android - 使用 EditText 在 RecyclerView 中搜索

Question

我编写这段代码用于在 recyclerview 中使用编辑文本进行搜索，但是，当我运行应用程序并输入我需要在第一个字母的编辑文本上搜索它的文本时，回收站内容没有改变，当我输入second Letter RecyclerView 变空了。我怎样才能过滤回收站？我的代码有什么问题？xml代码:

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".FamilyActivity">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">

        <EditText
            android:id="@+id/search"
            android:layout_width="294dp"
            android:layout_height="70dp"
            android:layout_marginTop="-20dp"
            android:hint="Search ..."
            android:drawableLeft="@drawable/ic_search_black_24dp"
            />

        <Button
            android:id="@+id/add"
            android:layout_width="54dp"
            android:layout_height="match_parent"
            android:layout_marginLeft="35dp"
            android:drawableTop="@drawable/ic_person_add_black_24dp"
            android:onClick="add_new_family"
            tools:ignore="OnClick" />
    </LinearLayout>



    <android.support.v7.widget.RecyclerView
        android:id="@+id/recyclerView"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"


        android:layout_alignParentStart="true"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true"
        android:layout_marginStart="0dp"
        android:layout_marginLeft="0dp"
        android:layout_marginTop="50dp"></android.support.v7.widget.RecyclerView>

</RelativeLayout>

主要 Activity 中的代码:

public class FamilyActivity extends AppCompatActivity {
    RecyclerView recyclerView;
    FamilyAdapter familyAdapter;
    Button add_family;
    EditText search;

    List<Family> familyList;
    String patientID = "";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_family);
        add_family=(Button)findViewById(R.id.add);
        search =(EditText)findViewById(R.id.search);

        familyList = new ArrayList<>();
        recyclerView = (RecyclerView) findViewById(R.id.recyclerView);
        recyclerView.setHasFixedSize(true);
        recyclerView.setLayoutManager(new LinearLayoutManager(this));
        Bundle extras = getIntent().getExtras();
        if (extras != null) {
            patientID = extras.getString("ID");
        }
        loadFamilyList();
        //adding some items to our list

        //creating recyclerView adapter
        FamilyAdapter adapter = new FamilyAdapter(this, familyList);

        //setting adapter to recyclerView
        recyclerView.setAdapter(adapter);

        addTextListener();

    }

public void addTextListener(){

        search.addTextChangedListener(new TextWatcher() {

            public void afterTextChanged(Editable s) {}

            public void beforeTextChanged(CharSequence s, int start, int count, int after) {}

            public void onTextChanged(CharSequence query, int start, int before, int count) {

                query = query.toString().toLowerCase();

                final List<Family> filteredList = new ArrayList<>();

                for (int i = 0; i < familyList.size(); i++) {

                    final String text = familyList.get(i).toString().toLowerCase();
                    if (text.contains(query)) {

                        filteredList.add(familyList.get(i));
                    }
                }

                recyclerView.setLayoutManager(new LinearLayoutManager(FamilyActivity.this));
                FamilyAdapter fadapter = new FamilyAdapter(FamilyActivity.this,filteredList);
                recyclerView.setAdapter(fadapter);
                fadapter.notifyDataSetChanged();  // data set changed
            }
        });
    }

适配器中的代码:

public class FamilyAdapter extends RecyclerView.Adapter<FamilyAdapter.FamilyViewHolder> {

private Context context;
private List<Family> familyList;
private List<Family> familyListFull;

public FamilyAdapter(Context context, List<Family> familyList) {
    this.context = context;
    this.familyList = familyList;
    familyListFull=new ArrayList<>(familyList);
}

@NonNull
@Override
public FamilyViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int i) {
    LayoutInflater inflater = LayoutInflater.from(context);
    View view = inflater.inflate(R.layout.list_layout, null);
    return new FamilyViewHolder(view);

}

@Override
public void onBindViewHolder(FamilyViewHolder familyViewHolder, final int position) {
    Family family = familyList.get(position);
    familyViewHolder.textViewTitle.setText(family.getName());
    familyViewHolder.familyLayout.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Log.d(TAG, "onClick: clicked on : " + familyList.get(position));
            String name = familyList.get(position).getName();
            String num = familyList.get(position).getNum();
            Intent intent = new Intent(context, Chatting.class);
            intent.putExtra("num", num);
            intent.putExtra("name", name);
            context.startActivity(intent);


        }
    });
    familyViewHolder.deleteButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            final AlertDialog.Builder builder = new AlertDialog.Builder(context );
            builder.setTitle("Delete");
            builder.setMessage("Are you sure you want to delete this one ")
                    .setPositiveButton("YES", new DialogInterface.OnClickListener() {
                        @Override
                        public void onClick(DialogInterface dialog, int which) {
                            RemoveFamilyMember(position);
                        }
                    }).setNegativeButton("NO", new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int which) {
                    builder.setCancelable(true);
                }
            });
            AlertDialog alert=builder.create();
            alert.show();


        }
    });


}

Answer 1

你可以试试这样的东西我认为这可能有用，我还没有测试过但我认为每次编辑文本中有东西时都制作一个新的适配器是一个坏主意。如果你回到查询等于“”空字符串的位置，那么你应该将 fileterd 列表放回我没有放在那里的整个列表中

public class FamilyActivity extends AppCompatActivity {
    RecyclerView recyclerView;
    FamilyAdapter familyAdapter;
    Button add_family;
    EditText search;

    List<Family> familyList;
    List<Family> filteredList;
    String patientID = "";
    FamilyAdapter adapter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_family);
        add_family=(Button)findViewById(R.id.add);
        search =(EditText)findViewById(R.id.search);

        familyList = new ArrayList<>();
        recyclerView = (RecyclerView) findViewById(R.id.recyclerView);
        recyclerView.setHasFixedSize(true);
        recyclerView.setLayoutManager(new LinearLayoutManager(this));
        Bundle extras = getIntent().getExtras();
        if (extras != null) {
            patientID = extras.getString("ID");
        }
        loadFamilyList();
        filteredList = new ArrayList<>(familyList);
        //adding some items to our list

        //creating recyclerView adapter
        adapter = new FamilyAdapter(this, filteredList);

        //setting adapter to recyclerView
        recyclerView.setAdapter(adapter);

        addTextListener();

    }

public void addTextListener(){

        search.addTextChangedListener(new TextWatcher() {

            public void afterTextChanged(Editable s) {}

            public void beforeTextChanged(CharSequence s, int start, int count, int after) {}

            public void onTextChanged(CharSequence query, int start, int before, int count) {

                query = query.toString().toLowerCase();

                filteredList = new ArrayList<>();

                for (int i = 0; i < familyList.size(); i++) {

                    final String text = familyList.get(i).toString().toLowerCase();
                    if (text.contains(query)) {

                        filteredList.add(familyList.get(i));
                    }
                }
                                    recyclerView.removeAllViews();;
                                    adapter.notifyDataSetChanged();  // data set changed
            }
        });
    }