1.介紹

Picasso是由Square公司開發的一個圖片載入框架

2.使用

如果你是用的是Android Studio，你只需要在dependency section中的build.gradle中新增 compile'com.squareup.picasso:picasso:2.3.3'

3.具體程式碼

xml中：

<ImageView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/imageView"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true" />
 

ImageView imageView = (ImageView) findViewById(R.id.imageView);
 
        Picasso.with(this)
                .load("https://cms-assets.tutsplus.com/uploads/users/21/posts/19431/featured_image/CodeFeature.jpg")
                .into(imageView);

4.更多例子

picasso還有更多的功能，下面的例子獲取圖片並改變它們的大小進行展示：

Picasso.with(this)
 .load(https://cms-assets.tutsplus.com/uploads/users/21/posts/19431/featured_image/CodeFeature.jpg)
 .resize(100, 100)
 .into(imageView)

Picasso.with(this)
    .load("https://cms-assets.tutsplus.com/uploads/users/21/posts/19431/featured_image/CodeFeature.jpg")
    .rotate(180)
    .into(imageView);
 

Picasso.with(this)
    .load(https://cms-assets.tutsplus.com/uploads/users/21/posts/19431/featured_image/CodeFeature.jpg)
    .placeholder(R.drawable.image_name)
    .into(imageView);

Picasso.with(this)
    .load(https://cms-assets.tutsplus.com/uploads/users/21/posts/19431/featured_image/CodeFeature.jpg)
    .error(R.drawable.image_name)
    .into(imageView);

Picasso.with(this)
    .load(https://cms-assets.tutsplus.com/uploads/users/21/posts/19431/featured_image/CodeFeature.jpg)
    .placeholder(R.drawable.image_name_default)
    .error(R.drawable.image_name_error)
    .into(imageView);