本文将分享Androidjava.lang.ClassCastException:android.widget.LinearLayout无法强制转换为android.widget.TextView的详
本文将分享Android java.lang.ClassCastException:android.widget.LinearLayout无法强制转换为android.widget.TextView的详细内容,此外,我们还将为大家带来关于:java.lang.ClassCastException: android.widget.LinearLayout$LayoutParams cannot be cast to androi...、Android ClassNotFound和android.view.InflateException:、Android java.lang.ClassCastException:无法将android.widget.RelativeLayout强制转换为android.widget.EditText、android – ClassCastException LinearLayout LayoutParams的相关知识,希望对你有所帮助。
本文目录一览:- Android java.lang.ClassCastException:android.widget.LinearLayout无法强制转换为android.widget.TextView
- :java.lang.ClassCastException: android.widget.LinearLayout$LayoutParams cannot be cast to androi...
- Android ClassNotFound和android.view.InflateException:
- Android java.lang.ClassCastException:无法将android.widget.RelativeLayout强制转换为android.widget.EditText
- android – ClassCastException LinearLayout LayoutParams
Android java.lang.ClassCastException:android.widget.LinearLayout无法强制转换为android.widget.TextView
我正在尝试打印listView中单击的值,但后来我得到以下异常:
07-04 10:40:56.482: E/AndroidRuntime(1356): FATAL EXCEPTION: main
07-04 10:40:56.482: E/AndroidRuntime(1356): java.lang.classCastException: android.widget.LinearLayout cannot be cast to android.widget.TextView
07-04 10:40:56.482: E/AndroidRuntime(1356): at com.passwordkeeper.ui.ActivityHomeScreen$1.onItemClick(ActivityHomeScreen.java:88)
这是一段代码:
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
mTextView = (TextView) findViewById(R.id.labelList);
db = new DatabaseHandler(this);
createList();
displayList();
}
createList函数正常工作.这是我的displayList方法:
public void displayList(){
this.setlistadapter(new ArrayAdapter<String>(this, R.layout.activity_home_screen, R.id.listTextView, mAccountNames));
mListView = getListView();
mListView.setonItemClickListener(new OnItemClickListener(){
public void onItemClick(AdapterView<?> parent, View view, int position,
long id) {
String product = ((TextView) view).getText().toString();
Log.v("mSelectedProduct", product);
}
});
}
我的文件activity_home_screen.xml的xml代码是:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<TextView
android:id="@+id/listTextView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="28dp"
android:layout_marginTop="26dp"
android:textAppearance="?android:attr/textAppearanceLarge" />
任何帮助都会有用!
谢谢.
解决方法:
你可以试试这个
mListView.setonItemClickListener(new OnItemClickListener(){
public void onItemClick(AdapterView<?> parent, View view, int position,
long id) {
TextView txtview = (TextView)view.findViewById(R.id.listTextView);
String product = txtview.getText().toString();
Log.v("mSelectedProduct", product);
}
});
:java.lang.ClassCastException: android.widget.LinearLayout$LayoutParams cannot be cast to androi...
:java.lang.ClassCastException: android.widget.LinearLayout$LayoutParams cannot be cast to android.widget.RelativeLayout$LayoutParams
这个错首先说明:类型转化异常
解决方法:
一、详细检查是否将某种组件强制转换为另一种类型
二、本地声明类型是否与布局文件中的一致
三、获取的布局参数的父类和布局文件不一致
总之,要细心将布局文件类型与activity中的一致。
Android ClassNotFound和android.view.InflateException:
我正在尝试将facebook整合到我的应用程序中.我使用从facebook下载的facebook示例应用程序作为参考(也在developer.facebook生成了appId和所有这个过程).我很懒,所以我不想通过所有的facebook sdk的代码.简单来说,我只是在我的应用程序中添加com_android_facebook库项目,并复制我的应用程序中的facebook示例应用程序中的所有类,Example.java除外
现在我修改MyActivity类看起来像Example.java类,意味着MyActivity现在拥有Example类的所有代码以及我的主Activity.
我改变了我的应用程序的布局
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
xmlns:android="http://schemas.android.com/apk/res/android"
>
<TextView
android:id="@+id/text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="TextView"
android:layout_centerVertical="true"
android:layout_centerHorizontal="true"
android:textSize="22px"
android:textColor="#ff00ff"
android:gravity="center"
>
</TextView>
<com.android.facebook.LoginButton
android:id="@+id/login"
android:src="@drawable/login"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
/>
<Button android:id="@+id/uploadButton"
android:text="@string/upload"
android:visibility="invisible"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:paddingRight="20dp"
android:paddingLeft="20dp"
android:layout_margin="20dp"
/>
<Button android:id="@+id/requestButton"
android:text="@string/request"
android:visibility="invisible"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:paddingRight="20dp"
android:paddingLeft="20dp"
android:layout_margin="20dp"
/>
<Button android:id="@+id/postButton"
android:text="@string/post"
android:visibility="invisible"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:paddingRight="20dp"
android:paddingLeft="20dp"
android:layout_margin="20dp"
/>
<Button android:id="@+id/deletePostButton"
android:text="@string/delete"
android:visibility="invisible"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:paddingRight="20dp"
android:paddingLeft="20dp"
android:layout_margin="20dp"
/>
</RelativeLayout>
现在当我运行我的应用程序时,我遇到了错误
10-14 00:58:37.786: ERROR/AndroidRuntime(3971): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.android.myapp/com.android.myapp.MyActivity}: android.view.InflateException: Binary XML file line #21: Error inflating class com.android.facebook.LoginButton
10-14 00:58:37.786: ERROR/AndroidRuntime(3971): Caused by: android.view.InflateException: Binary XML file line #21: Error inflating class com.android.facebook.LoginButton
10-14 00:58:37.786: ERROR/AndroidRuntime(3971): Caused by: java.lang.classNotFoundException: com.android.facebook.LoginButton in loader dalvik.system.PathClassLoader@44c06850
任何帮助,建议是最受欢迎的…
解决方法:
该SDK的主要源代码中没有LoginButton.
它仅在示例代码中可用,因此它无法加载不可用的类(ClassNotFoundException)…
Android java.lang.ClassCastException:无法将android.widget.RelativeLayout强制转换为android.widget.EditText
单击按钮将我从一个活动带到另一个活动时,我在Android中收到以下异常(我是Android开发中的新手,因此可能不是最聪明的问题):
java.lang.classCastException: android.widget.RelativeLayout cannot be cast to android.widget.EditText
我试过几次清理项目,尝试过Android Tools中的Fix Project Properties选项,已经检查了xml中的错误,但似乎无法弄清楚.我不得不提到,在发生此异常之前,该按钮可以正常工作一段时间.
这是我的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:text/> </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:textandroid: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:textandroid: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:textandroid:typeface="serif" />
@H_301_17@这是我在活动中引发异常的onCreate方法:
@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 }
@H_301_17@解决方法:
您的代码说:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:id="@+id/editCustomerPhone"
@H_301_17@editCustomerPhone是相对布局.
android – ClassCastException LinearLayout LayoutParams
12-22 16:00:37.620: W/System.err(7235): java.lang.classCastException: android.widget.FrameLayout$LayoutParams cannot be cast to android.widget.LinearLayout$LayoutParams 12-22 16:00:37.625: W/System.err(7235): at com.coover.eu.lostandfound.ListSearchFragment.onViewCreated(ListSearchFragment.java:184) 12-22 16:00:37.625: W/System.err(7235): at android.support.v4.app.FragmentManagerImpl.movetoState(FragmentManager.java:884) 12-22 16:00:37.630: W/System.err(7235): at android.support.v4.app.FragmentManagerImpl.movetoState(FragmentManager.java:1080) 12-22 16:00:37.630: W/System.err(7235): at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:622) 12-22 16:00:37.630: W/System.err(7235): at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1416) 12-22 16:00:37.630: W/System.err(7235): at android.support.v4.app.FragmentActivity.onStart(FragmentActivity.java:505) 12-22 16:00:37.630: W/System.err(7235): at android.app.Instrumentation.callActivityOnStart(Instrumentation.java:1178) 12-22 16:00:37.635: W/System.err(7235): at android.app.Activity.performStart(Activity.java:5216) 12-22 16:00:37.635: W/System.err(7235): at android.app.ActivityThread.performlaunchActivity(ActivityThread.java:2083) 12-22 16:00:37.635: W/System.err(7235): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2135) 12-22 16:00:37.635: W/System.err(7235): at android.app.ActivityThread.access$700(ActivityThread.java:140) 12-22 16:00:37.635: W/System.err(7235): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1237) 12-22 16:00:37.640: W/System.err(7235): at android.os.Handler.dispatchMessage(Handler.java:99) 12-22 16:00:37.640: W/System.err(7235): at android.os.Looper.loop(Looper.java:137) 12-22 16:00:37.640: W/System.err(7235): at android.app.ActivityThread.main(ActivityThread.java:4921) 12-22 16:00:37.640: W/System.err(7235): at java.lang.reflect.Method.invokeNative(Native Method) 12-22 16:00:37.640: W/System.err(7235): at java.lang.reflect.Method.invoke(Method.java:511) 12-22 16:00:37.645: W/System.err(7235): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1038) 12-22 16:00:37.645: W/System.err(7235): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:805) 12-22 16:00:37.645: W/System.err(7235): at dalvik.system.NativeStart.main(Native Method)
膨胀的布局:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" android:id="@+id/container_found_list_overview"> <EditText android:id="@+id/search_Box" android:layout_width="fill_parent" android:layout_height="50dp" android:padding="5dp" android:textSize="35sp" android:hint="@string/search" android:inputType="text" android:maxLines="1"/> <ListView android:layout_width="match_parent" android:layout_height="match_parent" android:id="@+id/overview_list_view"> </ListView> </LinearLayout>
代码:
LinearLayout myView = (LinearLayout)this.getView().findViewById(R.id.container_found_list_overview); Log.d("found container",""+(myView != null)); try{ LayoutParams lp = (LayoutParams) myView.getLayoutParams(); lp.weight = 1; lp.width = 0; myView.setLayoutParams(lp); } catch(RuntimeException e){ Log.e("cant get layoutparams",e.getMessage()); e.printstacktrace(); }
解决方法
为什么是父母的类型?这是因为他们存储对父母有用的信息.如果要检索EditText或ListView的布局参数,您将获得LinearLayout $LayoutParams.
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