android.widget.EditText#focusSearch ( )源码实例Demo

@OnClick({ R.id.zero, R.id.one, R.id.two, R.id.three, R.id.four,
            R.id.five, R.id.six, R.id.seven, R.id.eight, R.id.nine })
    void onClick(TextView view) {
        if (mFocusGrabber.isFocused())
            return;
        EditText field = getFocusedField();
        int at = field.getSelectionStart();
        field.getText().replace(at, at + 1, view.getText());
        field.setSelection(at + 1);
//        updateStartButtonVisibility();
        if (field.getSelectionStart() == FIELD_LENGTH) {
            // At the end of the current field, so try to focus to the next field.
            // The search will return null if no view can be focused next.
            View next = field.focusSearch(View.FOCUS_RIGHT);
            if (next != null) {
                next.requestFocus();
                if (next instanceof EditText) {
                    // Should always start off at the beginning of the field
                    ((EditText) next).setSelection(0);
                }
            }
        }
    }
 

private void handleEnter() {
    View currentFocusView = getRootView().findFocus();
    if (currentFocusView == null) {
        return;
    }
    if (currentFocusView instanceof EditText) {
        EditText currentFocusEt = (EditText) currentFocusView;
        if (currentFocusEt.getImeActionId() > 0) {
            currentFocusEt.onEditorAction(currentFocusEt.getImeActionId());
        } else {
            View nextFocusView = currentFocusEt.focusSearch(View.FOCUS_DOWN);
            if (nextFocusView != null) {
                nextFocusView.requestFocus(View.FOCUS_DOWN);
                return;
            } else {
                if (imm.isActive(currentFocusEt)) {
                    imm.hideSoftInputFromWindow(currentFocusEt.getWindowToken(), 0);
                }
                hideKeyboard();
                return;
            }
        }
    }
}
 

@OnClick(R.id.backspace)
    void backspace() {
        if (mFocusGrabber.isFocused()) {
            mEditFieldsLayout.focusSearch(mFocusGrabber, View.FOCUS_LEFT).requestFocus();
        }
        EditText field = getFocusedField();
        if (field == null)
            return;
        int at = field.getSelectionStart();
        if (at == 0) {
            // At the beginning of current field, so move focus
            // to the preceding field
            View prev = field.focusSearch(View.FOCUS_LEFT);
            if (null == prev) {
                // Reached the beginning of the hours field
                return;
            }
            if (prev.requestFocus()) {
                if (prev instanceof EditText) {
                    // Always move the cursor to the end when moving focus back
                    ((EditText) prev).setSelection(FIELD_LENGTH);
                }
                // Recursively backspace on the newly focused field
                backspace();
            }
        } else {
            field.getText().replace(at - 1, at, "0");
            field.setSelection(at - 1);
//            updateStartButtonVisibility();
        }
    }
 

private void configureDoneButton() {
    View currentFocusView = getRootView().findFocus();
    if (currentFocusView == null) {
        return;
    }
    if (currentFocusView instanceof EditText) {
        EditText currentFocusEt = (EditText) currentFocusView;
        if (!Utils.isEmpty(currentFocusEt.getImeActionLabel() == null ? null :
                currentFocusEt.getImeActionLabel().toString())) {
            setEnterKeyText(currentFocusEt.getImeActionLabel());
        } else if (currentFocusEt.getImeActionId() > 0) {
            switch (currentFocusEt.getImeActionId()) {
                case EditorInfo.IME_ACTION_DONE:
                case EditorInfo.IME_ACTION_GO:
                case EditorInfo.IME_ACTION_SEND:
                    setEnterKeyText(getResources().getString(R.string.password_keyboard_done));
                    break;
                case EditorInfo.IME_ACTION_NEXT:
                    setEnterKeyText(getResources().getString(R.string.password_keyboard_next));
                    break;
                default:
                    break;
            }
        } else {
            View nextFocusView = currentFocusEt.focusSearch(View.FOCUS_DOWN);
            if (nextFocusView != null) {
                setEnterKeyText(getResources().getString(R.string.password_keyboard_next));
            } else {
                setEnterKeyText(getResources().getString(R.string.password_keyboard_done));
            }
        }
        EntryKeyboard keyboard = (EntryKeyboard) getKeyboard();
        invalidateKey(keyboard.getEnterKeyIndex());
    }
}