android實現搜尋功能並將搜尋結果儲存到SQLite中(例項程式碼)
阿新 • • 發佈：2020-04-23
執行結果：
涉及要點：
- ListView+EditText+ScrollView實現搜尋效果顯示
- 監聽軟鍵盤迴車執行搜尋
- 使用TextWatcher( )實時篩選
- 將搜尋內容儲存到SQLite中（可清空歷史記錄）
- 監聽EditText的焦點，獲得焦點彈出軟鍵盤同時顯示搜尋歷史，失去焦點隱藏軟體盤和ListView。
實現過程比較簡單，都是常用的，這裡就不講解了。程式碼可直接複製使用。
實現過程：
MainActivity.java
public class MainActivity extends Activity {
private EditText et_search;
private TextView tv_tip;
private MyListView listView;
private TextView tv_clear;
ScrollView scrollView;
private RecordSQLiteOpenHelper helper = new RecordSQLiteOpenHelper(this);
private SQLiteDatabase db;
private BaseAdapter adapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initView(); // 初始化控制元件
// 清空搜尋歷史
tv_clear.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
deleteData();
queryData("");
}
});
et_search.setOnKeyListener(new View.OnKeyListener() {// 輸入完後按鍵盤上的搜尋鍵
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
// 隱藏鍵盤
((InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE)).hideSoftInputFromWindow(
getCurrentFocus().getWindowToken(),InputMethodManager.HIDE_NOT_ALWAYS);
// 按完搜尋鍵後將當前查詢的關鍵字儲存起來,如果該關鍵字已經存在就不執行儲存
boolean hasData = hasData(et_search.getText().toString().trim());
if (!hasData) {
insertData(et_search.getText().toString().trim());
queryData("");
}
Toast.makeText(MainActivity.this,"點選軟鍵盤搜尋!",Toast.LENGTH_SHORT).show();
}
return false;
}
});
et_search.setOnFocusChangeListener(new View.OnFocusChangeListener() {
@Override
public void onFocusChange(View view,boolean b) {
if (b) { //獲得
scrollView.setVisibility(View.VISIBLE);
} else {//市區焦點
scrollView.setVisibility(View.GONE);
}
}
});
// 搜尋框的文字變化實時監聽
et_search.addTextChangedListener(new TextWatcher() {
@Override
public void beforeTextChanged(CharSequence s,int start,int count,int after) {
}
@Override
public void onTextChanged(CharSequence s,int before,int count) {
}
@Override
public void afterTextChanged(Editable s) {
if (s.toString().trim().length() == 0) {
tv_tip.setText("搜尋歷史");
} else {
tv_tip.setText("搜尋結果");
}
String tempName = et_search.getText().toString();
// 根據tempName去模糊查詢資料庫中有沒有資料
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();
((InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE)).hideSoftInputFromWindow(
getCurrentFocus().getWindowToken(),InputMethodManager.HIDE_NOT_ALWAYS); //隱藏軟鍵盤
et_search.clearFocus();
et_search.setText("");
}
});
// 插入測試資料
Date date = new Date();
long time = date.getTime();
insertData("LY" + time);
queryData(""); // 第一次進入查詢所有的歷史記錄
}
/**
* 插入資料
*/
private void insertData(String tempName) {
db = helper.getWritableDatabase();
db.execSQL("insert into records(name) values('" + tempName + "')");
db.close();
}
/**
* 模糊查詢資料
*/
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);
// 建立adapter介面卡物件
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);
// 設定介面卡
listView.setAdapter(adapter);
adapter.notifyDataSetChanged();
}
/**
* 檢查資料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();
}
/**
* 清空資料
*/
private void deleteData() {
db = helper.getWritableDatabase();
db.execSQL("delete from records");
db.close();
}
private void initView() {
et_search = (EditText) findViewById(R.id.et_search);
scrollView = findViewById(R.id.showSearch);
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左邊的搜尋按鈕的大小
Drawable drawable = getResources().getDrawable(R.drawable.search);
drawable.setBounds(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);// 只放左邊
}
}RecordSQLiteOpenHelper.java
public class RecordSQLiteOpenHelper extends SQLiteOpenHelper {
private static String name = "temp.db";
private static Integer version = 1;
public RecordSQLiteOpenHelper(Context context) {
super(context,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) {
}
}MyListView.java
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:focusable="true" android:focusableInTouchMode="true" android:orientation="vertical" tools:context=".MainActivity"> <LinearLayout android:layout_width="fill_parent" android:layout_height="50dp" android:background="#be9999" 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="fill_parent" android:layout_weight="264" 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:id="@+id/showSearch" android:layout_width="wrap_content" android:layout_height="300dp" android:visibility="gone"> <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="搜尋歷史" /> <View android:layout_width="match_parent" android:layout_height="1dp" android:background="#EEEEEE" /> <liyue.edu.cn.ncst.app.MyListView android:id="@+id/listView" android:layout_width="match_parent" android:layout_height="wrap_content" /> </LinearLayout> <View android:layout_width="match_parent" android:layout_height="1dp" android:background="#EEEEEE" /> <TextView android:id="@+id/tv_clear" android:layout_width="match_parent" android:layout_height="40dp" android:background="#F6F6F6" android:gravity="center" android:text="清除搜尋歷史" /> <View android:layout_width="match_parent" android:layout_height="1dp" android:layout_marginBottom="20dp" android:background="#EEEEEE" /> </LinearLayout> </ScrollView> </LinearLayout>
完整程式碼下載 demo
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