SearchView的基本使用
SearchView是android系统中内置的一个搜索框组件，可以很方便在添加在用户界面之上，但是也带来了一些问题，那就是searchview的UI是固定的，定制起来会很麻烦，如果对SearchView的要求比较高，完全可以采用button和EditText自己实现。这里先简单的说说SearchView的使用：
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:orientation="vertical"
tools:context=".Main" >
<SearchView
android:id="@+id/sv"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:imeOptions="actionGo" />
</LinearLayout>
在显示suggestion的时候会用到下面的布局文件:mytextview.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="50sp"
android:orientation="vertical" >
<TextView
android:id="@+id/textview"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center_vertical"
android:paddingLeft="5sp"
android:textSize="18sp" />
</LinearLayout>
main.java:
package com.app.main;
import java.lang.reflect.Field;
import android.app.Activity;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.os.Bundle;
import android.view.View;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.SearchView;
import android.widget.SearchView.OnQueryTextListener;
import android.widget.SimpleCursorAdapter;
import android.widget.Toast;
public class Main extends Activity {
SearchView sv = null;
ListView lv = null;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
sv = (SearchView) this.findViewById(R.id.sv);
sv.setIconifiedByDefault(false);
sv.setSubmitButtonEnabled(true);
sv.setQueryHint("查询");
//通过反射，修改默认的样式，可以从android的search_view.xml中找到需要的组件
try {
Field field = sv.getClass().getDeclaredField("mSubmitButton");
field.setAccessible(true);
ImageView iv = (ImageView) field.get(sv);
iv.setImageDrawable(this.getResources().getDrawable(
R.drawable.pointer));
} catch (Exception e) {
e.printStackTrace();
}
Cursor cursor = this.getTestCursor();
@SuppressWarnings("deprecation")
SimpleCursorAdapter adapter = new SimpleCursorAdapter(this,
R.layout.mytextview, cursor, new String[] { "tb_name" },
new int[] { R.id.textview });
sv.setSuggestionsAdapter(adapter);
sv.setOnQueryTextListener(new OnQueryTextListener() {
@Override
public boolean onQueryTextChange(String str) {
return false;
}
@Override
public boolean onQueryTextSubmit(String str) {
Toast.makeText(Main.this, str, Toast.LENGTH_SHORT).show();
return false;
}
});
}
//添加suggestion需要的数据
public Cursor getTestCursor() {
SQLiteDatabase db = SQLiteDatabase.openOrCreateDatabase(
this.getFilesDir() + "/my.db3", null);
Cursor cursor = null;
try {
String insertSql = "insert into tb_test values (null,?,?)";
db.execSQL(insertSql, new Object[] { "aa", 1 });
db.execSQL(insertSql, new Object[] { "ab", 2 });
db.execSQL(insertSql, new Object[] { "ac", 3 });
db.execSQL(insertSql, new Object[] { "ad", 4 });
db.execSQL(insertSql, new Object[] { "ae", 5 });
String querySql = "select * from tb_test";
cursor = db.rawQuery(querySql, null);
} catch (Exception e) {
String sql = "create table tb_test (_id integer primary key autoincrement,tb_name varchar(20),tb_age integer)";
db.execSQL(sql);
String insertSql = "insert into tb_test values (null,?,?)";
db.execSQL(insertSql, new Object[] { "aa", 1 });
db.execSQL(insertSql, new Object[] { "ab", 2 });
db.execSQL(insertSql, new Object[] { "ac", 3 });
db.execSQL(insertSql, new Object[] { "ad", 4 });
db.execSQL(insertSql, new Object[] { "ae", 5 });
String querySql = "select * from tb_test";
cursor = db.rawQuery(querySql, null);
}
return cursor;
}
} 实现的效果如下：
