Android中监听软键盘输入的使用方式

EditText editText = findViewById(R.id.editText);
editText.addTextChangedListener(new TextWatcher() {
    @Override
    public void beforeTextChanged(CharSequence charSequence, int start, int count, int after) {
        // 在文本改变之前执行的操作
    }
    @Override
    public void onTextChanged(CharSequence charSequence, int start, int before, int count) {
        // 在文本改变时执行的操作
    }
    @Override
    public void afterTextChanged(Editable editable) {
        // 在文本改变后执行的操作
    }
});

editText.addTextChangedListener(new TextWatcher() {
    @Override
    public void beforeTextChanged(CharSequence charSequence, int start, int count, int after) {
        // 在文本改变之前执行的操作
    }
    @Override
    public void onTextChanged(CharSequence charSequence, int start, int before, int count) {
        // 在文本改变时执行的操作
        String input = charSequence.toString();
        if (!isValidEmail(input)) {
            editText.setError("Invalid email");
        } else {
            editText.setError(null);
        }
    }
    @Override
    public void afterTextChanged(Editable editable) {
        // 在文本改变后执行的操作
    }
});

editText.addTextChangedListener(new TextWatcher() {
    @Override
    public void beforeTextChanged(CharSequence charSequence, int start, int count, int after) {
        // 在文本改变之前执行的操作
    }
    @Override
    public void onTextChanged(CharSequence charSequence, int start, int before, int count) {
        // 在文本改变时执行的操作
        String input = charSequence.toString();
        if (!input.matches("[0-9]+")) {
            editText.setError("Only numbers allowed");
        } else {
            editText.setError(null);
        }
    }
    @Override
    public void afterTextChanged(Editable editable) {
        // 在文本改变后执行的操作
    }
});

public class MyInputConnection extends InputConnectionWrapper {
    public MyInputConnection(InputConnection target, boolean mutable) {
        super(target, mutable);
    }
    @Override
    public boolean commitText(CharSequence text, int newCursorPosition) {
        // 在此处记录用户的文本输入
        Log.d("SoftKeyboard", "用户输入了: " + text);
        return super.commitText(text, newCursorPosition);
    }
}

import android.view.inputmethod.EditorInfo;
import android.view.inputmethod.InputConnection;
import android.widget.EditText;
public class CustomEditText extends EditText {
    public CustomEditText(Context context) {
        super(context);
    }
    @Override
    public InputConnection onCreateInputConnection(EditorInfo outAttrs) {
        InputConnection inputConnection = super.onCreateInputConnection(outAttrs);
        if (inputConnection != null) {
            // 使用自定义的InputConnectionWrapper
            inputConnection = new MyInputConnection(inputConnection, true);
        }
        return inputConnection;
    }
}