设置无标题&不显示状态栏

注意！写requestWindowFeature时要放在setContentView(R.layout.activity_main);前面

requestWindowFeature(Window.FEATURE_NO_TITLE);  
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//标题栏显示进度条requestWindowFeature(Window.FEATURE_PROGRESS);requestWindowFeature(Window.FEATURE_INDETERMINATE_PRORESS);setProgressBarVisibility(true);setProgressBarIndeterminate(true);
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在style文件中的style下加入

<item name="android:windowNoTitle">true</item> 
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不显示标题栏(在AndroidManifest.xml文件中设置)

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

android:theme="@android:style/Theme.NoTitleBar.Fullscreen"
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不显示状态栏： 
//去掉Activity上面的状态栏

       getWindow().setFlags(WindowManager.LayoutParams. FLAG_FULLSCREEN ,                        WindowManager.LayoutParams. FLAG_FULLSCREEN);   
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另一种方法（推荐）:

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