团队冲刺02

  今天写了数据库的相关操作，可实现新笔记的添加

  遇到的问题：写了添加之后刷新页面的函数，运行时会闪退，已解决

  明天实现笔记显示界面的美化

NoteDatabase.java:

import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;

public class NoteDatabase extends SQLiteOpenHelper {

    public static final String TABLE_NAME = "notes";
    public static final String CONTENT = "content";
    public static final String ID = "_id";
    public static final String TIME = "time";
    public static final String MODE = "mode";

    public NoteDatabase(Context context){
        super(context, "notes", null, 1);
    }

    @Override
    public void onCreate(SQLiteDatabase db) {
        db.execSQL("CREATE TABLE "+ TABLE_NAME
                + "("
                + ID + " INTEGER PRIMARY KEY AUTOINCREMENT,"
                + CONTENT + " TEXT NOT NULL,"
                + TIME + " TEXT NOT NULL,"
                + MODE + " INTEGER DEFAULT 1)"
        );
    }

    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
        /*for(int i = oldVersion; i < newVersion; i++) {
            switch (i) {
                case 1:
                    break;
                case 2:
                    updateMode(db);
                default:
                    break;
            }
        }*/
    }
}

NoteAdapter.java:

import android.content.Context;
import android.content.SharedPreferences;
import android.preference.PreferenceManager;
import android.text.TextUtils;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.Filter;
import android.widget.Filterable;
import android.widget.TextView;

import java.util.ArrayList;
import java.util.List;

public class NoteAdapter extends BaseAdapter implements Filterable {

    private Context context;
    private List<Note> backList; //备份原始数据
    private List<Note> noteList;
    private MyFilter mFilter;

    public NoteAdapter(Context mContext,List<Note> noteList){
        this.context = mContext;
        this.noteList = noteList;
        backList = noteList;
    }

    @Override
    public int getCount() {
        return noteList.size();
    }

    @Override
    public Object getItem(int position) {
        return noteList.get(position);
    }

    @Override
    public long getItemId(int position) {
        return position;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(context);
        context.setTheme(R.style.DayTheme);
        View v = View.inflate(context,R.layout.note_layout,null);
        TextView content = (TextView)v.findViewById(R.id.tv_content);
        TextView time = (TextView)v.findViewById(R.id.tv_time);
        //Set text for TextView
        String allText = noteList.get(position).getContent();
        /*if (sharedPreferences.getBoolean("noteTitle" ,true))
            tv_content.setText(allText.split("\n")[0]);*/
        content.setText(allText);
        time.setText(noteList.get(position).getTime());

        //Save note id to tag
        v.setTag(noteList.get(position).getId());

        return v;
    }


    @Override
    public Filter getFilter() {
        if (mFilter ==null){
            mFilter = new MyFilter();
        }
        return mFilter;
    }

    class MyFilter extends Filter {
        //我们在performFiltering(CharSequence charSequence)这个方法中定义过滤规则
        @Override
        protected FilterResults performFiltering(CharSequence charSequence) {
            FilterResults result = new FilterResults();
            List<Note> list;
            if (TextUtils.isEmpty(charSequence)) {//当过滤的关键字为空的时候，我们则显示所有的数据
                list = backList;
            } else {//否则把符合条件的数据对象添加到集合中
                list = new ArrayList<>();
                for (Note note : backList) {
                    if (note.getContent().contains(charSequence)) {
                        list.add(note);
                    }

                }
            }
            result.values = list; //将得到的集合保存到FilterResults的value变量中
            result.count = list.size();//将集合的大小保存到FilterResults的count变量中

            return result;
        }

        @Override
        protected void publishResults(CharSequence charSequence, FilterResults filterResults) {
            noteList = (List<Note>)filterResults.values;
            if (filterResults.count > 0){
                notifyDataSetChanged();//通知数据发生了改变
            }else {
                notifyDataSetInvalidated();//通知数据失效
            }
        }
    }


}