【Android 工具类】经常使用工具类（方法）大全-白红宇

【Android 工具类】经常使用工具类（方法）大全

阅读量：5878 次

发布时间：2019-06-19

本文共 7037 字，大约阅读时间需要 23 分钟。

收集经常使用的工具类或者方法：

1.获取手机分辨率

/**     * 获取手机分辨率     */    public static String getDisplayMetrix(Context context)    {        if (Constant.Screen.SCREEN_WIDTH == 0 || Constant.Screen.SCREEN_HEIGHT == 0)        {            if (context != null)            {                int width = 0;                int height = 0;                SharedPreferences DiaplayMetrixInfo = context.getSharedPreferences("display_metrix_info", 0);                if (context instanceof Activity)                {                    WindowManager windowManager = ((Activity)context).getWindowManager();                    Display display = windowManager.getDefaultDisplay();                    DisplayMetrics dm = new DisplayMetrics();                    display.getMetrics(dm);                    width = dm.widthPixels;                    height = dm.heightPixels;                    Editor editor = DiaplayMetrixInfo.edit();                    editor.putInt("width", width);                    editor.putInt("height", height);                    editor.commit();                }                else                {                    width = DiaplayMetrixInfo.getInt("width", 0);                    height = DiaplayMetrixInfo.getInt("height", 0);                }                Constant.Screen.SCREEN_WIDTH = width;                Constant.Screen.SCREEN_HEIGHT = height;            }        }        return Constant.Screen.SCREEN_WIDTH + "×" + Constant.Screen.SCREEN_HEIGHT;    }

2.关闭系统的软键盘

public class SoftKeyboardUtil {
          /**     * 关闭系统的软键盘     * @param activity     */    public static void dismissSoftKeyboard(Activity activity)    {        View view = activity.getWindow().peekDecorView();        if (view != null)        {            InputMethodManager inputmanger = (InputMethodManager)activity.getSystemService(Context.INPUT_METHOD_SERVICE);            inputmanger.hideSoftInputFromWindow(view.getWindowToken(), 0);        }    }}

3.检測某程序是否安装

/**     * 检測某程序是否安装     */    public static boolean isInstalledApp(Context context, String packageName)    {        Boolean flag = false;        try        {            PackageManager pm = context.getPackageManager();            List
      
        pkgs = pm.getInstalledPackages(PackageManager.GET_UNINSTALLED_PACKAGES);            for (PackageInfo pkg : pkgs)            {                // 当找到了名字和该包名同样的时候，返回                if ((pkg.packageName).equals(packageName))                {                    return flag = true;                }            }        }        catch (Exception e)        {            // TODO Auto-generated catch block            e.printStackTrace();        }        return flag;    }

4.安装APK文件

/**     * 安装.apk文件     *      * @param context     */    public void install(Context context, String fileName)    {        if (TextUtils.isEmpty(fileName) || context == null)        {            return;        }        try        {            Intent intent = new Intent(Intent.ACTION_VIEW);            intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);            intent.setAction(android.content.Intent.ACTION_VIEW);            intent.setDataAndType(Uri.fromFile(new File(fileName)), "application/vnd.android.package-archive");            context.startActivity(intent);        }        catch (Exception e)        {            e.printStackTrace();        }    }    /**     * 安装.apk文件     *      * @param context     */    public void install(Context context, File file)    {        try        {            Intent intent = new Intent(Intent.ACTION_VIEW);            intent.setDataAndType(Uri.fromFile(file), "application/vnd.android.package-archive");            context.startActivity(intent);        }        catch (Exception e)        {            e.printStackTrace();        }    }

5.dp—px相互转换

/**     * 依据手机的分辨率从 dp 的单位 转成为 px(像素)     *     * @return 返回像素值     */    public static int dp2px(Context context, float dpValue) {        final float scale = context.getResources().getDisplayMetrics().density;        return (int) (dpValue * scale + 0.5f);    }    /**     * 依据手机的分辨率从 px(像素) 的单位 转成为 dp     *     * @return 返回dp值     */    public static int px2dp(Context context, float pxValue) {        final float scale = context.getResources().getDisplayMetrics().density;        return (int) (pxValue / scale + 0.5f);    }

6. Strings.xml中“%s”的使用方式

在strings.xml中加入字符串

string name="text">Hello,%s!

代码中使用

textView.setText(String.format(getResources().getString(R.string.text),"Android"));

输出结果：Hello,Android！

7. 依据mac地址+deviceid获取设备唯一编码

private static String DEVICEKEY = "";    /**     * 依据mac地址+deviceid     * 获取设备唯一编码     * @return     */    public static String getDeviceKey()    {        if ("".equals(DEVICEKEY))        {            String macAddress = "";            WifiManager wifiMgr = (WifiManager)MainApplication.getIns().getSystemService(MainApplication.WIFI_SERVICE);            WifiInfo info = (null == wifiMgr ? null : wifiMgr.getConnectionInfo());            if (null != info)            {                macAddress = info.getMacAddress();            }            TelephonyManager telephonyManager =                (TelephonyManager)MainApplication.getIns().getSystemService(MainApplication.TELEPHONY_SERVICE);            String deviceId = telephonyManager.getDeviceId();            DEVICEKEY = MD5Util.toMD5("android" + Constant.APPKEY + Constant.APPPWD + macAddress + deviceId);        }        return DEVICEKEY;    }

8. 获取手机及SIM卡相关信息

/**     * 获取手机及SIM卡相关信息     * @param context     * @return     */    public static Map
      
        getPhoneInfo(Context context) {        Map
       
         map = new HashMap
        
         ();        TelephonyManager tm = (TelephonyManager) context                .getSystemService(Context.TELEPHONY_SERVICE);        String imei = tm.getDeviceId();        String imsi = tm.getSubscriberId();        String phoneMode = android.os.Build.MODEL;         String phoneSDk = android.os.Build.VERSION.RELEASE;        map.put("imei", imei);        map.put("imsi", imsi);        map.put("phoneMode", phoneMode+"##"+phoneSDk);        map.put("model", phoneMode);        map.put("sdk", phoneSDk);        return map;    }

9.按两次返回键后退出应用

@Override    public boolean onKeyDown(int keyCode, KeyEvent event)    {        if (keyCode == KeyEvent.KEYCODE_MENU)        {            return false;        }        // 按两次返回键后退出应用        if (AppTools.getFirstData(IndexActivity.this))        {            if (keyCode == KeyEvent.KEYCODE_BACK)            {                if (System.currentTimeMillis() - touchTime > 1500)                {                    Toast.makeText(IndexActivity.this, "再按一次退出应用", Toast.LENGTH_SHORT).show();                    touchTime = System.currentTimeMillis();                }                else                {                    ScreenManager.getScreenManager().popAllActivityExceptMain(IndexActivity.class);                    finish();                }            }            return true;        }        else        {            return super.onKeyDown(keyCode, event);        }    }

这里写图片描写叙述