Class Dimension for java on android

问题

What is the equivalent form of class java.awt.Dimension for android?

回答1:

You can choose one of these options:

android.util.Size (since API 21). It has getWidth() and getHeight() but it's immutable, meaning once it's created you can't modify it.
android.graphics.Rect. It has getWidth() and getHeight() but they're based on internal left, top, right, bottom and may seem bloated with all its extra variables and utility methods.
android.graphics.Point which is a plain container, but the name is not right and it's main members are called x and y which isn't ideal for sizing. However, this seems to be the class to use/abuse when getting display width and height from the Android framework itself as seen here:
```
Display display = getWindowManager().getDefaultDisplay();
Point size = new Point();
display.getSize(size);
int width = size.x;
int height = size.y;
```

回答2:

You could use Pair<Integer, Integer> which is Android's generic tuple class. (You would need to replace getWidth() and getHeight() with first and second, though.) In other places of the Android API the Android team seems to use ad-hoc classes for this purpose, for instance Camera.Size.

回答3:

Why do you need to abuse other classes instead of implementing something extremely simple like:

public class Dimensions {

    public int width;
    public int height;

    public Dimensions() {}

    public Dimensions(int w, int h) {
        width = w;
        height = h;
    }

    public Dimensions(Dimensions p) {
        this.width = p.width;
        this.height = p.height;
    }

    public final void set(int w, int h) {
        width = w;
        height = h;
    }

    public final void set(Dimensions d) {
        this.width = d.width;
        this.height = d.height;
    }

    public final boolean equals(int w, int h) {
        return this.width == w && this.height == h;
    }

    public final boolean equals(Object o) {
        return o instanceof Dimensions && (o == this || equals(((Dimensions)o).width, ((Dimensions)o).height));
    }

}

来源：https://stackoverflow.com/questions/8876130/class-dimension-for-java-on-android

标签

java

android

dimensions