Java 使用毕加索重新加载图像

我正在使用毕加索将url图像加载到我的图像视图。图像将在同一url内更改，因此添加了刷新按钮以重新加载新图像。有什么帮助吗

 protected void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main2);


}
@Override
public void onResume() {
    super.onResume();  // Always call the superclass method first
    ImageView v = (ImageView) findViewById(R.id.iv3);
    Picasso.with(this).load("http://xxxxx/cgi-bin/video.JPG").into(v);

}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
    // Handle action bar item clicks here. The action bar will
    // automatically handle clicks on the Home/Up button, so long
    // as you specify a parent activity in AndroidManifest.xml.
    int id = item.getItemId();

    //noinspection SimplifiableIfStatement
    if (id == R.id.action_settings) {
        return true;
    }
   else if(id==R.id.refresh){
   onResume();
    }
    return super.onOptionsItemSelected(item);
}

---

}

我添加了这一行，现在运行良好

Picasso.with（this）.invalidate（）