用于从字典打字的android键盘事件

<!-- res/layout/custom_keyboard.xml -->
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical">

    <!-- 添加你的按键布局 -->
    <Button
        android:id="@+id/button_a"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="A" />

    <!-- ... 其他按键 ... -->

</LinearLayout>

public class CustomKeyboardView extends LinearLayout {

    public CustomKeyboardView(Context context) {
        super(context);
        init(context);
    }

    public CustomKeyboardView(Context context, AttributeSet attrs) {
        super(context, attrs);
        init(context);
    }

    private void init(Context context) {
        LayoutInflater.from(context).inflate(R.layout.custom_keyboard, this, true);
        setupListeners();
    }

    private void setupListeners() {
        Button buttonA = findViewById(R.id.button_a);
        buttonA.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                onKeyClick('A');
            }
        });

        // ... 设置其他按键的监听器 ...
    }

    public void onKeyClick(char key) {
        // 处理按键事件，例如将字符添加到输入框
        InputConnection ic = getCurrentInputConnection();
        if (ic != null) {
            ic.commitText(String.valueOf(key), 1);
        }
    }

    private InputConnection getCurrentInputConnection() {
        // 获取当前焦点视图和输入连接
        View view = KeyboardView.this.getRootView().getWindowToken() != null ? KeyboardView.this : KeyboardView.this.findViewById(android.R.id.content);
        InputMethodManager imm = (InputMethodManager) KeyboardView.this.getContext().getSystemService(Context.INPUT_METHOD_SERVICE);
        return imm.getFocusedView().onCreateInputConnection(new EditorInfo());
    }
}

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        CustomKeyboardView customKeyboard = new CustomKeyboardView(this);
        LinearLayout mainLayout = findViewById(R.id.main_layout);
        mainLayout.addView(customKeyboard);

        // 设置输入框的焦点监听器，以便在获得焦点时显示自定义键盘
        EditText editText = findViewById(R.id.edit_text);
        editText.setOnFocusChangeListener(new View.OnFocusChangeListener() {
            @Override
            public void onFocusChange(View v, boolean hasFocus) {
                if (hasFocus) {
                    customKeyboard.setVisibility(View.VISIBLE);
                } else {
                    customKeyboard.setVisibility(View.GONE);
                }
            }
        });
    }
}

// 在CustomKeyboardView类中添加字典逻辑
private Map<String, String> dictionary = new HashMap<>();

public CustomKeyboardView(Context context) {
    super(context);
    init(context);
    loadDictionary();
}

private void loadDictionary() {
    // 加载字典数据
    dictionary.put("A", "Apple");
    dictionary.put("B", "Banana");
    // ... 添加更多单词 ...
}

public void onKeyClick(char key) {
    // 处理按键事件，例如将字符添加到输入框
    InputConnection ic = getCurrentInputConnection();
    if (ic != null) {
        ic.commitText(String.valueOf(key), 1);
        suggestWords(String.valueOf(key));
    }
}

private void suggestWords(String prefix) {
    // 根据前缀提供建议
    for (Map.Entry<String, String> entry : dictionary.entrySet()) {
        if (entry.getKey().startsWith(prefix)) {
            // 显示建议单词
        }
    }
}