Android P图形架构之虚拟屏实现

朱雀 2024-04-18 23:42 17阅读 0赞

Android P默认支持两个物理屏和一个虚拟屏显示。

物理屏两块分为：主屏和副屏。  
虚拟屏可以有多块。

mDisplayManager = getActivity().getSystemService(DisplayManager.class);
    mDisplayManager.registerDisplayListener(mDisplayListener, new Handler());
    
    //虚拟屏创建成功后会调用mDisplayListener，返回displayId
    private final DisplayListener mDisplayListener = new DisplayListener() { 
        @Override
        public void onDisplayAdded(int displayId) { 
            int navDisplayId = getVirtualDisplayId();
            Log.i(TAG, "onDisplayAdded, displayId: " + displayId + ", navigation display id: " + navDisplayId);
    
            if (navDisplayId == displayId) { 
                    mRegisteredNavDisplayId = displayId;
            }
        }
    
        @Override
        public void onDisplayRemoved(int displayId) { 
            if (mRegisteredNavDisplayId == displayId) { 
                    mRegisteredNavDisplayId = Display.INVALID_DISPLAY;
            }
        }
    
        @Override
        public void onDisplayChanged(int displayId) { }
    };
    
    private VirtualDisplay createVirtualDisplay(Surface surface, int width, int height) { 
        Log.i(TAG, "createVirtualDisplay, surface: " + surface + ", width: " + width
                + "x" + height);
        return mDisplayManager.createVirtualDisplay("Cluster-App-VD", width, height, 160, surface,
                DisplayManager.VIRTUAL_DISPLAY_FLAG_OWN_CONTENT_ONLY);
    }

调用createVirtualDisplay()，创建虚拟屏。

调式：

adb shell am start -n com.google.android.car.kitchensink/com.google.android.car.kitchensink.cluster.FakeClusterNavigationActivity --display 2
    adb shell am start -n com.android.car.carlauncher/com.android.car.carlauncher.CarLauncher --display 0
    adb shell am start -n com.android.settings/com.android.settings.Settings --display 3
    adb shell am start -n com.android.car.dialer/com.android.car.dialer.TelecomActivity --display 2

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