标签：04 private 冲刺 new import android 团队 id op

今天解决了ListView不显示数据的问题，终于弄清楚了这个逻辑，原来根本没有把新建的信息存入数据库，把onActivityResult写在了fragment里。

  遇到的问题：现在添加之后不能时时刷新ListView，尝试在Adapter中写了一个刷新的函数，调用时一直空指针错误。adapter.notifyDataSetChanged()不执行；

  明天解决这一问题。

import android.app.Activity;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.SharedPreferences;
import android.graphics.Color;
import android.graphics.drawable.ColorDrawable;
import android.os.Bundle;
import android.preference.PreferenceManager;
import android.text.TextUtils;
import android.util.DisplayMetrics;
import android.util.Log;
import android.util.SparseArray;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.view.WindowManager;
import android.widget.AdapterView;
import android.widget.EditText;
import android.widget.FrameLayout;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.PopupWindow;
import android.widget.RadioGroup;
import android.widget.RelativeLayout;
import android.widget.TextView;
import android.widget.Toast;
import android.widget.Toolbar;

import androidx.annotation.Nullable;
import androidx.appcompat.app.AlertDialog;
import androidx.appcompat.app.AppCompatActivity;
import androidx.fragment.app.Fragment;
import androidx.fragment.app.FragmentManager;
import androidx.fragment.app.FragmentTransaction;

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

import static android.view.View.GONE;


public class MainActivity extends AppCompatActivity implements View.OnClickListener{


    private FrameLayout fragment_container;
    private FragmentManager manager;
    private FragmentTransaction transaction;
    private Bundle mBundle;

    private Toolbar myToolbar;

    final String TAG = "tag";
    private Context context = this;
    private List<Note> noteList = new ArrayList<Note>();
    private NoteAdapter adapter;

    private PopupWindow popupWindow; // 左侧弹出菜单
    private PopupWindow popupCover; // 菜单蒙版
    private LayoutInflater layoutInflater;
    private RelativeLayout main;
    private ViewGroup customView;
    private ViewGroup coverView;
    private WindowManager wm;
    private DisplayMetrics metrics;
    private TagAdapter tagAdapter;

    private TextView setting_text;
    private ImageView setting_image;
    private ListView lv_tag;
    private TextView add_tag;

    private ShowFragment showFragment;
    private CycleFragment cycleFragment;
    private SettingFragment settingFragment;
    private MyFragment myFragment;

    private ImageView add;

    private int mode;
    private int tag;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(getContentViewResource());
        initView();
        initData();
        initList();
        add = findViewById(R.id.sign_iv);
        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);

            }
        });


        //将主页添加到第一个fragment中，即默认fragment
        ShowFm = new ShowFragment();
        getSupportFragmentManager().beginTransaction().add(R.id.fragment_container, ShowFm).commit();

        //取得用户id值
        /*Intent intent = getIntent();
        mIdKey = intent.getIntExtra("idKey", 0);*/
        Intent intent = getIntent();
        mode = intent.getIntExtra("mode",0);

    }


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

        Log.d(TAG, "onActivityResult: panduan");
        int returnMode;  //-1不改变 0创建一个新笔记 1修改当前笔记
        long note_id;/*
        Bundle bundle = data.getExtras();
        returnMode = bundle.getInt("mode",0);*/
        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(this);
            op.open();
            op.updateNote(newNote);
            op.close();
            //refreshListView();
        }
        //新建笔记
        else if (returnMode == 0) {
            Log.d(TAG, "onActivityResult: xinjianbiji");
            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(this);
            op.open();
            Log.d(TAG, "onActivityResult: tianjiadhujukujinqu");
            op.addNote(newNote);
            op.close();
            //adapter.reflesh(noteList);
            //refreshListView();
        }
        //删除笔记
        else if (returnMode == 2){
            Note delNote = new Note();
            delNote.setId(note_id);
            dao op = new dao(this);
            op.open();
            op.removeNote(delNote);
            op.close();
        }

        //refreshListView();
        super.onActivityResult(requestCode, resultCode, data);
    }


    //private FrameLayout fragment_container;
    private RadioGroup rg;
    private Fragment ShowFm = null,CycleFm = null, SettingFm = null, MyFm = null;

    @Override
    public void onClick(View v) {

    }


    private final class RadioGroupOnCheckedChangeListener implements RadioGroup.OnCheckedChangeListener {
        @Override
        public void onCheckedChanged(RadioGroup radioGroup, int checkedId) {
            if (ShowFm != null) {
                getSupportFragmentManager().beginTransaction().hide(ShowFm).commit();
            }
            if (CycleFm != null) {
                getSupportFragmentManager().beginTransaction().hide(CycleFm).commit();
            }
            if (SettingFm != null) {
                getSupportFragmentManager().beginTransaction().hide(SettingFm).commit();
            }
            if (MyFm != null) {
                getSupportFragmentManager().beginTransaction().hide(MyFm).commit();
            }
            switch (checkedId) {
                case R.id.record_tab:
                    if (ShowFm == null) {
                        ShowFm = new ShowFragment();
                        getSupportFragmentManager().beginTransaction().add(R.id.fragment_container, ShowFm).commit();
                    } else {
                        getSupportFragmentManager().beginTransaction().show(ShowFm).commit();
                    }
                    break;
                case R.id.cycle_tab:
                    if (CycleFm == null) {
                        CycleFm = new CycleFragment();
                        getSupportFragmentManager().beginTransaction().add(R.id.fragment_container, CycleFm).commit();
                    } else {
                        getSupportFragmentManager().beginTransaction().show(CycleFm).commit();
                    }
                    break;

                case R.id.settings_tab:
                    if (SettingFm == null) {
                        SettingFm = new SettingFragment();
                        getSupportFragmentManager().beginTransaction().add(R.id.fragment_container, SettingFm).commit();
                    } else {
                        getSupportFragmentManager().beginTransaction().show(SettingFm).commit();
                    }
                    break;
                case R.id.my_tab:
                    if (MyFm == null) {
                        MyFm = new MyFragment();
                        getSupportFragmentManager().beginTransaction().add(R.id.fragment_container, MyFm).commit();
                    } else {
                        getSupportFragmentManager().beginTransaction().show(MyFm).commit();
                    }
                    break;
            }
        }
    }


    public int getContentViewResource() {
        return R.layout.activity_main;
    }

    private SparseArray<Fragment> mFragmentSparseArray;

    protected void initView() {
        fragment_container = findViewById(R.id.fragment_container);
        rg = findViewById(R.id.tabs_rg);

    }


    protected void initData() {
    }


    protected void initList() {
        rg.setOnCheckedChangeListener(new RadioGroupOnCheckedChangeListener());
        rg.check(R.id.record_tab);
    }
}

package com.example.jishibenceshi;


import android.app.Activity;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.SharedPreferences;
import android.database.sqlite.SQLiteDatabase;
import android.graphics.Color;
import android.graphics.drawable.ColorDrawable;
import android.os.Bundle;
import android.preference.PreferenceManager;
import android.text.TextUtils;
import android.util.DisplayMetrics;
import android.util.Log;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.view.WindowManager;
import android.widget.AdapterView;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.PopupWindow;
import android.widget.RelativeLayout;
import android.widget.TextView;
import android.widget.Toast;

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

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

import static android.view.View.GONE;
import static androidx.core.os.LocaleListCompat.create;

public class ShowFragment extends Fragment {


    /*public ShowFragment(String context){
        this.context = context;
    }*/

    private SharedPreferences deleteAll_confirm;
    private Passworddao mPwdDataManager;

    public static final String ARGUMENT = "argument";
    private String mArgument;

    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;

    private PopupWindow popupWindow; // 左侧弹出菜单
    private PopupWindow popupCover; // 菜单蒙版
    private LayoutInflater layoutInflater;
    private RelativeLayout main;
    private ViewGroup customView;
    private ViewGroup coverView;
    private WindowManager wm;
    private DisplayMetrics metrics;
    private TagAdapter tagAdapter;

    private TextView setting_text;
    private ImageView setting_image;
    private ListView lv_tag;
    private TextView add_tag;


    /*public ShowFragment() {

    }*/
    @Override
    public void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);

    }

    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {

        View view = inflater.inflate(R.layout.fragment_show, container, false);

        lv_note = (ListView) view.findViewById(R.id.lv_note);
        myToolbar = view.findViewById(R.id.Toolbar_main);
        ((AppCompatActivity) getActivity()).setSupportActionBar(myToolbar);
        setHasOptionsMenu(true);
        //setSupportActionBar(myToolbar);
        //getSupportActionBar().setHomeButtonEnabled(true);
        //getSupportActionBar().setDisplayHomeAsUpEnabled(true);  //用自定义的工具栏代替本身的活动栏


        Bundle bundle = getArguments();
        if (bundle != null)
            mArgument = bundle.getString(ARGUMENT);

        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;
                }
            }
        });

        //初始化adapter
        adapter = new NoteAdapter(this.getActivity(), noteList);
        lv_note.setAdapter(adapter);
        refreshListView();
        //return inflater.inflate(R.layout.fragment_show, container, false);
        return view;
    }


    public static ShowFragment newInstance(String argument) {
        Bundle bundle = new Bundle();
        bundle.putString(ARGUMENT, argument);
        ShowFragment contentFragment = new ShowFragment();
        contentFragment.setArguments(bundle);
        return contentFragment;
    }


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

        Log.d(TAG, "onActivityResult: shujukutianru");
        int returnMode;  //-1不改变 0创建一个新笔记 1修改当前笔记
        long note_id;
        Bundle bundle = data.getExtras();
        returnMode = bundle.getInt("mode", 0);
        //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(getContext().getApplicationContext());
            op.open();
            op.updateNote(newNote);
            op.close();
            //refreshListView();
        }
        //新建笔记
        else if (returnMode == 0) {
            Log.d(TAG, "onActivityResult: xinjianbiji");
            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(getContext().getApplicationContext());
            op.open();
            Log.d(TAG, "onActivityResult: tianjiadhujukujinqu");
            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(getContext().getApplicationContext());
            op.open();
            op.removeNote(delNote);
            op.close();
        }
        refreshListView();
        super.onActivityResult(requestCode, resultCode, data);
    }


    //导航栏上的图标
    @Override
    public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
        /*getMenuInflater().inflate(R.menu.main_menu,menu);
        return super.onCreateOptionsMenu(menu);*/
        Log.e(TAG, "onCreateOptionsMenu()");
        menu.clear();
        inflater.inflate(R.menu.main_menu, menu);

        MenuItem mSearch = menu.findItem(R.id.action_search);
        SearchView mSearchView = (SearchView) mSearch.getActionView();

        mSearchView.setQueryHint("Search");
        mSearchView.setOnQueryTextListener(new SearchView.OnQueryTextListener() {
            @Override
            public boolean onQueryTextSubmit(String query) {
                return false;
            }

            @Override
            public boolean onQueryTextChange(String newText) {
                adapter.getFilter().filter(newText);
                return false;
            }
        });

        super.onCreateOptionsMenu(menu, inflater);
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()) {
            case R.id.menu_clear:
                /*new AlertDialog.Builder(this.getActivity())
                        .setTitle("确认全部删除嘛？")
                        .setMessage("删除全部吗？")
                        .setPositiveButton(android.R.string.yes, new DialogInterface.OnClickListener() {
                            public void onClick(DialogInterface dialog, int which) {
                                Note delNote = new Note();
                                //delNote.setId(note_id);
                                dao op = new dao(getContext().getApplicationContext());
                                op.open();
                                op.removeAllNote(noteList);
                                op.close();
                            }

                                *//*dbHelper = new NoteDatabase(getContext());
                                SQLiteDatabase db = dbHelper.getWritableDatabase();
                                db.delete("notes", null, null);
                                db.execSQL("update sqlite_sequence set seq=0 where name='notes'");*//*
                               // refreshListView();

                        }).setNegativeButton(android.R.string.no, new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        dialog.dismiss();
                    }
                }).create().show();
                break;*/

                AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
                builder.setTitle("确认全部删除嘛？");
                builder.setMessage("请输入密码");
                View view = getLayoutInflater().inflate(R.layout.alert_password_entry, null);
                final EditText et_pwd = (EditText) view.findViewById(R.id.input_pwd);
                builder.setView(view);//设置login_layout为对话提示框
                //设置正面按钮，并做事件处理
                builder.setPositiveButton("确定", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialogInterface, int i) {
                        String input_password = et_pwd.getText().toString().trim();
                        //SharedPreferences.Editor editor =deleteAll_confirm.edit();
                        Note delNote = new Note();
                        //delNote.setId(note_id);
                        dao op = new dao(getContext().getApplicationContext());
                        op.open();
                        op.removeAllNote(noteList);
                        op.close();
                        Toast.makeText(getActivity(), "删除成功", Toast.LENGTH_SHORT).show();
                        /*int result=mPwdDataManager.findPassword(input_password);
                        if(result==1) {         //返回1说明密码正确
                            //保存用户名和密码
                            //editor.putString("PASSWORD", input_password);

                            Note delNote = new Note();
                            //delNote.setId(note_id);
                            dao op = new dao(getContext().getApplicationContext());
                            op.open();
                            op.removeAllNote(noteList);
                            op.close();
                            Toast.makeText(getActivity(), "删除成功", Toast.LENGTH_SHORT).show();
                        }
                        else {
                            Toast.makeText(getActivity(), "密码不正确", Toast.LENGTH_SHORT).show();
                        }*/
                        refreshListView();
                    }
                });
                //设置反面按钮，并做事件处理
                builder.setNegativeButton("取消", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialogInterface, int i) {
                        Toast.makeText(getActivity(), "取消删除", Toast.LENGTH_SHORT).show();
                    }
                });
                builder.show();//显示Dialog对话框

                break;

        }
        return super.onOptionsItemSelected(item);
    }

    //刷新listview
    public void refreshListView() {
        Log.d(TAG, "refreshListView: ");
        SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(this.getActivity());

        dao op = new dao(this.getActivity());
        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();
    }


}

标签：04,private,冲刺,new,import,android,团队,id,op
来源： https://www.cnblogs.com/9d629/p/16373004.html

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