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：

public class MainActivity extends Activity {
private AutoCompleteTextView autotext;
private ArrayAdapter 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(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 

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 
  
 
  

        
        
        
        
    




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 mArrAdapter;
    private SharedPreferences mSharePreference;


    private LinearLayout mSearchHistoryLl;
      private List 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();

       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 list = new ArrayList();
            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(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(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。