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<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();

        }

    }

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！

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<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;

    }

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);

        }

    }