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1.FrameLayout

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<frameLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:id="@+id/linearLayout"    android:layout_width="fill_parent"    android:layout_height="fill_parent"    tools:context=".MainActivity" >                            </frameLayout>

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btn = (Button) findViewById(R.id.btn1);btn.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {RelativeLayout.LayoutParams lp = new RelativeLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT,ViewGroup.LayoutParams.WRAP_CONTENT);if(i == 1){i = 0;lp.addRule(RelativeLayout.CENTER_IN_PARENT,RelativeLayout.TRUE);}else{i = 1;lp.addRule(RelativeLayout.ALIGN_PARENT_TOP,RelativeLayout.TRUE);}btn.setLayoutParams(lp);}});

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@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);int[] col = {Color.BLUE,Color.BLACK};GradientDrawable gd = new GradientDrawable(Orientation.TOP_BOTTOM, col);getWindow().setBackgroundDrawable(gd);}

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