以下の例を参照してください (ボタンをクリックすると、中央に移動します)。
activity_main.xml :
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/root"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<Button
android:id="@+id/my_view"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentRight="true"
android:text="Menu" />
</RelativeLayout>
MainActivity.java :
public class MainActivity extends Activity {
private View mView;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mView = findViewById(R.id.my_view);
mView.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
ViewGroup.LayoutParams vg_lp = mView.getLayoutParams();
// Make sure we are in RelativeLayout
if (vg_lp instanceof RelativeLayout.LayoutParams) {
RelativeLayout.LayoutParams rl_lp = new RelativeLayout.LayoutParams(vg_lp);
rl_lp.addRule(RelativeLayout.CENTER_IN_PARENT);
mView.setLayoutParams(rl_lp);
}
}
});
}
}