如何在Android中为EditText设置最小和最大字符限制？

Question

我想为EditText框设置最小和最大输入值.我正在为EditText创建一个简单的验证; 它采用AZ和0-9值,最小值为5,最大值为8.

我设置了最大值和其他验证如下:

 <EditText 
        android:id="@+id/edittextKode_Listing"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginRight="5dp"
        android:layout_marginLeft="5dp"
        android:layout_alignTop="@+id/textKode_listing"
        android:layout_toRightOf="@+id/textKode_listing"
        android:maxLength="8"
        android:inputType="textCapCharacters"
        android:digits="0,1,2,3,4,5,6,7,8,9,ABCDEFGHIJKLMNOPQRSTVUWXYZ"
        />

但无法设定最低价值要求.我的EditText框位于警告对话框中.我尝试了以下代码来解决问题:

private void openInboxDialog() {

        LayoutInflater inflater = this.getLayoutInflater();
        // declare dialog view
        final View dialogView = inflater.inflate(R.layout.kirim_layout, null);

        final EditText edittextKode = (EditText) dialogView.findViewById(R.id.edittextKode_Listing);
        final EditText edittextalamat = (EditText) dialogView.findViewById(R.id.edittextAlamat);
        edittextKode.setOnFocusChangeListener(new OnFocusChangeListener() {

            @Override
            public void onFocusChange(View v, boolean hasFocus) {
                // TODO Auto-generated method stub

                if(edittextKode.getText().toString().length() > 0){
                    if(edittextKode.getText().toString().length() < 5)
                    {
                        edittextKode.setError("Error");
                        Toast.makeText(GPSActivity.this, "Kode listing value not be less than 5", Toast.LENGTH_SHORT).show();
                        edittextKode.requestFocus();

                    }
                }
            }
        });
        final AlertDialog.Builder builder = new AlertDialog.Builder(GPSActivity.this);
        builder.setTitle("Kirim").setView(dialogView)
                .setNeutralButton("OK", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        // TODO Auto-generated method stub
                        gpsCoordinates = (TextView) findViewById(R.id.text_GPS_Coordinates);
                        kode = edittextKode.getText().toString();
                        alamat = edittextalamat.getText().toString();
                        catatan = edittextcatatan.getText().toString();
                        pengirim = edittextPengirim.getText().toString();
                        if (kode.length() > 0 && alamat.length() > 0
                                && catatan.length() > 0 && pengirim.length() > 0) {
                            message = "Kode listing : " + kode + "\nAlamat : "
                                    + alamat + " \nCatatan : " + catatan + " \n Pengirim : " + pengirim
                                    + "\nKoordinat GPS : "
                                    + gpsCoordinates.getText().toString();
                                sendByGmail();
                        } else {
                            Toast.makeText(
                                    getApplicationContext(),
                                    "Please fill all three fields to send mail",
                                    Toast.LENGTH_LONG).show();
                        }
                    }
                });
        builder.create();
        builder.show();
    }`

在此警报对话框中,我有两个EditText框.我想在第一个EditText上应用我的验证.我调用了setOnFocusChangeListener来检查焦点变化时的最小长度.如果长度小于5然后请求焦点,但它仍然在第二个EditText框中键入.

有谁可以帮助我.

Answer 1

没有直接的方法可以做到这一点，据我所知，唯一的方法是当编辑文本失去焦点或用户提交信息时进行长度检查并查看其是否少于 5 个字符，例如

if (myTextBox.length() < 5)
{
Log.d("APP", "Sorry, you need to enter at least 5 characters";
}
else
{
Log.d("APP", "Input valid");
}