1
我想在搜索参数无效时使用吐司消息。说,我想显示敬酒消息“无效搜索”关于使用吐司消息的说明
这里是我的示例代码,
**Database.java**
package samples.employeephone;
import android.content.ContentValues;
import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
public class Database extends SQLiteOpenHelper {
public static final String DATABASE_NAME = "employee_directory";
public Database(Context context) {
super(context, DATABASE_NAME, null, 1);
}
@Override
public void onCreate(SQLiteDatabase db) {
String sql = "CREATE TABLE IF NOT EXISTS employee (" +
"_id INTEGER PRIMARY KEY AUTOINCREMENT, " +
"firstName TEXT, " +
"lastName TEXT, " +
"title TEXT, " +
"officePhone TEXT, " +
"cellPhone TEXT, " +
"email TEXT, " +
"managerId INTEGER)";
db.execSQL(sql);
ContentValues values = new ContentValues();
values.put("firstName", "xyz");
values.put("lastName", "abc");
values.put("title", "PL");
values.put("officePhone", "123456");
values.put("cellPhone", "123456");
values.put("email", "[email protected]");
db.insert("employee", "lastName", values);
values.put("firstName", "eeee");
values.put("lastName", "aaaa");
values.put("title", "PM");
values.put("officePhone", "234576");
values.put("cellPhone", "2344556");
values.put("email", "[email protected]");
values.put("managerId", "1");
db.insert("employee", "lastName", values);
values.put("firstName", "ash");
values.put("lastName", "l");
values.put("title", "POC");
values.put("officePhone", "454454");
values.put("cellPhone", "5454646");
values.put("email", "[email protected]");
values.put("managerId", "1");
db.insert("employee", "lastName", values);
values.put("firstName", "ddd");
values.put("lastName", "yxv");
values.put("title", "AS");
values.put("officePhone", "654545");
values.put("cellPhone", "5454545");
values.put("email", "[email protected]");
values.put("managerId", "2");
db.insert("employee", "lastName", values);
values.put("firstName", "din");
values.put("lastName", "sss");
values.put("title", "ers");
values.put("officePhone", "25545");
values.put("cellPhone", "65454");
values.put("email", "[email protected]");
values.put("managerId", "2");
db.insert("employee", "lastName", values);
values.put("firstName", "sis");
values.put("lastName", "and");
values.put("title", "VP");
values.put("officePhone", "878788");
values.put("cellPhone", "88787");
values.put("email", "[email protected]");
values.put("managerId", "2");
db.insert("employee", "lastName", values);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
db.execSQL("DROP TABLE IF EXISTS employees");
onCreate(db);
}
}
**PhonebookActivity.java**
package samples.employeephone;
//import samples.employeedirectory.R;
import android.app.Activity;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.os.Bundle;
import android.view.View;
import android.widget.EditText;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.SimpleCursorAdapter;
public class PhonebookActivity extends Activity {
protected EditText searchText;
protected SQLiteDatabase db;
protected Cursor cursor;
protected ListAdapter adapter;
protected ListView employeeList;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
db = (new Database(this)).getWritableDatabase();
searchText = (EditText) findViewById (R.id.searchText);
employeeList = (ListView) findViewById (R.id.list);
}
public void search(View view) {
// || is the concatenation operation in SQLite
cursor = db.rawQuery("SELECT _id, firstName, lastName, title FROM employee WHERE firstName || ' ' || lastName LIKE ?",
new String[]{"%" + searchText.getText().toString() + "%"});
adapter = new SimpleCursorAdapter(
this,
R.layout.employee_list_item,
cursor,
new String[] {"firstName", "lastName", "title"},
new int[] {R.id.firstName, R.id.lastName, R.id.title});
employeeList.setAdapter(adapter);
}
}
and my xml files are,
**main.xml**
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<LinearLayout
android:orientation="horizontal"
android:layout_width="fill_parent"
android:layout_height="wrap_content">
<EditText
android:id="@+id/searchText"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_weight="1"/>
<Button
android:id="@+id/searchButton"
android:text="Search"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:onClick="search"/>
</LinearLayout>
<ListView
android:id="@+id/list"
android:layout_width="fill_parent"
android:layout_height="fill_parent"/>
</LinearLayout>
**employee_list_item.xml**
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="horizontal"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:padding="8px">
<TextView
android:id="@+id/firstName"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>
<TextView
android:id="@+id/lastName"
android:layout_marginLeft="6px"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_toRightOf="@id/firstName"/>
<TextView
android:id="@+id/title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@id/firstName"/>
</RelativeLayout>
现在,我的搜索,如果输入的名称为无效时,我想表明它在吐司消息,所以如何使用它在这里,
希望你的善举,因为我是这个平台的新手。
那么,在您的代码中找不到与您的问题相关的任何内容。 Toast应该创建在哪里? – Egor 2012-02-15 10:29:11
嗨,在 values.put(“firstName”,“xyz”);如果我输入这个说你好这是不可用然后通过一个吐司味精显示一个错误....如果(firstName ==“xyz”)它显示有效的信息其他应该显示一个吐司味“无效搜索” – mahi 2012-02-15 10:32:43
好的,那么当然你应该使用if-else子句。 – Egor 2012-02-15 10:36:16