Android TextField：以编程方式设置焦点+软输入

Java
Button showKeyboardButton = findViewById(R.id.showKeyboardButton);
Button hideKeyboardButton = findViewById(R.id.hideKeyboardButton);
final EditText editText = findViewById(R.id.editText);
showKeyboardButton.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        InputMethodManager imm = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
        imm.showSoftInput(editText, InputMethodManager.SHOW_IMPLICIT);
    }
});
hideKeyboardButton.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        InputMethodManager imm = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
        imm.hideSoftInputFromWindow(editText.getWindowToken(), 0);
    }
});