设置全屏

去标题

requestWindowFeature(Window.FEATURE_NO_TITLE);
去状态栏
getWindow().addFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,WindowManager.LayoutParams.FLAG_FULLSCREEN);

或者

getWindow().addFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN);

.通过主题实现隐藏状态栏和标题栏

android:theme="@android:style/Theme.NoTitleBar.Fullscreen"

<application android:icon="@drawable/icon"
          android:label="@string/app_name"
          android:theme="@android:style/Theme.NoTitleBar.Fullscreen">