36个Android开发常用代码片段

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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);
    }

 

唤醒屏幕并解锁

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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

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<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

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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;
    }

需要添加权限

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

 

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);
    }

 

动态隐藏软键盘

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@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

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@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

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@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

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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();
    }

 

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）

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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)

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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

  1. PHONE_TYPE_NONE :0 手机制式未知
  2. PHONE_TYPE_GSM :1 手机制式为GSM，移动和联通
  3. PHONE_TYPE_CDMA :2 手机制式为CDMA，电信
  4. PHONE_TYPE_SIP:3
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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);
    }

 

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）

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/**
     * @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）。

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/**
     *
     * @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 + "";
            }
            h += hUnit;
        }
        temp = temp % hper;
        if (temp / mper > 0) {
            if (isFormat) {
                m = temp / mper < 10 ? "0" + temp / mper : temp / mper + "";
            } else {
                m = temp / mper + "";
            }
            m += mUnit;
        }
        temp = temp % mper;
        if (temp / sper > 0) {
            if (isFormat) {
                s = temp / sper < 10 ? "0" + temp / sper : temp / sper + "";
            } else {
                s = temp / sper + "";
            }
            s += sUnit;
        }
        return h + m + s;
    }

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分钟）

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/**
     *
     * @param millis
     *            要转化的毫秒数。
     * @param isWhole
     *            是否强制全部显示小时/分。
     * @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分钟）。
     */
    public static String millisToStringShort(long millis, boolean isWhole,
            boolean isFormat) {
        String h = "";
        String m = "";
        if (isWhole) {
            h = isFormat ? "00小时" : "0小时";
            m = isFormat ? "00分钟" : "0分钟";
        }
        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 += "分钟";
        }
        return h + m;
    }

 

把日期毫秒转化为字符串

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/**
     * @param millis
     *            要转化的日期毫秒数。
     * @param pattern
     *            要转化为的字符串格式（如：yyyy-MM-dd HH:mm:ss）。
     * @return 返回日期字符串。
     */
    public static String millisToStringDate(long millis, String pattern) {
        SimpleDateFormat format = new SimpleDateFormat(pattern,
                Locale.getDefault());
        return format.format(new Date(millis));
    }

 

把日期毫秒转化为字符串（文件名）

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/**
     * @param millis
     *            要转化的日期毫秒数。
     * @param pattern
     *            要转化为的字符串格式（如：yyyy-MM-dd HH:mm:ss）。
     * @return 返回日期字符串（yyyy_MM_dd_HH_mm_ss）。
     */
    public static String millisToStringFilename(long millis, String pattern) {
        String dateStr = millisToStringDate(millis, pattern);
        return dateStr.replaceAll("[- :]", "_");
    }

 

转换当前时间为易用时间格式

1小时内用，多少分钟前； 超过1小时，显示时间而无日期； 如果是昨天，则显示昨天 超过昨天再显示日期； 超过1年再显示年。

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public static long oneHourMillis = 60 * 60 * 1000; // 一小时的毫秒数
public static long oneDayMillis = 24 * oneHourMillis; // 一天的毫秒数
public static long oneYearMillis = 365 * oneDayMillis; // 一年的毫秒数
public static String millisToLifeString(long millis) {
        long now = System.currentTimeMillis();
        long todayStart = string2Millis(millisToStringDate(now, "yyyy-MM-dd"),
                "yyyy-MM-dd");
        // 一小时内
        if (now - millis <= oneHourMillis && now - millis > 0l) {
            String m = millisToStringShort(now - millis, false, false);
            return "".equals(m) ? "1分钟内" : m + "前";
        }
         // 大于今天开始开始值，小于今天开始值加一天（即今天结束值）
        if (millis >= todayStart && millis <= oneDayMillis + todayStart) {
            return "今天 " + millisToStringDate(millis, "HH:mm");
        }
         // 大于（今天开始值减一天，即昨天开始值）
        if (millis > todayStart - oneDayMillis) {
            return "昨天 " + millisToStringDate(millis, "HH:mm");
        }
        long thisYearStart = string2Millis(millisToStringDate(now, "yyyy"),
                "yyyy");
         // 大于今天小于今年
        if (millis > thisYearStart) {
            return millisToStringDate(millis, "MM月dd日 HH:mm");
        }
        return millisToStringDate(millis, "yyyy年MM月dd日 HH:mm");
    }

 

字符串解析成毫秒数

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public static long string2Millis(String str, String pattern) {
        SimpleDateFormat format = new SimpleDateFormat(pattern,
                Locale.getDefault());
        long millis = 0;
        try {
            millis = format.parse(str).getTime();
        } catch (ParseException e) {
            Log.e("TAG", e.getMessage());
        }
        return millis;
    }

 

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+)*";

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