inflate in merge

Question

Hi I'm trying to inflate my layout with <merge> tag here is my main.xml :

<?xml version="1.0" encoding="utf-8"?>
<merge xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >

    <com.osmgames.kartuves.LinesLayout
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:id="@+id/lines" />

</merge>

This is my LinesLayout.java:

public class LinesLayout extends FrameLayout {

    public LinesLayout(Context context, AttributeSet attrs) {
        super(context, attrs);
    }
    @Override
    protected void onLayout(boolean changed, int l, int t, int r, int b) {
        super.onLayout(changed, l, t, r, b);
    }
    @Override
    public boolean onInterceptTouchEvent(MotionEvent event) {
        super.onInterceptTouchEvent(event);
        return false;
    }
}

And my main.java:

public class main extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
    }}

So I want to inflate the XML below to main.xml. How can I do that?

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="wrap_content"
    android:layout_height="fill_parent">

    <ImageView   
         android:layout_width="40dp" 
         android:layout_height="40dp"
         android:layout_gravity="center" 
         android:layout_marginTop="75dp" 
         android:layout_marginRight="40dp"
         android:src="@drawable/line" />

    <ImageView   
         android:layout_width="40dp" 
         android:layout_height="40dp"
         android:layout_gravity="center" 
         android:layout_marginTop="75dp" 
         android:src="@drawable/line" />

    <ImageView   
         android:layout_width="40dp" 
         android:layout_height="40dp"
         android:layout_gravity="center" 
         android:layout_marginTop="75dp" 
         android:layout_marginLeft="40dp"
         android:src="@drawable/line"  />
</FrameLayout>

This is log I'm getting:

java.lang.RuntimeException: Unable to start activity ComponentInfo{com.osmgames.kartuves/com.osmgames.kartuves.InGame}: android.view.InflateException: <merge /> can be used only with a valid ViewGroup root and attachToRoot=true
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2663)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)
at android.app.ActivityThread.access$2300(ActivityThread.java:125)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:123)
at android.app.ActivityThread.main(ActivityThread.java:4627)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:521)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
at dalvik.system.NativeStart.main(Native Method)

Caused by: android.view.InflateException: <merge /> can be used only with a valid ViewGroup root and attachToRoot=true
at android.view.LayoutInflater.inflate(LayoutInflater.java:320)
at android.view.LayoutInflater.inflate(LayoutInflater.java:276)
at **com.osmgames.kartuves.InGame.onCreate(InGame.java:59)**
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627)
... 11 more

InGame.java:59 is :

58 FrameLayout item = (FrameLayout)findViewById(R.id.lines);
59 View child = getLayoutInflater().inflate(R.layout.letters3, null);
60 item.addView(child);

Answer 1

The merge tag should be used in the inflated layout, it merges itself inside the parent ViewGroup.

Try this :

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="wrap_content"
    android:layout_height="fill_parent">

    <com.osmgames.kartuves.LinesLayout
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:id="@+id/lines" />

</FrameLayout >

and this :

<?xml version="1.0" encoding="utf-8"?>
<merge xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >

    <ImageView   
         android:layout_width="40dp" 
         android:layout_height="40dp"
         android:layout_gravity="center" 
         android:layout_marginTop="75dp" 
         android:layout_marginRight="40dp"
         android:src="@drawable/line" />

    <ImageView   
         android:layout_width="40dp" 
         android:layout_height="40dp"
         android:layout_gravity="center" 
         android:layout_marginTop="75dp" 
         android:src="@drawable/line" />

    <ImageView   
         android:layout_width="40dp" 
         android:layout_height="40dp"
         android:layout_gravity="center" 
         android:layout_marginTop="75dp" 
         android:layout_marginLeft="40dp"
         android:src="@drawable/line" />
</merge>

Hope it will help