private Button btn;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
btn = (Button) this.findViewById(R.id.btn);
image = (ImageView) this.findViewById(R.id.iv);
btn.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
image.setBackgroundResource(R.drawable.xx);
}
});
}