public boolean requestFeature (int featureId) Since: API Level 1 Enable extended screen features. This must be called before setContentView(). May be called as many times as desired as long as it is before setContentView(). If not called, no extended features will be available. You can not turn off a feature once it is requested. You canot use other title features with FEATURE_CUSTOM_TITLE.官方文档, 注意倒数第二句话. 也就是说一旦设置好就不能改变. 除非你重新创建. 所以...谢谢...
Since: API Level 1
Enable extended screen features. This must be called before setContentView(). May be called as many times as desired as long as it is before setContentView(). If not called, no extended features will be available. You can not turn off a feature once it is requested. You canot use other title features with FEATURE_CUSTOM_TITLE.官方文档, 注意倒数第二句话. 也就是说一旦设置好就不能改变. 除非你重新创建.
所以...谢谢...