android 8.1 disable unsupported sensor

如果device不支持某种sensor,可以在android/frameworks/base/core/java/android/hardware/SystemSensorManager.java里将其disabled掉。以disable proximity sensor为例。

public SystemSensorManager(Context context, Looper mainLooper) {
        synchronized(sLock) {
            if (!sNativeClassInited) {
                sNativeClassInited = true;
                nativeClassInit();
            }
        }
 
        mMainLooper = mainLooper;
        mTargetSdkLevel = context.getApplicationInfo().targetSdkVersion;
        mContext = context;
        mNativeInstance = nativeCreate(context.getOpPackageName());
 
        // initialize the sensor list
        for (int index = 0;;++index) {
            Sensor sensor = new Sensor();
            if (!nativeGetSensorAtIndex(mNativeInstance, sensor, index)) break; 
            //disable p_sensor solution: Remove proximity sensor from sensor list.
            if ((sensor != null) && sensor.getType() == Sensor.TYPE_PROXIMITY){
                Log.i(TAG,"skip proximity sensor");
                continue;
            }
            mFullSensorsList.add(sensor);
            mHandleToSensor.put(sensor.getHandle(), sensor);
        }
    }

就是将p_sensor 从mFullSensorsList中移出。这一步基本上已经work了(SensorManager#getSensorList(8)得不到p_sensor的讯息)，但是如果你的code还需要通过CTS测试，那么最好在android/frameworks/base/services/core/java/com/android/server/pm/PackageManagerService.java的hasSystemFeature方法里做remove proximity sensor feature

public boolean hasSystemFeature(String name, int version) {
        // allow instant applications
        synchronized (mAvailableFeatures) {
            final FeatureInfo feat = mAvailableFeatures.get(name);
            if (feat == null) {
                return false;
            } else {
                
                    //remove proximity sensor feature
                    if(name.equals("android.hardware.sensor.proximity")){
                        Log.w(TAG, "skip standard  proximity sensor");
                        return false;
                      }
                
                return feat.version >= version;
            }
        }
    }

这样一来PackageManager#hasSystemFeature(android.hardware.sensor.proximity) return false。

可用命令adb shell pm list features来检查device都support 那些功能。

或者尝试删除frameworks\native\data\etc下相关的配置文件