public class systemUtil {

  //隱藏ipad底部虛擬按鍵欄
  @RequiresApi(api = Build.VERSION_CODES.KITKAT)
  public static void closeBottomBar(Activity activity){
    Window _window = activity.getWindow();
    WindowManager.LayoutParams params = _window.getAttributes();
    params.systemUiVisibility =
        View.SYSTEM_UI_FLAG_HIDE_NAVIGATION|View.SYSTEM_UI_FLAG_IMMERSIVE;
    _window.setAttributes(params);
  }

  //不自動彈出軟鍵盤
  public static void softInputMode(Activity activity){
    activity.getWindow().setSoftInputMode(
        WindowManager.LayoutParams.SOFT_INPUT_ADJUST_RESIZE |
        WindowManager.LayoutParams.SOFT_INPUT_STATE_HIDDEN);
  }

  //保持屏幕常亮
  public static void screenLightUp(Activity activity){
    activity.getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
  }

  //獲取屏幕分辨率
  public static int[] defaultDisplay(Activity activity){
    int[] pixels = new int[2];
    DisplayMetrics dm = new DisplayMetrics();
    activity.getWindowManager().getDefaultDisplay().getMetrics(dm);
    pixels[0]=dm.widthPixels;
    pixels[1]=dm.heightPixels;
    return pixels;
  }

  //獲取Android系統(tǒng)版本
  public static String getSystemVersion() {
    return android.os.Build.VERSION.RELEASE;
  }

  //獲取設備機型
  public static String getSystemModel() {
    return android.os.Build.MODEL;
  }

  //獲取IMEI識別號
  //所需權限 <uses-permission android:name="android.permission.READ_PHONE_STATE" />
  @SuppressLint("MissingPermission")
  public static String getIMEI(Activity activity) {
    //6.0以上的系統(tǒng)動態(tài)添加權限
    if (ActivityCompat.checkSelfPermission(activity,
        Manifest.permission.READ_PHONE_STATE) != PackageManager.PERMISSION_GRANTED) {
      ActivityCompat.requestPermissions(activity,
        new String[]{Manifest.permission.READ_PHONE_STATE},1);
    }
    TelephonyManager tm =
        (TelephonyManager) activity.getSystemService(Activity.TELEPHONY_SERVICE);
    return tm.getDeviceId();
  }

  //獲取系統(tǒng)當前語言
  public static String getSystemLanguage() {
    return Locale.getDefault().getLanguage();
  }

  //獲取設備電量
  @TargetApi(Build.VERSION_CODES.LOLLIPOP)
  public static int getBattery(Context context){
    BatteryManager batteryManager =
        (BatteryManager)context.getSystemService(BATTERY_SERVICE);
    return batteryManager.getIntProperty(BatteryManager.BATTERY_PROPERTY_CAPACITY);
  }

  //獲取設備內(nèi)存可用大小(GB)
  public static String getRomAvailableSize(Context context) {
    File path = Environment.getDataDirectory();
    StatFs stat = new StatFs(path.getPath());
    long blockSize = stat.getBlockSize();
    long availableBlocks = stat.getAvailableBlocks();
    return Formatter.formatFileSize(context, blockSize * availableBlocks);
  }

  //獲取設備內(nèi)存可用的總量大小(GB)
  public static String getRomTotalSize(Context context) {
    File path = Environment.getDataDirectory();
    StatFs stat = new StatFs(path.getPath());
    long blockSize = stat.getBlockSize();
    long totalBlocks = stat.getBlockCount();
    return Formatter.formatFileSize(context, blockSize * totalBlocks);
  }

  //獲得SD卡可用總量大小
  public static String getSDTotalSize(Context context) {
    File path = Environment.getExternalStorageDirectory();
    StatFs stat = new StatFs(path.getPath());
    long blockSize = stat.getBlockSize();
    long totalBlocks = stat.getBlockCount();
    return Formatter.formatFileSize(context, blockSize * totalBlocks);
  }

  //獲得sd卡可用大小
  private String getSDAvailableSize(Context context) {
    File path = Environment.getExternalStorageDirectory();
    StatFs stat = new StatFs(path.getPath());
    long blockSize = stat.getBlockSize();
    long availableBlocks = stat.getAvailableBlocks();
    return Formatter.formatFileSize(context, blockSize * availableBlocks);
   }

  //重啟設備
  private void restartDevices() {
    String cmd = "su -c reboot";
    try {
      Runtime.getRuntime().exec(cmd);
    } catch (IOException e) {
      Log.i("restart","權限不足");
    }
  }
}

//寫入外部存儲
android.permission.WRITE_EXTERNAL_STORAGE，允許寫入外部存儲

//讀取外部存儲
android.permission.READ_EXTERNAL_STORAGE，允許讀取外部存儲

//讀取系統(tǒng)日志
android.permission.READ_LOGS，讀取系統(tǒng)底層日志

//讀取短信內(nèi)容
android.permission.READ_SMS，讀取短信內(nèi)容

//振動
android.permission.VIBRATE，允許振動

//重啟設備
android.permission.REBOOT，允許程序重新啟動設備

//安裝應用程序
android.permission.INSTALL_PACKAGES，允許程序安裝應用

//修改聲音
android.permission.MODIFY_AUDIO_SETTINGS，修改聲音設置信息

//錄音
android.permission.RECORD_AUDIO，錄制聲音通過手機或耳機的麥克

//使用閃光燈
android.permission.FLASHLIGHT，允許訪問閃光燈

//訪問網(wǎng)絡
android.permission.INTERNET，訪問網(wǎng)絡連接，可能產(chǎn)生GPRS流量

//改變wifi狀態(tài)
android.permission.CHANGE_WIFI_STATE，打開wifi，改變wifi狀態(tài)

//獲取WiFi狀態(tài)
android.permission.ACCESS_WIFI_STATE，獲取當前WiFi接入的狀態(tài)以及WLAN熱點的信息

//獲取網(wǎng)絡狀態(tài)
android.permission.ACCESS_NETWORK_STATE，獲取網(wǎng)絡信息狀態(tài)，如當前的網(wǎng)絡連接是否有效

//拍照權限
android.permission.CAMERA，允許訪問攝像頭進行拍照

//使用藍牙
android.permission.BLUETOOTH，允許程序連接配對過的藍牙設備

//電池狀態(tài)
android.permission.BATTERY_STATS，允許應用程序獲取電池狀態(tài)的權限