Android 系統工具類

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);
    }

    //獲取屏幕解析度
    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
    //所需許可權 <uses-permission android:name="android.permission.READ_PHONE_STATE" />
    @SuppressLint("MissingPermission")
    public static String getIMEI(Activity activity) {
        //6.0以上的系統動態添加許可權
        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);
    }

    //獲取設備記憶體可用大小(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);
    }

    //獲取設備記憶體可用的總量大小(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","許可權不足");
        }
    }
}

 Android常用許可權

//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

//讀取系統日誌
android.permission.READ_LOGS，讀取系統底層日誌

//讀取簡訊內容
android.permission.READ_SMS，讀取簡訊內容

//振動
android.permission.VIBRATE，允許振動

//重啟設備
android.permission.REBOOT，允許程式重新啟動設備

//安裝應用程式
android.permission.INSTALL_PACKAGES，允許程式安裝應用

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

//錄音
android.permission.RECORD_AUDIO，錄製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

//訪問網路
android.permission.INTERNET，訪問網路連接，可能產生GPRS流量

//改變wifi狀態
android.permission.CHANGE_WIFI_STATE，打開wifi，改變wifi狀態

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

//獲取網路狀態
android.permission.ACCESS_NETWORK_STATE，獲取網路信息狀態，如當前的網路連接是否有效

//拍照許可權
android.permission.CAMERA，允許訪問攝像頭進行拍照

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

//電池狀態
android.permission.BATTERY_STATS，允許應用程式獲取電池狀態的許可權