我正在处理Android应用并处理来自edittext字段的用户输入。我想检查用户是否输入了正确的日期格式;但是，由于我不理解的原因，我需要将edittext类型日期的类型转换为字符串，然后将其转换回浮点数，以检查正则表达式并且无法正常工作。
editactivity.xml：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:weightSum="1">
<EditText
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:id="@+id/et_normal_text"
android:hint="Enter the title of your selfie"
android:inputType="text"
android:textStyle="bold"/>
<EditText
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:id="@+id/et_name"
android:hint="Enter the title of your selfie"
android:inputType="text"
android:textStyle="bold"/>
<EditText
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:id="@+id/name"
android:hint="Enter the title of your selfie"
android:inputType="text"
android:textStyle="bold"/>
<EditText
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:id="@+id/et_location"
android:hint="Enter the title of your selfie"
android:inputType="text"
android:textStyle="bold"/>
<EditText
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:id="@+id/et_email_address"
android:textStyle="bold"
android:inputType="textEmailAddress"
android:hint="Enter Email Address"/>
<EditText
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:id="@+id/ed_date"
android:hint="Enter Date"
android:inputType="date"
android:textStyle="bold"/>
<EditText
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:id="@+id/location"
android:hint="Enter Location"
android:inputType="textAutoComplete"
android:textStyle="bold"/>
<Button
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="Submit"
android:id="@+id/btn_submit" />
<ImageView
android:id="@+id/imageView1"
android:layout_width="match_parent"
android:layout_height="106dp"
android:padding="1dp"
android:layout_weight="0.98"></ImageView>
<Button
android:id="@+id/btnCapture"
android:layout_width="135dp"
android:layout_height="wrap_content"
android:text="Take picture" />
<Button
android:id="@+id/save"
android:layout_width="135dp"
android:layout_height="wrap_content"
android:text="Save" />
<Button
android:id="@+id/cancel"
android:layout_width="135dp"
android:layout_height="wrap_content"
android:onClick="onClick"
android:text="Cancel" />
<Button
android:id="@+id/image"
android:layout_width="135dp"
android:layout_height="wrap_content"
android:text="See Image" />
</LinearLayout>
EditActivity：
package gmbh.packagename.myselfieme;
import android.app.Activity;
import android.content.ContentValues;
import android.content.Intent;
import android.database.sqlite.SQLiteDatabase;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Matrix;
import android.graphics.Paint;
import android.graphics.Rect;
import android.icu.util.Calendar;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.text.Editable;
import android.text.InputType;
import android.text.TextWatcher;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.Toast;
import com.google.android.gms.maps.model.BitmapDescriptorFactory;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.MarkerOptions;
import static gmbh.packagename.myselfieme.R.drawable.marker;
import static gmbh.packagename.myselfieme.R.id.date;
import static gmbh.packagename.myselfieme.R.id.time;
import static gmbh.packagename.myselfieme.R.string.snippet;
public class EditActivity extends Activity {
public static int count = 0;
static final int REQUEST_TAKE_PHOTO = 1;
private static final String KEY_MARKER_ID = "id";
private static final String KEY_MARKER_TITLE = "title";
private static final String KEY_MARKER_DATE = "date";
private static final String KEY_MARKER_LOC = "location";
private static final String KEY_MARKER_LAT = "latlng";
private static final String KEY_MARKER_NAME = "name";
private static final String KEY_MARKER_PIC = "picture";
private static final int CAMERA_REQUEST = 1888;
private EditText etNormalText;
private EditText etName;
private EditText etLocation;
private EditText etEmailAddrss;
private EditText etDate;
private Button btnSubmit;
private ImageView imageView;
Bitmap photo;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.editactivity);
PostsDatabaseHelper helper = PostsDatabaseHelper.getInstance(this);
helper.getReadableDatabase();
registerViews();
this.imageView = (ImageView) this.findViewById(R.id.imageView1);
Button photoButton = (Button) this.findViewById(R.id.btnCapture);
photoButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent cameraIntent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
startActivityForResult(cameraIntent, CAMERA_REQUEST);
}
});
}
private void registerViews() {
etNormalText = (EditText) findViewById(R.id.et_normal_text);
etName = (EditText) findViewById(R.id.et_name);
etLocation = (EditText) findViewById(R.id.et_location);
// TextWatcher would let us check validation error on the fly
etNormalText.addTextChangedListener(new TextWatcher() {
public void afterTextChanged(Editable s) {
Validation.hasText(etNormalText);
}
public void beforeTextChanged(CharSequence s, int start, int count, int after){}
public void onTextChanged(CharSequence s, int start, int before, int count){}
});
etName.addTextChangedListener(new TextWatcher() {
public void afterTextChanged(Editable s) {
Validation.hasText(etName);
}
public void beforeTextChanged(CharSequence s, int start, int count, int after){}
public void onTextChanged(CharSequence s, int start, int before, int count){}
});
etLocation.addTextChangedListener(new TextWatcher() {
public void afterTextChanged(Editable s) {
Validation.hasText(etLocation);
}
public void beforeTextChanged(CharSequence s, int start, int count, int after){}
public void onTextChanged(CharSequence s, int start, int before, int count){}
});
etEmailAddrss = (EditText) findViewById(R.id.et_email_address);
etEmailAddrss.addTextChangedListener(new TextWatcher() {
// after every change has been made to this editText, we would like to check validity
public void afterTextChanged(Editable s) {
Validation.isEmailAddress(etEmailAddrss, true);
}
public void beforeTextChanged(CharSequence s, int start, int count, int after){}
public void onTextChanged(CharSequence s, int start, int before, int count){}
});
etDate = (EditText) findViewById(R.id.ed_date);
etDate.addTextChangedListener(new TextWatcher() {
public void afterTextChanged(Editable s) {
Validation.isDate(etDate, false);
}
public void beforeTextChanged(CharSequence s, int start, int count, int after){}
public void onTextChanged(CharSequence s, int start, int before, int count){}
});
btnSubmit = (Button) findViewById(R.id.btn_submit);
btnSubmit.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Log.w("EditActivity", "clicking on btn_submit");
/*
Validation class will check the error and display the error on respective fields
but it won't resist the form submission, so we need to check again before submit
*/
if ( checkValidation () )
submitForm();
else
Toast.makeText(EditActivity.this, "Form contains error", Toast.LENGTH_LONG).show();
}
});
final LatLng latlng = getIntent().getParcelableExtra("location");
final EditText title = (EditText) findViewById(R.id.title);
final EditText date = (EditText) findViewById(R.id.ed_date);
final EditText location = (EditText) findViewById(R.id.location);
final EditText name = (EditText) findViewById(R.id.name);
Button button = (Button) findViewById(R.id.save);
Button cancelbutton = (Button) findViewById(R.id.cancel);
Button imagebutton = (Button) findViewById(R.id.image);
imagebutton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Intent myIntent = new Intent(EditActivity.this, ImageActivity.class);
myIntent.putExtra("marker", marker);
myIntent.putExtra("BitmapImage", photo);
EditActivity.this.startActivity(myIntent);
setResult(Activity.RESULT_OK, myIntent);
}
});
date.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if(date.getText().length()<1){
// Display toast
Toast.makeText(getApplicationContext(), "Please enter something !",Toast.LENGTH_LONG).show();
}
}
});
date.addTextChangedListener(new TextWatcher(){
@Override
public void beforeTextChanged(CharSequence s, int start, int count,
int after) {
if(date.getText().length()<1){
// Display toast
Toast.makeText(getApplicationContext(), "Please enter something !",Toast.LENGTH_LONG).show();
}
}
@Override
public void onTextChanged(CharSequence s, int start, int before,
int count) {
}
@Override
public void afterTextChanged(Editable s) {
// TODO Auto-generated method stub
//String ss = date.getText().toString();
int o = 0;
//String regEx ="^(0[1-9]|1[012])[- /.](0[1-9]|[12][0-9]|3[01])[- /.](19|20)\\d{2}$";
/*
if ((ss.charAt(2) == '/') && (ss.charAt(4) == '/')) {
}*/
int ss = date.getInputType();
if (ss == (InputType.TYPE_CLASS_DATETIME | InputType.TYPE_DATETIME_VARIATION_DATE))
{
int dateInput = Integer.parseInt(date.getText().toString());
//(0?[1-9]|[12][0-9]|3[01])/(0?[1-9]|1[012])/((19|20)\\d\\d)
Toast.makeText(EditActivity.this, "Format Is right", Toast.LENGTH_LONG).show();
}
/* if (ss.matches("\\d{4}-\\d{2}-\\d{2}")) {
Toast.makeText(EditActivity.this, "Format Is right", Toast.LENGTH_LONG).show();
}*/
/*if(date.getText().length()<4){
// Display toast
Toast.makeText(getApplicationContext(), "Please enter something !",Toast.LENGTH_LONG).show();
}*/
else {
date.setTextColor(Color.RED);
date.setText("Invalid Format");
}
//ss = "";
}
});
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(final View view) {
Bitmap resized = Bitmap.createScaledBitmap(photo, (int) (photo.getWidth() * 0.5), (int) (photo.getHeight() * 0.5), true);
//Bitmap.Config conf = Bitmap.Config.ARGB_8888;
//Bitmap bmp = Bitmap.createBitmap(150, 150, conf);
Canvas canvas1 = new Canvas();
Rect rectangle = new Rect(0,0,100,100);
canvas1.drawBitmap(resized, new Rect(0,0,100,100), rectangle, null);
resized = addBorderToBitmap(resized, 10, Color.WHITE);
// Add a border around the bitmap as shadow
resized = addBorderToBitmap(resized, 3, Color.LTGRAY);
MarkerOptions marker = new MarkerOptions().position(latlng)
.icon(BitmapDescriptorFactory.fromBitmap(resized))
.draggable(true);
if (title.getText() != null) {
marker.title(title.getText().toString());
}
if( date.getText().toString().length() == 0 )
date.setError( "date is required!" );
marker.snippet(date.getText().toString());
if (name.getText() !=null) {
marker.snippet(name.getText().toString());
}
if (location.getText() !=null) {
marker.snippet(location.getText().toString());
}
Intent resultIntent = new Intent();
resultIntent.putExtra("marker", marker);
resultIntent.putExtra("BitmapImage", photo); // passing the bitmap to the next activity . and retrieve it to the next activity
setResult(Activity.RESULT_OK, resultIntent);
finish();
}
});}
public static Bitmap overlay(Bitmap bmp, Bitmap resized) {
Bitmap bmOverlay = Bitmap.createBitmap(bmp.getWidth(), bmp.getHeight(), bmp.getConfig());
Canvas canvas = new Canvas(bmOverlay);
canvas.drawBitmap(bmp, new Matrix(), null);
canvas.drawBitmap(resized, 0, 0, null);
return bmOverlay;
}
private void submitForm() {
// Submit your form here. your form is valid
Toast.makeText(this, "Submitting form...", Toast.LENGTH_LONG).show();
Log.w("EditActivity", "submitForm");
}
private boolean checkValidation() {
Log.w("EditActivity", "checkValidation");
boolean ret = true;
if (!Validation.hasText(etNormalText)) ret = false;
if (!Validation.isEmailAddress(etEmailAddrss, true)) ret = false;
if (!Validation.isDate(etDate, false)) ret = false;
return ret;
}
public void onClick(View v) {
// TODO:
// Launch Activity Two
// Hint: use Context's startActivity() method
// Create an intent stating which Activity you would like to start
Intent myIntent = new Intent(EditActivity.this, MapsActivity.class);
// Launch the Activity using the intent
EditActivity.this.startActivity(myIntent);
}
protected Bitmap addBorderToBitmap(Bitmap resized, int borderWidth, int borderColor) {
// Initialize a new Bitmap to make it bordered bitmap
Bitmap dstBitmap = Bitmap.createBitmap(
resized.getWidth() + borderWidth * 2, // Width
resized.getHeight() + borderWidth * 2, // Height
Bitmap.Config.ARGB_8888 // Config
);
/*
Canvas
The Canvas class holds the "draw" calls. To draw something, you need 4 basic
components: A Bitmap to hold the pixels, a Canvas to host the draw calls (writing
into the bitmap), a drawing primitive (e.g. Rect, Path, text, Bitmap), and a paint
(to describe the colors and styles for the drawing).
*/
// Initialize a new Canvas instance
Canvas canvas = new Canvas(dstBitmap);
// Initialize a new Paint instance to draw border
Paint paint = new Paint();
paint.setColor(borderColor);
paint.setStyle(Paint.Style.STROKE);
paint.setStrokeWidth(borderWidth);
paint.setAntiAlias(true);
Rect rect = new Rect(
borderWidth / 2,
borderWidth / 2,
canvas.getWidth() - borderWidth / 2,
canvas.getHeight() - borderWidth / 2
);
// Draw a rectangle as a border/shadow on canvas
canvas.drawRect(rect, paint);
// Draw source bitmap to canvas
canvas.drawBitmap(resized, borderWidth, borderWidth, null);
resized.recycle();
// Return the bordered circular bitmap
return dstBitmap;
}
public void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == CAMERA_REQUEST && resultCode == Activity.RESULT_OK) {
photo = (Bitmap) data.getExtras().get("data");
this.imageView.setImageBitmap(photo);
}
}
}
问题出现在这段代码中：
@Override
public void afterTextChanged(Editable s) {
// TODO Auto-generated method stub
//String ss = date.getText().toString();
int o = 0;
//String regEx ="^(0[1-9]|1[012])[- /.](0[1-9]|[12][0-9]|3[01])[- /.](19|20)\\d{2}$";
/*
if ((ss.charAt(2) == '/') && (ss.charAt(4) == '/')) {
}*/
int ss = date.getInputType();
if (ss == (InputType.TYPE_CLASS_DATETIME | InputType.TYPE_DATETIME_VARIATION_DATE))
{
int dateInput = Integer.parseInt(date.getText().toString());
//(0?[1-9]|[12][0-9]|3[01])/(0?[1-9]|1[012])/((19|20)\\d\\d)
Toast.makeText(EditActivity.this, "Format Is right", Toast.LENGTH_LONG).show();
}
/* if (ss.matches("\\d{4}-\\d{2}-\\d{2}")) {
Toast.makeText(EditActivity.this, "Format Is right", Toast.LENGTH_LONG).show();
}*/
/*if(date.getText().length()<4){
// Display toast
Toast.makeText(getApplicationContext(), "Please enter something !",Toast.LENGTH_LONG).show();
}*/
else {
date.setTextColor(Color.RED);
date.setText("Invalid Format");
}
//ss = "";
}
});
这是validation.java：
package gmbh.package.myselfieme;
import android.widget.EditText;
import java.util.regex.Pattern;
public class Validation {
// Regular Expression
// you can change the expression based on your need
private static final String EMAIL_REGEX = "^[_A-Za-z0-9-\\+]+(\\.[_A-Za-z0-9-]+)*@[A-Za-z0-9-]+(\\.[A-Za-z0-9]+)*(\\.[A-Za-z]{2,})$";
private static final String DATE_REGEX = "^\\d{4}-\\d{2}-\\d{2}$";
// Error Messages
private static final String REQUIRED_MSG = "required";
private static final String EMAIL_MSG = "invalid email";
private static final String DATE_MSG = "###-#######";
// call this method when you need to check email validation
public static boolean isEmailAddress(EditText editText, boolean required) {
return isValid(editText, EMAIL_REGEX, EMAIL_MSG, required);
}
// call this method when you need to check phone number validation
public static boolean isDate(EditText editText, boolean required) {
return isValid(editText, DATE_REGEX, DATE_MSG, required);
}
// return true if the input field is valid, based on the parameter passed
public static boolean isValid(EditText editText, String regex, String errMsg, boolean required) {
String text = editText.getText().toString().trim();
// clearing the error, if it was previously set by some other values
editText.setError(null);
// text required and editText is blank, so return false
if ( required && !hasText(editText) ) return false;
// pattern doesn't match so returning false
if (required && !Pattern.matches(regex, text)) {
editText.setError(errMsg);
return false;
};
return true;
}
// check the input field has any text or not
// return true if it contains text otherwise false
public static boolean hasText(EditText editText) {
String text = editText.getText().toString().trim();
editText.setError(null);
// length 0 means there is no text
if (text.length() == 0) {
editText.setError(REQUIRED_MSG);
return false;
}
return true;
}
}
这是错误消息：
Process: gmbh.packagename.myselfieme, PID: 17795
java.lang.NumberFormatException: Invalid int: "2505250525"
at java.lang.Integer.invalidInt(Integer.java:138)
at java.lang.Integer.parse(Integer.java:413)
at java.lang.Integer.parseInt(Integer.java:367)
at java.lang.Integer.parseInt(Integer.java:334)
at gmbh.packagename.myselfieme.EditActivity$10.afterTextChanged(EditActivity.java:203)
实际上，为什么我需要在输入类型的日期中读取输入，将其转换为整数并检查此整数值是否具有正确的格式？难道还有其他更好的方法吗？我只想检查用户输入的数字是否超过6位，并且这些数字的格式正确。
任何提示或帮助将不胜感激，谢谢！
答案 0 :(得分：1)
首先，你应该使用日期选择器而不是EditText的{{3}}值得考虑。
无论如何，如果你把你的日期作为一个字符串，推荐的验证方法是尝试将其解析为一个日期，看看你是否成功 - 而不是通过正则表达式。而你当然不应该尝试将其解析为整数，这必然会失败。我的代码会像：
String ss = date.getText().toString();
if (ss.isEmpty()) {
// tell the user to enter something
} else {
try {
LocalDate.parse(ss);
// tell the user the format is right
} catch (DateTimeParseException dtpe) {
// tell the user that this is not a valid date
}
}
我假设您的日期应采用yyyy-MM-dd格式。这是LocalDate的默认解析格式，因此如果您了解异常和try / catch构造，则相当简单。如果您需要其他格式，则需要通过DateTimeFormatter指定。
优于正则表达式方法的优势在于它为您提供了更好的验证。 ^\\d{4}-\\d{2}-\\d{2}$将接受2017-29-11和2017-11-92作为日期，如果月份不是1到12或者日期不在天数内，解析方法将会被捕获那个月。
现在，如果您需要保留日期（可能是因为您要求用户输入日期），请将其保留为LocalDate对象而不是字符串。这将准备您的应用程序在该日期进行各种操作。只要您需要字符串，只需使用LocalDate.toString()即可。或者如果您想要字符串，例如“2017年11月19日星期日”，甚至是德语或其他语言，请使用DateTimeFormatter。
我正在使用java.time，现代Java日期和时间API，也称为JSR-310。不幸的是，这还没有大多数Android设备。解决方案是Tim Biegeleisen’s comment，即JSR-310到Android的后端。我鼓励你这样做并开始编码。
答案 1 :(得分：0)
我只想检查用户输入的数字是否超过6位且这些数字的格式是否合适。
让我们说，所需的格式是dd-mm-yy
使用正则表达式 - hexa = input("Please Enter a Hexadecimal : ")
try:
denary = int(hexa, 16)
print("Your Denary number is : ",denary)
...
except ValueError:
print("Not In Range")
option6()
例如，
\d{2}-\d{2}-\d{2}