Android custom numeric keyboard

Question

I want to add numeric keyboard like the one in vault application

Answer 1

1. Use TableLayout to create the numeric keyboard layout.
2. Bind View.OnClickListener on each custom key view to response user input.
3. In responses, append or delete text to that password field which implements by EditText.You can use append() or setText() to control what will be filled in the password field.

I write a custom view for reusing in anywhere, here is the code:

KeyboardView.java

public class KeyboardView extends FrameLayout implements View.OnClickListener {

    private EditText mPasswordField;

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

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

    public KeyboardView(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        init();
    }

    private void init() {
        inflate(getContext(), R.layout.keyboard, this);
        initViews();
    }

    private void initViews() {
        mPasswordField = $(R.id.password_field);
        $(R.id.t9_key_0).setOnClickListener(this);
        $(R.id.t9_key_1).setOnClickListener(this);
        $(R.id.t9_key_2).setOnClickListener(this);
        $(R.id.t9_key_3).setOnClickListener(this);
        $(R.id.t9_key_4).setOnClickListener(this);
        $(R.id.t9_key_5).setOnClickListener(this);
        $(R.id.t9_key_6).setOnClickListener(this);
        $(R.id.t9_key_7).setOnClickListener(this);
        $(R.id.t9_key_8).setOnClickListener(this);
        $(R.id.t9_key_9).setOnClickListener(this);
        $(R.id.t9_key_clear).setOnClickListener(this);
        $(R.id.t9_key_backspace).setOnClickListener(this);
    }

    @Override
    public void onClick(View v) {
        // handle number button click
        if (v.getTag() != null && "number_button".equals(v.getTag())) {
            mPasswordField.append(((TextView) v).getText());
            return;
        }
        switch (v.getId()) {
            case R.id.t9_key_clear: { // handle clear button
                mPasswordField.setText(null);
            }
            break;
            case R.id.t9_key_backspace: { // handle backspace button
                // delete one character
                Editable editable = mPasswordField.getText();
                int charCount = editable.length();
                if (charCount > 0) {
                    editable.delete(charCount - 1, charCount);
                }
            }
            break;
        }
    }

    public String getInputText() {
        return mPasswordField.getText().toString();
    }

    protected  T $(@IdRes int id) {
        return (T) super.findViewById(id);
    }
}

layout keyboard.xml

style.xml

drawable keyboard_button_bg.xml

drawable keyboard_divider.xml

strings.xml

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Back

Use the custom KeyboardView in your layout :

---

Old answer:

The keyboard layout code looks like this:

Each key style:

Responses of each key:

private EditText mEtPassword ;

private void setViews(){
    // find view references...
    // set OnClickListener to each key view...
}

private void onT9KeyClicked(int key) {
    switch (key) {
    case R.id.anti_theft_t9_key_0:
        mEtPassword.append("0");
        break;
    case R.id.anti_theft_t9_key_1:
        mEtPassword.append("1");
        break;
    case R.id.anti_theft_t9_key_2:
        mEtPassword.append("2");
        break;
    case R.id.anti_theft_t9_key_3:
        mEtPassword.append("3");
        break;
    case R.id.anti_theft_t9_key_4:
        mEtPassword.append("4");
        break;
    case R.id.anti_theft_t9_key_5:
        mEtPassword.append("5");
        break;
    case R.id.anti_theft_t9_key_6:
        mEtPassword.append("6");
        break;
    case R.id.anti_theft_t9_key_7:
        mEtPassword.append("7");
        break;
    case R.id.anti_theft_t9_key_8:
        mEtPassword.append("8");
        break;
    case R.id.anti_theft_t9_key_9:
        mEtPassword.append("9");
        break;
    case R.id.anti_theft_t9_key_backspace: {
        // delete one character
        String passwordStr = mEtPassword.getText().toString();
        if (passwordStr.length() > 0) {
            String newPasswordStr = new StringBuilder(passwordStr)
                    .deleteCharAt(passwordStr.length() - 1).toString();
            mEtPassword.setText(newPasswordStr);
        }
    }
        break;
    case R.id.anti_theft_t9_key_clear:
        // clear password field
        mEtPassword.setText(null);
        break;
    }
}