android - 使用按钮android studio在editText中移动光标

Question

我正在为 android studio 开发一个应用程序。我添加了左右移动光标的按钮，如何在行之间上下移动？这是我已经做过的：

编辑文本编辑文本；ImageButton buttonBackward, buttonForward; 相对布局箭头；

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

    editText = findViewById(R.id.editText);
    buttonBackward = findViewById(R.id.buttonBackward);
    buttonForward = findViewById(R.id.buttonForward);
    arrows = findViewById(R.id.arrows);
    editText.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            arrows.setVisibility(View.VISIBLE);
        }
    });
    buttonForward.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            if (editText.getSelectionEnd() < editText.getText().toString().length()) {
                editText.setSelection(editText.getSelectionEnd() + 1);
            } else {
                //fine stringa, non posso muovere il cursore
            }
        }
    });
    buttonBackward.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            if (editText.getSelectionStart() > 0) {
                editText.setSelection(editText.getSelectionEnd() - 1);
            } else {
                //start of string, cannot move cursor backward
            }
        }
    });
}

标签： androidandroid-studioandroid-edittextandroid-buttonandroid-cursor