在把数据库文件放在raw中，在应用程序中如何打开

1、DbManager代码

 package com.zyh.zyhimportdatabase;

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

 import android.content.Context;
 import android.database.sqlite.SQLiteDatabase;
 import android.os.Environment;

 public class DbManager {
     private static final int BUFFER_SIZE = 1024;
     private static final String DB_NAME = "person2.db";
     private static final String PACKAGE_NAME = "com.zyh.zyhimportdatabase";
     private static final String DB_PATH = "/data" +
     Environment.getDataDirectory().getAbsolutePath() + "/" + PACKAGE_NAME;

     private SQLiteDatabase database;
     private Context context;

     public DbManager(Context context){
         this.context = context;
     }

     public void openDatabase(){
         this.database = this.openDatabase(DB_PATH + "/" + DB_NAME);
     }

     private SQLiteDatabase openDatabase(String dbFile) {
         try {
             File db_file = new File(dbFile);
             if(!db_file.exists()){
                 InputStream is = this.context.getResources().openRawResource(R.raw.person2);
                 FileOutputStream fos = new FileOutputStream(dbFile);
                 byte[] buffer = new byte[BUFFER_SIZE];
                 int len = 0;
                 while((len = is.read(buffer)) > 0){
                     fos.write(buffer, 0, len);
                 }
                 fos.close();
                 is.close();
             }

             SQLiteDatabase db = SQLiteDatabase.openOrCreateDatabase(db_file, null);
             return db;
         } catch (Exception e) {
             // TODO Auto-generated catch block
             e.printStackTrace();
         }
         return null;
     }

     public SQLiteDatabase getDb(){
         return this.database;
     }

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

2、activity代码

 package com.zyh.zyhimportdatabase;

 import android.os.Bundle;
 import android.os.Environment;
 import android.util.Log;
 import android.app.Activity;
 import android.database.sqlite.SQLiteDatabase;

 public class MainActivity extends Activity {

     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);

         //Log.i("zyh", Environment.getDataDirectory().getAbsolutePath());
         DbManager dbHelper = new DbManager(getApplicationContext());
         dbHelper.openDatabase();
         SQLiteDatabase db = dbHelper.getDb();
         System.out.println(db.isReadOnly());
         dbHelper.closeDatabase();

     }

 }

上述代码的参考:http://www.cnblogs.com/xiaowenji/archive/2011/01/03/1925014.html

注意:A、关于对getReadableDatabase()的误区:可以参考http://blog.csdn.net/liuhe688/article/details/6715983/和http://blog.chinaunix.net/uid-22816738-id-3802353.html

B、关于多线程对db的使用，正确的方法可以参考:http://blog.csdn.net/sky_monkey/article/details/23820021