Android：新手必备的常用代码片段整理(二)

1.收集设备信息，用于信息统计分析

public static Properties collectDeviceInfo(Context context) {        Properties mDeviceCrashInfo = new Properties();        try {            PackageManager pm = context.getPackageManager();            PackageInfo pi = pm.getPackageInfo(context.getPackageName(),                    PackageManager.GET_ACTIVITIES);            if (pi != null) {                mDeviceCrashInfo.put(VERSION_NAME,                        pi.versionName == null ? "not set" : pi.versionName);                mDeviceCrashInfo.put(VERSION_CODE, pi.versionCode);            }        } catch (PackageManager.NameNotFoundException e) {            Log.e(TAG, "Error while collect package info", e);        }        Field[] fields = Build.class.getDeclaredFields();        for (Field field : fields) {            try {                field.setAccessible(true);                mDeviceCrashInfo.put(field.getName(), field.get(null));            } catch (Exception e) {                Log.e(TAG, "Error while collect crash info", e);            }        }        return mDeviceCrashInfo;    }public static String collectDeviceInfoStr(Context context) {        Properties prop = collectDeviceInfo(context);        Set deviceInfos = prop.keySet();        StringBuilder deviceInfoStr = new StringBuilder("{\n");        for (Iterator iter = deviceInfos.iterator(); iter.hasNext();) {            Object item = iter.next();            deviceInfoStr.append("\t\t\t" + item + ":" + prop.get(item)                    + ", \n");        }        deviceInfoStr.append("}");        return deviceInfoStr.toString();    }

2.是否有SD卡

public static boolean haveSDCard() {        return android.os.Environment.getExternalStorageState().equals(                android.os.Environment.MEDIA_MOUNTED);    }

3.动态隐藏软键盘

@TargetApi(Build.VERSION_CODES.CUPCAKE)    public static void hideSoftInput(Activity activity) {        View view = activity.getWindow().peekDecorView();        if (view != null) {            InputMethodManager inputmanger = (InputMethodManager) activity                    .getSystemService(Context.INPUT_METHOD_SERVICE);            inputmanger.hideSoftInputFromWindow(view.getWindowToken(), 0);        }    }    @TargetApi(Build.VERSION_CODES.CUPCAKE)public static void hideSoftInput(Context context, EditText edit) {        edit.clearFocus();        InputMethodManager inputmanger = (InputMethodManager) context                .getSystemService(Context.INPUT_METHOD_SERVICE);        inputmanger.hideSoftInputFromWindow(edit.getWindowToken(), 0);    }

4.动态显示软键盘

@TargetApi(Build.VERSION_CODES.CUPCAKE)public static void showSoftInput(Context context, EditText edit) {        edit.setFocusable(true);        edit.setFocusableInTouchMode(true);        edit.requestFocus();        InputMethodManager inputManager = (InputMethodManager) context                .getSystemService(Context.INPUT_METHOD_SERVICE);        inputManager.showSoftInput(edit, 0);    }

5.动态显示或者是隐藏软键盘

TargetApi(Build.VERSION_CODES.CUPCAKE)public static void toggleSoftInput(Context context, EditText edit) {        edit.setFocusable(true);        edit.setFocusableInTouchMode(true);        edit.requestFocus();        InputMethodManager inputManager = (InputMethodManager) context                .getSystemService(Context.INPUT_METHOD_SERVICE);        inputManager.toggleSoftInput(InputMethodManager.SHOW_FORCED, 0);    }

6.主动回到Home，后台运行

public static void goHome(Context context) {        Intent mHomeIntent = new Intent(Intent.ACTION_MAIN);        mHomeIntent.addCategory(Intent.CATEGORY_HOME);        mHomeIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK                | Intent.FLAG_ACTIVITY_RESET_TASK_IF_NEEDED);        context.startActivity(mHomeIntent);    }

7.获取状态栏高度
注意，要在onWindowFocusChanged中调用，在onCreate中获取高度为0

@TargetApi(Build.VERSION_CODES.CUPCAKE)public static int getStatusBarHeight(Activity activity) {    Rect frame = new Rect();    activity.getWindow().getDecorView().getWindowVisibleDisplayFrame(frame);        return frame.top;    }

8.获取状态栏高度＋标题栏(ActionBar)高度
仅当用户已在网络注册时有效, CDMA 可能会无效（中国移动：46000 46002, 中国联通：46001,中国电信：46003）

public static String getNetworkOperator(Context context) {        TelephonyManager telephonyManager = (TelephonyManager) context                .getSystemService(Context.TELEPHONY_SERVICE);        return telephonyManager.getNetworkOperator();    }

10.返回移动网络运营商的名字
(例：中国联通、中国移动、中国电信) 仅当用户已在网络注册时有效, CDMA 可能会无效)

public static String getNetworkOperatorName(Context context) {        TelephonyManager telephonyManager = (TelephonyManager) context                .getSystemService(Context.TELEPHONY_SERVICE);        return telephonyManager.getNetworkOperatorName();    }

11.返回移动终端类型
PHONE_TYPE_NONE :0 手机制式未知
PHONE_TYPE_GSM :1 手机制式为GSM，移动和联通
PHONE_TYPE_CDMA :2 手机制式为CDMA，电信
PHONE_TYPE_SIP:3

public static int getPhoneType(Context context) {        TelephonyManager telephonyManager = (TelephonyManager) context                .getSystemService(Context.TELEPHONY_SERVICE);        return telephonyManager.getPhoneType();    }

12.判断手机连接的网络类型(2G,3G,4G)

联通的3G为UMTS或HSDPA，移动和联通的2G为GPRS或EGDE，电信的2G为CDMA，电信的3G为EVDO

public class Constants {    /**     * Unknown network class     */    public static final int NETWORK_CLASS_UNKNOWN = 0;    /**     * wifi net work     */    public static final int NETWORK_WIFI = 1;    /**     * "2G" networks     */    public static final int NETWORK_CLASS_2_G = 2;    /**     * "3G" networks     */    public static final int NETWORK_CLASS_3_G = 3;    /**     * "4G" networks     */    public static final int NETWORK_CLASS_4_G = 4;}public static int getNetWorkClass(Context context) {        TelephonyManager telephonyManager = (TelephonyManager) context                .getSystemService(Context.TELEPHONY_SERVICE);        switch (telephonyManager.getNetworkType()) {        case TelephonyManager.NETWORK_TYPE_GPRS:        case TelephonyManager.NETWORK_TYPE_EDGE:        case TelephonyManager.NETWORK_TYPE_CDMA:        case TelephonyManager.NETWORK_TYPE_1xRTT:        case TelephonyManager.NETWORK_TYPE_IDEN:            return Constants.NETWORK_CLASS_2_G;        case TelephonyManager.NETWORK_TYPE_UMTS:        case TelephonyManager.NETWORK_TYPE_EVDO_0:        case TelephonyManager.NETWORK_TYPE_EVDO_A:        case TelephonyManager.NETWORK_TYPE_HSDPA:        case TelephonyManager.NETWORK_TYPE_HSUPA:        case TelephonyManager.NETWORK_TYPE_HSPA:        case TelephonyManager.NETWORK_TYPE_EVDO_B:        case TelephonyManager.NETWORK_TYPE_EHRPD:        case TelephonyManager.NETWORK_TYPE_HSPAP:            return Constants.NETWORK_CLASS_3_G;        case TelephonyManager.NETWORK_TYPE_LTE:            return Constants.NETWORK_CLASS_4_G;        default:            return Constants.NETWORK_CLASS_UNKNOWN;        }    }

13.判断当前手机的网络类型(WIFI还是2,3,4G)

需要用到上面的方法:

public static int getNetWorkStatus(Context context) {        int netWorkType = Constants.NETWORK_CLASS_UNKNOWN;        ConnectivityManager connectivityManager = (ConnectivityManager) context                .getSystemService(Context.CONNECTIVITY_SERVICE);        NetworkInfo networkInfo = connectivityManager.getActiveNetworkInfo();        if (networkInfo != null && networkInfo.isConnected()) {            int type = networkInfo.getType();            if (type == ConnectivityManager.TYPE_WIFI) {                netWorkType = Constants.NETWORK_WIFI;            } else if (type == ConnectivityManager.TYPE_MOBILE) {                netWorkType = getNetWorkClass(context);            }        }        return netWorkType;    }

14.模仿小米沉浸试标题栏

public class ZoneShowActivity extends AppCompatActivity {    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_zone_show);  //透明状态栏        getWindow().addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);   //透明导航栏   getWindow().addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_NAVIGATION);

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