运行结果：
涉及要点：
- ListView+EditText+ScrollView实现搜索效果显示
- 监听软键盘回车执行搜索
- 使用TextWatcher( )实时筛选
- 将搜索内容存储到SQLite中（可清空历史记录）
- 监听EditText的焦点，获得焦点弹出软键盘同时显示搜索历史，失去焦点隐藏软件盘和ListView。
实现过程比较简单，都是常用的，这里就不讲解了。代码可直接复制使用。
实现过程：
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(); // 初始化控件
// 清空搜索历史
tv_clear.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
deleteData();
queryData("");
}
});
et_search.setOnKeyListener(new View.OnKeyListener() {// 输入完后按键盘上的搜索键
public boolean onKey(View v, int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_ENTER && event.getAction() == KeyEvent.ACTION_DOWN) {// 修改回车键功能
// 隐藏键盘
((InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE)).hideSoftInputFromWindow(
getCurrentFocus().getWindowToken(), InputMethodManager.HIDE_NOT_ALWAYS);
// 按完搜索键后将当前查询的关键字保存起来,如果该关键字已经存在就不执行保存
boolean hasData = hasData(et_search.getText().toString().trim());
if (!hasData) {
insertData(et_search.getText().toString().trim());
queryData("");
}
Toast.makeText(MainActivity.this, "点击软键盘搜索!", Toast.LENGTH_SHORT).show();
}
return false;
}
});
et_search.setOnFocusChangeListener(new View.OnFocusChangeListener() {
@Override
public void onFocusChange(View view, boolean b) {
if (b) { //获得
scrollView.setVisibility(View.VISIBLE);
} else {//市区焦点
scrollView.setVisibility(View.GONE);
}
}
});
// 搜索框的文本变化实时监听
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("搜索历史");
} else {
tv_tip.setText("搜索结果");
}
String tempName = et_search.getText().toString();
// 根据tempName去模糊查询数据库中有没有数据
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); //隐藏软键盘
et_search.clearFocus();
et_search.setText("");
}
});
// 插入测试数据
Date date = new Date();
long time = date.getTime();
insertData("LY" + time);
queryData(""); // 第一次进入查询所有的历史记录
}
/**
* 插入数据
*/
private void insertData(String tempName) {
db = helper.getWritableDatabase();
db.execSQL("insert into records(name) values('" + tempName + "')");
db.close();
}
/**
* 模糊查询数据
*/
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);
// 创建adapter适配器对象
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);
// 设置适配器
listView.setAdapter(adapter);
adapter.notifyDataSetChanged();
}
/**
* 检查数据库中是否已经有该条记录
*/
private boolean hasData(String tempName) {
Cursor cursor = helper.getReadableDatabase().rawQuery(
"select id as _id,name from records where name =?", new String[]{tempName});
//判断是否有下一个
return cursor.moveToNext();
}
/**
* 清空数据
*/
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);
// 调整EditText左边的搜索按钮的大小
Drawable drawable = getResources().getDrawable(R.drawable.search);
drawable.setBounds(0, 0, 60, 60);// 第一0是距左边距离，第二0是距上边距离，60分别是长宽
et_search.setCompoundDrawables(drawable, null, null, null);// 只放左边
}
}
RecordSQLiteOpenHelper.java
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) {
}
}
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="输入查询的关键字" 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="搜索历史" /> <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="清除搜索历史" /> <View android:layout_width="match_parent" android:layout_height="1dp" android:layout_marginBottom="20dp" android:background="#EEEEEE" /> </LinearLayout> </ScrollView> </LinearLayout>
完整代码下载 demo
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