Android 关于 如何使用外界导入的数据库文件

package com.jamin;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;

import android.content.Context;
import android.content.res.Resources.NotFoundException;
import android.database.sqlite.SQLiteDatabase;
import android.os.Environment;

public class DBManager {

	private final int BUFFER_SIZE = 400000;
	public static final String DB_NAME = "callattribution.db";
	public static final String PACKAGE_NAME = "com.jamin";
	public static final String DB_PATH = "/data"
	                    + Environment.getDataDirectory().getAbsolutePath() + "/"
	                    + PACKAGE_NAME;
	private SQLiteDatabase database;
	private Context context;
	
	DBManager(Context context){
		this.context = context;
		
	}
	public void openDatabase(){
		this.database = this.openDatabase(DB_PATH + "/" + DB_NAME);
	}
	
	public SQLiteDatabase openDatabase(String path){

		try {
			if(!(new File(path).exists())){
				InputStream is = this.context.getResources().openRawResource(R.raw.callattribution);//导入数据库
				FileOutputStream fos = new FileOutputStream(path);
				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(path, null);
			return db;
			
		} catch (NotFoundException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (FileNotFoundException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}


		return null;
	}
	public void closeDatabase(){
		this.database.close();
	}

}

package com.jamin;

import android.app.Activity;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;

public class CallAtributionActivity extends Activity implements OnClickListener{
    /** Called when the activity is first created. */
	
	Button button;
	EditText et;
	TextView tv;
	public DBManager dbhelper;
	SQLiteDatabase sqldb;
	private static final String TAG = "jamin";
	
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        button = (Button) findViewById(R.id.button);
        et = (EditText) findViewById(R.id.edittext);
        tv = (TextView) findViewById(R.id.textview);
        dbhelper = new DBManager(this);
        dbhelper.openDatabase();
        dbhelper.closeDatabase();
        button.setOnClickListener(this);
        sqldb = SQLiteDatabase.openOrCreateDatabase(DBManager.DB_PATH + "/" + DBManager.DB_NAME, null);
        
    }

	public void onClick(View v) {
		// TODO Auto-generated method stub
		if(v == button){
			Log.d(TAG, "onClick");
			String searchstring = et.getText().toString();
			
			Cursor c = sqldb.rawQuery("select city from attribution where " +"num=" +Integer.parseInt(searchstring) , null);
			
			c.moveToFirst();
			tv.setText(c.getString(c.getColumnIndex("city")));
		}
	}
    
}

这个代码还存在很多BUG，只是演示如何使用导入的数据库，把DB文件放到res/raw下，然后通过DBManager 把数据库导入data/data/里