简单的毕加索呼叫不起作用

Question

我正在尝试在我的应用程序中使用Picasso并运行下面的简单实验：

public class MainActivity extends Activity {

    public static final String TAG = MainActivity.class.getSimpleName();//prints name of class without package name

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        ImageView image1 = (ImageView) findViewById(R.id.imageView);
        ImageView image2 = (ImageView) findViewById(R.id.imageView2);
        ImageView image3 = (ImageView) findViewById(R.id.imageView3);
        ImageView image4 = (ImageView) findViewById(R.id.imageView4);
        ImageView image5 = (ImageView) findViewById(R.id.imageView5);
        ImageView image6 = (ImageView) findViewById(R.id.imageView6);
        ImageView image7 = (ImageView) findViewById(R.id.imageView7);
        ImageView image8 = (ImageView) findViewById(R.id.imageView8);
        ImageView image9 = (ImageView) findViewById(R.id.imageView9);
        ImageView image10 = (ImageView) findViewById(R.id.imageView10);

        swap(image1);
    }

    public void swap(ImageView image){
        Picasso.with(MainActivity.this)
                .load("") // IMAGE URL HERE
                .skipMemoryCache()
                .fit()
                .into(image);
    }


    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_main, menu);
        return true;
    }

    @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;
        }

        return super.onOptionsItemSelected(item);
    }
}

我的布局中有7个图像视图，我只是想看看我是否可以使用毕加索从7个不同的网址中填充所有7个图片。在上面的脚本中，我试图让毕加索替换其中一个图像视图，但它不会这样做。该应用程序显示7个初始图像视图，但不会将它们换成URL中的图像。令人惊讶的是，没有控制台消息。