Android获取设备信息

几乎所有的app都需要获得设备信息，下面来说说获取设备常见信息信息的方法

屏幕分辨率

Display display = getWindowManager().getDefaultDisplay();
Point size = new Point();
display.getSize(size);
int width = size.x;
int height = size.y;

或者：

DisplayMetrics metrics = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(metrics);
int width = metrics.widthPixels;
int height = metrics.heightPixels

上面的代码是要在能获取到Activity的情况下使用的，如果无法获取到Activity，则可以使用一下的代码：

WindowManager wm = (WindowManager)context.getSystemService(Context.WINDOW_SERVICE);
Display display = wm.getDefaultDisplay();
Point point = new Point();
display.getSize(point);
int width = point.x;
int height = point.y;

屏幕尺寸

DisplayMetrics dm = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(dm);
int width=dm.widthPixels;
int height=dm.heightPixels;
int dens=dm.densityDpi;
double wi=(double)width/(double)dens;
double hi=(double)height/(double)dens;
double x = Math.pow(wi,2);
double y = Math.pow(hi,2);
double screenInches = Math.sqrt(x+y);

同样，上面的代码需要在能获取到Activity。

获取app名称

public static String getAppName(Context context) {
    String appName = "";
    try {
        PackageManager packageManager = context.getPackageManager();
        ApplicationInfo applicationInfo = packageManager.getApplicationInfo(context.getPackageName(), 0);
        appName = (String) packageManager.getApplicationLabel(applicationInfo);
    } catch (PackageManager.NameNotFoundException e) {
        e.printStackTrace();
    }
    return appName;
}

获取设备厂商和设备名称信息

// 设备厂商
String brand = Build.BRAND;
// 设备名称
String model = Build.MODEL;

获取DeviceID，SIM和IMSI

TelephonyManager tm = (TelephonyManager) context.getSystemService(Context.TELEPHONY_SERVICE);
String deviceId = tm.getDeviceId();
String sim = tm.getSimSerialNumber();
String imsi = (TelephonyManager) getSystemService(Context.TELEPHONY_SERVICE).getSubscriberId()；

注意需要在AndroidManifest中添加权限

<uses-permission android:name="android.permission.READ_PHONE_STATE"/>

获取网络状态

public static String getAPNType(Context context) {
    //结果返回值
    String netType = "nono_connect";
    //获取手机所有连接管理对象
    ConnectivityManager manager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
    //获取NetworkInfo对象
    NetworkInfo networkInfo = manager.getActiveNetworkInfo();
    //NetworkInfo对象为空 则代表没有网络
    if (networkInfo == null) {
        return netType;
    }
    //否则 NetworkInfo对象不为空 则获取该networkInfo的类型
    int nType = networkInfo.getType();
    if (nType == ConnectivityManager.TYPE_WIFI) {
        //WIFI
        netType = "wifi";
    } else if (nType == ConnectivityManager.TYPE_MOBILE) {
        int nSubType = networkInfo.getSubtype();
        TelephonyManager telephonyManager = (TelephonyManager) context.getSystemService(Context.TELEPHONY_SERVICE);
        //4G
        if (nSubType == TelephonyManager.NETWORK_TYPE_LTE
                && !telephonyManager.isNetworkRoaming()) {
            netType = "4G";
        } else if (nSubType == TelephonyManager.NETWORK_TYPE_UMTS || nSubType == TelephonyManager.NETWORK_TYPE_HSDPA || nSubType == TelephonyManager.NETWORK_TYPE_EVDO_0 && !telephonyManager.isNetworkRoaming()) {
            netType = "3G";
        //2G 移动和联通的2G为GPRS或EGDE，电信的2G为CDMA
        } else if (nSubType == TelephonyManager.NETWORK_TYPE_GPRS || nSubType == TelephonyManager.NETWORK_TYPE_EDGE || nSubType == TelephonyManager.NETWORK_TYPE_CDMA && !telephonyManager.isNetworkRoaming()) {
            netType = "2G";
        } else {
            netType = "2G";
        }
    }
    return netType;
}

判断设备是否root

网上有很多判断方法，但有些会在界面上弹窗提示获取权限，下面介绍一种无需弹窗判断设备是否root的方法：

/** 判断手机是否root，不弹出root请求框<br/> */
    public static boolean isRoot() {
        String binPath = "/system/bin/su";
        String xBinPath = "/system/xbin/su";
        if (new File(binPath).exists() && isExecutable(binPath))
            return true;
        if (new File(xBinPath).exists() && isExecutable(xBinPath))
            return true;
        return false;
    }

    private static boolean isExecutable(String filePath) {
        Process p = null;
        try {
            p = Runtime.getRuntime().exec("ls -l " + filePath);
            // 获取返回内容
            BufferedReader in = new BufferedReader(new InputStreamReader(
                    p.getInputStream()));
            String str = in.readLine();
            if (str != null && str.length() >= 4) {
                char flag = str.charAt(3);
                if (flag == 's' || flag == 'x')
                    return true;
            }
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (p != null) {
                p.destroy();
            }
        }
        return false;
    }