var hiddenProperty = 'hidden' in document ? 'hidden' : 'webkitHidden' in document ? 'webkitHidden' : 'mozHidden' in document ? 'mozHidden' : null ; var visibilityChangeEvent = hiddenProperty.replace( /hidden/ i, 'visibilitychange' ); var onVisibility
android 如何监听返回键点击事件,并创建一个退出对话框, 防止自己写的应用程序不小心点击退出键而直接退出.自己记录下这个简单的demo,备用. public class BackKeyTest extends Activity { /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedI
/** * Home 键监听,当按下Home键时,系统会发出action为Intent.ACTION_CLOSE_SYSTEM_DIALOGS的BroadcastReceiver * 在程序里动态注册监听,即可达到监听Home键的效果 */public class InnerReceiver extends BroadcastReceiver { final String SYSTEM_DIALOG_REASON_KEY = "reason"; final String SYST