我在android应用程序中创建查询表单时遇到了一些问题。logcat显示ClassCast错误。我是安卓系统的初学者，所以我不知道如何处理它。错误在第50行。
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);
et_phone = (EditText)findViewById(R.id.enquire_edit_phone);
et_datearrive = (EditText)findViewById(R.id.enquire_edit_datearrival);
//LINE 50 -
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);
}
Logcat:
07-17 01:42:59.420: E/AndroidRuntime(31134): FATAL EXCEPTION: main
07-17 01:42:59.420: E/AndroidRuntime(31134): 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
07-17 01:42:59.420: E/AndroidRuntime(31134): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1967)
07-17 01:42:59.420: E/AndroidRuntime(31134): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1992)
07-17 01:42:59.420: E/AndroidRuntime(31134): at android.app.ActivityThread.access$600(ActivityThread.java:127)
07-17 01:42:59.420: E/AndroidRuntime(31134): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1158)
07-17 01:42:59.420: E/AndroidRuntime(31134): at android.os.Handler.dispatchMessage(Handler.java:99)
07-17 01:42:59.420: E/AndroidRuntime(31134): at android.os.Looper.loop(Looper.java:137)
07-17 01:42:59.420: E/AndroidRuntime(31134): at android.app.ActivityThread.main(ActivityThread.java:4448)
07-17 01:42:59.420: E/AndroidRuntime(31134): at java.lang.reflect.Method.invokeNative(Native Method)
07-17 01:42:59.420: E/AndroidRuntime(31134): at java.lang.reflect.Method.invoke(Method.java:511)
07-17 01:42:59.420: E/AndroidRuntime(31134): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:823)
07-17 01:42:59.420: E/AndroidRuntime(31134): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:590)
07-17 01:42:59.420: E/AndroidRuntime(31134): at dalvik.system.NativeStart.main(Native Method)
07-17 01:42:59.420: E/AndroidRuntime(31134): Caused by: java.lang.ClassCastException: android.widget.TextView cannot be cast to android.widget.EditText
07-17 01:42:59.420: E/AndroidRuntime(31134): at com.example.travelplanner.EnquireActivity.onCreate(EnquireActivity.java:50)
07-17 01:42:59.420: E/AndroidRuntime(31134): at android.app.Activity.performCreate(Activity.java:4465)
07-17 01:42:59.420: E/AndroidRuntime(31134): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049)
修订：这是我的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:i1d="@+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/textView1"
android:layout_alignBottom="@+id/textView1"
android:layout_alignLeft="@+id/enquire_txt_child"
android:text="Arrival" />
<EditText
android:id="@+id/enquire_edit_datearrival"
android:layout_width="100dp"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/textView2"
android:layout_below="@+id/textView2"
android:ems="10"
android:inputType="date" />
<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>
当您给定TextView的id并将其投射到EditText视图时，就会出现此异常。
只需检查您的所有id是否正确，并且此id的类型为EditText视图。
et_datedepart = (EditText)findViewById(R.id.enquire_edit_datedeparture);
可能是"R.id.enquire_edit_datedeparture"是TextView&这就是它给class cast exception. 的方式
et_datedperart将是EditText，对吗？
检查您的activity_enquire.xml。
您正试图将TextView的ID分配给EditText，这就是您获得ClassCastException的原因。