- 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);
- }
- }
- }
二 activity_main.xml
[java] view plaincopy
- <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>
[java] view plaincopy
- 三 DBHelper 类
[java] view plaincopy
- 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;
- }
- }
时间: 2024-10-23 06:07:59