Android 11.0 自定义按键实现锁屏

路径：
frameworks/base/packages/SystemUI/src/com/android/systemui/keyguard/KeyguardViewMediator.java
frameworks/base/services/core/java/com/android/server/policy/PhoneWindowManager.java

【思路】

• 1、在事件处理处，发送广播给KeyguardViewMediator
• 2、KeyguardViewMediator来实现锁屏

frameworks/base/services/core/java/com/android/server/policy/PhoneWindowManager.java

public int interceptKeyBeforeQueueing(KeyEvent event, int policyFlags) {
              //新增锁屏键
            case KeyEvent.KEYCODE_BREAK:
                Intent intent = new Intent("com.android.internal.policy.impl.PhoneWindowManager.DELAYED_KEYGUARD");
                intent.putExtra("BREAK","break");   //发送标识，因为我们要针对它做专门处理
                mContext.sendBroadcast(intent);
                break;
}

frameworks/base/packages/SystemUI/src/com/android/systemui/keyguard/KeyguardViewMediator.java

private final BroadcastReceiver mDelayedLockBroadcastReceiver = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {
                //根据PauseBreak键发起的广播请求由我们自己来处理
                if (intent.getStringExtra("BREAK").equals("break")){
                    doKeyguardLocked(null); //锁屏
                    return;
             ...
             }
    };