【Android 工具类】经常使用工具类（方法）大全

收集经常使用的工具类或者方法：

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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;
    }

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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);
        }
    }
}

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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<PackageInfo> 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();
        }
    }

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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!</string>

代码中使用

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

输出结果：Hello,Android！

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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;
    }

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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<String, String> getPhoneInfo(Context context) {
        Map<String, String> map = new HashMap<String, String>();
        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;
    }

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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);
        }
    }