import java.io.File;import java.io.FileNotFoundException;import java.io.FileOutputStream;import java.io.IOException;import java.io.InputStream; import com.android.qufu.dinner.MealActivityGroup;import com.android.qufu.dinner.R; import android.app.Activity;import android.content.Context;import android.content.Intent;import android.content.SharedPreferences;import android.content.pm.ActivityInfo;import android.database.sqlite.SQLiteDatabase;import android.database.sqlite.SQLiteException;import android.os.Bundle;import android.os.Handler;import android.os.Message;import android.view.Window;import android.view.WindowManager;import android.widget.ImageView;import android.widget.TextView; public class Loggin extends Activity {    public static String dbName="dinner.db";//数据库的名字    private static String DATABASE_PATH="/data/data/com.android.qufu.dinner/databases/";//数据库在手机里的路径     int alpha = 255;      int b = 0;           public void onCreate(Bundle savedInstanceState) {             super.onCreate(savedInstanceState);             setContentView(R.layout.login);             //判断数据库是否存在            boolean dbExist = checkDataBase();            if(dbExist){                             }else{//不存在就把raw里的数据库写入手机                try{                    copyDataBase();                }catch(IOException e){                    throw new Error("Error copying database");                }            }                         new Thread(new Runnable() {                 public void run() {                     initApp(); //初始化程序                                           while (b < 2) {                         try {                             if (b == 0) {                                 Thread.sleep(20);                                 b = 1;                             } else {                                 Thread.sleep(50);                             }                             updateApp();                         } catch (InterruptedException e) {                             e.printStackTrace();                         }                     }                 }             }).start();                      }          public void updateApp() {             alpha -= 5;             if (alpha <= 0) {                 b = 2;                 if(true){                try{                   Intent in = new Intent(Loggin.this,MealActivityGroup.class);                    Loggin.this.startActivity(in);                    Loggin.this.finish();                }catch(Exception e){                                             }                }                            }                     }         /**         * 判断数据库是否存在         * @return false or true         */        public boolean checkDataBase(){            SQLiteDatabase checkDB = null;            try{                String databaseFilename = DATABASE_PATH+dbName;                checkDB =SQLiteDatabase.openDatabase(databaseFilename, null,                        SQLiteDatabase.OPEN_READONLY);            }catch(SQLiteException e){                             }            if(checkDB!=null){                checkDB.close();            }            return checkDB !=null?true:false;        }        /**         * 复制数据库到手机指定文件夹下         * @throws IOException         */        public void copyDataBase() throws IOException{            String databaseFilenames =DATABASE_PATH+dbName;            File dir = new File(DATABASE_PATH);            if(!dir.exists())//判断文件夹是否存在，不存在就新建一个                dir.mkdir();            FileOutputStream os = null;            try{                os = new FileOutputStream(databaseFilenames);//得到数据库文件的写入流            }catch(FileNotFoundException e){                e.printStackTrace();            }            InputStream is = Loggin.this.getResources().openRawResource(R.raw.test);//得到数据库文件的数据流            byte[] buffer = new byte[8192];            int count = 0;            try{                                 while((count=is.read(buffer))>0){                    os.write(buffer, 0, count);                    os.flush();                }            }catch(IOException e){                             }            try{                is.close();                os.close();            }catch(IOException e){                e.printStackTrace();            }        }        /**         * 初始化，这里是起始页的没有用         */        public void initApp(){                  }     }