新手必备的常用 Android 代码片段整理（1）

来源：互联网发布：正交矩阵的特点编辑：程序博客网时间：2024/06/05 09:09

以下内容来自多个开源项目的整理和自己的项目积累
1.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();
    }

2.是否有SD卡

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publicstaticbooleanhaveSDCard(){
        returnandroid.os.Environment.getExternalStorageState().equals(
                android.os.Environment.MEDIA_MOUNTED);
    }

3.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);
    }

4.动态显示软键盘

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@TargetApi(Build.VERSION_CODES.CUPCAKE)
publicstaticvoidshowSoftInput(Contextcontext,EditTextedit){
        edit.setFocusable(true);
        edit.setFocusableInTouchMode(true);
        edit.requestFocus();
        InputMethodManagerinputManager=(InputMethodManager)context
                .getSystemService(Context.INPUT_METHOD_SERVICE);
        inputManager.showSoftInput(edit,0);
    }

5.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);
    }

6.主动回到Home，后台运行

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publicstaticvoidgoHome(Contextcontext){
        IntentmHomeIntent=newIntent(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);
    }

7.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;
    }

8.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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publicstaticintgetTopBarHeight(Activityactivity){
        returnactivity.getWindow().findViewById(Window.ID_ANDROID_CONTENT)
                .getTop();
    }

9.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();
    }

10.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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publicstaticStringgetNetworkOperatorName(Contextcontext){
        TelephonyManagertelephonyManager=(TelephonyManager)context
                .getSystemService(Context.TELEPHONY_SERVICE);
        returntelephonyManager.getNetworkOperatorName();
    }

11.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

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public static int getPhoneType(Context context) {
        TelephonyManager telephonyManager = (TelephonyManager) context
                .getSystemService(Context.TELEPHONY_SERVICE);
        return telephonyManager.getPhoneType();
    }

12.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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publicclassConstants{
    /**
     * Unknown network class
     */
    publicstaticfinalintNETWORK_CLASS_UNKNOWN=0;
 
    /**
     * wifi net work
     */
    publicstaticfinalintNETWORK_WIFI=1;
 
    /**
     * "2G" networks
     */
    publicstaticfinalintNETWORK_CLASS_2_G=2;
 
    /**
     * "3G" networks
     */
    publicstaticfinalintNETWORK_CLASS_3_G=3;
 
    /**
     * "4G" networks
     */
    publicstaticfinalintNETWORK_CLASS_4_G=4;
 
}
 
publicstaticintgetNetWorkClass(Contextcontext){
        TelephonyManagertelephonyManager=(TelephonyManager)context
                .getSystemService(Context.TELEPHONY_SERVICE);
 
        switch(telephonyManager.getNetworkType()){
        caseTelephonyManager.NETWORK_TYPE_GPRS:
        caseTelephonyManager.NETWORK_TYPE_EDGE:
        caseTelephonyManager.NETWORK_TYPE_CDMA:
        caseTelephonyManager.NETWORK_TYPE_1xRTT:
        caseTelephonyManager.NETWORK_TYPE_IDEN:
            returnConstants.NETWORK_CLASS_2_G;
 
        caseTelephonyManager.NETWORK_TYPE_UMTS:
        caseTelephonyManager.NETWORK_TYPE_EVDO_0:
        caseTelephonyManager.NETWORK_TYPE_EVDO_A:
        caseTelephonyManager.NETWORK_TYPE_HSDPA:
        caseTelephonyManager.NETWORK_TYPE_HSUPA:
        caseTelephonyManager.NETWORK_TYPE_HSPA:
        caseTelephonyManager.NETWORK_TYPE_EVDO_B:
        caseTelephonyManager.NETWORK_TYPE_EHRPD:
        caseTelephonyManager.NETWORK_TYPE_HSPAP:
            returnConstants.NETWORK_CLASS_3_G;
 
        caseTelephonyManager.NETWORK_TYPE_LTE:
            returnConstants.NETWORK_CLASS_4_G;
 
        default:
            returnConstants.NETWORK_CLASS_UNKNOWN;
        }
    }

13.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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publicstaticintgetNetWorkStatus(Contextcontext){
        intnetWorkType=Constants.NETWORK_CLASS_UNKNOWN;
 
        ConnectivityManagerconnectivityManager=(ConnectivityManager)context
                .getSystemService(Context.CONNECTIVITY_SERVICE);
        NetworkInfonetworkInfo=connectivityManager.getActiveNetworkInfo();
 
        if(networkInfo!=null&&networkInfo.isConnected()){
            inttype=networkInfo.getType();
 
            if(type==ConnectivityManager.TYPE_WIFI){
                netWorkType=Constants.NETWORK_WIFI;
            }elseif(type==ConnectivityManager.TYPE_MOBILE){
                netWorkType=getNetWorkClass(context);
            }
        }
 
        returnnetWorkType;
    }

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