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

&lt;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APK

public 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

  1. PHONE_TYPE_NONE :0 手机制式未知
  2. PHONE_TYPE_GSM :1 手机制式为GSM,移动和联通
  3. PHONE_TYPE_CDMA :2 手机制式为CDMA,电信
  4. PHONE_TYPE_SIP:3

public 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;

     }

   }

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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简单判断手机APP是否是初次安装详解
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