36个Android开发常用代码片段

常用代码片段
//36个Android开发常用代码片段//拨打电话public static void call(Context context, String phoneNumber) {     context.startActivity( new Intent(Intent.ACTION_CALL, Uri.parse( "tel:" + phoneNumber)));   }//跳转至拨号界面public static void callDial(Context context, String phoneNumber) {     context.startActivity( new Intent(Intent.ACTION_DIAL, Uri.parse( "tel:" + phoneNumber)));   }//发送短信public static void sendSms(Context context, String phoneNumber,       String content) {     Uri uri = Uri.parse( "smsto:"         + (TextUtils.isEmpty(phoneNumber) ? "" : phoneNumber));     Intent intent = new Intent(Intent.ACTION_SENDTO, uri);     intent.putExtra( "sms_body" , TextUtils.isEmpty(content) ? "" : content);     context.startActivity(intent);   }//唤醒屏幕并解锁public static void wakeUpAndUnlock(Context context){      KeyguardManager km= (KeyguardManager) context.getSystemService(Context.KEYGUARD_SERVICE);      KeyguardManager.KeyguardLock kl = km.newKeyguardLock( "unLock" );      //解锁      kl.disableKeyguard();      //获取电源管理器对象      PowerManager pm=(PowerManager) context.getSystemService(Context.POWER_SERVICE);      //获取PowerManager.WakeLock对象,后面的参数|表示同时传入两个值,最后的是LogCat里用的Tag      PowerManager.WakeLock wl = pm.newWakeLock(PowerManager.ACQUIRE_CAUSES_WAKEUP | PowerManager.SCREEN_DIM_WAKE_LOCK, "bright" );      //点亮屏幕      wl.acquire();      //释放      wl.release();    }//需要添加权限//判断当前App处于前台还是后台状态public static boolean isApplicationBackground( final Context context) {     ActivityManager am = (ActivityManager) context         .getSystemService(Context.ACTIVITY_SERVICE);     @SuppressWarnings ( "deprecation" )     List tasks = am.getRunningTasks( 1 );     if (!tasks.isEmpty()) {       ComponentName topActivity = tasks.get( 0 ).topActivity;       if (!topActivity.getPackageName().equals(context.getPackageName())) {         return true ;       }     }     return false ;   }//需要添加权限//判断当前手机是否处于锁屏(睡眠)状态public static boolean isSleeping(Context context) {     KeyguardManager kgMgr = (KeyguardManager) context         .getSystemService(Context.KEYGUARD_SERVICE);     boolean isSleeping = kgMgr.inKeyguardRestrictedInputMode();     return isSleeping;   }//判断当前是否有网络连接public static boolean isOnline(Context context) {     ConnectivityManager manager = (ConnectivityManager) context         .getSystemService(Activity.CONNECTIVITY_SERVICE);     NetworkInfo info = manager.getActiveNetworkInfo();     if (info != null && info.isConnected()) {       return true ;     }     return false ;   }//判断当前是否是WIFI连接状态public static boolean isWifiConnected(Context context) {   ConnectivityManager connectivityManager = (ConnectivityManager) context       .getSystemService(Context.CONNECTIVITY_SERVICE);   NetworkInfo wifiNetworkInfo = connectivityManager       .getNetworkInfo(ConnectivityManager.TYPE_WIFI);   if (wifiNetworkInfo.isConnected()) {     return true ;   }   return false ;}//安装APKpublic static void installApk(Context context, File file) {   Intent intent = new Intent();   intent.setAction( "android.intent.action.VIEW" );   intent.addCategory( "android.intent.category.DEFAULT" );   intent.setType( "application/vnd.android.package-archive" );   intent.setDataAndType(Uri.fromFile(file),       "application/vnd.android.package-archive" );   intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);   context.startActivity(intent);}//判断当前设备是否为手机public static boolean isPhone(Context context) {   TelephonyManager telephony = (TelephonyManager) context       .getSystemService(Context.TELEPHONY_SERVICE);   if (telephony.getPhoneType() == TelephonyManager.PHONE_TYPE_NONE) {     return false ;   } else {     return true ;   }}//获取当前设备宽高，单位px@SuppressWarnings ( "deprecation" )public static int getDeviceWidth(Context context) {   WindowManager manager = (WindowManager) context       .getSystemService(Context.WINDOW_SERVICE);   return manager.getDefaultDisplay().getWidth();}@SuppressWarnings ( "deprecation" )public static int getDeviceHeight(Context context) {   WindowManager manager = (WindowManager) context       .getSystemService(Context.WINDOW_SERVICE);   return manager.getDefaultDisplay().getHeight();}//获取当前设备的IMEI，需要与上面的isPhone()一起使用@TargetApi (Build.VERSION_CODES.CUPCAKE)public static String getDeviceIMEI(Context context) {   String deviceId;   if (isPhone(context)) {     TelephonyManager telephony = (TelephonyManager) context         .getSystemService(Context.TELEPHONY_SERVICE);     deviceId = telephony.getDeviceId();   } else {     deviceId = Settings.Secure.getString(context.getContentResolver(),         Settings.Secure.ANDROID_ID);   }   return deviceId;}//获取当前设备的MAC地址public static String getMacAddress(Context context) {   String macAddress;   WifiManager wifi = (WifiManager) context       .getSystemService(Context.WIFI_SERVICE);   WifiInfo info = wifi.getConnectionInfo();   macAddress = info.getMacAddress();   if ( null == macAddress) {     return "" ;   }   macAddress = macAddress.replace( ":" , "" );   return macAddress;}//获取当前程序的版本号public static String getAppVersion(Context context) {   String version = "0" ;   try {     version = context.getPackageManager().getPackageInfo(         context.getPackageName(), 0 ).versionName;   } catch (PackageManager.NameNotFoundException e) {     e.printStackTrace();   }   return version;}//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();   }//是否有SD卡public static boolean haveSDCard() {     return android.os.Environment.getExternalStorageState().equals(         android.os.Environment.MEDIA_MOUNTED);   }//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 );   }//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 );   }//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 );   }//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);   }//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;   }//获取状态栏高度＋标题栏(ActionBar)高度//(注意，如果没有ActionBar，那么获取的高度将和上面的是一样的，只有状态栏的高度)public static int getTopBarHeight(Activity activity) {     return activity.getWindow().findViewById(Window.ID_ANDROID_CONTENT)         .getTop();   }//获取MCC+MNC代码 (SIM卡运营商国家代码和运营商网络代码)//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();   }//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();   }//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:3public static int getPhoneType(Context context) {     TelephonyManager telephonyManager = (TelephonyManager) context         .getSystemService(Context.TELEPHONY_SERVICE);     return telephonyManager.getPhoneType();   }//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EVDOpublic 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;     }   }//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;   }//px-dp转换public static int dip2px(Context context, float dpValue) {   final float scale = context.getResources().getDisplayMetrics().density;   return ( int ) (dpValue * scale + 0 .5f);}public static int px2dip(Context context, float pxValue) {   final float scale = context.getResources().getDisplayMetrics().density;   return ( int ) (pxValue / scale + 0 .5f);}//px-sp转换public static int px2sp(Context context, float pxValue) {     final float fontScale = context.getResources().getDisplayMetrics().scaledDensity;     return ( int ) (pxValue / fontScale + 0 .5f);   }public static int sp2px(Context context, float spValue) {     final float fontScale = context.getResources().getDisplayMetrics().scaledDensity;     return ( int ) (spValue * fontScale + 0 .5f);   }//把一个毫秒数转化成时间字符串//格式为小时/分/秒/毫秒（如：24903600 –> 06小时55分03秒600毫秒）/**    * @param millis    *            要转化的毫秒数。    * @param isWhole    *            是否强制全部显示小时/分/秒/毫秒。    * @param isFormat    *            时间数字是否要格式化，如果true：少位数前面补全；如果false：少位数前面不补全。    * @return 返回时间字符串：小时/分/秒/毫秒的格式（如：24903600 --> 06小时55分03秒600毫秒）。    */   public static String millisToString( long millis, boolean isWhole,       boolean isFormat) {     String h = "" ;     String m = "" ;     String s = "" ;     String mi = "" ;     if (isWhole) {       h = isFormat ? "00小时" : "0小时" ;       m = isFormat ? "00分" : "0分" ;       s = isFormat ? "00秒" : "0秒" ;       mi = isFormat ? "00毫秒" : "0毫秒" ;     }     long temp = millis;     long hper = 60 * 60 * 1000 ;     long mper = 60 * 1000 ;     long sper = 1000 ;     if (temp / hper > 0 ) {       if (isFormat) {         h = temp / hper < 10 ? "0" + temp / hper : temp / hper + "" ;       } else {         h = temp / hper + "" ;       }       h += "小时" ;     }     temp = temp % hper;     if (temp / mper > 0 ) {       if (isFormat) {         m = temp / mper < 10 ? "0" + temp / mper : temp / mper + "" ;       } else {         m = temp / mper + "" ;       }       m += "分" ;     }     temp = temp % mper;     if (temp / sper > 0 ) {       if (isFormat) {         s = temp / sper < 10 ? "0" + temp / sper : temp / sper + "" ;       } else {         s = temp / sper + "" ;       }       s += "秒" ;     }     temp = temp % sper;     mi = temp + "" ;     if (isFormat) {       if (temp < 100 && temp >= 10 ) {         mi = "0" + temp;       }       if (temp < 10 ) {         mi = "00" + temp;       }     }     mi += "毫秒" ;     return h + m + s + mi;   }格式为小时/分/秒/毫秒（如：24903600 –> 06小时55分03秒）。/**    *    * @param millis    *            要转化的毫秒数。    * @param isWhole    *            是否强制全部显示小时/分/秒/毫秒。    * @param isFormat    *            时间数字是否要格式化，如果true：少位数前面补全；如果false：少位数前面不补全。    * @return 返回时间字符串：小时/分/秒/毫秒的格式（如：24903600 --> 06小时55分03秒）。    */   public static String millisToStringMiddle( long millis, boolean isWhole,       boolean isFormat) {     return millisToStringMiddle(millis, isWhole, isFormat, "小时" , "分钟" , "秒" );   }   public static String millisToStringMiddle( long millis, boolean isWhole,       boolean isFormat, String hUnit, String mUnit, String sUnit) {     String h = "" ;     String m = "" ;     String s = "" ;     if (isWhole) {       h = isFormat ? "00" + hUnit : "0" + hUnit;       m = isFormat ? "00" + mUnit : "0" + mUnit;       s = isFormat ? "00" + sUnit : "0" + sUnit;     }     long temp = millis;     long hper = 60 * 60 * 1000 ;     long mper = 60 * 1000 ;     long sper = 1000 ;     if (temp / hper > 0 ) {       if (isFormat) {         h = temp / hper < 10 ? "0" + temp / hper : temp / hper + "" ;       } else {         h = temp / hper + "" ;       }
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