SQLite与AutoCompleteTextView结合使用
发布时间：2020-12-12 20:24:58 所属栏目：百科 来源：网络整理
导读：取SQLite中的数据显示在AutoCompleteTextView中,支持动态加入SQLite中不存在的数据. [java] view plain copy print ? package zhang.ya; import java.io.File; import java.io.FileOutputStream; import java.io.InputStream; import android.app.Activity; i
取SQLite中的数据显示在AutoCompleteTextView中,支持动态加入SQLite中不存在的数据.
[java]
view plain
copy
print
?
package zhang.ya;
import java.io.File;
import java.io.FileOutputStream;
import java.io.InputStream;
import android.app.Activity;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.os.Bundle;
import android.text.Editable;
import android.text.TextWatcher;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.AutoCompleteTextView;
import android.widget.Button;
import android.widget.CursorAdapter;
import android.widget.TextView;
public class Test00 extends Activity implements TextWatcher,OnClickListener
{
private final String DATABASE_PATH = android.os.Environment.getExternalStorageDirectory().getAbsolutePath()
+ "/course_name";
private AutoCompleteTextView courseName;
private final String DATABASE_FILENAME = "course_name.db3";
private SQLiteDatabase database;
private Button btnSelectWord;
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
database = openDatabase();
courseName = (AutoCompleteTextView) findViewById(R.id.courseName);
courseName.setThreshold(1);
courseName.addTextChangedListener(this);
btnSelectWord = (Button) findViewById(R.id.buttonName);
btnSelectWord.setOnClickListener(this);
}
public class CourseNameAdapter extends CursorAdapter
{
private LayoutInflater layoutInflater;
@Override
public CharSequence convertToString(Cursor cursor)
{
return cursor == null ? "" : cursor.getString(cursor.getColumnIndex("course_name"));
}
private void setView(View view,Cursor cursor)
{
TextView tvWordItem = (TextView) view;
tvWordItem.setText(cursor.getString(cursor.getColumnIndex("course_name")));
}
@Override
public void bindView(View view,Context context,Cursor cursor)
{
setView(view,cursor);
}
@Override
public View newView(Context context,Cursor cursor,ViewGroup parent)
{
View view = layoutInflater.inflate(R.layout.word_list_item,null);
setView(view,cursor);
return view;
}
public CourseNameAdapter(Context context,Cursor c,boolean autoRequery)
{
super(context,autoRequery);
layoutInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
}
//输入为空则使得确定按钮失效,只有输入了数据才使得按钮处于活动状态
@Override
public void afterTextChanged(Editable s)
{
Log.i("zhangya","textchage");
String contentStr = s.toString();
if (contentStr == null || contentStr.length() <= 0)//判断contentStr是否为空,判断字符串是否为空典型写法
{
Log.i("zhangya","afterTextChanged null");
btnSelectWord.setEnabled(false);//为空则不是能按钮
} else
{
Log.i("zhangya","afterTextChanged not null");
btnSelectWord.setEnabled(true);
Cursor cursor = database.rawQuery("select * from course_name where course_name like ?",new String[]
{ contentStr + "%" });
CourseNameAdapter dictionaryAdapter = new CourseNameAdapter(this,true);
courseName.setAdapter(dictionaryAdapter);
}
}
@Override
public void beforeTextChanged(CharSequence s,int start,int count,int after)
{
// TODO Auto-generated method stub
}
@Override
public void onTextChanged(CharSequence s,int before,int count)
{
}
private SQLiteDatabase openDatabase()
{
try
{
String databaseFilename = DATABASE_PATH + "/" + DATABASE_FILENAME;
File dir = new File(DATABASE_PATH);
if (!dir.exists())
dir.mkdir();
if (!(new File(databaseFilename)).exists())
{
InputStream is = getResources().openRawResource(R.raw.course_name);
FileOutputStream fos = new FileOutputStream(databaseFilename);
byte[] buffer = new byte[8192];
int count = 0;
while ((count = is.read(buffer)) > 0)
{
fos.write(buffer,count);
}
fos.close();
is.close();
}
SQLiteDatabase database = SQLiteDatabase.openOrCreateDatabase(databaseFilename,null);
return database;
} catch (Exception e)
{
}
return null;
}
@Override
public void onClick(View v)
{
String sql = "select * from course_name where course_name=?";
Cursor cursor = database.rawQuery(sql,new String[]
{ courseName.getText().toString() });
if (cursor.getCount() == 0)//没有同名记录,则插入数据
{
sql = "insert into course_name(course_name)values(?)";
database.execSQL(sql,new Object[]
{ courseName.getText().toString() });
} else
{
Log.i("zhangya","else");
}
cursor.moveToFirst();
}
}
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