36个Android开发常用经典代码大全

//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<uses-permission android:name= "android.permission.WAKE_LOCK" /><uses-permission android:name= "android.permission.DISABLE_KEYGUARD" />//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<ActivityManager.RunningTaskInfo> 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<uses-permission  android:name= "android.permission.GET_TASKS" />//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 + "" ;    }