Android開發——DeviceUtil，獲取Android設備信息的工具類

Android 設備工具DeviceUtil
Android 設備工具DeviceUtil dp轉換px px轉換dp 設備寬度 設備高度 SD卡判斷 網絡判斷 VersionName VersionCode DeviceId 手機品牌 手機型號 系統Android API等級 系統Android 版本 App進程id App進程Name 創建App緩存文件夾 Uri轉換File 獲取AndroidManifestxml里meta data的值 DeviceUtil全部源碼

dp轉換px
在自定義View中必須用到這個方法。自定義View的時候，不能像在xml那樣可以設置dp（密度），只能設置px（像素）。不同分辨率的設備，設置px，顯示就不會一樣了。為了結合設計圖設置dp，需要將dp轉換為px值，然后再設置。

Java" hljs="" java="">    /**
     * dp 轉化為 px
     * @param context
     * @param dpValue
     * @return
     */
    public static int dp2px(Context context, float dpValue) {
        final float scale = context.getResources().getDisplayMetrics().density;
        return (int) (dpValue * scale + 0.5f);
    }
px轉換dp
    /**
     * px 轉化為 dp
     * @param context
     * @param pxValue
     * @return
     */
    public static int px2dp(Context context, float pxValue) {
        final float scale = context.getResources().getDisplayMetrics().density;
        return (int) (pxValue / scale + 0.5f);
    }
設備寬度
    /**
     * 獲取設備寬度（px）
     * @param context
     * @return
     */
    public static int deviceWidth(Context context) {
        return context.getResources().getDisplayMetrics().widthPixels;
    }
設備高度
    /**
     * 獲取設備高度（px）
     * @param context
     * @return
     */
    public static int deviceHeight(Context context) {
        return context.getResources().getDisplayMetrics().heightPixels;
    }
SD卡判斷
    /**
     * SD卡判斷
     * @return
     */
    public static boolean isSDCardAvailable() {
        return Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED);
    }
網絡判斷
    /**
     * 是否有網
     * @param context
     * @return
     */
    public static boolean isNetworkConnected(Context context) {
        if (context != null) {
            ConnectivityManager mConnectivityManager = (ConnectivityManager) context
                    .getSystemService(Context.CONNECTIVITY_SERVICE);
            NetworkInfo mNetworkInfo = mConnectivityManager
                    .getActiveNetworkInfo();
            if (mNetworkInfo != null) {
                return mNetworkInfo.isAvailable();
            }
        }
        return false;
    }
VersionName
對應build.gradle中的versionName

    /**
     * 返回版本名字
     * 對應build.gradle中的versionName
     *
     * @param context
     * @return
     */
    public static String getVersionName(Context context) {
        String versionName = ;
        try {
            PackageManager packageManager = context.getPackageManager();
            PackageInfo packInfo = packageManager.getPackageInfo(context.getPackageName(), 0);
            versionName = packInfo.versionName;
        } catch (Exception e) {
            e.printStackTrace();
        }
        return versionName;
    }
VersionCode
對應build.gradle中的versionCode

    /**
     * 返回版本號
     * 對應build.gradle中的versionCode
     *
     * @param context
     * @return
     */
    public static String getVersionCode(Context context) {
        String versionCode = ;
        try {
            PackageManager packageManager = context.getPackageManager();
            PackageInfo packInfo = packageManager.getPackageInfo(context.getPackageName(), 0);
            versionCode = String.valueOf(packInfo.versionCode);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return versionCode;
    }
DeviceId
每台設備都有唯一的標識，這就是DeviceId

    /**
     * 獲取設備的唯一標識，deviceId
     *
     * @param context
     * @return
     */
    public static String getDeviceId(Context context) {
        TelephonyManager tm = (TelephonyManager) context.getSystemService(Context.TELEPHONY_SERVICE);
        String deviceId = tm.getDeviceId();
        if (deviceId == null) {
            return -;
        } else {
            return deviceId;
        }
    }
手機品牌
    /**
     * 獲取手機品牌
     *
     * @return
     */
    public static String getPhoneBrand() {
        return android.os.Build.BRAND;
    }
手機型號
    /**
     * 獲取手機型號
     *
     * @return
     */
    public static String getPhoneModel() {
        return android.os.Build.MODEL;
    }
系統Android API等級
    /**
     * 獲取手機Android API等級（22、23 ...）
     *
     * @return
     */
    public static int getBuildLevel() {
        return android.os.Build.VERSION.SDK_INT;
    }
系統android-版本">系統Android 版本
   /**
     * 獲取手機Android 版本（4.4、5.0、5.1 ...）
     *
     * @return
     */
    public static String getBuildVersion() {
        return android.os.Build.VERSION.RELEASE;
    }
App進程id
    /**
     * 獲取當前App進程的id
     *
     * @return
     */
    public static int getAppProcessId() {
        return android.os.Process.myPid();
    }
App進程Name

    /**
     * 獲取當前App進程的Name
     *
     * @param context
     * @param processId
     * @return
     */
    public static String getAppProcessName(Context context, int processId) {
        String processName = null;
        ActivityManager am = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);
        // 獲取所有運行App的進程集合
        List l = am.getRunningAppProcesses();
        Iterator i = l.iterator();
        PackageManager pm = context.getPackageManager();
        while (i.hasNext()) {
            ActivityManager.RunningAppProcessInfo info = (ActivityManager.RunningAppProcessInfo) (i.next());
            try {
                if (info.pid == processId) {
                    CharSequence c = pm.getApplicationLabel(pm.getApplicationInfo(info.processName, PackageManager.GET_META_DATA));

                    processName = info.processName;
                    return processName;
                }
            } catch (Exception e) {
                Log.e(DeviceUtil.class.getName(), e.getMessage(), e);
            }
        }
        return processName;
    }
創建App緩存文件夾
    /**
     * 創建App文件夾
     *
     * @param appName
     * @param application
     * @return
     */
    public static String createAPPFolder(String appName, Application application) {
        return createAPPFolder(appName, application, null);
    }

    /**
     * 創建App文件夾
     *
     * @param appName
     * @param application
     * @param folderName
     * @return
     */
    public static String createAPPFolder(String appName, Application application, String folderName) {
        File root = Environment.getExternalStorageDirectory();
        File folder;
        /**
         * 如果存在SD卡
         */
        if (DeviceUtil.isSDCardAvailable() && root != null) {
            folder = new File(root, appName);
            if (!folder.exists()) {
                folder.mkdirs();
            }
        } else {
            /**
             * 不存在SD卡，就放到緩存文件夾內
             */
            root = application.getCacheDir();
            folder = new File(root, appName);
            if (!folder.exists()) {
                folder.mkdirs();
            }
        }
        if (folderName != null) {
            folder = new File(folder, folderName);
            if (!folder.exists()) {
                folder.mkdirs();
            }
        }
        return folder.getAbsolutePath();
    }
Uri轉換File
    /**
     * 通過Uri找到File
     *
     * @param context
     * @param uri
     * @return
     */
    public static File uri2File(Activity context, Uri uri) {
        File file;
        String[] project = {MediaStore.Images.Media.DATA};
        Cursor actualImageCursor = context.getContentResolver().query(uri, project, null, null, null);
        if (actualImageCursor != null) {
            int actual_image_column_index = actualImageCursor
                    .getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
            actualImageCursor.moveToFirst();
            String img_path = actualImageCursor
                    .getString(actual_image_column_index);
            file = new File(img_path);
        } else {
            file = new File(uri.getPath());
        }
        if (actualImageCursor != null) actualImageCursor.close();
        return file;
    }
獲取AndroidManifest.xml里meta data的值
AndroidManifest.xml

比如自定義了一個
meta-data
，名為DEBUG。

build.gradle

然后在build.gradle里給這個DEBUG賦值了。

    //渠道Flavors
    productFlavors {
        APPTest {
            applicationId com.zyy.camnter.newlife
            manifestPlaceholders = [DEBUG         : debug]
        }
    }
可以通過一下方法取得AndroidManifest.xml里DEBUG被賦上的值：

    /**
     * 獲取AndroidManifest.xml里 的值
     *
     * @param context
     * @param name
     * @return
     */
    public static String getMetaData(Context context, String name) {
        String value = null;
        try {
            ApplicationInfo appInfo = context.getPackageManager().getApplicationInfo(context.getPackageName(), PackageManager.GET_META_DATA);
            value = appInfo.metaData.getString(name);
        } catch (PackageManager.NameNotFoundException e) {
            e.printStackTrace();
        }
        return value;
    }
DeviceUtil全部源碼
public class DeviceUtil {

    /**
     * dp 轉化為 px
     *
     * @param context
     * @param dpValue
     * @return
     */
    public static int dp2px(Context context, float dpValue) {
        final float scale = context.getResources().getDisplayMetrics().density;
        return (int) (dpValue * scale + 0.5f);
    }

    /**
     * px 轉化為 dp
     *
     * @param context
     * @param pxValue
     * @return
     */
    public static int px2dp(Context context, float pxValue) {
        final float scale = context.getResources().getDisplayMetrics().density;
        return (int) (pxValue / scale + 0.5f);
    }

    /**
     * 獲取設備寬度（px）
     *
     * @param context
     * @return
     */
    public static int deviceWidth(Context context) {
        return context.getResources().getDisplayMetrics().widthPixels;
    }

    /**
     * 獲取設備高度（px）
     *
     * @param context
     * @return
     */
    public static int deviceHeight(Context context) {
        return context.getResources().getDisplayMetrics().heightPixels;
    }

    /**
     * SD卡判斷
     *
     * @return
     */
    public static boolean isSDCardAvailable() {
        return Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED);
    }

    /**
     * 是否有網
     *
     * @param context
     * @return
     */
    public static boolean isNetworkConnected(Context context) {
        if (context != null) {
            ConnectivityManager mConnectivityManager = (ConnectivityManager) context
                    .getSystemService(Context.CONNECTIVITY_SERVICE);
            NetworkInfo mNetworkInfo = mConnectivityManager
                    .getActiveNetworkInfo();
            if (mNetworkInfo != null) {
                return mNetworkInfo.isAvailable();
            }
        }
        return false;
    }

    /**
     * 返回版本名字
     * 對應build.gradle中的versionName
     *
     * @param context
     * @return
     */
    public static String getVersionName(Context context) {
        String versionName = ;
        try {
            PackageManager packageManager = context.getPackageManager();
            PackageInfo packInfo = packageManager.getPackageInfo(context.getPackageName(), 0);
            versionName = packInfo.versionName;
        } catch (Exception e) {
            e.printStackTrace();
        }
        return versionName;
    }

    /**
     * 返回版本號
     * 對應build.gradle中的versionCode
     *
     * @param context
     * @return
     */
    public static String getVersionCode(Context context) {
        String versionCode = ;
        try {
            PackageManager packageManager = context.getPackageManager();
            PackageInfo packInfo = packageManager.getPackageInfo(context.getPackageName(), 0);
            versionCode = String.valueOf(packInfo.versionCode);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return versionCode;
    }

    /**
     * 獲取設備的唯一標識，deviceId
     *
     * @param context
     * @return
     */
    public static String getDeviceId(Context context) {
        TelephonyManager tm = (TelephonyManager) context.getSystemService(Context.TELEPHONY_SERVICE);
        String deviceId = tm.getDeviceId();
        if (deviceId == null) {
            return -;
        } else {
            return deviceId;
        }
    }

    /**
     * 獲取手機品牌
     *
     * @return
     */
    public static String getPhoneBrand() {
        return android.os.Build.BRAND;
    }

    /**
     * 獲取手機型號
     *
     * @return
     */
    public static String getPhoneModel() {
        return android.os.Build.MODEL;
    }

    /**
     * 獲取手機Android API等級（22、23 ...）
     *
     * @return
     */
    public static int getBuildLevel() {
        return android.os.Build.VERSION.SDK_INT;
    }

    /**
     * 獲取手機Android 版本（4.4、5.0、5.1 ...）
     *
     * @return
     */
    public static String getBuildVersion() {
        return android.os.Build.VERSION.RELEASE;
    }

    /**
     * 獲取當前App進程的id
     *
     * @return
     */
    public static int getAppProcessId() {
        return android.os.Process.myPid();
    }

    /**
     * 獲取當前App進程的Name
     *
     * @param context
     * @param processId
     * @return
     */
    public static String getAppProcessName(Context context, int processId) {
        String processName = null;
        ActivityManager am = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);
        // 獲取所有運行App的進程集合
        List l = am.getRunningAppProcesses();
        Iterator i = l.iterator();
        PackageManager pm = context.getPackageManager();
        while (i.hasNext()) {
            ActivityManager.RunningAppProcessInfo info = (ActivityManager.RunningAppProcessInfo) (i.next());
            try {
                if (info.pid == processId) {
                    CharSequence c = pm.getApplicationLabel(pm.getApplicationInfo(info.processName, PackageManager.GET_META_DATA));

                    processName = info.processName;
                    return processName;
                }
            } catch (Exception e) {
                Log.e(DeviceUtil.class.getName(), e.getMessage(), e);
            }
        }
        return processName;
    }

    /**
     * 創建App文件夾
     *
     * @param appName
     * @param application
     * @return
     */
    public static String createAPPFolder(String appName, Application application) {
        return createAPPFolder(appName, application, null);
    }

    /**
     * 創建App文件夾
     *
     * @param appName
     * @param application
     * @param folderName
     * @return
     */
    public static String createAPPFolder(String appName, Application application, String folderName) {
        File root = Environment.getExternalStorageDirectory();
        File folder;
        /**
         * 如果存在SD卡
         */
        if (DeviceUtil.isSDCardAvailable() && root != null) {
            folder = new File(root, appName);
            if (!folder.exists()) {
                folder.mkdirs();
            }
        } else {
            /**
             * 不存在SD卡，就放到緩存文件夾內
             */
            root = application.getCacheDir();
            folder = new File(root, appName);
            if (!folder.exists()) {
                folder.mkdirs();
            }
        }
        if (folderName != null) {
            folder = new File(folder, folderName);
            if (!folder.exists()) {
                folder.mkdirs();
            }
        }
        return folder.getAbsolutePath();
    }

    /**
     * 通過Uri找到File
     *
     * @param context
     * @param uri
     * @return
     */
    public static File uri2File(Activity context, Uri uri) {
        File file;
        String[] project = {MediaStore.Images.Media.DATA};
        Cursor actualImageCursor = context.getContentResolver().query(uri, project, null, null, null);
        if (actualImageCursor != null) {
            int actual_image_column_index = actualImageCursor
                    .getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
            actualImageCursor.moveToFirst();
            String img_path = actualImageCursor
                    .getString(actual_image_column_index);
            file = new File(img_path);
        } else {
            file = new File(uri.getPath());
        }
        if (actualImageCursor != null) actualImageCursor.close();
        return file;
    }

    /**
     * 獲取AndroidManifest.xml里 的值
     *
     * @param context
     * @param name
     * @return
     */
    public static String getMetaData(Context context, String name) {
        String value = null;
        try {
            ApplicationInfo appInfo = context.getPackageManager().getApplicationInfo(context.getPackageName(), PackageManager.GET_META_DATA);
            value = appInfo.metaData.getString(name);
        } catch (PackageManager.NameNotFoundException e) {
            e.printStackTrace();
        }
        return value;
    }

}