小程序源码 学习相关 英文电子词典源码.rar

package net.blogjava.mobile; import java.io.File; import java.io.FileOutputStream; import java.io.InputStream; import android.app.Activity; import android.app.AlertDialog; 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.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.view.View.OnClickListener; import android.widget.AutoCompleteTextView; import android.widget.Button; import android.widget.CursorAdapter; import android.widget.TextView; public class Main extends Activity implements OnClickListener, TextWatcher { private final String DATABASE_PATH = android.os.Environment .getExternalStorageDirectory().getAbsolutePath() + "/dictionary"; private AutoCompleteTextView actvWord; private final String DATABASE_FILENAME = "dictionary.db"; private SQLiteDatabase database; private Button btnSelectWord; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); database = openDatabase(); btnSelectWord = (Button) findViewById(R.id.btnSelectWord); actvWord = (AutoCompleteTextView) findViewById(R.id.actvWord); btnSelectWord.setOnClickListener(this); actvWord.addTextChangedListener(this); } public class DictionaryAdapter extends CursorAdapter { private LayoutInflater layoutInflater; @Override public CharSequence convertToString(Cursor cursor) { return cursor == null ? "" : cursor.getString(cursor .getColumnIndex("_id")); } private void setView(View view, Cursor cursor) { TextView tvWordItem = (TextView) view; tvWordItem.setText(cursor.getString(cursor.getColumnIndex("_id"))); } @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 DictionaryAdapter(Context context, Cursor c, boolean autoRequery) { super(context, c, autoRequery); layoutInflater = (LayoutInflater) context .getSystemService(Context.LAYOUT_INFLATER_SERVICE); } } public void afterTextChanged(Editable s) { // 必须将english字段的别名设为_id Cursor cursor = database.rawQuery( "select english as _id from t_words where english like ?", new String[] { s.toString() + "%" }); DictionaryAdapter dictionaryAdapter = new DictionaryAdapter(this, cursor, true); actvWord.setAdapter(dictionaryAdapter); } public void beforeTextChanged(CharSequence s, int start, int count, int after) { // TODO Auto-generated method stub } public void onTextChanged(CharSequence s, int start, int before, int count) { // TODO Auto-generated method stub } public void onClick(View view) { String sql = "select chinese from t_words where english=?"; Cursor cursor = database.rawQuery(sql, new String[] { actvWord.getText().toString() }); String result = "未找到该单词."; // 如果查找单词，显示其中文的意思 if (cursor.getCount() > 0) { // 必须使用moveToFirst方法将记录指针移动到第1条记录的位置 cursor.moveToFirst(); result = cursor.getString(cursor.getColumnIndex("chinese")); } // 显示查询结果对话框 new AlertDialog.Builder(this).setTitle("查询结果").setMessage(result) .setPositiveButton("关闭", null).show(); } private SQLiteDatabase openDatabase() { try { // 获得dictionary.db文件的绝对路径 String databaseFilename = DATABASE_PATH + "/" + DATABASE_FILENAME; File dir = new File(DATABASE_PATH); // 如果/sdcard/dictionary目录中存在，创建这个目录 if (!dir.exists()) dir.mkdir(); // 如果在/sdcard/dictionary目录中不存在 // dictionary.db文件，则从res\raw目录中复制这个文件到 // SD卡的目录（/sdcard/dictionary） if (!(new File(databaseFilename)).exists()) { // 获得封装dictionary.db文件的InputStream对象 InputStream is = getResources().openRawResource( R.raw.dictionary); FileOutputStream fos = new FileOutputStream(databaseFilename); byte[] buffer = new byte[8192]; int count = 0; // 开始复制dictionary.db文件 while ((count = is.read(buffer)) > 0) { fos.write(buffer, 0, count); } fos.close(); is.close(); } // 打开/sdcard/dictionary目录中的dictionary.db文件 SQLiteDatabase database = SQLiteDatabase.openOrCreateDatabase( databaseFilename, null); return database; } catch (Exception e) { } return null; } }