代碼片段(1)[全屏查看所有代碼]
1. [代碼]Java代碼 跳至 [1] [全屏預覽]
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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";//數據庫的名字 private
static
String DATABASE_PATH="/data/data/com.android.qufu.dinner/databases/";//數據庫在手機裏的路徑 int
alpha = 255;
int
b = 0;
public
void
onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState);
setContentView(R.layout.login);
//判斷數據庫是否存在 boolean
dbExist = checkDataBase(); if(dbExist){ }else{//不存在就把raw裏的數據庫寫入手機 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){ } } }
}
/** *
判斷數據庫是否存在 *
@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; } /** *
複製數據庫到手機指定文件夾下 *
@throws IOException */ public
void
copyDataBase() throws
IOException{ String
databaseFilenames =DATABASE_PATH+dbName; File
dir = new
File(DATABASE_PATH); if(!dir.exists())//判斷文件夾是否存在，不存在就新建一個 dir.mkdir(); FileOutputStream
os = null; try{ os
= new
FileOutputStream(databaseFilenames);//得到數據庫文件的寫入流 }catch(FileNotFoundException
e){ e.printStackTrace(); } InputStream
is = Loggin.this.getResources().openRawResource(R.raw.test);//得到數據庫文件的數據流 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，這裏是起始頁的沒有用 */ public
void
initApp(){ }
}
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