1.做锁屏软件，锁屏软件具体界面的实现不说，在屏蔽通知栏下拉的时候就出现问题了。网上找了一些资料，可以通过statusbarmanager这个类来实现，由于这个类是系统隐藏的，所以我们很容易就想到使用反射，这个类的源码如下：
package android.app;import android.content.Context;import android.os.Binder;import android.os.RemoteException;import android.os.IBinder;import android.os.ServiceManager;public class StatusBarManager {public static final int DISABLE_EXPAND = 0x00000001;public static final int DISABLE_NOTIFICATION_ICONS = 0x00000002;public static final int DISABLE_NOTIFICATION_ALERTS = 0x00000004;public static final int DISABLE_NOTIFICATION_TICKER = 0x00000008;public static final int DISABLE_NONE = 0x00000000;private Context mContext;private IStatusBar mService;private IBinder mToken = new Binder();StatusBarManager(Context context) {mContext = context;mService = IStatusBar.Stub.asInterface(ServiceManager.getService(Context.STATUS_BAR_SERVICE));}public void disable(int what) {try {mService.disable(what, mToken, mContext.getPackageName());} catch (RemoteException ex) {// system process is dead anyway.throw new RuntimeException(ex);}}public void expand() {try {mService.activate();} catch (RemoteException ex) {// system process is dead anyway.throw new RuntimeException(ex);}}public void collapse() {try {mService.deactivate();} catch (RemoteException ex) {// system process is dead anyway.throw new RuntimeException(ex);}}public void toggle() {try {mService.toggle();} catch (RemoteException ex) {// system process is dead anyway.throw new RuntimeException(ex);}}public IBinder addIcon(String slot, int iconId, int iconLevel) {try {return mService.addIcon(slot, mContext.getPackageName(), iconId, iconLevel);} catch (RemoteException ex) {// system process is dead anyway.throw new RuntimeException(ex);}}public void updateIcon(IBinder key, String slot, int iconId, int iconLevel) {try {mService.updateIcon(key, slot, mContext.getPackageName(), iconId, iconLevel);} catch (RemoteException ex) {// system process is dead anyway.throw new RuntimeException(ex);}}public void removeIcon(IBinder key) {try {mService.removeIcon(key);} catch (RemoteException ex) {// system process is dead anyway.throw new RuntimeException(ex);}}}
2.如果是系统级应用，也就是手机厂家植入的应用，可以使用disable(int)的方法来进行屏蔽，参数如上源码五个参数之一即可。但是如果是在应用层上的，disable方法因为权限问题无法使用（如果一定要使用必须具有系统签名）。这个时候可以使用collapse()方法，现在的小米锁屏和360锁屏都是使用该方法，具体代码如下：
@Overridepublic void onWindowFocusChanged(boolean hasFocus) {disableStatusBar();super.onWindowFocusChanged(hasFocus);}public void disableStatusBar(){try {Object service = getSystemService("statusbar");Class<?> claz = Class.forName("android.app.StatusBarManager");Method expand = claz.getMethod("collapse");expand.invoke(service);} catch (Exception e) {e.printStackTrace();}}
3.
重写activity的onWindowfocuschanged方法，执行如上操作即可。以上方法使用了反射，如果不想使用使用反射获得隐藏的StatusBarManager，我这里提供一个jar包，将jar包导入到项目中，即可直接使用StatusBarManager ，还可以直接使用ServiceManager这个隐藏类，它有什么用？相信做过自动挂断电话的童鞋应该了解。
jar下载地址包：/detail/welen123456789/5068165
