新手必備的常用 Android 代碼片段整理（2）

jadr8110 8年前發布 | 10K 次閱讀 Java 安卓開發 Android開發移動開發

以下內容來自多個開源項目的整理和自己的項目積累

1.收集設備信息，用于信息統計分析

Java

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();
    }

public static PropertiescollectDeviceInfo(Contextcontext) {
        PropertiesmDeviceCrashInfo = new Properties();
        try {
            PackageManagerpm = context.getPackageManager();
            PackageInfopi = 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 (Fieldfield : 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(Contextcontext) {
        Propertiesprop = collectDeviceInfo(context);
        SetdeviceInfos = prop.keySet();
        StringBuilderdeviceInfoStr = new StringBuilder("{\n");
        for (Iteratoriter = 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

Java

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

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

3.動態隱藏軟鍵盤

Java

@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);
    }

@TargetApi(Build.VERSION_CODES.CUPCAKE)
    public static void hideSoftInput(Activityactivity) {
        Viewview = activity.getWindow().peekDecorView();
        if (view != null) {
            InputMethodManagerinputmanger = (InputMethodManager) activity
                    .getSystemService(Context.INPUT_METHOD_SERVICE);
            inputmanger.hideSoftInputFromWindow(view.getWindowToken(), 0);
        }
    }
 
    @TargetApi(Build.VERSION_CODES.CUPCAKE)
public static void hideSoftInput(Contextcontext, EditTextedit) {
        edit.clearFocus();
        InputMethodManagerinputmanger = (InputMethodManager) context
                .getSystemService(Context.INPUT_METHOD_SERVICE);
        inputmanger.hideSoftInputFromWindow(edit.getWindowToken(), 0);
    }

4.動態顯示軟鍵盤

Java

@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);
    }

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

5.動態顯示或者是隱藏軟鍵盤

Java

@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);
    }

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

6.主動回到Home，后臺運行

Java

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);
    }

public static void goHome(Contextcontext) {
        IntentmHomeIntent = 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);
    }

7.獲取狀態欄高度

注意，要在 onWindowFocusChanged中調用，在onCreate中獲取高度為0

Java

@TargetApi(Build.VERSION_CODES.CUPCAKE)
public static int getStatusBarHeight(Activity activity) {
    Rect frame = new Rect();
    activity.getWindow().getDecorView().getWindowVisibleDisplayFrame(frame);
        return frame.top;
    }

@TargetApi(Build.VERSION_CODES.CUPCAKE)
public static int getStatusBarHeight(Activityactivity) {
    Rectframe = new Rect();
    activity.getWindow().getDecorView().getWindowVisibleDisplayFrame(frame);
        return frame.top;
    }

8.獲取狀態欄高度＋標題欄(ActionBar)高度

(注意，如果沒有ActionBar，那么獲取的高度將和上面的是一樣的，只有狀態欄的高度)

Java

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

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

9.獲取MCC+MNC代碼 (SIM卡運營商國家代碼和運營商網絡代碼)

僅當用戶已在網絡注冊時有效, CDMA 可能會無效（中國移動：46000 46002, 中國聯通：46001,中國電信：46003）

Java

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

public static String getNetworkOperator(Contextcontext) {
        TelephonyManagertelephonyManager = (TelephonyManager) context
                .getSystemService(Context.TELEPHONY_SERVICE);
        return telephonyManager.getNetworkOperator();
    }

10.返回移動網絡運營商的名字

(例：中國聯通、中國移動、中國電信) 僅當用戶已在網絡注冊時有效, CDMA 可能會無效)

Java

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

public static String getNetworkOperatorName(Contextcontext) {
        TelephonyManagertelephonyManager = (TelephonyManager) context
                .getSystemService(Context.TELEPHONY_SERVICE);
        return telephonyManager.getNetworkOperatorName();
    }

11.返回移動終端類型

PHONE_TYPE_NONE :0 手機制式未知

PHONE_TYPE_GSM :1 手機制式為GSM，移動和聯通

PHONE_TYPE_CDMA :2 手機制式為CDMA，電信

PHONE_TYPE_SIP:3

Java

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

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

12.判斷手機連接的網絡類型(2G,3G,4G)

聯通的3G為UMTS或HSDPA，移動和聯通的2G為GPRS或EGDE，電信的2G為CDMA，電信的3G為EVDO

Java

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;
    }
}

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(Contextcontext) {
        TelephonyManagertelephonyManager = (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;
        }
    }

13.判斷當前手機的網絡類型(WIFI還是2,3,4G)

需要用到上面的方法:

Java

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;
    }

public static int getNetWorkStatus(Contextcontext) {
        int netWorkType = Constants.NETWORK_CLASS_UNKNOWN;
 
        ConnectivityManagerconnectivityManager = (ConnectivityManager) context
                .getSystemService(Context.CONNECTIVITY_SERVICE);
        NetworkInfonetworkInfo = 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;
    }

來自： http://android.jobbole.com/82315/

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Java 安卓開發 Android開發移動開發

新手必備的常用 Android 代碼片段整理（2）

2.是否有SD卡

3.動態隱藏軟鍵盤

4.動態顯示軟鍵盤

5.動態顯示或者是隱藏軟鍵盤

6.主動回到Home，后臺運行

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