Android 使用 Fragment 进行搜索

使用 Fragment 进行搜索

java
// MainActivity.java
public class MainActivity extends AppCompatActivity {
    private EditText searchEditText;
    private Button searchButton;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        searchEditText = findViewById(R.id.search_edit_text);
        searchButton = findViewById(R.id.search_button);
        searchButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                String keyword = searchEditText.getText().toString();
                SearchResultFragment fragment = SearchResultFragment.newInstance(keyword);
                getSupportFragmentManager().beginTransaction()
                        .replace(R.id.fragment_container, fragment)
                        .commit();
            }
        });
    }
}

java
// SearchResultFragment.java
public class SearchResultFragment extends Fragment {
    private static final String ARG_KEYWORD = "keyword";
    private TextView resultTextView;
    private String keyword;
    public SearchResultFragment() {
        // Required empty public constructor
    }
    public static SearchResultFragment newInstance(String keyword) {
        SearchResultFragment fragment = new SearchResultFragment();
        Bundle args = new Bundle();
        args.putString(ARG_KEYWORD, keyword);
        fragment.setArguments(args);
        return fragment;
    }
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        if (getArguments() != null) {
            keyword = getArguments().getString(ARG_KEYWORD);
        }
    }
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_search_result, container, false);
        resultTextView = view.findViewById(R.id.result_text_view);
        // 执行搜索操作，并将结果显示在 resultTextView 中
        return view;
    }
}

xml
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingLeft="16dp"
    android:paddingTop="16dp"
    android:paddingRight="16dp"
    android:paddingBottom="16dp"
    tools:context=".MainActivity">
            android:id="@+id/search_edit_text"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="请输入搜索关键字"/>
            android:id="@+id/search_button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@id/search_edit_text"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="16dp"
        android:text="搜索"/>
            android:id="@+id/fragment_container"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_below="@id/search_button"/>

xml
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">
            android:id="@+id/result_text_view"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:padding="16dp"
        android:text="搜索结果将显示在这里"/>