Detailed Explanation of Android System Tool Class

In this paper, we share the specific code of Android system tool class for your reference. The specific contents are as follows

System tool class

public class systemUtil {

  // Hide ipad Bottom virtual key bar 
  @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);
  }

  // Soft keyboard does not pop up automatically 
  public static void softInputMode(Activity activity){
    activity.getWindow().setSoftInputMode(
        WindowManager.LayoutParams.SOFT_INPUT_ADJUST_RESIZE |
        WindowManager.LayoutParams.SOFT_INPUT_STATE_HIDDEN);
  }

  // Keep the screen always bright 
  public static void screenLightUp(Activity activity){
    activity.getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
  }

  // Get screen resolution 
  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;
  }

  // Get Android System version 
  public static String getSystemVersion() {
    return android.os.Build.VERSION.RELEASE;
  }

  // Get the equipment model 
  public static String getSystemModel() {
    return android.os.Build.MODEL;
  }

  // Get IMEI Identification number 
  // Required permissions  <uses-permission android:name="android.permission.READ_PHONE_STATE" />
  @SuppressLint("MissingPermission")
  public static String getIMEI(Activity activity) {
    //6.0 The above system dynamically adds permissions 
    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();
  }

  // Get the current language of the system 
  public static String getSystemLanguage() {
    return Locale.getDefault().getLanguage();
  }

  // Obtain equipment power 
  @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);
  }

  // Get the available memory size of the device (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);
  }

  // Gets the total amount of memory available on the device (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);
  }

  // Obtain SD Total amount of cards available 
  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);
  }

  // Obtain sd Available size of card 
  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);
   }

  // Restart the device 
  private void restartDevices() {
    String cmd = "su -c reboot";
    try {
      Runtime.getRuntime().exec(cmd);
    } catch (IOException e) {
      Log.i("restart"," Insufficient authority ");
    }
  }
}

System-related permissions

// Write to external storage 
android.permission.WRITE_EXTERNAL_STORAGE Allows writing to external storage 

// Read external storage 
android.permission.READ_EXTERNAL_STORAGE Allows reading of external storage 

// Read the system log 
android.permission.READ_LOGS Read the underlying logs of the system 

// Read the content of short message 
android.permission.READ_SMS Read the contents of the short message 

// Vibration 
android.permission.VIBRATE , permissible vibration 

// Restart the device 
android.permission.REBOOT Allow the program to restart the device 

// Install the application 
android.permission.INSTALL_PACKAGES Allow programs to install applications 

// Modify sound 
android.permission.MODIFY_AUDIO_SETTINGS Modify sound setting information 

// Recording 
android.permission.RECORD_AUDIO A microphone that records sound through a mobile phone or headset 

// Use a flash 
android.permission.FLASHLIGHT Allow access to the flash 

// Access the network 
android.permission.INTERNET Access a network connection, which may generate a GPRS Flow 

// Change wifi Status 
android.permission.CHANGE_WIFI_STATE , open wifi , change wifi Status 

// Get WiFi Status 
android.permission.ACCESS_WIFI_STATE Gets the current WiFi Access status and WLAN Hot spot information 

// Get network status 
android.permission.ACCESS_NETWORK_STATE Gets the status of network information, such as whether the current network connection is valid 

// Photographing authority 
android.permission.CAMERA Allow access to the camera to take pictures 

// Using Bluetooth 
android.permission.BLUETOOTH Allows programs to connect to paired Bluetooth devices 

// Battery status 
android.permission.BATTERY_STATS Permissions that allow applications to obtain battery status