36個Android開發常用代碼片段

常用代碼片段
//36個Android開發常用代碼片段
//撥打電話
public static void call(Context context, String phoneNumber) {

     context.startActivity( new Intent(Intent.ACTION_CALL, Uri.parse( "tel:" + phoneNumber)));

   }

//跳轉至撥号界面
public static void callDial(Context context, String phoneNumber) {

     context.startActivity( new Intent(Intent.ACTION_DIAL, Uri.parse( "tel:" + phoneNumber)));

   }

//發送短信
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);

   }

//喚醒螢幕并解鎖
public static void wakeUpAndUnlock(Context context){ 

     KeyguardManager km= (KeyguardManager) context.getSystemService(Context.KEYGUARD_SERVICE); 

     KeyguardManager.KeyguardLock kl = km.newKeyguardLock( "unLock" ); 

     //解鎖 

     kl.disableKeyguard(); 

     //擷取電源管理器對象 

     PowerManager pm=(PowerManager) context.getSystemService(Context.POWER_SERVICE); 

     //擷取PowerManager.WakeLock對象,後面的參數|表示同時傳入兩個值,最後的是LogCat裡用的Tag 

     PowerManager.WakeLock wl = pm.newWakeLock(PowerManager.ACQUIRE_CAUSES_WAKEUP | PowerManager.SCREEN_DIM_WAKE_LOCK, "bright" ); 

     //點亮螢幕 

     wl.acquire(); 

     //釋放 

     wl.release(); 

   }

//需要添權重限

<uses-permission android:name= "android.permission.WAKE_LOCK" />

<uses-permission android:name= "android.permission.DISABLE_KEYGUARD" />

//判斷目前App處于前台還是背景狀态
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 ;

   }

//需要添權重限

<uses-permission

    android:name= "android.permission.GET_TASKS" />

//判斷目前手機是否處于鎖屏(睡眠)狀态
public static boolean isSleeping(Context context) {

     KeyguardManager kgMgr = (KeyguardManager) context

         .getSystemService(Context.KEYGUARD_SERVICE);

     boolean isSleeping = kgMgr.inKeyguardRestrictedInputMode();

     return isSleeping;

   }

//判斷目前是否有網絡連接配接
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 ;

   }

//判斷目前是否是WIFI連接配接狀态
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 ;

}

//安裝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);

}

//判斷目前裝置是否為手機
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 ;

   }

}

//擷取目前裝置寬高，機關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();

}

//擷取目前裝置的IMEI，需要與上面的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;

}

//擷取目前裝置的MAC位址
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;

}

//擷取目前程式的版本号
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;

}

//收集裝置資訊，用于資訊統計分析
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);

   }

//動态隐藏軟鍵盤
@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 );

   }

//動态顯示軟鍵盤
@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 );

   }

//動态顯示或者是隐藏軟鍵盤
@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 );

   }

//主動回到Home，背景運作
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);

   }

//擷取狀态欄高度
//注意，要在onWindowFocusChanged中調用，在onCreate中擷取高度為0

@TargetApi (Build.VERSION_CODES.CUPCAKE)

public static int getStatusBarHeight(Activity activity) {

   Rect frame = new Rect();

   activity.getWindow().getDecorView().getWindowVisibleDisplayFrame(frame);

     return frame.top;

   }

//擷取狀态欄高度＋标題欄(ActionBar)高度
//(注意，如果沒有ActionBar，那麼擷取的高度将和上面的是一樣的，隻有狀态欄的高度)

public static int getTopBarHeight(Activity activity) {

     return activity.getWindow().findViewById(Window.ID_ANDROID_CONTENT)

         .getTop();

   }

//擷取MCC+MNC代碼 (SIM卡營運商國家代碼和營運商網絡代碼)
//僅當使用者已在網絡注冊時有效, CDMA 可能會無效（中國移動：46000 //46002, 中國聯通：46001,中國電信：46003）

public static String getNetworkOperator(Context context) {

     TelephonyManager telephonyManager = (TelephonyManager) context

         .getSystemService(Context.TELEPHONY_SERVICE);

     return telephonyManager.getNetworkOperator();

   }

//傳回移動網絡營運商的名字
//(例：中國聯通、中國移動、中國電信) 僅當使用者已在網絡注冊時有效, //CDMA 可能會無效)

public static String getNetworkOperatorName(Context context) {

     TelephonyManager telephonyManager = (TelephonyManager) context

         .getSystemService(Context.TELEPHONY_SERVICE);

     return telephonyManager.getNetworkOperatorName();

   }

//傳回移動終端類型
PHONE_TYPE_NONE :0 手機制式未知
PHONE_TYPE_GSM :1 手機制式為GSM，移動和聯通
PHONE_TYPE_CDMA :2 手機制式為CDMA，電信
PHONE_TYPE_SIP:3
public static int getPhoneType(Context context) {

     TelephonyManager telephonyManager = (TelephonyManager) context

         .getSystemService(Context.TELEPHONY_SERVICE);

     return telephonyManager.getPhoneType();

   }

//判斷手機連接配接的網絡類型(2G,3G,4G)
//聯通的3G為UMTS或HSDPA，移動和聯通的2G為GPRS或EGDE，電信的2G為CDMA，電信的3G為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;

     }

   }

//判斷目前手機的網絡類型(WIFI還是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轉換
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轉換
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);

   }

//把一個毫秒數轉化成時間字元串
//格式為小時/分/秒/毫秒（如：24903600 –> 06小時55分03秒600毫秒）

/**

    * @param millis

    *            要轉化的毫秒數。

    * @param isWhole

    *            是否強制全部顯示小時/分/秒/毫秒。

    * @param isFormat

    *            時間數字是否要格式化，如果true：少位數前面補全；如果false：少位數前面不補全。

    * @return 傳回時間字元串：小時/分/秒/毫秒的格式（如：24903600 --> 06小時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小時" : "0小時" ;

       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 += "小時" ;

     }

     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;

   }

格式為小時/分/秒/毫秒（如：24903600 –> 06小時55分03秒）。

/**

    *

    * @param millis

    *            要轉化的毫秒數。

    * @param isWhole

    *            是否強制全部顯示小時/分/秒/毫秒。

    * @param isFormat

    *            時間數字是否要格式化，如果true：少位數前面補全；如果false：少位數前面不補全。

    * @return 傳回時間字元串：小時/分/秒/毫秒的格式（如：24903600 --> 06小時55分03秒）。

    */

   public static String millisToStringMiddle( long millis, boolean isWhole,

       boolean isFormat) {

     return millisToStringMiddle(millis, isWhole, isFormat, "小時" , "分鐘" , "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 + "" ;

       }
36個Android開發常用代碼片段

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