我在EnquireActivity中遇到ClassCast Exception。根据logcat，我对EditText和TextView的id有歧义。但是我为它们提供了不同的ID。作为Android的新手，我无法找出它为什么会发生......任何帮助都将不胜感激。
这是我的XML文件activity_enquire.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context=".EnquireActivity" >
<TextView
android:id="@+id/enquire_txt_city"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="City Name/s" />
<EditText
android:id="@+id/enquire_edit_city"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_below="@+id/enquire_txt_city"
android:ems="10"
android:singleLine="false"
android:inputType="textPersonName" >
</EditText>
<TextView
android:id="@+id/enquire_txt_name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/enquire_edit_city"
android:layout_marginTop="16dp"
android:text="Name" />
<EditText
android:id="@+id/enquire_edit_name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBaseline="@+id/enquire_txt_name"
android:layout_alignBottom="@+id/enquire_txt_name"
android:layout_marginLeft="16dp"
android:layout_toRightOf="@+id/enquire_txt_name"
android:ems="10"
android:inputType="textPersonName" />
<EditText
android:id="@+id/enquire_edit_adult"
android:layout_width="60dp"
android:layout_height="wrap_content"
android:layout_alignBaseline="@+id/enquire_txt_adult"
android:layout_alignBottom="@+id/enquire_txt_adult"
android:layout_alignLeft="@+id/enquire_edit_name"
android:ems="10"
android:inputType="number" />
<EditText
android:id="@+id/enquire_edit_child"
android:layout_width="60dp"
android:layout_height="wrap_content"
android:layout_alignBaseline="@+id/enquire_txt_child"
android:layout_alignBottom="@+id/enquire_txt_child"
android:layout_alignRight="@+id/enquire_edit_name"
android:ems="10"
android:inputType="number" />
<TextView
android:id="@+id/enquire_txt_adult"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/enquire_txt_name"
android:layout_below="@+id/enquire_edit_name"
android:layout_marginTop="20dp"
android:text="Adults" />
<TextView
android:id="@+id/enquire_txt_child"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_above="@+id/enquire_txt_email"
android:layout_marginRight="14dp"
android:layout_toLeftOf="@+id/enquire_edit_child"
android:text="Child" />
<TextView
android:id="@+id/enquire_txt_email"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/enquire_txt_adult"
android:layout_below="@+id/enquire_edit_adult"
android:layout_marginTop="22dp"
android:text="Email Address" />
<EditText
android:id="@+id/enquire_edit_email"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/enquire_txt_email"
android:layout_below="@+id/enquire_txt_email"
android:ems="10"
android:inputType="textEmailAddress" />
<TextView
android:id="@+id/enquire_txt_phone"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/enquire_edit_email"
android:layout_centerVertical="true"
android:text="Contact No." />
<EditText
android:id="@+id/enquire_edit_phone"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_below="@+id/enquire_txt_phone"
android:ems="10"
android:inputType="phone" />
<TextView
android:id="@+id/enquire_txt_datedeparture"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/enquire_edit_phone"
android:layout_below="@+id/enquire_edit_phone"
android:text="Departure" />
<EditText
android:id="@+id/enquire_edit_datedeparture"
android:layout_width="100dp"
android:layout_height="wrap_content"
android:layout_above="@+id/chkenquire"
android:layout_alignLeft="@+id/chkenquire"
android:ems="10"
android:inputType="date" >
</EditText>
<TextView
android:id="@+id/enquire_txt_datearrival"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBaseline="@+id/enquire_txt_datedeparture"
android:layout_alignBottom="@+id/enquire_txt_datedeparture"
android:layout_toLeftOf="@+id/enquire_edit_child"
android:text="Arrival" />
<EditText
android:id="@+id/enquire_edit_datearrival"
android:layout_width="100dp"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/enquire_txt_datearrival"
android:layout_below="@+id/enquire_txt_datearrival"
android:ems="10"
android:inputType="date" >
</EditText>
<CheckBox
android:id="@+id/chkenquire"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_above="@+id/btnemail"
android:layout_alignLeft="@+id/btnemail"
android:text="I Confirm These Details Are Relevant As Per My Concern"
android:textSize="11sp" />
<Button
android:id="@+id/btnemail"
android:background="#46C9F4"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_alignParentEnd="true"
android:layout_alignParentBottom="true"
android:textColor="#ffffff"
android:layout_marginBottom="32dp"
android:text="Send Enquiry" />
</RelativeLayout>
这是EnquireActivity.java
package com.example.travelplanner;
import java.util.ArrayList;
import java.util.Calendar;
import android.os.Bundle;
import android.app.Activity;
import android.app.DatePickerDialog;
import android.app.Dialog;
import android.content.Intent;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.DatePicker;
import android.widget.CompoundButton.OnCheckedChangeListener;
import android.widget.EditText;
import android.widget.TextView;
public class EnquireActivity extends Activity implements OnClickListener, OnCheckedChangeListener {
//setting var for datepicker
private int year,year1;
private int month,month1;
private int day,day1;
String date1, date2;
static final int DATE_DIALOG_ID = 0;
static final int DATE2_DIALOG_ID = 1;
Button btn;
StringBuilder stringbuilder;
String to, subject,msg;
String getname,getadult, getchild, getmail, getphone, getdatedept, getdatearr;
ArrayList<String> getChecked;
CheckBox chk;
EditText et_citylist, et_name, et_adult, et_child, et_mail, et_phone, et_datedepart, et_datearrive;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_enquire);
et_citylist = (EditText)findViewById(R.id.enquire_edit_city);
et_name = (EditText)findViewById(R.id.enquire_edit_name);
et_adult = (EditText)findViewById(R.id.enquire_edit_adult);
et_child = (EditText)findViewById(R.id.enquire_edit_child);
et_mail = (EditText)findViewById(R.id.enquire_edit_email);
//line 49
et_phone = (EditText)findViewById(R.id.enquire_edit_phone);
et_datearrive = (EditText)findViewById(R.id.enquire_edit_datearrival);
et_datedepart = (EditText)findViewById(R.id.enquire_edit_datedeparture);
btn = (Button)findViewById(R.id.btnemail);
btn.setVisibility(View.GONE);
btn.setOnClickListener(this);
to = "divyangbhambhani@gmail.com";
subject = "Tour Package Details Summary";
msg = "";
chk = (CheckBox)findViewById(R.id.chkenquire);
chk.setOnCheckedChangeListener(this);
//setting calender for datepicker
Calendar c = Calendar.getInstance();
year = c.get(Calendar.YEAR);
month = c.get(Calendar.MONTH);
day = c.get(Calendar.DAY_OF_MONTH);
year1 = c.get(Calendar.YEAR);
month1 = c.get(Calendar.MONTH);
day1 = c.get(Calendar.DAY_OF_MONTH);
//get Intents
Bundle extras = getIntent().getExtras();
if(extras!=null)
{
getChecked = extras.getStringArrayList("list1");
getname = extras.getString("name");
getadult = extras.getString("adults");
getchild = extras.getString("child");
getmail = extras.getString("email");
getphone = extras.getString("phone");
getdatedept = extras.getString("datedept");
getdatearr = extras.getString("datearr");
stringbuilder = new StringBuilder();
for(String value:getChecked){
stringbuilder.append(value).append(" ");
}
}
//adding citylist to edittext
et_citylist.setText(stringbuilder);
et_name.setText(getname);
et_adult.setText(getadult);
et_child.setText(getchild);
et_mail.setText(getmail);
et_phone.setText(getmail);
et_datearrive.setText(getdatearr);
et_datedepart.setText(getdatedept);
}
@SuppressWarnings("deprecation")
public void showdate(View v) {
showDialog(DATE_DIALOG_ID);
}
@SuppressWarnings("deprecation")
public void showdate1(View v) {
showDialog(DATE2_DIALOG_ID);
}
public void updateDate() {
final String[] MONTHS = {"Jan","Feb","Mar","Apr","May","Jun","Jul","Aug","Sep","Oct","Nov","Dec"};
String mon = MONTHS[month];
et_datedepart.setText(date1);
}
public void updateDate1() {
final String[] MONTHS = {"Jan","Feb","Mar","Apr","May","Jun","Jul","Aug","Sep","Oct","Nov","Dec"};
String mon = MONTHS[month];
et_datearrive.setText(date2);
}
private DatePickerDialog.OnDateSetListener datedialog = new DatePickerDialog.OnDateSetListener() {
@Override
public void onDateSet(DatePicker view, int yy, int mm,
int dd) {
// TODO Auto-generated method stub
month = mm;
day = dd;
year = yy;
date1 = day+"/"+month+"/"+year;
updateDate();
}
};
private DatePickerDialog.OnDateSetListener datedialog2 = new DatePickerDialog.OnDateSetListener() {
@Override
public void onDateSet(DatePicker view, int yy, int mm,
int dd) {
// TODO Auto-generated method stub
month1 = mm;
day1 = dd;
year1 = yy;
date2 = day1+"/"+month1+"/"+year1;
updateDate1();
}
};
protected Dialog onCreateDialog(int id) {
//new DatePick
switch (id) {
case DATE_DIALOG_ID:
return new DatePickerDialog(this,
datedialog, year, month,day);
case DATE2_DIALOG_ID:
return new DatePickerDialog(this,
datedialog2, year, month,day);
}
return null;
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.enquire, menu);
return true;
}
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
//Send Mail
Intent email = new Intent(Intent.ACTION_SEND);
email.putExtra(Intent.EXTRA_EMAIL, new String[]{ to});
//email.putExtra(Intent.EXTRA_CC, new String[]{ to});
//email.putExtra(Intent.EXTRA_BCC, new String[]{to});
email.putExtra(Intent.EXTRA_SUBJECT, subject);
email.putExtra(Intent.EXTRA_TEXT, msg);
//need this to prompts email client only
email.setType("message/rfc822");
startActivity(Intent.createChooser(email, "Choose an Email client :"));
}
@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
// TODO Auto-generated method stub
if(chk.isChecked())
btn.setVisibility(View.VISIBLE);
else
btn.setVisibility(View.GONE);
}
}
Logcat输出：
07-20 12:27:39.078: E/AndroidRuntime(6059): FATAL EXCEPTION: main
07-20 12:27:39.078: E/AndroidRuntime(6059): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.travelplanner/com.example.travelplanner.EnquireActivity}: java.lang.ClassCastException: android.widget.TextView cannot be cast to android.widget.EditText
07-20 12:27:39.078: E/AndroidRuntime(6059): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1967)
07-20 12:27:39.078: E/AndroidRuntime(6059): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1992)
07-20 12:27:39.078: E/AndroidRuntime(6059): at android.app.ActivityThread.access$600(ActivityThread.java:127)
07-20 12:27:39.078: E/AndroidRuntime(6059): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1158)
07-20 12:27:39.078: E/AndroidRuntime(6059): at android.os.Handler.dispatchMessage(Handler.java:99)
07-20 12:27:39.078: E/AndroidRuntime(6059): at android.os.Looper.loop(Looper.java:137)
07-20 12:27:39.078: E/AndroidRuntime(6059): at android.app.ActivityThread.main(ActivityThread.java:4448)
07-20 12:27:39.078: E/AndroidRuntime(6059): at java.lang.reflect.Method.invokeNative(Native Method)
07-20 12:27:39.078: E/AndroidRuntime(6059): at java.lang.reflect.Method.invoke(Method.java:511)
07-20 12:27:39.078: E/AndroidRuntime(6059): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:823)
07-20 12:27:39.078: E/AndroidRuntime(6059): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:590)
07-20 12:27:39.078: E/AndroidRuntime(6059): at dalvik.system.NativeStart.main(Native Method)
07-20 12:27:39.078: E/AndroidRuntime(6059): Caused by: java.lang.ClassCastException: android.widget.TextView cannot be cast to android.widget.EditText
07-20 12:27:39.078: E/AndroidRuntime(6059): at com.example.travelplanner.EnquireActivity.onCreate(EnquireActivity.java:49)
07-20 12:27:39.078: E/AndroidRuntime(6059): at android.app.Activity.performCreate(Activity.java:4465)
07-20 12:27:39.078: E/AndroidRuntime(6059): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049)
07-20 12:27:39.078: E/AndroidRuntime(6059): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1931)
07-20 12:27:39.078: E/AndroidRuntime(6059): ... 11 more
答案 0 :(得分：3)
我找不到任何不匹配的引用。
import android.widget.TextView;
我认为您的活动中不需要上面的包名称只需删除它并重新启动eclipse。这可能会帮到你。