Android 8.1 系统锁屏显示流程整理

平台:
RK3399 + Android 8.1
1
源码跟踪:
系统启动时显示锁屏:
|-- frameworks/base/services/core/java/com/android/server/policy/PhoneWindowManager.java

KeyguardServiceDelegate mKeyguardDelegate;

/** {@inheritDoc} */
@Override
public void init(Context context, IWindowManager windowManager,
        WindowManagerFuncs windowManagerFuncs) {
	...
    mKeyguardDelegate = new KeyguardServiceDelegate(mContext,
            new StateCallback() {
                @Override
                public void onTrustedChanged() {
                    mWindowManagerFuncs.notifyKeyguardTrustedChanged();
                }
            });
}

/** {@inheritDoc} */
@Override
public void systemBooted() {
    bindKeyguard();
    ...
}
private void bindKeyguard() {
    synchronized (mLock) {
        if (mKeyguardBound) {
            return;
        }
        mKeyguardBound = true;
    }
    mKeyguardDelegate.bindService(mContext);
}


/** {@inheritDoc} */
@Override
public void systemReady() {//系统服务启动完成.
    // In normal flow, systemReady is called before other system services are ready.
    // So it is better not to bind keyguard here.
    mKeyguardDelegate.onSystemReady();
}
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所有的锁屏相关操作由mKeyguardDelegate 代理完成:
|-- frameworks/base/services/core/java/com/android/server/policy/keyguard/KeyguardServiceDelegate.java

public void bindService(Context context) {
Intent intent = new Intent();
final Resources resources = context.getApplicationContext().getResources();

   final ComponentName keyguardComponent = ComponentName.unflattenFromString(
           resources.getString(com.android.internal.R.string.config_keyguardComponent));
   intent.addFlags(Intent.FLAG_DEBUG_TRIAGED_MISSING);
   intent.setComponent(keyguardComponent);

   if (!context.bindServiceAsUser(intent, mKeyguardConnection,
           Context.BIND_AUTO_CREATE, mHandler, UserHandle.SYSTEM)) {
...
}
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}

private final ServiceConnection mKeyguardConnection = new ServiceConnection() {
   @Override
   public void onServiceConnected(ComponentName name, IBinder service) {
       if (DEBUG) Log.v(TAG, "*** Keyguard connected (yay!)");
       mKeyguardService = new KeyguardServiceWrapper(mContext,
               IKeyguardService.Stub.asInterface(service), mCallback);
}
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}

public void onS