词典查询
2015-07-03 10:31
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在MainActivity.java下:
package com.example.happydictionary; import android.app.Activity; import android.os.Bundle; import android.text.TextUtils; import android.view.Menu; import android.view.View; import android.widget.EditText; import android.widget.TextView; import com.example.happydictionary.dao.WordDao; public class MainActivity extends Activity { private WordDao wordDao; private EditText etWord; private TextView tvResult; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); initViews(); } private void initViews() { etWord = (EditText) findViewById(R.id.etWord); tvResult = (TextView) findViewById(R.id.tvSearchResult); } @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.main, menu); return true; } public void searchWord(View view) { String english = etWord.getText().toString(); wordDao = new WordDao(this); if (TextUtils.isEmpty(english)) { tvResult.setText("请输入您想查询的单词"); } else { String chinese = wordDao.getChinese(english); tvResult.setText(chinese); } } }
在WordDao.java下:
package com.example.happydictionary.dao; import android.content.Context; import android.database.Cursor; import android.database.sqlite.SQLiteDatabase; import com.example.happydictionary.db.DBHelper; public class WordDao { private DBHelper dbHelper; private SQLiteDatabase sqLiteDatabase; public WordDao(Context context){ dbHelper=new DBHelper(context); } public String getChinese(String english){ sqLiteDatabase=dbHelper.openDatabase(); String sql="select chinese from t_words where english=?"; Cursor cursor=sqLiteDatabase.rawQuery(sql, new String[]{english}); String chinese="查无该词"; if(cursor.moveToFirst()){ chinese=cursor.getString(cursor.getColumnIndex("chinese")); } return chinese; } }
在DBHelper.java下:
package com.example.happydictionary.db; import java.io.File; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStream; import com.example.happydictionary.R; import com.example.happydictionary.R.raw; import android.content.Context; import android.database.sqlite.SQLiteDatabase; import android.os.Environment; import android.util.Log; /** * 实现将数据库文件从raw目录拷贝到手机里存放数据库的位置 * * @author cabbage */ public class DBHelper { private final int BUFFER_SIZE = 400000; public static final String DB_NAME = "idiom.db"; // 保存的数据库文件名 public static final String PACKAGE_NAME = "com.example.happydictionary";// 应用的包名 public static final String DB_PATH = "/data" + Environment.getDataDirectory().getAbsolutePath() + "/" + PACKAGE_NAME + "/databases"; /*// SDCard 定义数据库的存放路径 private final String DATABASE_PATH = android.os.Environment .getExternalStorageDirectory().getAbsolutePath() + "/dictionary";*/ private Context context; public DBHelper(Context context) { this.context = context; } public SQLiteDatabase openDatabase() { try { File myDataPath = new File(DB_PATH); if (!myDataPath.exists()) { myDataPath.mkdirs();// 如果没有这个目录则创建 } String dbfile = myDataPath + "/" + DB_NAME; if (!(new File(dbfile).exists())) {// 判断数据库文件是否存在,若不存在则执行导入,否则直接打开数据库 InputStream is = context.getResources().openRawResource( R.raw.dictionary); // 欲导入的数据库 FileOutputStream fos = new FileOutputStream(dbfile); byte[] buffer = new byte[BUFFER_SIZE]; int count = 0; while ((count = is.read(buffer)) > 0) { fos.write(buffer, 0, count); } fos.close(); is.close(); } SQLiteDatabase db = SQLiteDatabase.openOrCreateDatabase(dbfile, null); return db; } catch (FileNotFoundException e) { Log.e("Database", "File not found"); e.printStackTrace(); } catch (IOException e) { Log.e("Database", "IO exception"); e.printStackTrace(); } return null; } }
在Word.java下:
package com.example.happydictionary.entity; public class Word { private String english; private String chinese; public String getEnglish() { return english; } public void setEnglish(String english) { this.english = english; } public String getChinese() { return chinese; } public void setChinese(String chinese) { this.chinese = chinese; } }
在DBHelperTest.java下:
package com.example.happydictionary.test; import com.example.happydictionary.db.DBHelper; import android.test.AndroidTestCase; public class DBHelperTest extends AndroidTestCase { public void testCreateDB(){ DBHelper dbHelper=new DBHelper(getContext()); dbHelper.openDatabase(); } }
在activity_main.xml下:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:background="@drawable/mainbg" android:paddingBottom="@dimen/activity_vertical_margin" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" tools:context=".MainActivity" > <EditText android:id="@+id/etWord" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentLeft="true" android:layout_alignParentTop="true" android:layout_marginTop="31dp" android:background="@android:drawable/edit_text" android:ems="10" android:hint="@string/searchHint" android:singleLine="true" android:textColor="#552006" android:textColorHint="#782f10" > <requestFocus /> </EditText> <Button android:id="@+id/btnSearch" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignBaseline="@+id/etWord" android:layout_alignBottom="@+id/etWord" android:layout_marginLeft="16dp" android:layout_toRightOf="@+id/etWord" android:background="@drawable/ibsearchword" android:onClick="searchWord" android:text="@string/serachWord" /> <TextView android:id="@+id/tvSearchResult" android:layout_width="match_parent" android:layout_height="match_parent" android:layout_alignLeft="@+id/etWord" android:layout_below="@+id/etWord" android:layout_marginTop="22dp" android:textSize="25sp" android:background="@drawable/bg_roundcorner" android:textAppearance="?android:attr/textAppearanceMedium" /> </RelativeLayout>
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