Android记事本NotePad应用功能拓展（二）

一、实现功能

1.NotaPad添加代办功能

2.点击待办事件添加计划Plan

3.点击记事本添加备忘录

二、项目代码分析

1.点击待办事件添加计划Plan

点击待办事件

String title = data.getExtras().getString("title", null);
            String content = data.getExtras().getString("content", null);
            String time = data.getExtras().getString("time", null);
            Plan newPlan = new Plan(title, content, time);
            com.example.atry.Alarm.CRUD op = new com.example.atry.Alarm.CRUD(context);
            op.open();
            op.addPlan(newPlan);
            Log.d(TAG, "onActivityResult: "+ time);
            op.close();

相关类分析

CRUD：对计划Plan的增删改查进行封装

EditAlarmActivity：对计划Plan细小操作的实现

PlanAdapter：连接Plan数据库的适配器接口

PlanDatabase：Plan数据库的具体实现

PlanAdapter

package com.example.atry.Alarm;

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 com.example.atry.R;

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

public class PlanAdapter extends BaseAdapter implements Filterable {
    private Context mContext;

    private List<Plan> backList;//用来备份原始数据
    private List<Plan> planList;//这个数据是会改变的，所以要有个变量来备份一下原始数据
    PlanAdapter.MyFilter mFilter;

    public PlanAdapter(Context mContext, List<Plan> planList) {
        this.mContext = mContext;
        this.planList = planList;
        backList = planList;
    }

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

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

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

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(mContext);
        mContext.setTheme((sharedPreferences.getBoolean("nightMode", false)? R.style.NightTheme: R.style.DayTheme));
        View v = View.inflate(mContext, R.layout.plan_layout, null);
        TextView tv_title = (TextView)v.findViewById(R.id.tv_title);
        TextView tv_content = (TextView)v.findViewById(R.id.tv_content);
        TextView tv_time = (TextView)v.findViewById(R.id.tv_time);

        //Set text for TextView
        tv_title.setText(planList.get(position).getTitle());
        tv_content.setText(planList.get(position).getContent());
        tv_time.setText(planList.get(position).getTime());

        //Save plan id to tag
        v.setTag(planList.get(position).getId());

        return v;
    }

    @Override
    public Filter getFilter() {
        if (mFilter ==null){
            mFilter = new PlanAdapter.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<Plan> 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 (Plan plan : backList) {
                    if (plan.getTitle().contains(charSequence) || plan.getContent().contains(charSequence)) {
                        list.add(plan);
                    }

                }
            }
            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;
        }
        //在publishResults方法中告诉适配器更新界面
        @Override
        protected void publishResults(CharSequence charSequence, FilterResults filterResults) {
            planList = (List<Plan>)filterResults.values;
            if (filterResults.count>0){
                notifyDataSetChanged();//通知数据发生了改变
            }else {
                notifyDataSetInvalidated();//通知数据失效
            }
        }
    }
}

2.点击记事本事件添加笔记Note

点击记事本事件

String content = data.getExtras().getString("content");
            String time = data.getExtras().getString("time");
            int tag = data.getExtras().getInt("tag", 1);
            Note newNote = new Note(content, time, tag);
            CRUD op = new CRUD(context);
            op.open();
            op.addNote(newNote);
            op.close();
            achievement.addNote(content);

相关类分析

CRUD：对计划Note的增删改查进行封装

EditActivity：对计划Note细小操作的实现

NoteAdapter：连接Note数据库的适配器接口

NoteDatabase：Note数据库的具体实现

NoteAdapter

package com.example.atry;

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 mContext;

    private List<Note> backList;//用来备份原始数据
    private List<Note> noteList;//这个数据是会改变的，所以要有个变量来备份一下原始数据
    private MyFilter mFilter;

    public NoteAdapter(Context mContext, List<Note> noteList) {
        this.mContext = 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(mContext);
        mContext.setTheme((sharedPreferences.getBoolean("nightMode", false)? R.style.NightTheme: R.style.DayTheme));
        View v = View.inflate(mContext, R.layout.note_layout, null);
        TextView tv_content = (TextView)v.findViewById(R.id.tv_content);
        TextView tv_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]);
        else tv_content.setText(allText);
        tv_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;
        }
        //在publishResults方法中告诉适配器更新界面
        @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
            }
        }
    }

}

四、参考资料

相关参考：Android记事本NotePad应用功能拓展（一）
作者GitHub下载链接：https://github.com/KangKangBigWorld/Android/tree/master/Mid_Test