36个Android开发常用代码片段

之前博客中也有android帮助类的博客，但是都是统一描述一个帮助类的方法，本章主要是提取开发中常用的帮助方法，如果有想具体研究的可以参考之前的帮助类博客。

拨打电话

1 2 3 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

1 2 3 public static void callDial(Context context, String phoneNumber) { context.startActivity( new Intent(Intent.ACTION_DIAL, Uri.parse( "tel:" + phoneNumber))); }

发送短信

1 2 3 4 5 6 7 8 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

1 2 3 4 5 6 7 8 9 10 11 12 13 14 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

1 2	`<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

1 2 3 4 5 6 7 8 9 10 11 12 13 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

1 2	`<uses-permission` `android:name=` `"android.permission.GET_TASKS"` `/>`

判断当前手机是否处于锁屏(睡眠)状态

1 2 3 4 5 6 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

1 2 3 4 5 6 7 8 9 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

1 2 3 4 5 6 7 8 9 10 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

1 2 3 4 5 6 7 8 9 10 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

1 2 3 4 5 6 7 8 9 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

1 2 3 4 5 6 7 8 9 10 11 12 13 @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

1 2 3 4 5 6 7 8 9 10 11 12 13 14 @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

1 2 3 4 5 6 7 8 9 10 11 12 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

1 2 3 4 5 6 7 8 9 10 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

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 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

1 2 3 4 public static boolean haveSDCard() { return android.os.Environment.getExternalStorageState().equals( android.os.Environment.MEDIA_MOUNTED); }

动态隐藏软键盘

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 @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

1 2 3 4 5 6 7 8 9 @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

1 2 3 4 5 6 7 8 9 @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

1 2 3 4 5 6 7 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

1 2 3 4 5 6 @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)

1 2 3 4 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）

1 2 3 4 5 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)

1 2 3 4 5 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:3

1 2 3 4 5 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

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 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

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 public static int getNetWorkStatus(Context context) { int netWorkType = Constants.NETWORK_CLASS_UNKNOWN; ConnectivityManager connectivityManager = (ConnectivityManager) context .getSystemService(Context.CONNECTIVITY_SERVICE);

Android-常用代码-36片段