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( "{
" );
 
     for (Iterator iter = deviceInfos.iterator(); iter.hasNext();) {
 
       Object item = iter.next();
 
       deviceInfoStr.append( "			" + item + ":" + prop.get(item)
 
           + ", 
" );
 
     }
 
     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

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)

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

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

public static int getPhoneType(Context context) {
 
     TelephonyManager telephonyManager = (TelephonyManager) context
 
         .getSystemService(Context.TELEPHONY_SERVICE);
 
     return telephonyManager.getPhoneType();
 
   }

把一个毫秒数转化成时间字符串

[size=13.3333px]格式为小时/分/秒/毫秒（如：24903600 –> 06小时55分03秒600毫秒）

[size=13.3333px]

/**
 
    * @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 + "" ;
 
       }