hzuapps#6 hzuapps#7 hzuapps#119 实验6、7未用到，做了课上的例子

students/net1814080903122/report/lab5.md

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+# 实验五
+
+## 一、实验目标
+
+1.了解Andoid的存储手段;
+2.掌握Android的文件存储;
+3.掌握Android的数据库存储.
+
+## 二、实验内容
+
+1. 将应用产生的数据存储到数据库
+2. 使用数据库存储
+
+## 三、实验步骤
+
+代码如下：
+
+```
+package edu.hzuapps.androidlabs.model;
+
+import android.app.Application;
+import android.database.Cursor;
+import android.database.sqlite.SQLiteDatabase;
+import android.util.Log;
+
+import java.lang.reflect.Method;
+import java.util.ArrayList;
+
+import edu.hzuapps.androidlabs.bean.ScheduleItem;
+
+public class SchedulesModel {
+    private static ArrayList<ScheduleItem> itemArrayList = new ArrayList<>();
+    private static int count = 0;
+    private static SQLiteDatabase db = null;
+    private static SchedulesModel schedulesModel = new SchedulesModel();
+    private SchedulesModel(){
+        String dbPath = ApplicationGetter.getCurApplication().getFilesDir().getAbsolutePath() + "schedule.db";
+        db = SQLiteDatabase.openOrCreateDatabase(dbPath,null);
+        seekorCreateTable();
+    }
+
+    private void seekorCreateTable(){
+        StringBuilder sql = new StringBuilder("create table if not exists schedule(");
+        sql.append("_id integer primary key autoincrement,");
+        sql.append("date text NOT NULL,");
+        sql.append("message text NOT NULL)");
+        db.execSQL(sql.toString());
+        count = count();
+        initItemArray();
+    }
+
+    public static SchedulesModel getInstance(){
+       return schedulesModel;
+    };
+    public int getCount() { return count; }
+
+    private int count() {
+        Cursor cursor = db.query("schedule", null, null, null, null, null, null);
+        int count = cursor.getCount();
+        cursor.close();
+        return count;
+    }
+
+
+    public static Object getItem(int position) {
+        return itemArrayList.get(position);
+    }
+
+
+    private void initItemArray(){
+        Cursor cursor = db.query("schedule", null, null, null, null, null, null);
+        if (cursor.moveToFirst()) {
+            int i = 0;
+            ScheduleItem item;
+            do {
+                item = new ScheduleItem(cursor.getInt(0),cursor.getString(1),cursor.getString(2));
+                itemArrayList.add(item);
+            }while(cursor.moveToNext());
+        }
+    }
+
+    private static class ApplicationGetter{
+        public static Application getCurApplication(){
+            Application application = null;
+            try{
+                Class atClass = Class.forName("android.app.ActivityThread");
+                Method currentApplicationMethod = atClass.getDeclaredMethod("currentApplication");
+                currentApplicationMethod.setAccessible(true);
+                application = (Application) currentApplicationMethod.invoke(null);
+                Log.d("fw_create","curApp class1:"+application);
+            }catch (Exception e){
+                Log.d("fw_create","e:"+e.toString());
+            }
+
+            if(application != null)
+                return application;
+            try{
+                Class atClass = Class.forName("android.app.AppGlobals");
+                Method currentApplicationMethod = atClass.getDeclaredMethod("getInitialApplication");
+                currentApplicationMethod.setAccessible(true);
+                application = (Application) currentApplicationMethod.invoke(null);
+                Log.d("fw_create","curApp class2:"+application);
+            }catch (Exception e){
+                Log.d("fw_create","e:"+e.toString());
+            }
+            return application;
+        }
+    }
+}
+
+```
+
+## 四、实验结果截图
+
+可以新增运动计划
+
+![lab5](lab5.png)
+
+## 五、实验心得
+
+通过这次实验学会了Andorid中的存储手段，这次使用了数据库存储，并掌握数据库存储。