36个Android开发常用经典代码大全

• Z时代
• 2024-01-10
• 分类：综合

本文汇集36个Android开发常用经典代码片段，包括拨打电话、发送短信、唤醒屏幕并解锁、是否有网络连接、动态显示或者是隐藏软键盘等，希望对您有所帮助。

//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
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();
  }
//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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