android 实现 搜索保存历史记录功能
【摘要】
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" ...
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：
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<AutoCompleteTextView
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android:layout_width="match_parent"
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android:layout_height="wrap_content"
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android:id="@+id/autotext"
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/>
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public class MainActivity extends Activity {
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private AutoCompleteTextView autotext;
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private ArrayAdapter<String> arrayAdapter;
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@Override
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protected void onCreate(Bundle savedInstanceState) {
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super.onCreate(savedInstanceState);
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setContentView(R.layout.test);
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autotext =(AutoCompleteTextView) findViewById(R.id.autotext);
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String [] arr={"aa","aab","aac"};
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arrayAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1,arr);
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autotext.setAdapter(arrayAdapter);
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}
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}
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
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<pre name="code" class="java">public void save() {
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String text = mKeywordEt.getText().toString();
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String oldText = mSharePreference.getString(SEARCH_HISTORY, "");
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StringBuilder builder = new StringBuilder(text);
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builder.append("," + oldText);
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if (!TextUtils.isEmpty(text) && !oldText.contains(text + ",")) {
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SharedPreferences.Editor myEditor = mSharePreference.edit();
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myEditor.putString(SEARCH_HISTORY, builder.toString());
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myEditor.commit();
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}
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updateData();
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}
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//清空本地历史
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public void cleanHistory() {
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SharedPreferences.Editor editor = mSharePreference.edit();
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editor.clear();
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editor.commit();
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updateData();
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mSearchHistoryLl.setVisibility(View.GONE);
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SingleToast.show(this, getString(R.string.clear_history_success), Toast.LENGTH_SHORT);
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}
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
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<LinearLayout
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android:id="@+id/search_history_ll"
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android:orientation="vertical"
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android:layout_width="match_parent"
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android:layout_below="@id/global_search_action_bar_rl"
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android:layout_height="wrap_content">
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<TextView
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android:id="@+id/contentTextView"
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android:layout_width="wrap_content"
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android:layout_height="wrap_content"
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android:textSize="@dimen/text_size_title_h2"
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android:text="@string/search_history"
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android:paddingLeft="10dp"
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android:textColor="@color/text_gray"/>
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<ListView
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android:id="@+id/search_history_lv"
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android:layout_width="match_parent"
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android:layout_height="wrap_content"
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android:cacheColorHint="@android:color/transparent"
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android:listSelector="@drawable/list_item_selector">
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</ListView>
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<Button
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android:id="@+id/clear_history_btn"
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android:layout_width="210dp"
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android:layout_height="@dimen/button_common_height"
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android:layout_below="@id/rise_crash_ll"
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android:layout_marginTop="5dp"
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android:textColor="@color/text_btn_selector"
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android:layout_gravity="center"
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android:textSize="@dimen/text_size_title_h2"
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android:layout_centerHorizontal="true"
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android:text="@string/clear_search_history"
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android:background="@drawable/round_btn_selector"
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style="?android:buttonBarButtonStyle"/>
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</LinearLayout>
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activity 的代码
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import android.content.SharedPreferences;
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import android.os.Bundle;
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import android.text.Editable;
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import android.text.TextUtils;
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import android.text.TextWatcher;
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import android.view.View;
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import android.widget.AdapterView;
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import android.widget.ArrayAdapter;
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import android.widget.EditText;
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import android.widget.ImageView;
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import android.widget.LinearLayout;
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import android.widget.ListView;
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import android.widget.TextView;
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import android.widget.Toast;
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import com.ccvideo.R;
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import com.yizhibo.video.adapter.SearchAdapter;
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import com.yizhibo.video.app.YZBApplication;
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import com.yizhibo.video.base.BaseListActivity;
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import com.yizhibo.video.utils.Constants;
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import com.yizhibo.video.utils.SingleToast;
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import com.yizhibo.video.utils.Utils;
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public class SearchListActivity extends BaseListActivity implements View.OnClickListener {
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public static final String EXTRA_KEY_TYPE = "extra_key_type";
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private static final String PRE_SEARCH_HISTORY = "pre_search_history";
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private static final String SEARCH_HISTORY = "search_history";
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private EditText mKeywordEt;
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private TextView mOperationTv;
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private ArrayAdapter<String> mArrAdapter;
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private SharedPreferences mSharePreference;
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private LinearLayout mSearchHistoryLl;
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private List<String> mHistoryKeywords;
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private ListView mListView;
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@Override
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protected void onCreate(Bundle savedInstanceState) {
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super.onCreate(savedInstanceState);
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mSharePreference = YZBApplication.getApp().getSharedPreferences(PRE_SEARCH_HISTORY, 0);
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setContentView(R.layout.activity_search_list);
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mKeywordEt = (EditText) findViewById(R.id.tab_bar_keyword_et);
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mHistoryKeywords = new ArrayList<String>();
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mKeywordEt.addTextChangedListener(new TextWatcher() {
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@Override
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public void beforeTextChanged(CharSequence s, int start, int count, int after) {
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}
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@Override
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public void onTextChanged(CharSequence s, int start, int before, int count) {
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if (s.length() == 0) {
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mAdapter.clear();
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mAdapter.notifyDataSetChanged();
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mOperationTv.setText(R.string.cancel);
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mEmptyView.hide();
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clearKeywordIv.setVisibility(View.GONE);
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if (mHistoryKeywords.size() > 0) {
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mSearchHistoryLl.setVisibility(View.VISIBLE);
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} else {
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mSearchHistoryLl.setVisibility(View.GONE);
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}
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} else {
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mSearchHistoryLl.setVisibility(View.GONE);
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mOperationTv.setText(R.string.search);
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clearKeywordIv.setVisibility(View.VISIBLE);
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}
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}
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@Override
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public void afterTextChanged(Editable s) {
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}
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});
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mKeywordEt.requestFocus();
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mOperationTv = (TextView) findViewById(R.id.tab_bar_cancel_tv);
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mOperationTv.setOnClickListener(new View.OnClickListener() {
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@Override
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public void onClick(View v) {
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if (mKeywordEt.getText().length() > 0) {
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hideInputMethod();
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save();
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} else {
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finish();
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}
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}
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});
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initSearchHistory();
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}
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public void initSearchHistory() {
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mSearchHistoryLl = (LinearLayout) findViewById(R.id.search_history_ll);
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ListView listView = (ListView) findViewById(R.id.search_history_lv);
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findViewById(R.id.clear_history_btn).setOnClickListener(this);
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String history = mPref.getString(Preferences.KEY_SEARCH_HISTORY_KEYWORD);
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if (!TextUtils.isEmpty(history)){
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List<String> list = new ArrayList<String>();
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for(Object o : history.split(",")) {
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list.add((String)o);
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}
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mHistoryKeywords = list;
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}
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if (mHistoryKeywords.size() > 0) {
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mSearchHistoryLl.setVisibility(View.VISIBLE);
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} else {
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mSearchHistoryLl.setVisibility(View.GONE);
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}
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mArrAdapter = new ArrayAdapter<String>(this, R.layout.item_search_history, mHistoryKeywords);
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listView.setAdapter(mArrAdapter);
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listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
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@Override
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public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
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mKeywordEt.setText(mHistoryKeywords.get(i));
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mSearchHistoryLl.setVisibility(View.GONE);
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}
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});
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mArrAdapter.notifyDataSetChanged();
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}
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public void save() {
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String text = mKeywordEt.getText().toString();
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String oldText = mPref.getString(Preferences.KEY_SEARCH_HISTORY_KEYWORD);
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if (!TextUtils.isEmpty(text) && !oldText.contains(text)) {
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mPref.putString(Preferences.KEY_SEARCH_HISTORY_KEYWORD, text + "," + oldText);
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mHistoryKeywords.add(0,text);
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}
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mArrAdapter.notifyDataSetChanged();
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}
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public void cleanHistory() {
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mPref.remove(Preferences.KEY_SEARCH_HISTORY_KEYWORD);
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mHistoryKeywords.clear();
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mArrAdapter.notifyDataSetChanged();
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mSearchHistoryLl.setVisibility(View.GONE);
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SingleToast.show(this, getString(R.string.clear_history_success), Toast.LENGTH_SHORT);
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}
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public void updateData(){
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String history = mSharePreference.getString(SEARCH_HISTORY, "");
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mHistoryArr = history.split(",");
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mArrAdapter = new ArrayAdapter<String>(this,
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R.layout.activity_searchhistory, mHistoryArr);
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mListView.setAdapter(mArrAdapter);
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mArrAdapter.notifyDataSetChanged();
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}
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@Override
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public void onClick(View view) {
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switch (view.getId()) {
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case R.id.clear_history_btn:
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cleanHistory();
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break;
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}
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}
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}
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
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