android - 如何检查或验证 Enter 键

Question

如何在android中检查编辑文本的回车键。

Answer 1

您必须在 Activity 中实现 OnKeyListener 并覆盖其 onKey() 方法：

    @Override
    public boolean onKey(View view, int keyCode, KeyEvent event) {
    flag = false;

    if (keyCode == KeyEvent.KEYCODE_ENTER) {
        if (event.getAction() != KeyEvent.ACTION_DOWN) {
                         flag = false;
        } else if (event.getAction() != KeyEvent.ACTION_UP) {
                         // do your work on Enter key pressed.
                         flag = true;
        }
    }

    return flag;
    }

Answer 2

final EditText edittext = (EditText) findViewById(R.id.edittext);
edittext.setOnKeyListener(new OnKeyListener() {
    public boolean onKey(View v, int keyCode, KeyEvent event) {
        // If the event is a key-down event on the "enter" button
        if ((event.getAction() == KeyEvent.ACTION_DOWN) &&
            (keyCode == KeyEvent.KEYCODE_ENTER)) {
          // Perform action on key press
          Toast.makeText(HelloFormStuff.this, edittext.getText(), Toast.LENGTH_SHORT).show();
          return true;
        }
        return false;
    }
});

试试这个

Answer 3

用于onKeyListener检查 Enter 按下

例如。

edittext.setOnKeyListener(new OnKeyListener() {
        @Override
        public boolean onKey(View v, int keyCode, KeyEvent event) {
            if (event.getAction()!=KeyEvent.ACTION_DOWN)
                return false;
            if(keyCode == KeyEvent.KEYCODE_ENTER ){
                            //your necessary codes...
                return true;
            }
            return false;
        }
    };

更多信息，查看官方文档

Answer 4

我想您有一个保存按钮，并且您想在单击它时进行验证？

saveButton.setOnClickListener(new OnClickListener(){
    public void onClick(View v) {
        String textInput = myEditText.getText().toString();
        // do your validation here
    }
});