protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    mSharePreference = YZBApplication.getApp().getSharedPreferences(PRE_SEARCH_HISTORY, 0); 
    setContentView(R.layout.activity_search_list); 
    mKeywordEt = (EditText) findViewById(R.id.tab_bar_keyword_et); 
mHistoryKeywords = new ArrayList<String>(); 
 
    mKeywordEt.addTextChangedListener(new TextWatcher() { 
      @Override 
      public void beforeTextChanged(CharSequence s, int start, int count, int after) { 
 
 
      } 
 
 
      @Override 
      public void onTextChanged(CharSequence s, int start, int before, int count) { 
        if (s.length() == 0) { 
          mAdapter.clear(); 
          mAdapter.notifyDataSetChanged(); 
          mOperationTv.setText(R.string.cancel); 
          mEmptyView.hide(); 
          clearKeywordIv.setVisibility(View.GONE); 
          if (mHistoryKeywords.size() > 0) { 
            mSearchHistoryLl.setVisibility(View.VISIBLE); 
          } else { 
            mSearchHistoryLl.setVisibility(View.GONE); 
          } 
        } else { 
          mSearchHistoryLl.setVisibility(View.GONE); 
          mOperationTv.setText(R.string.search); 
          clearKeywordIv.setVisibility(View.VISIBLE); 
        } 
      } 
 
 
      @Override 
      public void afterTextChanged(Editable s) { 
 
 
      } 
    }); 
    mKeywordEt.requestFocus(); 
    mOperationTv = (TextView) findViewById(R.id.tab_bar_cancel_tv); 
    mOperationTv.setOnClickListener(new View.OnClickListener() { 
      @Override 
      public void onClick(View v) { 
        if (mKeywordEt.getText().length() > 0) { 
          hideInputMethod(); 
          save(); 
        } else { 
          finish(); 
        } 
      } 
    }); 
    initSearchHistory(); 
     
  } 
 
  public void initSearchHistory() { 
    mSearchHistoryLl = (LinearLayout) findViewById(R.id.search_history_ll); 
    ListView listView = (ListView) findViewById(R.id.search_history_lv); 
    findViewById(R.id.clear_history_btn).setOnClickListener(this); 
    String history = mPref.getString(Preferences.KEY_SEARCH_HISTORY_KEYWORD); 
    if (!TextUtils.isEmpty(history)){ 
      List<String> list = new ArrayList<String>(); 
      for(Object o : history.split(",")) { 
        list.add((String)o); 
      } 
      mHistoryKeywords = list; 
    } 
    if (mHistoryKeywords.size() > 0) { 
      mSearchHistoryLl.setVisibility(View.VISIBLE); 
    } else { 
      mSearchHistoryLl.setVisibility(View.GONE); 
    } 
    mArrAdapter = new ArrayAdapter<String>(this, R.layout.item_search_history, mHistoryKeywords); 
    listView.setAdapter(mArrAdapter); 
    listView.setOnItemClickListener(new AdapterView.OnItemClickListener() { 
      @Override 
      public void onItemClick(AdapterView<&#63;> adapterView, View view, int i, long l) { 
        mKeywordEt.setText(mHistoryKeywords.get(i)); 
        mSearchHistoryLl.setVisibility(View.GONE); 
      } 
    }); 
    mArrAdapter.notifyDataSetChanged(); 
  } 
 
  public void save() { 
    String text = mKeywordEt.getText().toString(); 
    String oldText = mPref.getString(Preferences.KEY_SEARCH_HISTORY_KEYWORD); 
    if (!TextUtils.isEmpty(text) && !oldText.contains(text)) { 
      mPref.putString(Preferences.KEY_SEARCH_HISTORY_KEYWORD, text + "," + oldText); 
      mHistoryKeywords.add(0,text); 
    } 
    mArrAdapter.notifyDataSetChanged(); 
  } 
 
 
 public void cleanHistory() { 
    mPref.remove(Preferences.KEY_SEARCH_HISTORY_KEYWORD); 
    mHistoryKeywords.clear(); 
    mArrAdapter.notifyDataSetChanged(); 
    mSearchHistoryLl.setVisibility(View.GONE); 
    SingleToast.show(this, getString(R.string.clear_history_success), Toast.LENGTH_SHORT); 
  } 
  public void updateData(){ 
    String history = mSharePreference.getString(SEARCH_HISTORY, ""); 
    mHistoryArr = history.split(","); 
    mArrAdapter = new ArrayAdapter<String>(this, 
        R.layout.activity_searchhistory, mHistoryArr); 
    mListView.setAdapter(mArrAdapter); 
    mArrAdapter.notifyDataSetChanged(); 
  } 
 
 
  @Override 
  public void onClick(View view) { 
    switch (view.getId()) { 
      case R.id.clear_history_btn: 
        cleanHistory(); 
        break; 
    } 
  } 
} 

<LinearLayout 
    android:id="@+id/search_history_ll" 
    android:orientation="vertical" 
    android:layout_width="match_parent" 
    android:layout_below="@id/global_search_action_bar_rl" 
    android:layout_height="wrap_content"> 
    <TextView 
      android:id="@+id/contentTextView" 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:textSize="@dimen/text_size_title_h3" 
      android:text="@string/search_history" 
      android:paddingLeft="10dp" 
      android:textColor="@color/text_gray"/> 
    <ListView 
      android:id="@+id/search_history_lv" 
      android:layout_width="match_parent" 
      android:layout_height="wrap_content" 
      android:cacheColorHint="@android:color/transparent" 
      android:listSelector="@drawable/list_item_selector"> 
    </ListView> 
    <Button 
      android:id="@+id/clear_history_btn" 
      android:layout_width="210dp" 
      android:layout_height="@dimen/button_common_height" 
      android:layout_below="@id/rise_crash_ll" 
      android:layout_marginTop="5dp" 
      android:textColor="@color/text_btn_selector" 
      android:layout_gravity="center" 
      android:textSize="@dimen/text_size_title_h3" 
      android:layout_centerHorizontal="true" 
      android:text="@string/clear_search_history" 
      android:background="@drawable/round_btn_selector" 
      /> 
  </LinearLayout>