ClassCastException for android.widget.LinearLayout

Question

I have designed the layout for one of my activities but i am getting strange error . This is simple activity actually it is main menu activity which contains imagebuttons in it.

"07-12 16:40:22.599: E/AndroidRuntime(1857): Caused by: java.lang.ClassCastException: android.widget.LinearLayout
"

Here is my layout xml Code

<?xml version="1.0" encoding="utf-8"?>
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/scrollView1"
    android:layout_width="match_parent"
    android:layout_height="fill_parent" >


    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="fill_parent"
        android:background="@drawable/rpg"
        android:orientation="vertical" >

        <TableLayout
            android:id="@+id/tableLayout1"
            android:layout_width="match_parent"
            android:layout_height="match_parent" >

            <TableRow
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:gravity="center" >

                <TextView android:text="                                 " />
            </TableRow>

            <TableRow
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:gravity="center" >

                <TextView android:text="                                 " />
            </TableRow>

            <TableRow
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:gravity="center" >

                <TextView android:text="                                 " />
            </TableRow>

            <TableRow
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:gravity="center" >

                <TextView android:text="                                 " />
            </TableRow>

            <TableRow
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:gravity="center" >

                <TextView android:text="                                 " />
            </TableRow>

            <TableRow
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:gravity="center" >

                <TextView android:text="                                 " />
            </TableRow>

            <TableRow
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:gravity="center" >

                <TextView android:text="                                 " />
            </TableRow>

            <TableRow
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:gravity="center" >

                <TextView android:text="                                 " />
            </TableRow>

            <TableRow
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:gravity="center" >

                <TextView android:text="                            " />
            </TableRow>

            <TableRow
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:gravity="center" >

                <TextView android:text="                             " />
            </TableRow>

            <TableRow
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:gravity="center" >

                <TextView android:text="                                 " />
            </TableRow>

            <TableRow
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:gravity="center" >

                <ImageButton
                    android:id="@+id/profile_btn"
                    android:layout_width="100dp"
                    android:layout_height="100dp"
                    android:src="@drawable/a1" />

                <TextView android:text=" " />

                <ImageButton
                    android:id="@+id/share_btn"
                    android:layout_width="100dp"
                    android:layout_height="100dp"
                    android:src="@drawable/a2" />
            </TableRow>

            <TableRow
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:gravity="center" >

                <TextView android:text="                              " />
            </TableRow>

            <TableRow
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:gravity="center" >
            </TableRow>

            <TableRow
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:gravity="center" >

                <TextView android:text="                                 " />
            </TableRow>

            <TableRow
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:gravity="center" >

                <ImageButton
                    android:id="@+id/settings_btn"
                    android:layout_width="100dp"
                    android:layout_height="100dp"
                    android:src="@drawable/a3" />

                <TextView android:text="  " />

                <ImageButton
                    android:id="@+id/contacts_btn"
                    android:layout_width="100dp"
                    android:layout_height="100dp"
                    android:src="@drawable/a4" />
            </TableRow>

            <TableRow
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:gravity="center" >

                <TextView android:text="                                 " />
            </TableRow>

            <TableRow
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:gravity="center" >

                <ImageButton
                    android:id="@+id/exit_btn"
                    android:layout_width="100dp"
                    android:layout_height="100dp"
                    android:src="@drawable/a5" />

                <TextView android:text="  " />

                <ImageButton
                    android:id="@+id/amazon_btn"
                    android:layout_width="100dp"
                    android:layout_height="100dp"
                    android:src="@drawable/amazon" />
            </TableRow>
        </TableLayout>

        <LinearLayout
            android:id="@+id/ban2_mainmenu"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentBottom="true"
            android:layout_centerHorizontal="true"
            android:background="@drawable/ban_2" >
        </LinearLayout>

        <LinearLayout
            android:id="@+id/ban1_mainmenu"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentTop="true"
            android:layout_alignRight="@+id/ban2_mainmenu"
            android:background="@drawable/ban_1" >
        </LinearLayout>
    </RelativeLayout>

</ScrollView>

In java at first line of this code below i am getting error

 ImageButton amazon = (ImageButton) findViewById(R.id.amazon_btn);
        amazon.setOnClickListener(new View.OnClickListener() {

            public void onClick(View arg0) {
                // TODO Auto-generated method stub

                Intent browse = new Intent(Intent.ACTION_VIEW, Uri
                        .parse("http://www.amazon.com/gp/product/B0084FCDKS"));
                startActivity(browse);

            }
        });

Error is

07-12 16:40:22.599: E/AndroidRuntime(1857): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.colony.rpgbluetoothchatlite/com.colony.rpgbluetoothchatlite.Menu_Main}: java.lang.ClassCastException: android.widget.LinearLayout
07-12 16:40:22.599: E/AndroidRuntime(1857): Caused by: java.lang.ClassCastException: android.widget.LinearLayout

Once Just clean your project and run. And, restart your workspace and try it also — Praveenkumar, Jul 12 '12 at 12:04
Change the relative layout to linear layout table layout will be applicable to this only as you also did not perfectly set property of xml file — AkashG, Jul 12 '12 at 12:09
@user1155908 no error in your xml code and just clean your project and run again. — Dipak Keshariya, Jul 12 '12 at 12:11
@user1155908 your layout and xml are fine. try rebuild again — sunil, Jul 12 '12 at 12:28
I had the same issue when moving a Spinner into a LinearLayout-- it kept crashing on me. Clean didn't fix it, but restarted Eclipse and deleting the app from my device did the trick. — RyanG, Oct 18 '12 at 13:17

score 2 · Answer 1 · answered Jul 12 '12 at 12:07

Can you paste your full logcat error? Coz I think you are trying to use one of the LinearLayouts defined in your xml file in your Java code (maybe one of the last two linearlayouts) and you have not declared them properly.

And try cleaning your project and run it once. Sometimes this happens in Android, I've noticed too.

score 2 · Accepted Answer · edited Mar 17 '13 at 20:25

In your com.colony.rpgbluetoothchatlite.Menu_Main class...

find out where you call something like this.. I made the variable button.. but yours should be something else...

What's happening is.. your R.id.ban1_mainmenu is a RelativeLayout... but you are trying to convert it to a different class... in this case I am converting to Button class.. which will throw the same exception you have...

Button btn1 = findViewById(R.id.ban1_mainmenu);
Button btn2 = findViewById(R.id.ban2_mainmenu);

to fix it..

LinearLayout btn1 = (LinearLayout)findViewById(R.id.ban1_mainmenu);
RelativeLayout btn2 = findViewById(R.id.ban2_mainmenu);

score 1 · Answer 3 · answered Mar 17 '13 at 20:03

This error appears mostly due to wrong type casting. e.g. below code: same error created trouble for me in listView I'm pasting code:

List.setOnItemClickListener(new AdapterView.OnItemClickListener() {
                @Override
                public void onItemClick(AdapterView<?> parentAdapter,
                        View view, int position, long id) {
                    // The below line of TextView will generate same problem..
                    TextView clickedView = (TextView) view;
                    Toast.makeText(
                            ActivityName.this,
                            "Item with id [" + id + "] - Position ["
                                    + position + "] - Planet ["
                                    /*+ clickedView.getText()*/ + "]",
                            Toast.LENGTH_SHORT).show();
                }
            });

score 0 · Answer 4 · answered Oct 30 '13 at 01:37

0

This sounds like all you need to do is a clean project. This sometimes happens when you first put a scrolView in place. A clean sweep should do the trick, however.

answered Oct 30 '13 at 01:37

PearsonArtPhoto

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ClassCastException for android.widget.LinearLayout

4 Answers4