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public class MainActivity extends Activity {
ImageView img;
Button btn_last,btn_next;
private int[] imgs={
R.drawable.abc_ab_bottom_solid_dark_holo,
R.drawable.abc_ic_voice_search,
R.drawable.ic_launcher,
R.drawable.abc_textfield_search_default_holo_light,
};
int index=1;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btn_last=(Button)findViewById(R.id.btn_last);
btn_next=(Button)findViewById(R.id.btn_next);
img=(ImageView)findViewById(R.id.image);
btn_last.setOnClickListener(new mClick());
btn_next.setOnClickListener(new mClick());
}
class mClick implements OnClickListener
{
public void onClick(View v)
{
if(v==btn_last)
{
if(index>0&&index<imgs.length)
{
index--;
img.setImageResource(imgs[index]);
}else {index=imgs.length-1;}
}
if(v==btn_next)
{
if(index>0&&index<imgs.length-1)
{
index++;
img.setImageResource(imgs[index]);
}else {index=1;}
}
}
}
}
if(v==btn_last)
{
if(index>0&&index<imgs.length)
{
index--;
}else {
index=imgs.length - 1;
}
img.setImageResource(imgs[index]);
}
if(v==btn_next)
{
if(index>=0&&index<imgs.length-1)
{
index++;
}else {index=0;}
img.setImageResource(imgs[index]);
}