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;
    }

作者：凯子哥
文章源自：http://blog.csdn.net/zhaokaiqiang1992