How to align a View's top to another View's vertical center?

Question

I need to align View2 top-left corner to View1 's center, but I cannot figure out how to do it.

Answer 1

Here is how to do it!

Make an xml like

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="200dp"
    android:background="#FFFF99" >

    <LinearLayout
        android:id="@+id/view1"
        android:layout_width="120dp"
        android:layout_height="120dp"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true"
        android:layout_margin="10dp"
        android:background="#440000"
        android:orientation="horizontal" >
    </LinearLayout>

    <LinearLayout
        android:id="@+id/container"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@id/view1"
        android:layout_alignTop="@id/view1"
        android:orientation="horizontal" >

        <LinearLayout
            android:id="@+id/view2"
            android:layout_width="200dp"
            android:layout_height="100dp"
            android:background="#99004400"
            android:orientation="horizontal" >
        </LinearLayout>
    </LinearLayout>

</RelativeLayout>

In your activty

@Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

    }


    @Override
    public void onWindowFocusChanged(boolean hasFocus) {
        // TODO Auto-generated method stub
        super.onWindowFocusChanged(hasFocus);
         LinearLayout v1=(LinearLayout)findViewById(R.id.view1);
            LinearLayout v2=(LinearLayout)findViewById(R.id.view2);
            LinearLayout container=(LinearLayout)findViewById(R.id.container);
            int heightV1=v1.getHeight();
            int widthV1=v1.getWidth();
            container.setPadding(widthV1/2, heightV1/2, 0, 0);
    }

Gives output like

Answer 2

try this

  RelativeLayout.LayoutParams gpsViewLayoutParams = new     RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.WRAP_CONTENT, RelativeLayout.LayoutParams.WRAP_CONTENT );
gpsViewLayoutParams.addRule(RelativeLayout.ALIGN_PARENT_TOP);
gpsViewLayoutParams.addRule(RelativeLayout.ALIGN_RIGHT);
this.relativeLayout.addView(gpsView,gpsViewLayoutParams); 

Answer 3

Is this of any help to you?

<RelativeLayout>
<View1 />
<View2
 Layout_marginTop= (view1Height/2)+view1margin
 Layout_marginLeft=(view1Width/2)+view1margin /> 
</RelativeLayout>