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android 实现 搜索保存历史记录功能_android计算器有历史保存功能代码

作者：IT小白 | 2024-08-05 00:15:57

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android计算器有历史保存功能代码

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：

  1. <AutoCompleteTextView 
  2.     android:layout_width="match_parent"
  3.     android:layout_height="wrap_content"
  4.     android:id="@+id/autotext"
  5.     />
  6.  
  7.  
  8. public class MainActivity extends Activity {
  9. private AutoCompleteTextView autotext;
  10. private ArrayAdapter<String> arrayAdapter;
  11.     @Override
  12.     protected void onCreate(Bundle savedInstanceState) {
  13.         super.onCreate(savedInstanceState);
  14.         setContentView(R.layout.test);
  15.  
  16.  
  17.         autotext =(AutoCompleteTextView) findViewById(R.id.autotext);
  18.         String [] arr={"aa","aab","aac"};
  19.         arrayAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1,arr);
  20.         autotext.setAdapter(arrayAdapter);
  21.     }
  22.  
  23. }


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 

  1. <pre name="code" class="java">public void save() {
  2.     String text = mKeywordEt.getText().toString();
  3.     String oldText = mSharePreference.getString(SEARCH_HISTORY, "");
  4.     StringBuilder builder = new StringBuilder(text);
  5.     builder.append("," + oldText);
  6.     if (!TextUtils.isEmpty(text) && !oldText.contains(text + ",")) {
  7.         SharedPreferences.Editor myEditor = mSharePreference.edit();
  8.         myEditor.putString(SEARCH_HISTORY, builder.toString());
  9.         myEditor.commit();
  10.     }
  11.     updateData();
  12. }
  13.  
  14.  
  15. //清空本地历史
  16. public void cleanHistory() {
  17.     SharedPreferences.Editor editor = mSharePreference.edit();
  18.     editor.clear();
  19.     editor.commit();
  20.     updateData();
  21.     mSearchHistoryLl.setVisibility(View.GONE);
  22.     SingleToast.show(this, getString(R.string.clear_history_success), Toast.LENGTH_SHORT);
  23. }




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

  1. <LinearLayout
  2.         android:id="@+id/search_history_ll"
  3.         android:orientation="vertical"
  4.         android:layout_width="match_parent"
  5.         android:layout_below="@id/global_search_action_bar_rl"
  6.         android:layout_height="wrap_content">
  7.         <TextView
  8.             android:id="@+id/contentTextView"
  9.             android:layout_width="wrap_content"
  10.             android:layout_height="wrap_content"
  11.             android:textSize="@dimen/text_size_title_h2"
  12.             android:text="@string/search_history"
  13.             android:paddingLeft="10dp"
  14.             android:textColor="@color/text_gray"/>
  15.         <ListView
  16.             android:id="@+id/search_history_lv"
  17.             android:layout_width="match_parent"
  18.             android:layout_height="wrap_content"
  19.             android:cacheColorHint="@android:color/transparent"
  20.             android:listSelector="@drawable/list_item_selector">
  21.         </ListView>
  22.         <Button
  23.             android:id="@+id/clear_history_btn"
  24.             android:layout_width="210dp"
  25.             android:layout_height="@dimen/button_common_height"
  26.             android:layout_below="@id/rise_crash_ll"
  27.             android:layout_marginTop="5dp"
  28.             android:textColor="@color/text_btn_selector"
  29.             android:layout_gravity="center"
  30.             android:textSize="@dimen/text_size_title_h2"
  31.             android:layout_centerHorizontal="true"
  32.             android:text="@string/clear_search_history"
  33.             android:background="@drawable/round_btn_selector"
  34.             style="?android:buttonBarButtonStyle"/>
  35.     </LinearLayout>
  36.  
  37.  
  38.  
  39.  
  40. activity 的代码
  41.  
  42.  
  43. import android.content.SharedPreferences;
  44. import android.os.Bundle;
  45. import android.text.Editable;
  46. import android.text.TextUtils;
  47. import android.text.TextWatcher;
  48. import android.view.View;
  49. import android.widget.AdapterView;
  50. import android.widget.ArrayAdapter;
  51. import android.widget.EditText;
  52. import android.widget.ImageView;
  53. import android.widget.LinearLayout;
  54. import android.widget.ListView;
  55. import android.widget.TextView;
  56. import android.widget.Toast;
  57.  
  58.  
  59. import com.ccvideo.R;
  60. import com.yizhibo.video.adapter.SearchAdapter;
  61. import com.yizhibo.video.app.YZBApplication;
  62. import com.yizhibo.video.base.BaseListActivity;
  63. import com.yizhibo.video.utils.Constants;
  64. import com.yizhibo.video.utils.SingleToast;
  65. import com.yizhibo.video.utils.Utils;
  66.  
  67.  
  68. public class SearchListActivity extends BaseListActivity implements View.OnClickListener {
  69.     public static final String EXTRA_KEY_TYPE = "extra_key_type";
  70.     private static final String PRE_SEARCH_HISTORY = "pre_search_history";
  71.     private static final String SEARCH_HISTORY = "search_history";
  72.  
  73.  
  74.     private EditText mKeywordEt;
  75.     private TextView mOperationTv;
  76.     private ArrayAdapter<String> mArrAdapter;
  77.     private SharedPreferences mSharePreference;
  78.  
  79.  
  80.     private LinearLayout mSearchHistoryLl;
  81.       private List<String> mHistoryKeywords;
  82.     private ListView mListView;
  83.     @Override
  84.     protected void onCreate(Bundle savedInstanceState) {
  85.         super.onCreate(savedInstanceState);
  86.         mSharePreference = YZBApplication.getApp().getSharedPreferences(PRE_SEARCH_HISTORY, 0);
  87.         setContentView(R.layout.activity_search_list);
  88.         mKeywordEt = (EditText) findViewById(R.id.tab_bar_keyword_et);
  89. mHistoryKeywords = new ArrayList<String>();
  90.  
  91.        mKeywordEt.addTextChangedListener(new TextWatcher() {
  92.             @Override
  93.             public void beforeTextChanged(CharSequence s, int start, int count, int after) {
  94.  
  95.  
  96.             }
  97.  
  98.  
  99.             @Override
  100.             public void onTextChanged(CharSequence s, int start, int before, int count) {
  101.                 if (s.length() == 0) {
  102.                     mAdapter.clear();
  103.                     mAdapter.notifyDataSetChanged();
  104.                     mOperationTv.setText(R.string.cancel);
  105.                     mEmptyView.hide();
  106.                     clearKeywordIv.setVisibility(View.GONE);
  107.                     if (mHistoryKeywords.size() > 0) {
  108.                         mSearchHistoryLl.setVisibility(View.VISIBLE);
  109.                     } else {
  110.                         mSearchHistoryLl.setVisibility(View.GONE);
  111.                     }
  112.                 } else {
  113.                     mSearchHistoryLl.setVisibility(View.GONE);
  114.                     mOperationTv.setText(R.string.search);
  115.                     clearKeywordIv.setVisibility(View.VISIBLE);
  116.                 }
  117.             }
  118.  
  119.  
  120.             @Override
  121.             public void afterTextChanged(Editable s) {
  122.  
  123.  
  124.             }
  125.         });
  126.         mKeywordEt.requestFocus();
  127.         mOperationTv = (TextView) findViewById(R.id.tab_bar_cancel_tv);
  128.         mOperationTv.setOnClickListener(new View.OnClickListener() {
  129.             @Override
  130.             public void onClick(View v) {
  131.                 if (mKeywordEt.getText().length() > 0) {
  132.                     hideInputMethod();
  133.                     save();
  134.                 } else {
  135.                     finish();
  136.                 }
  137.             }
  138.         });
  139.         initSearchHistory();
  140.        
  141.     }
  142.  
  143.    public void initSearchHistory() {
  144.         mSearchHistoryLl = (LinearLayout) findViewById(R.id.search_history_ll);
  145.         ListView listView = (ListView) findViewById(R.id.search_history_lv);
  146.         findViewById(R.id.clear_history_btn).setOnClickListener(this);
  147.         String history = mPref.getString(Preferences.KEY_SEARCH_HISTORY_KEYWORD);
  148.         if (!TextUtils.isEmpty(history)){
  149.             List<String> list = new ArrayList<String>();
  150.             for(Object o : history.split(",")) {
  151.                 list.add((String)o);
  152.             }
  153.             mHistoryKeywords = list;
  154.         }
  155.         if (mHistoryKeywords.size() > 0) {
  156.             mSearchHistoryLl.setVisibility(View.VISIBLE);
  157.         } else {
  158.             mSearchHistoryLl.setVisibility(View.GONE);
  159.         }
  160.         mArrAdapter = new ArrayAdapter<String>(this, R.layout.item_search_history, mHistoryKeywords);
  161.         listView.setAdapter(mArrAdapter);
  162.         listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
  163.             @Override
  164.             public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
  165.                 mKeywordEt.setText(mHistoryKeywords.get(i));
  166.                 mSearchHistoryLl.setVisibility(View.GONE);
  167.             }
  168.         });
  169.         mArrAdapter.notifyDataSetChanged();
  170.     }
  171.  
  172.     public void save() {
  173.         String text = mKeywordEt.getText().toString();
  174.         String oldText = mPref.getString(Preferences.KEY_SEARCH_HISTORY_KEYWORD);
  175.         if (!TextUtils.isEmpty(text) && !oldText.contains(text)) {
  176.             mPref.putString(Preferences.KEY_SEARCH_HISTORY_KEYWORD, text + "," + oldText);
  177.             mHistoryKeywords.add(0,text);
  178.         }
  179.         mArrAdapter.notifyDataSetChanged();
  180.     }
  181.  
  182.  
  183.   public void cleanHistory() {
  184.         mPref.remove(Preferences.KEY_SEARCH_HISTORY_KEYWORD);
  185.         mHistoryKeywords.clear();
  186.         mArrAdapter.notifyDataSetChanged();
  187.         mSearchHistoryLl.setVisibility(View.GONE);
  188.         SingleToast.show(this, getString(R.string.clear_history_success), Toast.LENGTH_SHORT);
  189.     }
  190.     public void updateData(){
  191.         String history = mSharePreference.getString(SEARCH_HISTORY, "");
  192.         mHistoryArr = history.split(",");
  193.         mArrAdapter = new ArrayAdapter<String>(this,
  194.                 R.layout.activity_searchhistory, mHistoryArr);
  195.         mListView.setAdapter(mArrAdapter);
  196.         mArrAdapter.notifyDataSetChanged();
  197.     }
  198.  
  199.  
  200.     @Override
  201.     public void onClick(View view) {
  202.         switch (view.getId()) {
  203.             case R.id.clear_history_btn:
  204.                 cleanHistory();
  205.                 break;
  206.         }
  207.     }
  208. }



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。

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