Android开发常用代码片段
breewf
 2016-03-04 12:58:46    

拨打电话

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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

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

发送短信

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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);
    }

判断当前App处于前台还是后台状态

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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;
    }

判断当前手机是否处于锁屏(睡眠)状态

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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

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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

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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

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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

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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

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@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

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@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

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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

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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

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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

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

回到Home，后台运行

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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

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@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

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public static int getTopBarHeight(Activity activity) {
        return activity.getWindow().findViewById(Window.ID_ANDROID_CONTENT)
                .getTop();
    }

返回移动网络运营商的名字

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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

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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

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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

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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

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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

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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);
    }

手机号码正则

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public static final String REG_PHONE_CHINA = "^((13[0-9])|(15[^4,\\D])|(18[0,5-9]))\\d{8}$";

邮箱正则

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public static final String REG_EMAIL = "\\w+([-+.]\\w+)*@\\w+([-.]\\w+)*\\.\\w+([-.]\\w+)*";

参考文章：
36个Android开发常用代码片段