词汇记录实战

这几天一直做这个实战，学习到了很多东西，并且自己加上了注释

 

 

MainActivity

package com.example.roombasic;

import androidx.appcompat.app.AppCompatActivity;
import androidx.navigation.NavController;
import androidx.navigation.fragment.NavHostFragment;
import androidx.navigation.ui.NavigationUI;
import android.os.Bundle;
public class MainActivity extends AppCompatActivity {
    NavController controller;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        NavHostFragment navHostFragment= (NavHostFragment) getSupportFragmentManager().findFragmentById(R.id.fragmentContainerView3);
        controller=navHostFragment.getNavController();
        NavigationUI.setupActionBarWithNavController(this, controller);//创建上面的箭头
    }



    @Override
    public boolean onSupportNavigateUp() {//使得上面的箭头可以用来返回
        controller.navigateUp();
        return super.onSupportNavigateUp();
    }
}

Word

package com.example.roombasic;

import androidx.room.ColumnInfo;
import androidx.room.Entity;
import androidx.room.PrimaryKey;

@Entity
public class Word {
    @PrimaryKey(autoGenerate = true)
    private int id;
    @ColumnInfo(name = "english_word")
    private String word;
    @ColumnInfo(name = "chinese_meaning")
    private String chineseMeaning;
    @ColumnInfo(name = "chinese_invisible")
    private boolean chineseInvisible;

    public boolean isChineseInvisible() {
        return chineseInvisible;
    }

    public void setChineseInvisible(boolean chineseInvisible) {
        this.chineseInvisible = chineseInvisible;
    }

    public Word(String word, String chineseMeaning) {
        this.word = word;
        this.chineseMeaning = chineseMeaning;
    }

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getWord() {
        return word;
    }

    public void setWord(String word) {
        this.word = word;
    }

    public String getChineseMeaning() {
        return chineseMeaning;
    }

    public void setChineseMeaning(String chineseMeaning) {
        this.chineseMeaning = chineseMeaning;
    }
}

WordViewModel

package com.example.roombasic;

import android.app.Application;
import androidx.annotation.NonNull;
import androidx.lifecycle.AndroidViewModel;
import androidx.lifecycle.LiveData;
import java.util.List;

public class WordViewModel extends AndroidViewModel {
    private final WordRepository wordRepository;
    public WordViewModel(@NonNull Application application) {
        super(application);
        wordRepository = new WordRepository(application);
    }

    LiveData<List<Word>> getAllWordsLive() {
        return wordRepository.getAllWordsLive();
    }
    LiveData<List<Word>> findWordsWithPattern(String pattern){
        return wordRepository.findWordsWithPattern(pattern);
    }

    void insertWords(Word... words) {
        wordRepository.insertWords(words);
    }
    void updateWords(Word... words) {
        wordRepository.updateWords(words);
    }
    void deleteWords(Word... words) {
        wordRepository.deleteWords(words);
    }
    void deleteAllWords() {
        wordRepository.deleteAllWords();
    }


}

WordRepository

package com.example.roombasic;

import android.app.Application;
import androidx.annotation.NonNull;
import androidx.lifecycle.AndroidViewModel;
import androidx.lifecycle.LiveData;
import java.util.List;

public class WordViewModel extends AndroidViewModel {
    private final WordRepository wordRepository;
    public WordViewModel(@NonNull Application application) {
        super(application);
        wordRepository = new WordRepository(application);
    }

    LiveData<List<Word>> getAllWordsLive() {
        return wordRepository.getAllWordsLive();
    }
    LiveData<List<Word>> findWordsWithPattern(String pattern){
        return wordRepository.findWordsWithPattern(pattern);
    }

    void insertWords(Word... words) {
        wordRepository.insertWords(words);
    }
    void updateWords(Word... words) {
        wordRepository.updateWords(words);
    }
    void deleteWords(Word... words) {
        wordRepository.deleteWords(words);
    }
    void deleteAllWords() {
        wordRepository.deleteAllWords();
    }


}

WordDao

package com.example.roombasic;

import androidx.lifecycle.LiveData;
import androidx.room.Dao;
import androidx.room.Delete;
import androidx.room.Insert;
import androidx.room.Query;
import androidx.room.Update;

import java.util.List;
//dao层，增删改查数据
@Dao   // Database access object
public interface WordDao {
    @Insert
    void insertWords(Word... words);

    @Update
    void updateWords(Word... words);

    @Delete
    void deleteWords(Word... words);

    @Query("DELETE FROM WORD")
    void deleteAllWords();

    @Query("SELECT * FROM WORD ORDER BY ID DESC")
    LiveData<List<Word>>getAllWordsLive();
    @Query("SELECT * FROM WORD WHERE english_word LIKE :pattern ORDER BY ID DESC")
    LiveData<List<Word>>findWordWithPattern(String pattern);

}

WordDataBase

package com.example.roombasic;

import android.content.Context;
import androidx.room.Database;
import androidx.room.Room;
import androidx.room.RoomDatabase;

//singleton
@Database(entities = {Word.class}, version = 1, exportSchema = false)
public abstract class WordDatabase extends RoomDatabase {
    private static WordDatabase INSTANCE;
    static synchronized WordDatabase getDatabase(Context context){
        if(INSTANCE==null){
            INSTANCE= Room.databaseBuilder(context.getApplicationContext(),WordDatabase.class,"word_database").build();
        }
        return INSTANCE;
    }
    public abstract WordDao getWordDao();
}

MyAdapter

package com.example.roombasic;

import android.annotation.SuppressLint;
import android.content.Intent;
import android.net.Uri;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.CompoundButton;
import android.widget.Switch;
import android.widget.TextView;

import androidx.annotation.NonNull;
import androidx.recyclerview.widget.RecyclerView;

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

public class MyAdapter extends RecyclerView.Adapter<MyAdapter.MyViewHolder> {
    private List<Word> allWords = new ArrayList<>();
    private boolean useCardView;
    private WordViewModel wordViewModel;

    MyAdapter(boolean useCardView, WordViewModel wordViewModel) {//构造函数
        this.useCardView = useCardView;
        this.wordViewModel = wordViewModel;
    }

    void setAllWords(List<Word> allWords) {
        this.allWords = allWords;
    }

    @NonNull
    @Override
    public MyViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        LayoutInflater layoutInflater = LayoutInflater.from(parent.getContext());
        View itemView;
        if (useCardView) {//分别将两种界面赋值给itView
            itemView = layoutInflater.inflate(R.layout.cell_card_2,parent,false);
        } else {
            itemView = layoutInflater.inflate(R.layout.cell_normal,parent,false);
        }
        MyViewHolder holder=new MyViewHolder(itemView);//实例化MyViewHolder
        holder.itemView.setOnClickListener(new View.OnClickListener() {//点击itView触发事件
            @Override
            public void onClick(View view) {
                Uri uri = Uri.parse("https://m.youdao.com/dict?le=eng&q=" + holder.textViewEnglish.getText());
                Intent intent = new Intent(Intent.ACTION_VIEW);
                intent.setData(uri);
                holder.itemView.getContext().startActivity(intent);
            }
        });
        holder.aSwitchChineseInvisible.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {//触发开关事件
            @Override
            public void onCheckedChanged(CompoundButton compoundButton, boolean b) {
                Word word=(Word)holder.itemView.getTag(R.id.word_foe_view_holder);
                if (b) {
                    holder.textViewChinese.setVisibility(View.GONE);//当开关触发时，使得textViewChinese完全消失
                    word.setChineseInvisible(true);//更改数据
                    wordViewModel.updateWords(word);//将数据同步到数据库
                } else {
                    holder.textViewChinese.setVisibility(View.VISIBLE);
                    word.setChineseInvisible(false);
                    wordViewModel.updateWords(word);
                }

            }
        });

        return holder;
    }

    @Override
    public void onBindViewHolder(@NonNull final MyViewHolder holder, final int position) {
        final Word word = allWords.get(position);//从头逐个获取word
        holder.itemView.setTag(R.id.word_foe_view_holder,word);
        holder.textViewNumber.setText(String.valueOf(position + 1));
        holder.textViewEnglish.setText(word.getWord());
        holder.textViewChinese.setText(word.getChineseMeaning());
        if (word.isChineseInvisible()) {// 根据数据库中数据的值，来确定要不要保留中文
            holder.textViewChinese.setVisibility(View.GONE);
            holder.aSwitchChineseInvisible.setChecked(true);
        } else {
            holder.textViewChinese.setVisibility(View.VISIBLE);
            holder.aSwitchChineseInvisible.setChecked(false);
        }
    }

    @Override
    public int getItemCount() {
        return allWords.size();
    }

    static class MyViewHolder extends RecyclerView.ViewHolder {//绑定各个控件
        TextView textViewNumber,textViewEnglish,textViewChinese;
        Switch aSwitchChineseInvisible;
        MyViewHolder(@NonNull View itemView) {
            super(itemView);
            textViewNumber = itemView.findViewById(R.id.textViewNumber);
            textViewEnglish = itemView.findViewById(R.id.textViewEnglish);
            textViewChinese = itemView.findViewById(R.id.textViewChinese);
            aSwitchChineseInvisible = itemView.findViewById(R.id.switchChineseInvisible);
        }
    }
}

WordFragment

package com.example.roombasic;

import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.SearchView;

import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.fragment.app.Fragment;
import androidx.lifecycle.LiveData;
import androidx.lifecycle.Observer;
import androidx.lifecycle.ViewModelProvider;
import androidx.navigation.NavController;
import androidx.navigation.Navigation;
import androidx.recyclerview.widget.ItemTouchHelper;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;

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

import java.util.List;

/**
 * A simple {@link Fragment} subclass.
 */
public class WordFragment extends Fragment {
    private WordViewModel wordViewModel;
    private RecyclerView recyclerView;
    private MyAdapter myAdapter1, myAdapter2;
    private LiveData<List<Word>> filteredWords;
    private static final String VIEW_TYPE_SHP = "view_type";
    private static final String IS_USING_CARD_VIEW = "is_using";
    private List<Word> allWords;

    public WordFragment() {
        // Required empty public constructor
        setHasOptionsMenu(true);
    }

    @Override
    public boolean onOptionsItemSelected(@NonNull MenuItem item) {      //右上角的三个点对应的菜单
        switch (item.getItemId()) {
            case R.id.cleardata://清空数据
                AlertDialog.Builder builder = new AlertDialog.Builder(requireActivity());//创建对话框，用于清除数据是否确认
                builder.setTitle("是否清空数据");
                builder.setPositiveButton("确定", new DialogInterface.OnClickListener() {//确认按钮键
                    @Override
                    public void onClick(DialogInterface dialogInterface, int i) {
                        wordViewModel.deleteAllWords();
                    }
                });
                builder.setNegativeButton("取消", new DialogInterface.OnClickListener() {//取消按钮键
                    @Override
                    public void onClick(DialogInterface dialogInterface, int i) {
                    }
                });
                builder.create();//创建
                builder.show();//展示
                break;//跳出switch
            case R.id.switchview://切换视图
                SharedPreferences shp = requireActivity().getSharedPreferences(VIEW_TYPE_SHP, Context.MODE_PRIVATE);//键值保存
                boolean viewType = shp.getBoolean(IS_USING_CARD_VIEW, false);
                SharedPreferences.Editor editor = shp.edit();
                if (viewType) {
                    recyclerView.setAdapter(myAdapter1);
                    editor.putBoolean(IS_USING_CARD_VIEW, false);
                } else {
                    recyclerView.setAdapter(myAdapter2);
                    editor.putBoolean(IS_USING_CARD_VIEW, true);
                }
                editor.apply();

        }
        return super.onOptionsItemSelected(item);
    }

    @Override
        public void onCreateOptionsMenu(@NonNull Menu menu, @NonNull MenuInflater inflater) {//在WordFragment上绑定新建的菜单资源
        super.onCreateOptionsMenu(menu, inflater);
        inflater.inflate(R.menu.mai_menu, menu);
        SearchView searchView = (SearchView) menu.findItem(R.id.app_bar_search).getActionView();//绑定搜索键
        searchView.setMaxWidth(600);
        searchView.setOnQueryTextListener(new SearchView.OnQueryTextListener() {//添加搜索键功能
            @Override
            public boolean onQueryTextSubmit(String s) {
                return false;
            }

            @Override
            public boolean onQueryTextChange(String s) {
                String pattern = s.trim();//去除多余空格
                filteredWords.removeObservers(requireActivity());//在使用模糊查询之前，要先把之前的观察者移除掉，把96行的观察者移除掉
                filteredWords = wordViewModel.findWordsWithPattern(pattern);//获取返回的模糊查询的数据列表
                filteredWords.observe(requireActivity(), new Observer<List<Word>>() {
                    @Override
                    public void onChanged(List<Word> words) {
                        int temp = myAdapter1.getItemCount();
                        allWords = words;
                        myAdapter1.setAllWords(words);
                        myAdapter2.setAllWords(words);
                        if (temp != words.size()) {
                            myAdapter1.notifyDataSetChanged();
                            myAdapter2.notifyDataSetChanged();
                        }
                    }
                });
                return true;
            }
        });
    }

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

        return inflater.inflate(R.layout.fragment_word, container, false);
    }


    @Override
    public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);
        wordViewModel = new ViewModelProvider(requireActivity(), ViewModelProvider.AndroidViewModelFactory.getInstance(getActivity().getApplication())).get(WordViewModel.class);
        recyclerView = requireActivity().findViewById(R.id.word_recycle);
        recyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));//设置数据垂直放置
        myAdapter1 = new MyAdapter(false, wordViewModel);
        myAdapter2 = new MyAdapter(true, wordViewModel);
        SharedPreferences shp = requireActivity().getSharedPreferences(VIEW_TYPE_SHP, Context.MODE_PRIVATE);
        boolean viewType = shp.getBoolean(IS_USING_CARD_VIEW, false);
        if (viewType) {
            recyclerView.setAdapter(myAdapter2);
        } else {
            recyclerView.setAdapter(myAdapter1);
        }
        filteredWords = wordViewModel.getAllWordsLive();
        filteredWords.observe(requireActivity(), new Observer<List<Word>>() {
            @Override
            public void onChanged(List<Word> words) {
                int temp = myAdapter1.getItemCount();
                allWords = words;
                myAdapter1.setAllWords(words);
                myAdapter2.setAllWords(words);
                if (temp != words.size()) {
                    myAdapter1.notifyDataSetChanged();
                    myAdapter2.notifyDataSetChanged();
                }
            }
        });
        new ItemTouchHelper(new ItemTouchHelper.SimpleCallback(0, ItemTouchHelper.START | ItemTouchHelper.END) {//使得view可以左滑，右滑；还可以上滑下滑
            @Override
            public boolean onMove(@NonNull RecyclerView recyclerView, @NonNull RecyclerView.ViewHolder viewHolder, @NonNull RecyclerView.ViewHolder target) {
                return false;
            }

            @Override
            public void onSwiped(@NonNull RecyclerView.ViewHolder viewHolder, int direction) {
                Word word = allWords.get(viewHolder.getAdapterPosition());
                wordViewModel.deleteWords(word);
                Snackbar.make(requireActivity().findViewById(R.id.wordsFragmentView), "删除了一个词汇", Snackbar.LENGTH_SHORT)//弹出一个小窗口，可以做出操作
                        .setAction("撤销", new View.OnClickListener() {//设置小窗口上的操作
                            @Override
                            public void onClick(View view) {
                                wordViewModel.insertWords(word);
                            }
                        }).show();

            }
        }).attachToRecyclerView(recyclerView);//让上述写的东西连接上recycleView。
        FloatingActionButton floatingActionButton = requireActivity().findViewById(R.id.floatingActionButton);//绑定悬浮按钮
        floatingActionButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                NavController controller = Navigation.findNavController(view);//点击跳转界面
                controller.navigate(R.id.action_wordFragment_to_addFragment);
            }
        });
    }

}

AddFragment

package com.example.roombasic;

import android.content.Context;
import android.os.Bundle;

import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.fragment.app.Fragment;
import androidx.lifecycle.ViewModelProvider;
import androidx.navigation.NavController;
import androidx.navigation.Navigation;

import android.text.Editable;
import android.text.TextWatcher;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.inputmethod.InputMethodManager;
import android.widget.Button;
import android.widget.EditText;

/**
 * A simple {@link Fragment} subclass.

 */
public class AddFragment extends Fragment {
    private Button buttonSubmit;
    private EditText editTextEnglish,editTextChinese;
    private WordViewModel wordViewModel;
    public AddFragment() {
        // Required empty public constructor
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        return inflater.inflate(R.layout.fragment_add, container, false);
    }

    @Override
    public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);
        wordViewModel=new ViewModelProvider(requireActivity(),ViewModelProvider.AndroidViewModelFactory.getInstance(requireActivity().getApplication())).get(WordViewModel.class);
        buttonSubmit=requireActivity().findViewById(R.id.buttonsubmit);
        editTextEnglish=requireActivity().findViewById(R.id.editTextTextEnglish);
        editTextChinese=requireActivity().findViewById(R.id.editTextTextChinese);
        buttonSubmit.setEnabled(false);//使得一开始按钮不可用
        editTextEnglish.requestFocus();//获取焦点
        InputMethodManager imm= (InputMethodManager) requireActivity().getSystemService(Context.INPUT_METHOD_SERVICE);
        imm.showSoftInput(editTextEnglish,0);//设置键盘在editTextEnglish时自动弹出
        TextWatcher textWatcher=new TextWatcher() {//监视文本变化
            @Override
            public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) {

            }

            @Override
            public void onTextChanged(CharSequence charSequence, int i, int i1, int i2) {
                String english=editTextEnglish.getText().toString().trim();
                String chinese=editTextChinese.getText().toString().trim();
                buttonSubmit.setEnabled(!english.isEmpty()&&!chinese.isEmpty());//当文本框都不为空的时候，按键可用
            }

            @Override
            public void afterTextChanged(Editable editable) {

            }
        };
        editTextEnglish.addTextChangedListener(textWatcher);//将设置的监视文本变化添加到editTextEnglish
        editTextChinese.addTextChangedListener(textWatcher);//将设置的监视文本变化添加到editTextChinese
        buttonSubmit.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {//将要添加的单词进行处理
                String english=editTextEnglish.getText().toString().trim();
                String chinese=editTextChinese.getText().toString().trim();
                Word word=new Word(english,chinese);
                wordViewModel.insertWords(word);
                NavController controller= Navigation.findNavController(view);//跳转
                controller.navigateUp();
            }
        });
    }

}

activity_main.xml

 

 fragment_word.xml

 

 fragment_add.xml

 

 cell_normal.xml

 

 cell_card_2.xml

 

 mai_menu.xml

 

 navigation.xml

 

标签：实战,词汇,word,androidx,void,记录,import,android,public
来源： https://www.cnblogs.com/nian-nian/p/15828765.html