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android中的autocomplete事例小结

网友分享于:2013-08-22  浏览:38次
android中的autocomplete例子小结
  小结下android中的autocomplete和sqlite的知识点,顺便复习下。
1 SQLITE帮助类
   public class SQLiteCountryAssistant extends SQLiteOpenHelper {
private static final String DB_NAME = "usingsqlite.db";
private static final int DB_VERSION_NUMBER = 1;
private static final String DB_TABLE_NAME = "countries";
private static final String DB_COLUMN_1_NAME = "country_name";
private static final String DB_CREATE_SCRIPT = "create table "
+ DB_TABLE_NAME
+ " (_id integer primary key autoincrement, country_name text not null);)";
private SQLiteDatabase sqliteDBInstance = null;

public SQLiteCountryAssistant(Context context) {
super(context, DB_NAME, null, DB_VERSION_NUMBER);
}

@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
// TODO: Implement onUpgrade
}

@Override
public void onCreate(SQLiteDatabase sqliteDBInstance) {
Log.i("onCreate", "Creating the database...");
sqliteDBInstance.execSQL(DB_CREATE_SCRIPT);
}

public void openDB() throws SQLException {
Log.i("openDB", "Checking sqliteDBInstance...");
if (this.sqliteDBInstance == null) {
Log.i("openDB", "Creating sqliteDBInstance...");
this.sqliteDBInstance = this.getWritableDatabase();
}
}

public void closeDB() {
if (this.sqliteDBInstance != null) {
if (this.sqliteDBInstance.isOpen())
this.sqliteDBInstance.close();
}
}

public long insertCountry(String countryName) {
ContentValues contentValues = new ContentValues();
contentValues.put(DB_COLUMN_1_NAME, countryName);
Log
.i(this.toString() + " - insertCountry", "Inserting: "
+ countryName);
return this.sqliteDBInstance.insert(DB_TABLE_NAME, null, contentValues);
}

public boolean removeCountry(String countryName) {
int result = this.sqliteDBInstance.delete(DB_TABLE_NAME,
"country_name='" + countryName + "'", null);
if (result > 0)
return true;
else
return false;
}

public long updateCountry(String oldCountryName, String newCountryName) {
ContentValues contentValues = new ContentValues();
contentValues.put(DB_COLUMN_1_NAME, newCountryName);
return this.sqliteDBInstance.update(DB_TABLE_NAME, contentValues,
"country_name='" + oldCountryName + "'", null);

}

public String[] getAllCountries() {
Cursor cursor = this.sqliteDBInstance
.query(DB_TABLE_NAME, new String[] { DB_COLUMN_1_NAME }, null,
null, null, null, null);
if (cursor.getCount() > 0) {
String[] str = new String[cursor.getCount()];
int i = 0;
while (cursor.moveToNext()) {
str[i] = cursor.getString(cursor
.getColumnIndex(DB_COLUMN_1_NAME));
i++;
}
return str;
} else {
return new String[] {};
}
}

2 使用的autocomplete类
   public class UsingSQLite extends Activity
{
private SQLiteCountryAssistant sqlliteCountryAssistant;
@Override  
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
final AutoCompleteTextView textView = (AutoCompleteTextView) findViewById(R.id.autocompleteCountry); 
sqlliteCountryAssistant = new SQLiteCountryAssistant(UsingSQLite.this);    
sqlliteCountryAssistant.openDB();    
// Insert a few countries that begin with "C"      
sqlliteCountryAssistant.insertCountry("Cambodia"); 
sqlliteCountryAssistant.insertCountry("Cameroon");  
sqlliteCountryAssistant.insertCountry("Canada");    
sqlliteCountryAssistant.insertCountry("Cape Verde");
sqlliteCountryAssistant.insertCountry("Cayman Islands");
sqlliteCountryAssistant.insertCountry("Chad");   
sqlliteCountryAssistant.insertCountry("Chile");   
sqlliteCountryAssistant.insertCountry("China");  
//sqlliteCountryAssistant.removeCountry("Chad");      
//sqlliteCountryAssistant.updateCountry("Canada", "Costa Rica"); 
String[] countries = sqlliteCountryAssistant.getAllCountries();  
// Print out the values to the log   
for(int i = 0; i < countries.length; i++) 
{           
Log.i(this.toString(), countries[i]);    
}        
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, R.layout.list_item, countries);    
textView.setAdapter(adapter); 
}   
public void onDestroy() 
{     
super.onDestroy();    
sqlliteCountryAssistant.close();  
}
}

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