去除Android活动中的标题和信息栏

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.activity_main);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, 
       WindowManager.LayoutParams.FLAG_FULLSCREEN);
}

注：需要在AndroidManifest.xml文件声明去除信息栏的声明。

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

......

</activity>