Great question! The Toast.makeText() approach you're seeing is a classic example of the Static Factory Method pattern—one of the most common creational design patterns in Java (and by extension, Android development).

Let's clear up the confusion first: while it doesn't use new directly in your code, the static factory method internally uses new to create the Toast instance. Here's a simplified look at what happens inside the Android framework's Toast class:

public static Toast makeText(Context context, CharSequence text, @Duration int duration) {
    // Create a new Toast instance under the hood
    Toast result = new Toast(context);
    
    // Configure the Toast with your provided text, duration, etc.
    LayoutInflater inflate = (LayoutInflater)
            context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    View v = inflate.inflate(com.android.internal.R.layout.transient_notification, null);
    TextView tv = (TextView)v.findViewById(com.android.internal.R.id.message);
    tv.setText(text);
    
    result.mNextView = v;
    result.mDuration = duration;
    
    // Return the fully configured Toast object
    return result;
}

Why use this instead of direct new Toast()? #

Static factory methods offer several advantages over direct instantiation:

• Descriptive naming: makeText() clearly tells you what the method does—it creates a Toast pre-configured with text. A raw new Toast() would require you to manually set up all the details afterward.
• Encapsulation of creation logic: The framework handles all the boilerplate (inflating the layout, setting up the text view, etc.) so you don't have to repeat it every time you want a Toast.
• Flexibility for future changes: If Android ever changes how Toast objects are created (e.g., reusing instances instead of making new ones), the makeText() method can be updated internally without breaking your code.

To wrap it up: This isn't a "new" type of instantiation—it's a wrapper around the standard new keyword that makes object creation cleaner and more user-friendly. The core instance still comes from new Toast(context); you just don't have to write that line yourself!

内容的提问来源于stack exchange，提问作者steve