Question

我正在调用db helper的方法，同时用户按下done / next / enter，按钮但该代码执行两次，数据在表中输入两次。

以下是编辑文字的主要新闻事件：

editTextLitre.setOnKeyListener(new OnKeyListener() {

                @Override
                public boolean onKey(View v, int keyCode, KeyEvent event) {
                    // TODO Auto-generated method stub
                    switch(keyCode){
                    case KeyEvent.KEYCODE_ENTER:
                        TextView txtlitres = (TextView)findViewById(R.id.edit_text_litre);
                        TextView totalamount = (TextView)findViewById(R.id.amount);

                        RadioButton rbBuffalo = (RadioButton) findViewById(R.id.radioBuffalo);

                        RadioButton rbCow = (RadioButton) findViewById(R.id.radioCow);
                        rbBuffalo.setText(Constants.Buffalo.toString());
                        rbCow.setText(Constants.Cow.toString());
                        radioanimal= (RadioGroup)findViewById(R.id.radioCategory);
                        int selectedid = radioanimal.getCheckedRadioButtonId();

                        rb = (RadioButton)findViewById(selectedid);


                        DBHelper dh=new DBHelper(getApplicationContext());
                        // TODO Auto-generated method stub
                        boolean save = dh.insertMilkDetails(mandali,rb.getText().toString(),totalamount.getText().toString(),txtlitres.getText().toString(),dt.toString(),session.toString());

                        if(save == true)
                        {
                             Toast.makeText(getApplicationContext(), "Details Saved Successfully", Toast.LENGTH_SHORT).show();

                        }

                    return false;
                }
            });

我无法理解为什么数据在数据库表中插入两次。

Answer 1

非常简单，在按键期间为每个动作生成关键事件（即按键和按键）。您的代码会检查密钥代码类型，但不会验证该事件是ACTION_DOWN还是ACTION_UP。

传入的KeyEvent对象为您提供此信息（see docs）;你可能只想在up动作上插入。

使用EditText后，另一个可能更好的选项是OnEditorActionListener（docs），并不要求您检查此类内容。

Answer 2

将您的代码更改为：

    editTextLitre.setOnKeyListener(new OnKeyListener() {

        @Override
        public boolean onKey(View v, int keyCode, KeyEvent event) {
            // TODO Auto-generated method stub
            if (event.getAction() == KeyEvent.ACTION_DOWN) {
                switch (keyCode) {
                    case KeyEvent.KEYCODE_ENTER:
                        TextView txtlitres = (TextView) findViewById(R.id.edit_text_litre);
                        TextView totalamount = (TextView) findViewById(R.id.amount);

                        RadioButton rbBuffalo = (RadioButton) findViewById(R.id.radioBuffalo);

                        RadioButton rbCow = (RadioButton) findViewById(R.id.radioCow);
                        rbBuffalo.setText(Constants.Buffalo.toString());
                        rbCow.setText(Constants.Cow.toString());
                        radioanimal = (RadioGroup) findViewById(R.id.radioCategory);
                        int selectedid = radioanimal.getCheckedRadioButtonId();

                        rb = (RadioButton) findViewById(selectedid);


                        DBHelper dh = new DBHelper(getApplicationContext());
                        // TODO Auto-generated method stub
                        boolean save = dh.insertMilkDetails(mandali, rb.getText().toString(), totalamount.getText().toString(), txtlitres.getText().toString(), dt.toString(), session.toString());

                        if (save == true) {
                            Toast.makeText(getApplicationContext(), "Details Saved Successfully", Toast.LENGTH_SHORT).show();

                        }

                        return false;
                }
            }
        });

我改变了什么：if (event.getAction() == KeyEvent.ACTION_DOWN) { ...

因为当您按某个键时onKey事件发生两次：一次按下时，一次释放按键时。

数据在Android中的edittext的按键事件中插入两次

2 个答案: