1200字范文 > 调用有道词典查词

调用有道词典查词

时间：2020-11-20 08:34:00

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调用有道词典查词

一具体实现过程

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;@Overrideprotected 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);}@Overridepublic 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

三 DBHelper 类

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;}}

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