恰好需要用到一点dialog，然后在google的android官网上看到建议使用DialogFragment，然后，按照他的demo做出来的效果并不是全屏。
如是查找api发现：setStyle是可以控制DialogFragment显示样式的。
但是这个api调用，必须是在onCreate方法里面，
/** * Call to customize the basic appearance and behavior of the * fragment's dialog.
This can be used for some common dialog behaviors, * taking care of selecting flags, theme, and other options for you.
The * same effect can be achieve by manually setting Dialog and Window * attributes yourself.
Calling this after the fragment's Dialog is * created will have no effect.
* * @param style Selects a standard style: may be {@link #STYLE_NORMAL},
* {@link #STYLE_NO_TITLE}, {@link #STYLE_NO_FRAME}, or * {@link #STYLE_NO_INPUT}.
* @param theme Optional custom theme. If 0, an appropriate theme (based * on the style) will be selected for you.
*/
public void setStyle(@DialogStyle int style, @StyleRes int theme) {
mStyle = style;
if (mStyle == STYLE_NO_FRAME || mStyle == STYLE_NO_INPUT) {
mTheme = android.R.style.Theme_Panel;
}
if (theme != 0) {
mTheme = theme;
}
}
全屏 ，连statusBar都消失掉
setStyle(DialogFragment.STYLE_NO_FRAME, android.R.style.Theme_Light_NoTitleBar_Fullscreen);
全屏 ，statusBar还在
setStyle(DialogFragment.STYLE_NO_FRAME, android.R.style.Theme_Holo_Light);
参数，第一个参数我是随便给的，因为根据api源码可以看到，如果第二个参数不为0，那么第一个参数是没有作用的，会覆盖，具体的样式还有很多，甚至可以自己定制都是没问题的。
