新手必备的常用 Android 代码片段整理（2）
jadr8110
8年前
以下内容来自多个开源项目的整理和自己的项目积累
1.收集设备信息，用于信息统计分析
Java
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(); }public static PropertiescollectDeviceInfo(Contextcontext) { PropertiesmDeviceCrashInfo = new Properties(); try { PackageManagerpm = context.getPackageManager(); PackageInfopi = 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 (Fieldfield : 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(Contextcontext) { Propertiesprop = collectDeviceInfo(context); SetdeviceInfos = prop.keySet(); StringBuilderdeviceInfoStr = new StringBuilder("{\n"); for (Iteratoriter = deviceInfos.iterator(); iter.hasNext();) { Object item = iter.next(); deviceInfoStr.append("\t\t\t" + item + ":" + prop.get(item) + ", \n"); } deviceInfoStr.append("}"); return deviceInfoStr.toString(); }</div> 2.是否有SD卡
Java
public static boolean haveSDCard() { return android.os.Environment.getExternalStorageState().equals( android.os.Environment.MEDIA_MOUNTED); }public static boolean haveSDCard() { return android.os.Environment.getExternalStorageState().equals( android.os.Environment.MEDIA_MOUNTED); }</div> 3.动态隐藏软键盘
Java
@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); }@TargetApi(Build.VERSION_CODES.CUPCAKE) public static void hideSoftInput(Activityactivity) { Viewview = activity.getWindow().peekDecorView(); if (view != null) { InputMethodManagerinputmanger = (InputMethodManager) activity .getSystemService(Context.INPUT_METHOD_SERVICE); inputmanger.hideSoftInputFromWindow(view.getWindowToken(), 0); } } @TargetApi(Build.VERSION_CODES.CUPCAKE) public static void hideSoftInput(Contextcontext, EditTextedit) { edit.clearFocus(); InputMethodManagerinputmanger = (InputMethodManager) context .getSystemService(Context.INPUT_METHOD_SERVICE); inputmanger.hideSoftInputFromWindow(edit.getWindowToken(), 0); }</div> 4.动态显示软键盘
Java
@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); }@TargetApi(Build.VERSION_CODES.CUPCAKE) public static void showSoftInput(Contextcontext, EditTextedit) { edit.setFocusable(true); edit.setFocusableInTouchMode(true); edit.requestFocus(); InputMethodManagerinputManager = (InputMethodManager) context .getSystemService(Context.INPUT_METHOD_SERVICE); inputManager.showSoftInput(edit, 0); }</div> 5.动态显示或者是隐藏软键盘
Java
@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); }@TargetApi(Build.VERSION_CODES.CUPCAKE) public static void toggleSoftInput(Contextcontext, EditTextedit) { edit.setFocusable(true); edit.setFocusableInTouchMode(true); edit.requestFocus(); InputMethodManagerinputManager = (InputMethodManager) context .getSystemService(Context.INPUT_METHOD_SERVICE); inputManager.toggleSoftInput(InputMethodManager.SHOW_FORCED, 0); }</div> 6.主动回到Home，后台运行
Java
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); }public static void goHome(Contextcontext) { IntentmHomeIntent = 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); }</div> 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
Java
@TargetApi(Build.VERSION_CODES.CUPCAKE) public static int getStatusBarHeight(Activity activity) { Rect frame = new Rect(); activity.getWindow().getDecorView().getWindowVisibleDisplayFrame(frame); return frame.top; }@TargetApi(Build.VERSION_CODES.CUPCAKE) public static int getStatusBarHeight(Activityactivity) { Rectframe = new Rect(); activity.getWindow().getDecorView().getWindowVisibleDisplayFrame(frame); return frame.top; }</div> 8.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)
Java
public static int getTopBarHeight(Activity activity) { return activity.getWindow().findViewById(Window.ID_ANDROID_CONTENT) .getTop(); }public static int getTopBarHeight(Activityactivity) { return activity.getWindow().findViewById(Window.ID_ANDROID_CONTENT) .getTop(); }</div> 9.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）
Java
public static String getNetworkOperator(Context context) { TelephonyManager telephonyManager = (TelephonyManager) context .getSystemService(Context.TELEPHONY_SERVICE); return telephonyManager.getNetworkOperator(); }public static String getNetworkOperator(Contextcontext) { TelephonyManagertelephonyManager = (TelephonyManager) context .getSystemService(Context.TELEPHONY_SERVICE); return telephonyManager.getNetworkOperator(); }</div> 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)
Java
public static String getNetworkOperatorName(Context context) { TelephonyManager telephonyManager = (TelephonyManager) context .getSystemService(Context.TELEPHONY_SERVICE); return telephonyManager.getNetworkOperatorName(); }public static String getNetworkOperatorName(Contextcontext) { TelephonyManagertelephonyManager = (TelephonyManager) context .getSystemService(Context.TELEPHONY_SERVICE); return telephonyManager.getNetworkOperatorName(); }</div> 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
Java
public static int getPhoneType(Context context) { TelephonyManager telephonyManager = (TelephonyManager) context .getSystemService(Context.TELEPHONY_SERVICE); return telephonyManager.getPhoneType(); }public static int getPhoneType(Contextcontext) { TelephonyManagertelephonyManager = (TelephonyManager) context .getSystemService(Context.TELEPHONY_SERVICE); return telephonyManager.getPhoneType(); }</div> 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
Java
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; } }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(Contextcontext) { TelephonyManagertelephonyManager = (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; } }</div> 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:
Java
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; }public static int getNetWorkStatus(Contextcontext) { int netWorkType = Constants.NETWORK_CLASS_UNKNOWN; ConnectivityManagerconnectivityManager = (ConnectivityManager) context .getSystemService(Context.CONNECTIVITY_SERVICE); NetworkInfonetworkInfo = 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; }</div> </div>