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。

android 实现 搜索保存历史记录功能

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