对数据库增删改查的Demo增加了分页的功能

 

// 获得LinearLayout  

layout = (LinearLayout) findViewById(R.id.paging);
	// 用来存放动态生成的TextView
        ArrayList<TextView> list= new ArrayList<TextView>();

        // 获得数据库的记录总条数
        totalCount = getRowNum();
        Log.v("totalCount",totalCount+"");
        // 以每页5条数据划分显示，计算共有几页

int page = (int)Math.ceil(totalCount/5.0);
        Log.v("page",page+"");
        // 根据页数创建TextView对象

for(int i=1;i<=page;i++){
            TextView tv1 = new TextView(this);
            LayoutParams params = new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
            tv1.setLayoutParams(params);
            tv1.setText(i+" ");
            tv1.setGravity(Gravity.RIGHT);
    // 把TextView对象添加进list
            list.add(tv1);

            layout.addView(tv1);
        }
        
        // 对TextView的点击事件进行响应

for(int j=0;j<list.size();j++){
            list.get(j).setOnClickListener(new View.OnClickListener() {
                
                @Override
                public void onClick(View v) {
                    // 进行分页读取数据,暂定每页5条数据
                    Log.d("text",((TextView)v).getText().toString());
                    contentData(Integer.parseInt(((TextView)v).getText().toString().trim())-1);
                }

            });
        }

 

// 获取数据库里面总有的条数  

public int getRowNum(){

DOSQLiteHelper SQLiteHelper = new DOSQLiteHelper(FirstSQLiteApp.this);

SQLiteDatabase Database = SQLiteHelper.getReadableDatabase();

Cursor cursor = Database.query("CLASS_DB", null, null, null, null, null, null);

return cursor.getCount(); }

//更新及显示列表  

public void contentData(int Spage){

DOSQLiteHelper SQLiteHelper = new DOSQLiteHelper(FirstSQLiteApp.this);

SQLiteDatabase Database = SQLiteHelper.getReadableDatabase();

// LIMIT X OFFSET X*Y 是对数据库分页的重要语句，X=5是每次显示的数目条数，Y是表示第几页 

Cursor cursor = Database.rawQuery("select * from CLASS_DB LIMIT 5 OFFSET "+5*Spage, null);

cursor.moveToFirst();

SimpleCursorAdapter adapter = new SimpleCursorAdapter(this,android.R.layout.simple_list_item_2,cursor,new String[]{"NO","NAME"},new int[]{android.R.id.text1,android.R.id.text2});

setListAdapter(adapter);

Database.close(); }