java - 如何检查设备上是否存在特定传感器？

Question

我正在开发一个使用传感器的 android 应用程序，我想知道检测设备是否具有特定传感器的最佳方法，比如接近传感器。

此外，是否有任何“过滤器”可以应用于清单，这样设备上没有接近传感器的用户将无法安装该应用程序？如果存在，此“过滤器”是否在 Google Play 上也有效，因此用户将无法看到该应用？

Answer 1

这很可能是您在以编程方式检查功能时正在寻找的内容

PackageManager PM= this.getPackageManager();
boolean gps = PM.hasSystemFeature(PackageManager.FEATURE_LOCATION_GPS);
boolean acc = PM.hasSystemFeature(PackageManager.FEATURE_SENSOR_ACCELEROMETER);

此链接说明了您可以采取哪些措施来过滤市场中的应用程序，具体请查看该部分

市场过滤器

Answer 2

检查特定传感器：

public String getSystemInfo(PackageManager pm/* activity.getPackageManager() */) {
    return ""
    + "\nSDK: " + Build.VERSION.SDK_INT
    + "\nMODEL: " + Build.MODEL
    + "\nBrand: " + Build.BRAND
    + "\nManufacture: " + Build.MANUFACTURER
    + "\nAndroid Version: " + Build.VERSION.RELEASE
    + "\nSen-Fingerprint: " + hasFP()

    + "\nSen-Light: " + hasSen(pm, PackageManager.FEATURE_SENSOR_LIGHT)
    + "\nSen-Compass: " + hasSen(pm, PackageManager.FEATURE_SENSOR_COMPASS)
    + "\nSen-Proximity: " + hasSen(pm, PackageManager.FEATURE_SENSOR_PROXIMITY)
    + "\nSen-ECG(API 21): " + hasSen(pm, PackageManager.FEATURE_SENSOR_HEART_RATE_ECG)
    + "\nSen-Temp(API 21): " + hasSen(pm, PackageManager.FEATURE_SENSOR_AMBIENT_TEMPERATURE)
    + "\nSen-Accelerometer: " + hasSen(pm, PackageManager.FEATURE_SENSOR_ACCELEROMETER)
    + "\nSen-Humidity(API 21): " + hasSen(pm, PackageManager.FEATURE_SENSOR_RELATIVE_HUMIDITY)
    + "\nSen-Gyroscope(API 9): " + hasSen(pm, PackageManager.FEATURE_SENSOR_GYROSCOPE)
    + "\nSen-Barometer(API 9): " + hasSen(pm, PackageManager.FEATURE_SENSOR_BAROMETER)
    + "\nSen-HeartRate(API 20): " + hasSen(pm, PackageManager.FEATURE_SENSOR_HEART_RATE)
    + "\nSen-StepCounter(API 19): " + hasSen(pm, PackageManager.FEATURE_SENSOR_STEP_COUNTER)
    + "\nSen-StepDetector(API 19): " + hasSen(pm, PackageManager.FEATURE_SENSOR_STEP_DETECTOR);
}

public boolean hasFP() {
    return (Build.FINGERPRINT != null && !Build.FINGERPRINT.equals(""));
}

public boolean hasSen(PackageManager packageManager, String sensor) {
    try {
        return packageManager.hasSystemFeature(sensor);
    } catch (Exception ignored) {
        return false;
    }
}