Develop Reference

Code okay and yet I get error - XML document structures must start and end within the same entity

I am taking the first step into android programming and XML. I am using the Big Nerd Ranch Guide book. In Eclipse, I used the XML given in the book and I got the error XML document structures must start and end within the same entity.
How do I fix this?
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center"
android:orientation="vertical" >
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:padding="24dp"
android:text="#string/question_text" />
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/true_button" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/false_button" />
</LinearLayout>
</LinearLayout>

Problem is solved. I removed the code and saved the xml file. After that, I replaced it with the above code and saved. The error is gone. It was probably a remanant from the time when "automatically build project" was enabled.
Strange.

Cannot resolve symbol 'container' - Android Studio

I just created a new projet, building some layouts, writing some code. Everything was fine except I got this error as shown in the picture below.
I tried to remove and type it again and when typing 'R.id.', there was no 'container' showing up in the list. So that means theres no problem with my R file, just that the 'container' word lost somewhere.
Those code above are actually default code in onCreate() method in your main activity everytime you create a new project in Android Studio. (I actually tried to create a new project to compare and yes it's the same, and without error as it's brand new.).
All I did was comment out the if statement block so the error goes away, and the application has run just fine on the emulator. I just don't know why I got that problem and how I can handle it as I may need to do that in the future. Thank you!
Edit after #Raghunandan has mentioned: Below is my xml.
<RelativeLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
xmlns:android="http://schemas.android.com/apk/res/android">
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="#string/provide_information"
android:id="#+id/provideInfoButton"
android:layout_alignParentTop="true" />
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="#string/take_picture"
android:id="#+id/takePictureButton"
android:layout_below="#+id/provideInfoButton"
android:layout_alignParentLeft="true" />
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/imageView"
android:layout_below="#+id/takePictureButton"
android:layout_centerHorizontal="true"
android:layout_marginTop="28dp" />
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceMedium"
android:id="#+id/classNameTextView"
android:layout_above="#+id/personNametextView2"
android:layout_centerHorizontal="true"
android:layout_marginBottom="44dp" />
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceMedium"
android:layout_marginBottom="38dp"
android:layout_above="#+id/emailTextView"
android:layout_alignLeft="#+id/emailTextView"
android:id="#+id/personNameTextView" />
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceMedium"
android:id="#+id/emailTextView"
android:layout_alignParentBottom="true"
android:layout_alignLeft="#+id/classNameTextView"
android:layout_marginBottom="82dp" />
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="#string/send_button"
android:id="#+id/sendButton"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true" />
</RelativeLayout>

The reason is that I changed the root layout to RelativeLayout (the default of Android Studio was FrameLayout which has an id of "container"). My bad :). Thanks for mentioning about posting the xml file. I have not noticed that as I'm not as familiar with Android Studio as with Eclipse yet.

Bizarre exceptions being thrown in android activity

So, I have an android app to finish making for a project, the same one as I asked questions about here before but this time I'm having trouble with a completely different aspect. Since the app is about Pokémon, in one activity I have some TextViews, EditTexts and a button set up to make an IV calculator. If you're curious and don't know what "IVs" are in Pokémon, google it of course. Anyway, getting back on track...this image here I put together highlights my problem
Above the boxed line you see there is a ClassCastException thrown saying cannot cast from type TextView to EditText...I know what that means in a general sense but I cannot fathom why it is occurring here because as you can see in the relevant line of code (which i pasted into the image) the part of that line that involves casting is casting from View (return type of findViewById) to EditText. The arg R.id.EditText06 IS referring to an EditText in my activity so I don't see where the bad casting attempt is supposedly occurring. Just for a little clarification of the context of this, this is part of stuff coded into the OnClickListener of the button.
Apologies if this question seems perhaps incomplete as regards content shown about the problem but it is quite late for me (so much so that I'm going to bed upon posting this) and please do ask for me to post other stuff if you feel you need it to try to help me.
EDIT: here is my xml file for the activity in question. http://pastebin.com/g5B8d393
EDIT2: OK now this is getting worse :( My current setup is that I have a sort of dummy main activity with just a button to launch an activity. While testing I changed which one it was to launch as desired...until some time last night (and I really don't see what could've started this problem) it worked fine with my IVCalculatorActvity once I had it working fully and properly, and with the other activity. But now, it just crashes when I hit the button in the main activity...I'm just going to upload the project somewhere. (http://www.filehosting[DOT]org/file/details/429262/PokeUtility.zip)
Grrr...curse this reputation restriction on link posting >.>
I understand the reasoning but meh...
EDIT3: apologies for ssuch sudden editing but I only just saw you latest post now HalR. Testing app atm.

findViewById doesn't return an object of class View, but of whatever class that object is indicated in your XML file. Whatever you think you are describing your EditText06 as in your XML, it thinks its a TextView instead of and EditText. Double check and make sure you aren't defining the id="EditText06" in more than one spot.
If you show your xml, It would likely be easier for someone to point out the specific problem in your xml file.
You need to use the format "#+id/..." once for each label, the first time it shows up (either as a reference or as an id". Otherwise you generate multiple labels. I edited your file the way I think it needs.
<?xml version="1.0" encoding="utf-8"?>
<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=".IVCalculatorActivity" >
<Button
android:id="#+id/button3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true"
android:text="#string/calculate" />
<EditText
android:id="#+id/EditText01"
android:layout_width="140dp"
android:layout_height="wrap_content"
android:layout_alignBaseline="#+id/textViewD"
android:layout_alignBottom="#id/textViewD"
android:layout_alignLeft="#+id/EditText05"
android:ems="10" />
<EditText
android:id="#+id/EditText03"
android:layout_width="140dp"
android:layout_height="wrap_content"
android:layout_alignBaseline="#+id/textView5"
android:layout_alignBottom="#id/textView5"
android:layout_alignLeft="#+id/EditText02"
android:ems="10" />
<EditText
android:id="#+id/EditText04"
android:layout_width="140dp"
android:layout_height="wrap_content"
android:layout_alignBaseline="#+id/textView6"
android:layout_alignBottom="#id/textView6"
android:layout_alignLeft="#+id/EditText03"
android:ems="10" />
<TextView
android:id="#+id/textViewA"
android:layout_width="400dp"
android:layout_height="wrap_content"
android:layout_alignLeft="#+id/textViewC"
android:layout_alignParentTop="true"
android:text="#string/IVcalcHeader" />
<TextView
android:id="#id/textViewC"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="#id/textViewD"
android:layout_below="#id/textViewA"
android:layout_marginTop="26dp"
android:text="Stat" />
<EditText
android:id="#id/EditText05"
android:layout_width="140dp"
android:layout_height="wrap_content"
android:layout_alignBaseline="#id/textViewC"
android:layout_alignBottom="#id/textViewC"
android:layout_alignRight="#id/textViewA"
android:ems="10" />
<TextView
android:id="#id/textViewD"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="#+id/textViewB"
android:layout_below="#id/EditText05"
android:layout_marginTop="27dp"
android:text="Stat value" />
<EditText
android:id="#+id/EditText02"
android:layout_width="140dp"
android:layout_height="wrap_content"
android:layout_alignBaseline="#id/textViewB"
android:layout_alignBottom="#id/textViewB"
android:layout_alignLeft="#id/EditText01"
android:ems="10" />
<TextView
android:id="#id/textViewB"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="#id/textView5"
android:layout_below="#id/EditText01"
android:layout_marginTop="28dp"
android:text="Level" />
<TextView
android:id="#id/textView5"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="#id/textView6"
android:layout_centerVertical="true"
android:text="EV count" />
<TextView
android:id="#id/textView6"
android:layout_width="100dp"
android:layout_height="30dp"
android:layout_alignRight="#id/button3"
android:layout_below="#+id/EditText03"
android:layout_marginTop="29dp"
android:text="Base Stat" />
<TextView
android:id="#+id/textViewE"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="#id/textView6"
android:layout_below="#id/textView6"
android:layout_marginTop="40dp"
android:text="Nature" />
<TextView
android:id="#+id/textView7"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="#id/EditText04"
android:layout_alignTop="#id/button3"
android:text=" " />
<EditText
android:id="#+id/EditText06"
android:layout_width="140dp"
android:layout_height="wrap_content"
android:layout_alignBaseline="#id/textViewE"
android:layout_alignBottom="#id/textViewE"
android:layout_alignLeft="#id/textView7"
android:ems="10" />
</RelativeLayout>

Android: My app crashes suddenly

I have been tweaking my main xml layout, adjusting the different views' positions in my relative layout, and suddenly when I started it on my emulator, it crashed with the message:ClassCastException
My XML :
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:gravity="center" >
<com.example.bingbong.Render
android:id="#+id/render"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:background="#color/pattern5"
android:clickable="true" />
<TextView
android:id="#+id/fps"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_alignParentTop="true"
android:text="fpasds"
android:textAppearance="?android:attr/textAppearanceLarge" />
<TextView
android:id="#+id/score_top"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:text="asd"
android:textAppearance="?android:attr/textAppearanceLarge" />
<TextView
android:id="#+id/score_bot"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_alignParentBottom="true"
android:text="asfa"
android:textAppearance="?android:attr/textAppearanceLarge" />
</RelativeLayout>
The error log:
10-30 20:25:33.266: E/AndroidRuntime(269): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.bingbong/com.example.bingbong.Main_Activity}: java.lang.ClassCastException: android.widget.TextView
...
10-30 20:25:33.266: E/AndroidRuntime(269): Caused by: java.lang.ClassCastException: android.widget.TextView
10-30 20:25:33.266: E/AndroidRuntime(269): at com.example.bingbong.Main_Activity.onCreate(Main_Activity.java:26)
The Main_Activity - where line 26 is :
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
WindowManager.LayoutParams.FLAG_FULLSCREEN);
setContentView(R.layout.main_layout);
r = (Render) findViewById(R.id.render); // <--- Line 26.
r.setView((TextView)findViewById(R.id.fps),(TextView)findViewById(R.id.score_top),(TextView)findViewById(R.id.score_bot));
}

I get this occasionally if I am moving around views or changing the types of views (ie, a TextView change to a Button, or something like that). What usually fixes it for me is to do a clean build.
In the "Project" menu in Eclipse, select "Clean..." and either do all projects or select that particular project.

Yo need clean the project, I got this error frequently

Android ClassNotFound and android.view.InflateException:

I m trying to integrate the facebook in my app.I am using facebook example app downloaded from facebook as a reference(also generated the appId and all this process on developer.facebook).I am little lazy so I do not want to go through all the code of facebook sdk.In simple words i just add the com_android_facebook library project in my app, and also copy all the classes in facebook example app in my app except Example.java
Now i modify the MyActivity class look like Example.java class, means MyActivity now have all the code of Example class and also my main Activity.
and i change the layout of my app as
<?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>
Now when i run my app i am getting there errors
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
Any help, suggestions are most welcome...

I also faced the same issue. I changed the main.xml from:
<com.facebook.android.LoginButton
android:id="#+id/login"
android:src="#drawable/login_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="30dp"
/>
to (Current package is com.facebook.fbtest_simple):
<com.facebook.fbtest_simple.LoginButton
android:id="#+id/login"
android:src="#drawable/login_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="30dp"
/>
As LoginButton is not part of FB standard library.

As of version 3.0 of the Facebook SDK, the LoginButton is now available as part of the SDK as
com.facebook.widget.LoginButton
See https://developers.facebook.com/docs/reference/android/3.0/LoginButton
Note that Facebook's own upgrade instructions here reference the wrong package, the LoginButton must be declared as com.facebook.widget.LoginButton, not com.facebook.LoginButton

There is no LoginButton in the main source of that SDK.
It's available in the sample code only, so it just fails to load the unavailable class (ClassNotFoundException)...

Easy one :
10-14 00:58:37.786: ERROR/AndroidRuntime(3971): Caused by: java.lang.ClassNotFoundException: com.android.facebook.LoginButton in loader dalvik.system.PathClassLoader#44c06850
Looking for in the facebook src , you can go to this path:
AsyncFacebookRunner.java , Facebook.java, FacebookError.java ,
FbDialog.java, Util.java
..And see that there isn't nothing like LoginButton , then i can think that you are using an old tutorial or something like that.

Initializing the Facebook SDK is what worked for me.
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
FacebookSdk.sdkInitialize(this.getApplicationContext());
setContentView(R.layout.activity_login);
}