本文實例為大家分享了Android實現搜索功能，并且需要顯示搜索的歷史記錄，供大家參考，具體內容如下
效果圖：
本案例實現起來很簡單，所以可以直接拿來嵌入項目中使用，涉及到的知識點：
- 數據庫的增刪改查操作
- ListView和ScrollView的嵌套沖突解決
- 監聽軟鍵盤回車按鈕設置為搜索按鈕
- 使用TextWatcher( )實時篩選
- 已搜索的關鍵字再次搜索不重復添加到數據庫
- 剛進入頁面設置軟鍵盤不因為EditText而自動彈出
代碼
RecordSQLiteOpenHelper.java
package com.cwvs.microlife;import android.content.Context;import android.database.sqlite.SQLiteDatabase;import android.database.sqlite.SQLiteOpenHelper;public class RecordSQLiteOpenHelper extends SQLiteOpenHelper { private static String name = "temp.db"; private static Integer version = 1; public RecordSQLiteOpenHelper(Context context) { super(context, name, null, version); } @Override public void onCreate(SQLiteDatabase db) { db.execSQL("create table records(id integer primary key autoincrement,name varchar(200))"); } @Override public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) { }}MainActivity.java
package com.cwvs.microlife;import java.util.Date;import android.app.Activity;import android.content.Context;import android.database.Cursor;import android.database.sqlite.SQLiteDatabase;import android.graphics.drawable.Drawable;import android.os.Bundle;import android.text.Editable;import android.text.TextWatcher;import android.view.KeyEvent;import android.view.View;import android.view.Window;import android.view.inputmethod.InputMethodManager;import android.widget.AdapterView;import android.widget.BaseAdapter;import android.widget.CursorAdapter;import android.widget.EditText;import android.widget.SimpleCursorAdapter;import android.widget.TextView;import android.widget.Toast;public class MainActivity extends Activity { private EditText et_search; private TextView tv_tip; private MyListView listView; private TextView tv_clear; private RecordSQLiteOpenHelper helper = new RecordSQLiteOpenHelper(this);; private SQLiteDatabase db; private BaseAdapter adapter; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); requestWindowFeature(Window.FEATURE_NO_TITLE); setContentView(R.layout.activity_main); // 初始化控件 initView(); // 清空搜索歷史 tv_clear.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { deleteData(); queryData(""); } }); // 搜索框的鍵盤搜索鍵點擊回調 et_search.setOnKeyListener(new View.OnKeyListener() {// 輸入完后按鍵盤上的搜索鍵 public boolean onKey(View v, int keyCode, KeyEvent event) { if (keyCode == KeyEvent.KEYCODE_ENTER && event.getAction() == KeyEvent.ACTION_DOWN) {// 修改回車鍵功能 // 先隱藏鍵盤 ((InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE)).hideSoftInputFromWindow( getCurrentFocus().getWindowToken(), InputMethodManager.HIDE_NOT_ALWAYS); // 按完搜索鍵后將當前查詢的關鍵字保存起來,如果該關鍵字已經存在就不執行保存 boolean hasData = hasData(et_search.getText().toString().trim()); if (!hasData) { insertData(et_search.getText().toString().trim()); queryData(""); } // TODO 根據輸入的內容模糊查詢商品，并跳轉到另一個界面，由你自己去實現 Toast.makeText(MainActivity.this, "clicked!", Toast.LENGTH_SHORT).show(); } return false; } }); // 搜索框的文本變化實時監聽 et_search.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) { } @Override public void afterTextChanged(Editable s) { if (s.toString().trim().length() == 0) { tv_tip.setText("搜索歷史"); } else { tv_tip.setText("搜索結果"); } String tempName = et_search.getText().toString(); // 根據tempName去模糊查詢數據庫中有沒有數據 queryData(tempName); } }); listView.setOnItemClickListener(new AdapterView.OnItemClickListener() { @Override public void onItemClick(AdapterView<?> parent, View view, int position, long id) { TextView textView = (TextView) view.findViewById(android.R.id.text1); String name = textView.getText().toString(); et_search.setText(name); Toast.makeText(MainActivity.this, name, Toast.LENGTH_SHORT).show(); // TODO 獲取到item上面的文字，根據該關鍵字跳轉到另一個頁面查詢，由你自己去實現 } }); // 插入數據，便于測試，否則第一次進入沒有數據怎么測試呀？ Date date = new Date(); long time = date.getTime(); insertData("Leo" + time); // 第一次進入查詢所有的歷史記錄 queryData(""); } /** * 插入數據 */ private void insertData(String tempName) { db = helper.getWritableDatabase(); db.execSQL("insert into records(name) values('" + tempName + "')"); db.close(); } /** * 模糊查詢數據 */ private void queryData(String tempName) { Cursor cursor = helper.getReadableDatabase().rawQuery( "select id as _id,name from records where name like '%" + tempName + "%' order by id desc ", null); // 創建adapter適配器對象 adapter = new SimpleCursorAdapter(this, android.R.layout.simple_list_item_1, cursor, new String[] { "name" }, new int[] { android.R.id.text1 }, CursorAdapter.FLAG_REGISTER_CONTENT_OBSERVER); // 設置適配器 listView.setAdapter(adapter); adapter.notifyDataSetChanged(); } /** * 檢查數據庫中是否已經有該條記錄 */ private boolean hasData(String tempName) { Cursor cursor = helper.getReadableDatabase().rawQuery( "select id as _id,name from records where name =?", new String[]{tempName}); //判斷是否有下一個 return cursor.moveToNext(); } /** * 清空數據 */ private void deleteData() { db = helper.getWritableDatabase(); db.execSQL("delete from records"); db.close(); } private void initView() { et_search = (EditText) findViewById(R.id.et_search); tv_tip = (TextView) findViewById(R.id.tv_tip); listView = (com.cwvs.microlife.MyListView) findViewById(R.id.listView); tv_clear = (TextView) findViewById(R.id.tv_clear); // 調整EditText左邊的搜索按鈕的大小 Drawable drawable = getResources().getDrawable(R.drawable.search); drawable.setBounds(0, 0, 60, 60);// 第一0是距左邊距離，第二0是距上邊距離，60分別是長寬 et_search.setCompoundDrawables(drawable, null, null, null);// 只放左邊 }}MyListView.java
package com.cwvs.microlife;import android.content.Context;import android.util.AttributeSet;import android.widget.ListView;public class MyListView extends ListView { public MyListView(Context context) { super(context); } public MyListView(Context context, AttributeSet attrs) { super(context, attrs); } public MyListView(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); } @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { int expandSpec = MeasureSpec.makeMeasureSpec(Integer.MAX_VALUE >> 2, MeasureSpec.AT_MOST); super.onMeasure(widthMeasureSpec, expandSpec); }}activity_main.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:focusableInTouchMode="true" android:orientation="vertical" tools:context="${relativePackage}.${activityClass}"> <LinearLayout android:layout_width="fill_parent" android:layout_height="50dp" android:background="#E54141" android:orientation="horizontal" android:paddingRight="16dp"> <ImageView android:layout_width="45dp" android:layout_height="45dp" android:layout_gravity="center_vertical" android:padding="10dp" android:src="@drawable/back" /> <EditText android:id="@+id/et_search" android:layout_width="0dp" android:layout_height="match_parent" android:layout_weight="1" android:background="@null" android:drawableLeft="@drawable/search" android:drawablePadding="8dp" android:gravity="start|center_vertical" android:hint="輸入查詢的關鍵字" android:imeOptions="actionSearch" android:singleLine="true" android:textColor="@android:color/white" android:textSize="16sp" /> </LinearLayout> <ScrollView android:layout_width="wrap_content" android:layout_height="wrap_content"> <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="vertical"> <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="vertical" android:paddingLeft="20dp" > <TextView android:id="@+id/tv_tip" android:layout_width="match_parent" android:layout_height="50dp" android:gravity="left|center_vertical" android:text="搜索歷史" /> <View android:layout_width="match_parent" android:layout_height="1dp" android:background="#EEEEEE"></View> <com.cwvs.microlife.MyListView android:id="@+id/listView" android:layout_width="match_parent" android:layout_height="wrap_content"></com.cwvs.microlife.MyListView> </LinearLayout> <View android:layout_width="match_parent" android:layout_height="1dp" android:background="#EEEEEE"></View> <TextView android:id="@+id/tv_clear" android:layout_width="match_parent" android:layout_height="40dp" android:background="#F6F6F6" android:gravity="center" android:text="清除搜索歷史" /> <View android:layout_width="match_parent" android:layout_height="1dp" android:layout_marginBottom="20dp" android:background="#EEEEEE"></View> </LinearLayout> </ScrollView></LinearLayout>以上就是本文的全部內容，希望對大家的學習有所幫助。
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