Android 系统工具类

public class systemUtil {

    //隐藏ipad底部虚拟按键栏
    @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);
    }

    //不自动弹出软键盘
    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);
    }

    //获取屏幕分辨率
    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;
    }

    //获取Android系统版本
    public static String getSystemVersion() {
        return android.os.Build.VERSION.RELEASE;
    }

    //获取设备机型
    public static String getSystemModel() {
        return android.os.Build.MODEL;
    }

    //获取IMEI识别号
    //所需权限 <uses-permission android:name="android.permission.READ_PHONE_STATE" />
    @SuppressLint("MissingPermission")
    public static String getIMEI(Activity activity) {
        //6.0以上的系统动态添加权限
        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();
    }

    //获取系统当前语言
    public static String getSystemLanguage() {
        return Locale.getDefault().getLanguage();
    }

    //获取设备电量
    @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);
    }

    //获取设备内存可用大小(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);
    }

    //获取设备内存可用的总量大小(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);
    }

    //获得SD卡可用总量大小
    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);
    }

    //获得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);
     }

    //重启设备
    private void restartDevices() {
        String cmd = "su -c reboot";
        try {
            Runtime.getRuntime().exec(cmd);
        } catch (IOException e) {
            Log.i("restart","权限不足");
        }
    }
}

 Android常用权限

//写入外部存储
android.permission.WRITE_EXTERNAL_STORAGE，允许写入外部存储

//读取外部存储
android.permission.READ_EXTERNAL_STORAGE，允许读取外部存储

//读取系统日志
android.permission.READ_LOGS，读取系统底层日志

//读取短信内容
android.permission.READ_SMS，读取短信内容

//振动
android.permission.VIBRATE，允许振动

//重启设备
android.permission.REBOOT，允许程序重新启动设备

//安装应用程序
android.permission.INSTALL_PACKAGES，允许程序安装应用

//修改声音
android.permission.MODIFY_AUDIO_SETTINGS，修改声音设置信息

//录音
android.permission.RECORD_AUDIO，录制声音通过手机或耳机的麦克

//使用闪光灯
android.permission.FLASHLIGHT，允许访问闪光灯

//访问网络
android.permission.INTERNET，访问网络连接，可能产生GPRS流量

//改变wifi状态
android.permission.CHANGE_WIFI_STATE，打开wifi，改变wifi状态

//获取WiFi状态
android.permission.ACCESS_WIFI_STATE，获取当前WiFi接入的状态以及WLAN热点的信息

//获取网络状态
android.permission.ACCESS_NETWORK_STATE，获取网络信息状态，如当前的网络连接是否有效

//拍照权限
android.permission.CAMERA，允许访问摄像头进行拍照

//使用蓝牙
android.permission.BLUETOOTH，允许程序连接配对过的蓝牙设备

//电池状态
android.permission.BATTERY_STATS，允许应用程序获取电池状态的权限