Android 方法参数的限制

Android枚举方案

public void setNumber(@IntRange(from = 0, to = 100) int number) {

}

@IntDef({RED, GREEN})
@Retention(RetentionPolicy.SOURCE)
public @interface Color{}

private static final int RED = 1;
private static final int GREEN = 2;

public void setColor(@Color int color) {

}

获取View的截图

View viewRoot = getWindow().getDecorView().getRootView();
viewRoot.setDrawingCacheEnabled(true);
Bitmap screenShotAsBitmap = Bitmap.createBitmap(viewRoot.getDrawingCache());
viewRoot.setDrawingCacheEnabled(false);
// use screenShotAsBitmap as you need