问题
I get the following exception in Android when clicking a button to take me from an activity to another (I'm new in Android development, so it may not be the brightest of questions):
java.lang.ClassCastException: android.widget.RelativeLayout cannot be cast to android.widget.EditText
I have tried cleaning the project several times, I've tried the option Fix Project Properties from Android Tools, I've checked my xml for mistakes but I just can't seem to figure this out. I have to mention that the button worked well for some time until this exception occurred.
Here is my xml:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/editCustomerPhone"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@android:color/background_dark"
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=".CustomerInfoActivity" >
<FrameLayout
android:id="@+id/frameLayout1"
android:layout_width="wrap_content"
android:layout_height="250dp"
android:layout_alignParentLeft="true"
android:layout_alignParentRight="true"
android:layout_alignParentTop="true"
android:background="@drawable/ic_new_delivery" >
<TextView
android:id="@+id/textView2"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Insert Customer Data:"
android:textColor="@color/light_blue"
android:textSize="20sp"
android:textStyle="italic" />
</FrameLayout>
<EditText
android:id="@+id/editCustomerName"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBaseline="@+id/textView1"
android:layout_alignBottom="@+id/textView1"
android:layout_alignParentRight="true"
android:ems="10"
android:inputType="textPersonName"
android:textColor="@color/light_blue" />
<Button
android:id="@+id/submitInfoBtn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/textView1"
android:layout_alignParentBottom="true"
android:layout_alignRight="@+id/editCustomerName"
android:text="Submit Info"
android:textColor="@color/light_red"
android:onClick="submitCustomerInfo"/>
<EditText
android:id="@+id/editCustomerPhone"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/editCustomerName"
android:layout_alignParentRight="true"
android:layout_alignTop="@+id/TextView01"
android:ems="10"
android:inputType="phone"
android:textColor="@color/light_red" >
<requestFocus />
</EditText>
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_below="@+id/frameLayout1"
android:text="Name:"
android:textAppearance="?android:attr/textAppearanceMedium"
android:textColor="@android:color/background_light"
android:textStyle="bold"
android:typeface="serif" />
<TextView
android:id="@+id/TextView02"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_below="@+id/editCustomerPhone"
android:layout_marginTop="14dp"
android:text="Email:"
android:textAppearance="?android:attr/textAppearanceMedium"
android:textColor="@android:color/background_light"
android:textStyle="bold"
android:typeface="serif" />
<EditText
android:id="@+id/editCustomerEmail"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBaseline="@+id/TextView02"
android:layout_alignBottom="@+id/TextView02"
android:layout_alignLeft="@+id/editCustomerPhone"
android:layout_alignParentRight="true"
android:ems="10"
android:inputType="textEmailAddress"
android:textColor="@color/light_green" />
<TextView
android:id="@+id/TextView01"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/TextView02"
android:layout_below="@+id/editCustomerName"
android:layout_marginTop="19dp"
android:text="Phone:"
android:textAppearance="?android:attr/textAppearanceMedium"
android:textColor="@android:color/background_light"
android:textStyle="bold"
android:typeface="serif" />
Here is my onCreate method in the activity that throws the exception:
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_customer_info);
this.editMail = (EditText)findViewById(R.id.editCustomerEmail);
this.editName = (EditText)findViewById(R.id.editCustomerName);
this.editPhone = (EditText)findViewById(R.id.editCustomerPhone); // the exception points me here
}
回答1:
you code says :
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/editCustomerPhone"
editCustomerPhone is a relativelayout.
回答2:
android:id="@+id/editCustomerPhone"
remove this line
from below tag
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/editCustomerPhone"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@android:color/background_dark"
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=".CustomerInfoActivity" >
you have set it twice. One for relative layout one for edittext
回答3:
I received this error when my main activity.xml did not have the include statement to my content.xml file.
Once i added these lines back into my main activity.xml file, everything was fine again.
<include
android:id="@+id/editText"
layout="@layout/content" />
来源：https://stackoverflow.com/questions/20951847/android-java-lang-classcastexception-android-widget-relativelayout-cannot-be-ca