Android：新手必备的常用代码片段整理（一）

以下内容来自多个开源项目的整理和自己的项目积累。

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;    }