① 什麼是Activity，詳細介紹Activity
Activity是Android系統中的四大組件之一，可以用於顯示View。Activity是一個與用記交互的系統模塊，幾乎所有的Activity都是和用戶進行交互的，但是如果這樣就能說Activity主要是用來顯示View就不太正確了。
Activity有四種狀態：
活動狀態，當Activity處於Stack（棧）頂時，就是手機當前的現實屏幕，這是 Activity就
處於activity或者運行狀態。
運行但是失去焦點，當Activity還處於運行狀態時，但是屏幕是有另外一個Activity
處於文檔處於焦點狀態，當前的Activity就處於pause。
停止，當Activity被另一個Activity完全覆蓋的時候，就被停止了，其實就是雖然在
運行，但是用戶卻看不見。
結束，當Activity處於pause或者stop時，系統可以結束 Activity，回收資源，這
是Activity就是處於結束狀態了。
處於結束狀態的是Activity，如果要使用戶可見，只要重啟才可以。
Activity的響應時間
當前Activity所在的線程為主線程，它的響應時間為5秒，如果在當前運行的Activity中進行耗時的操作且響應時間起過5秒，那麼程序就會報ANR錯誤。所以，這也是不建議在Activity中寫太多復雜代碼的原因之一。
當然，有些代碼只能寫在Activity中，不然就運行不了（它們不是生命周期方法），比如你想要獲得android系統或者硬體一的些信息，就必須在Activity中寫出來，如果單獨寫一個工具類獲得不了。
② 在android開發中,怎麼才能使不同的Activity使用的是同一個sqlite資料庫(同一個資料庫對象)
直接寫一個資料庫操作類，無論你在哪個Activity裡面，直接用資料庫操作類名調用裡面的靜態方法不就行了
③ android中如何在不同的activity上操作同一個資料庫
完全可以啊，你獲得資料庫對象，好像是Sqldatebase 的對象。直接操作資料庫添加，刪除，修改。跟Ativity沒啥關系吧。就好比MFC中不通界面都可以對資料庫進行操作。只要資料庫對象傳遞過去就行。
④ 活動資料庫
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⑤ 什麼是Activity，詳細介紹Activity
Activity
首先，Activity是Android系統中的四大組件之一，可以用於顯示View。Activity是一個與用記交互的系統模塊，幾乎所有的Activity都是和用戶進行交互的，但是如果這樣就能說Activity主要是用來顯示View就不太正確了。
在深入了解Activity之前，我們先要知道一下MVC設計模式，在JAVAEE 中MVC設計模式已經很經典了，而且分的也比較清晰了，但是在Android中，好多人對MVC在Android開發中的應用不是很清楚，下面我就先來介紹一下MVC在Android開發中的應用：
M(Model 模型)：Model是應用程序的主體部分，所有的業務邏輯都應該寫在這里，在Android中Model層與JavaEE中的變化不大，如：對資料庫的操作，對網路等的操作都放在該層（但不是說它們都放在同一個包中，可以分開放，但它們統稱為Model層）。
V（View 視圖）：是應用程序中負責生成用戶界面的部分，也是在整個MVC架構中用戶唯一可以看到的一層，接收用戶輸入，顯示處理結果；在Android應用中一般採用XML文件里德界面的描述，使用的時候可以非常方便的引入，當然也可以使用JavaScript+Html等方式作為View。
C（Controller控制層）android的控制層的重任就要落在眾多的activity的肩上了，所以在這里就要建議大家不要在activity中寫太多的代碼，盡量能過activity交割Model業務邏輯層處理。
好了，在介紹過Android應用開發中的MVC架構後，我們就可以很明確的知道，在Android中Activity主要是用來做控制的，它可以選擇要顯示的View，也可以從View中獲取數據然後把數據傳給Model層進行處理，最後再來顯示出處理結果。
介紹過Activity的主要作用後，那麼我們就要詳細說一下Activity了。
Activity生命周期圖
Activity 的生命周期是被以下的函數控制的。
public class Activity extends ApplicationContext {
protected void onCreate(Bundle icicle);
protected void onStart();
protected void onRestart();
protected void onResume();
protected void onFreeze(Bundle outIcicle);
protected void onPause();
protected void onStop();
protected void onDestroy();
}
onCreate(Bundle) 函數是你進行初始化的地方，這個也是執行
setContentView(View)函數的地方，setContentView(View)函數可以傳入一個由XML
編制的UI界面，可以使UI和具體實現完全分離。
onPause()函數是處理用戶離開當前 Activity 的地方。更重要的是，任何在當前
Activity中的任何改變都要在這個函數中提交。
Activity有四種狀態：
活動狀態，當Activity處於Stack（棧）頂時，就是手機當前的現實屏幕，這是 Activity就
處於activity或者運行狀態。
運行但是失去焦點，當Activity還處於運行狀態時，但是屏幕是有另外一個Activity
處於文檔處於焦點狀態，當前的Activity就處於pause。
停止，當Activity被另一個Activity完全覆蓋的時候，就被停止了，其實就是雖然在
運行，但是用戶卻看不見。
結束，當Activity處於pause或者stop時，系統可以結束 Activity，回收資源，這
是Activity就是處於結束狀態了。
處於結束狀態的是Activity，如果要使用戶可見，只要重啟才可以。
Activity的響應時間
當前Activity所在的線程為主線程，它的響應時間為5秒，如果在當前運行的Activity中進行耗時的操作且響應時間起過5秒，那麼程序就會報ANR錯誤。所以，這也是不建議在Activity中寫太多復雜代碼的原因之一。
當然，有些代碼只能寫在Activity中，不然就運行不了（它們不是生命周期方法），比如你想要獲得android系統或者硬體一的些信息，就必須在Activity中寫出來，如果單獨寫一個工具類獲得不了。
⑥ 我的程序中每個activity都打開了資料庫，什麼時候關，怎麼關 [
建議你把cursor.close()和db.close()和打開資料庫都封裝在方法增刪改查的方法里，使用完就關閉這樣對數據的操作也更安全。
⑦ 怎麼 在activity中使用資料庫
參考一下android.database.sqlite.SQLiteOpenHelper的用法
可以繼承這個類寫一個Helper，重寫一下它的onCreate和onUpdate之類的方法
然後在activity中合適的位置生成這個類對象，用這個Helper對象來獲取資料庫、獲取查詢結果或者執行SQL！
⑧ Android 中Activity之間怎麼傳遞資料庫中查詢得到的數據
可以的，Bundle它可以用key-value的形式存取數據，你可以把cursor中的數據存入bundle中，通過intent傳到下一個activity中
⑨ activity引擎 MySQL查詢不帶庫名
不帶庫名查詢不到。
不帶資料庫名稱他怎麼知道你要查哪裡呢。如果不帶的話就先use mydb再查了。
Activiti是由Alfresco軟體在2010年5月17日發布的業務流程管理(BPM)框架,它是覆蓋了業務流程管理，工作流，服務協作等領域的一個開源，靈活的，易擴展的可執行流程語言框架。Activiti基於Apache許可的開源BPM平台，創始人Tom Baeyens是JBoss JBPM的項目架構師，它的特色是提供了eclipse插件，開發人員可以通過插件直接繪畫出業務流程圖。
⑩ android 不同的activity訪問資料庫
把資料庫封裝好，在哪個activity訪問不是都一樣，直接調用增刪改查那些方法就好了