SQLite与AutoCompleteTextView结合使用

概述读取SQLite中的数据显示在AutoCompleteTextView中,支持动态加入SQLite中不存在的数据.  package zhang.ya;import java.io.File;import java.io.FileOutputStream;import java.io.InputStream;import android.app.Activity;imp

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.

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,c,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,cursor,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(); }}

1.未输入时状态:

2.输入后:

总结

以上是内存溢出为你收集整理的SQLite与AutoCompleteTextView结合使用全部内容，希望文章能够帮你解决SQLite与AutoCompleteTextView结合使用所遇到的程序开发问题。

如果觉得内存溢出网站内容还不错，欢迎将内存溢出网站推荐给程序员好友。