团队冲刺01

今天没有做搜索功能的内容，学习了学习fragment，想做底部导航栏。

遇到的问题：界面画好了但是不知道怎么和以前现在方法连接起来，而且我发现好像和fragment相连的layout文件中写了ListView之后，运行程序不成功。

明天继续学习fragment，并做好搜索功能

ShowFragment.java:

import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.preference.PreferenceManager;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.ListView;

import androidx.annotation.Nullable;
import androidx.appcompat.widget.Toolbar;
import androidx.fragment.app.Fragment;

import com.google.android.material.floatingactionbutton.FloatingActionButton;

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

public class ShowFragment extends Fragment {
    final String TAG = "tag";
    /*private Context context = this;*/
    private NoteDatabase dbHelper;
    FloatingActionButton btn_add;
    private ListView lv_note;
    private NoteAdapter adapter;
    private List<Note> noteList = new ArrayList<Note>();
    private Toolbar myToolbar;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        View view = View.inflate(getActivity(),R.layout.fragment_show,null);

        /*btn_add = view.findViewById(R.id.btn_add);
        btn_add.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent = new Intent(MainActivity.this,EditActivity.class);
                intent.putExtra("mode",4);  //新建笔记的mode设为4
                startActivityForResult(intent,0);
            }
        });*/
        lv_note = view.findViewById(R.id.lv_note);
        //myToolbar = view.findViewById(R.id.Toolbar_main);
        /*setSupportActionBar(myToolbar);
        getSupportActionBar().setHomeButtonEnabled(true);
        getSupportActionBar().setDisplayHomeAsUpEnabled(true); */ //用自定义的工具栏代替本身的活动栏


        //初始化adapter
        adapter = new NoteAdapter(getActivity().getApplicationContext(),noteList);
        lv_note.setAdapter(adapter);

        lv_note.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                switch (parent.getId()) {
                    case R.id.lv_note:
                        Note curNote = (Note) parent.getItemAtPosition(position);
                        Intent intent = new Intent(getActivity(), EditActivity.class);
                        intent.putExtra("content", curNote.getContent());
                        intent.putExtra("id", curNote.getId());
                        intent.putExtra("time", curNote.getTime());
                        intent.putExtra("mode", 3);     // MODE of 'click to edit'  修改笔记的mode设为3
                        intent.putExtra("tag", curNote.getTag());
                        startActivityForResult(intent, 1);      //collect data from edit
                        Log.d(TAG, "onItemClick: " + position);
                        break;
                }
            }
        });
        refreshListView();
        return view;
    }




    @Override
    public void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {

        int returnMode;  //-1不改变 0创建一个新笔记 1修改当前笔记
        long note_id;
        returnMode = data.getExtras().getInt("mode",-1);
        note_id = data.getExtras().getLong("id",0);
        //修改笔记
        if(returnMode == 1){
            String content = data.getStringExtra("content");
            String time = data.getStringExtra("time");
            int tag = data.getExtras().getInt("tag",1);
            Note newNote = new Note(content,time,tag);
            newNote.setId(note_id);
            dao op = new dao(getActivity().getApplicationContext());
            op.open();
            op.updateNote(newNote);
            op.close();
            //refreshListView();
        }
        //新建笔记
        else if (returnMode == 0) {
            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);
            dao op = new dao(getActivity().getApplicationContext());
            op.open();
            op.addNote(newNote);
            op.close();
        }
        //删除笔记
        else if (returnMode == 2){
            Note delNote = new Note();
            delNote.setId(note_id);
            dao op = new dao(getActivity().getApplicationContext());
            op.open();
            op.removeNote(delNote);
            op.close();
        }
        refreshListView();
        super.onActivityResult(requestCode, resultCode, data);

    }
    //刷新页面，有问题 运行程序 有这段代码会闪退
    /*public void refreshListView(){
        dao op = new dao(getApplicationContext());
        if(noteList.size() > 0){
            noteList.clear();
        }
        noteList.addAll(op.getAllNotes());
        op.close();
        adapter.notifyDataSetChanged();
    }*/

    //导航栏上的图标
    /*@Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.main_menu,menu);
        return super.onCreateOptionsMenu(menu);
    }*/

    //刷新listview
    public void refreshListView() {
        SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(getActivity());

        dao op = new dao(getActivity().getApplicationContext());
        op.open();

        // set adapter
        if (noteList.size() > 0) noteList.clear();
        noteList.addAll(op.getAllNotes());
        /*if (sharedPreferences.getBoolean("reverseSort", false)) sortNotes(noteList, 2);
        else sortNotes(noteList, 1);*/
        op.close();
        adapter.notifyDataSetChanged();


    }

}