Ví dụ này trình bày cách lọc RecyclerView bằng SearchView trên Android.
Bước 1 - Tạo một dự án mới trong Android Studio, đi tới Tệp ⇒ Dự án Mới và điền tất cả các chi tiết cần thiết để tạo một dự án mới.
Bước 2 - Thêm mã sau vào res / layout / activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
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=".MainActivity">
<android.support.v7.widget.RecyclerView
android:id="@+id/recyclerView"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:padding="4dp"
android:scrollbars="vertical"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>
Bước 3 - Thêm mã sau vào src / MainActivity.java
public class MainActivity extends AppCompatActivity {
private ExampleAdapter adapter;
private List<ExampleItem> exampleList;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
fillExampleList();
setUpRecyclerView();
}
private void fillExampleList() {
exampleList = new ArrayList<>();
exampleList.add(new ExampleItem(R.drawable.ic_android, "One", "Ten"));
exampleList.add(new ExampleItem(R.drawable.ic_audio, "Two", "Eleven"));
exampleList.add(new ExampleItem(R.drawable.ic_sun, "Three", "Twelve"));
exampleList.add(new ExampleItem(R.drawable.ic_android, "Four", "Thirteen"));
exampleList.add(new ExampleItem(R.drawable.ic_audio, "Five", "Fourteen"));
exampleList.add(new ExampleItem(R.drawable.ic_sun, "Six", "Fifteen"));
exampleList.add(new ExampleItem(R.drawable.ic_android, "Seven", "Sixteen"));
exampleList.add(new ExampleItem(R.drawable.ic_audio, "Eight", "Seventeen"));
exampleList.add(new ExampleItem(R.drawable.ic_sun, "Nine", "Eighteen"));
}
private void setUpRecyclerView() {
RecyclerView recyclerView = findViewById(R.id.recycler_view);
recyclerView.setHasFixedSize(true);
RecyclerView.LayoutManager layoutManager = new LinearLayoutManager(this);
adapter = new ExampleAdapter(exampleList);
recyclerView.setLayoutManager(layoutManager);
recyclerView.setAdapter(adapter);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.example_menu, menu);
MenuItem searchItem = menu.findItem(R.id.action_search);
SearchView searchView = (SearchView) searchItem.getActionView();
searchView.setImeOptions(EditorInfo.IME_ACTION_DONE);
searchView.setOnQueryTextListener(new SearchView.OnQueryTextListener() {
@Override
public boolean onQueryTextSubmit(String query) {
return false;
}
@Override
public boolean onQueryTextChange(String newText) {
adapter.getFilter().filter(newText);
return false;
}
});
return true;
}
}
Bước 4 - Thêm mã sau vào src / ExampleItem.java
public class ExampleItem {
private int imageResource;
private String text1;
private String text2;
public ExampleItem(int imageResource, String text1, String text2) {
this.imageResource = imageResource;
this.text1 = text1;
this.text2 = text2;
}
public int getImageResource() {
return imageResource;
}
public String getText1() {
return text1;
}
public String getText2() {
return text2;
}
}
Bước 5 - Thêm mã sau vào src / ExampleAdapter.java
public class ExampleAdapter extends
RecyclerView.Adapter<ExampleAdapter.ExampleViewHolder> implements Filterable {
private List<ExampleItem> exampleList;
private List<ExampleItem> exampleListFull;
class ExampleViewHolder extends RecyclerView.ViewHolder {
ImageView imageView;
TextView textView1;
TextView textView2;
ExampleViewHolder(View itemView) {
super(itemView);
imageView = itemView.findViewById(R.id.image_view);
textView1 = itemView.findViewById(R.id.text_view1);
textView2 = itemView.findViewById(R.id.text_view2);
}
}
ExampleAdapter(List<ExampleItem> exampleList) {
this.exampleList = exampleList;
exampleListFull = new ArrayList<>(exampleList);
}
@NonNull
@Override
public ExampleViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.example_item, parent, false);
return new ExampleViewHolder(v);
}
@Override
public void onBindViewHolder(@NonNull ExampleViewHolder holder, int position) {
ExampleItem currentItem = exampleList.get(position);
holder.imageView.setImageResource(currentItem.getImageResource());
holder.textView1.setText(currentItem.getText1());
holder.textView2.setText(currentItem.getText2());
}
@Override
public int getItemCount() {
return exampleList.size();
}
@Override
public Filter getFilter() {
return exampleFilter;
}
private Filter exampleFilter = new Filter() {
@Override
protected FilterResults performFiltering(CharSequence constraint) {
List<ExampleItem> filteredList = new ArrayList<>();
if (constraint == null || constraint.length() == 0) {
filteredList.addAll(exampleListFull);
} else {
String filterPattern = constraint.toString().toLowerCase().trim();
for (ExampleItem item : exampleListFull) {
if (item.getText2().toLowerCase().contains(filterPattern)) {
filteredList.add(item);
}
}
}
FilterResults results = new FilterResults();
results.values = filteredList;
return results;
}
@Override
protected void publishResults(CharSequence constraint, FilterResults results) {
exampleList.clear();
exampleList.addAll((List) results.values);
notifyDataSetChanged();
}
};
}
Bước 6 - Thêm mã sau vào res/layout /example_item.xml
<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.CardView
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginBottom="4dp"
app:cardCornerRadius="4dp">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_margin="4dp">
<ImageView
android:id="@+id/image_view"
android:layout_width="50dp"
android:layout_height="50dp"
android:padding="2dp" />
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_toEndOf="@+id/image_view"
android:text="Line 1"
android:textColor="@android:color/black"
android:textSize="20sp"
android:textStyle="bold" />
<TextView
android:id="@+id/textView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/text_view1"
android:layout_marginStart="8dp"
android:layout_toEndOf="@+id/image_view"
android:text="Line 2"
android:textSize="15sp" />
</RelativeLayout>
</android.support.v7.widget.CardView>
Bước 7 - Thêm mã sau vào res/menu/example_menu.xml
<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<item
android:id="@+id/actionSearch"
android:title="Search"
app:showAsAction="ifRoom|collapseActionView" />
</menu>
Bước 8 - Thêm mã sau vào Manifest / AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.app.sample">
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
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| How to filter a RecyclerView with a SearchView on Android |
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