自定义锁屏实现原理：
1.监听系统SCREEN_ON与SCREEN_OFF广播
2.屏幕变暗，启动自定义锁屏页面，使其置顶
3.屏幕点亮，屏蔽系统锁屏，自定义锁屏页面即会出现
技术点：
1.监听广播只能使用动态，所以需使用后台sevice 保持监听长期有效
注意service保活（JobService等技术）
注意开关机问题（监听开机广播，启动后台service）
2.自定义锁屏
推荐使用WindowManager.addView方式
使用activity 注意屏蔽菜单键
3.监听系统消息推送（展示QQ 、微信 等应用推送消息，如不需要可忽略）
1)4.3以上版本使用 NotificationListenerService
继承并实现onNotificationPost 、onNotifitionRemoved
需要用户授权
startActivity(new Intent(Settings.ACTION_NOTIFICATION_LISTENER_SETTINGS))
2)4.3一下版本使用 AccessibilityService
关键代码
1.屏蔽系统锁屏
传统方案：
KeyguardManager keyguardManager = (KeyguardManager)context.getSystemService(Context.KEYGUARD_SERVICE);KeyguardManager.KeyguardLock lock = keyguardManager.newKeyguardLock("");lock.disableKeyguard();
最新方案：在自定义锁屏页面添加如下代码
getWindow().addFlags(WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED);getWindow().addFlags(WindowManager.LayoutParams.FLAG_DISMISS_KEYGUARD);
权限添加：
<uses-permission android:name="android.permission.DISABLE_KEYGUARD" />
2.广播注册
public class LockerService extends Service {private ScreenOnReceiver screenOnReceiver; private ScreenOffReceiver screenOffReceiver; @Override public void onCreate() {super.onCreate(); //只能动态注册 screenOnReceiver = new ScreenOnReceiver(); IntentFilter screenOnFilter = new IntentFilter(); screenOnFilter.addAction("android.intent.action.SCREEN_ON"); registerReceiver(screenOnReceiver, screenOnFilter); screenOffReceiver = new ScreenOffReceiver(); IntentFilter screenOffFilter = new IntentFilter(); screenOffFilter.addAction("android.intent.action.SCREEN_OFF"); registerReceiver(screenOffReceiver, screenOffFilter); }@Override public int onStartCommand(Intent intent, int flags, int startId) {return Service.START_STICKY; }/** * 监听屏幕变亮的广播接收器，变亮就屏蔽系统锁屏 * *@author*/ private class ScreenOnReceiver extends BroadcastReceiver {@Override public void onReceive(Context context, Intent intent) {String action = intent.getAction(); if (action.equals("android.intent.action.SCREEN_ON")) {/* * 此方式已经过时，在activtiy中编写 * getWindow().addFlags(WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED); * getWindow().addFlags(WindowManager.LayoutParams.FLAG_DISMISS_KEYGUARD); * 两句可以代替此方式 *///KeyguardManager keyguardManager = (KeyguardManager)context.getSystemService(Context.KEYGUARD_SERVICE);//KeyguardManager.KeyguardLock lock = keyguardManager.newKeyguardLock("");//lock.disableKeyguard(); }}}/** * 监听屏幕变暗的广播接收器，变暗就启动应用锁屏界面activity * *@author*/ private class ScreenOffReceiver extends BroadcastReceiver {@Override public void onReceive(Context context, Intent intent) {String action = intent.getAction(); if (action.equals("android.intent.action.SCREEN_OFF")) {Intent i1 = new Intent(context, LockerActivity.class);i1.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);startActivity(i1); }}}@Override public void onDestroy() {super.onDestroy(); unregisterReceiver(screenOnReceiver); unregisterReceiver(screenOffReceiver); }@Override public IBinder onBind(Intent intent) {return null; }}
3.自定义锁屏
public class LockerHelper {private Context mContext; private WindowManager mWindowManager;// 窗口管理器 private View mLockView;// 锁屏视图 private WindowManager.LayoutParams wmParams; private static LockerHelpermLockerHelper; private boolean isLocked;// 是否锁定 public static synchronized LockerHelper getInstance(Context mContext) {if (mLockerHelper== null) {mLockerHelper= new LockerHelper(mContext); }returnmLockerHelper; }/** * 构造方法 *@parammContext */ public LockerHelper(Context mContext) {this.mContext = mContext; init(); }/** * 初始化布局 */ private void init() {isLocked = false; // 获取WindowManager mWindowManager = (WindowManager) mContext.getApplicationContext().getSystemService(Context.WINDOW_SERVICE); // 设置LayoutParams(全局变量）相关参数 wmParams = new WindowManager.LayoutParams(); boolean isHide= (boolean) SPUtils.get(mContext, Constant.SWITCH_NOTIFICATION,false); wmParams.type = isHide?WindowManager.LayoutParams.TYPE_SYSTEM_ERROR:WindowManager.LayoutParams.TYPE_SYSTEM_ALERT;// 关键部分 wmParams.format = PixelFormat.RGBA_8888; // 设置图片格式，效果为背景透明 // 设置Window flag wmParams.width = WindowManager.LayoutParams.MATCH_PARENT; wmParams.height = WindowManager.LayoutParams.MATCH_PARENT; wmParams.flags = 1280; }/** * 锁屏 */ public synchronized void lock() {if (mLockView != null && !isLocked) {mWindowManager.addView(mLockView, wmParams); }isLocked = true; }/** * 解锁 */ public synchronized void unlock() {if (mWindowManager != null && isLocked) {mWindowManager.removeView(mLockView); }isLocked = false; }/** * 更新 */ public synchronized void update() {if (mLockView != null && !isLocked) {mWindowManager.updateViewLayout(mLockView, wmParams); }}/** * 设置锁屏视图 *@paramv */ public synchronized void setLockView(View v) {mLockView = v; }}
