android 实现 搜索保存历史记录功能

大家应该做这个功能 首先想到的是用AutoCompleteTextView 这个控件非常好用 ，而且代码写起来也是非常简单 而且还是自动匹配提示

具体实现方法：

代码实现：

      <AutoCompleteTextView
          android:layout_width="match_parent"
          android:layout_height="wrap_content"
          android:id="@+id/autotext"
          />
      public class MainActivity extends Activity {
      private AutoCompleteTextView autotext;
      private ArrayAdapter<String> arrayAdapter;
         @Override
         protected void onCreate(Bundle savedInstanceState) {
             super.onCreate(savedInstanceState);
              setContentView(R.layout.test);
              autotext =(AutoCompleteTextView) findViewById(R.id.autotext);
              String [] arr={"aa","aab","aac"};
              arrayAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1,arr);
              autotext.setAdapter(arrayAdapter);
          }
      }
  
 

这样就可以实现简单的 搜索历史匹配 我们要做的 其实就是缓存输入的内容到 本地 下面就是实现保存 搜索内容到本地 和 清空本地历史的 方法


//保存搜索内容到本地 

      <pre name="code" class="java">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);
      }
  
 

Ps:AutoCompleteTextView 还有一个小问题  默认是从第二个字符开始匹配的 
如果设置输入第一个字符就进行提示 加入下面这行代码autotext.setThreshold(1); 
上面大概介绍了一下AutoCompleteTextView这个控件。但是我们的项目要做的是 显示出所有搜索的历史记录 效果图是这样的






想了一下 用 AutoCompleteTextView 不太合适  决定自己用listView 实现  话不多说 直接上代码
下拉弹出layout布局

      <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_h2"
                  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_h2"
                  android:layout_centerHorizontal="true"
                  android:text="@string/clear_search_history"
                  android:background="@drawable/round_btn_selector"
                  style="?android:buttonBarButtonStyle"/>
          </LinearLayout>
      activity 的代码
      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<?> 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;
              }
          }
      }
  
 

之前的这个demo里面少了share  commit的操作，导致会有搜索记录没有去重的问题，已经更新。附上新的源码下载地址  源码demo  ，同时谢谢ysc123shift同学的善意提醒！做技术互相帮助和分享很重要。谢谢！


效果图就是上面的图片。希望能帮到大家。 欢迎大家加入我的qq 群：454430053。

文章来源: wukong.blog.csdn.net，作者：再见孙悟空_，版权归原作者所有，如需转载，请联系作者。

原文链接：wukong.blog.csdn.net/article/details/50427194