Android Studio - Android 12 外部存儲空間路徑程式（一百零九）

Android Studio - Android 12 外部存儲空間路徑程式（一百零九）：

筆者完成了 Android 12 內部存儲空間（Internal Storage）的路徑測試程式，也開始實驗 Android 12 外部存儲空間（External Storage）的路徑測試程式。

Android Studio - Android 12 外部存儲空間路徑程式（一百零九）：

操作系統：Windows 7 64-bit 版本
開發環境：Android Studio 4.0.1 版本
最低 SDK 版本：minSdkVersion 24
測試手機：Samsung Galaxy M33 5G
測試手機系統版本：Android 12（Snow Cone / 2021）
原程式：C:\Development\Development_Android\DIY-Android-190-15d Android12ReadWriteFile bugworkshop 20230304 - ReadWriteFileStorage
程式：C:\Development\Development_Android\Android_Project\DIY-Android-190-15d Android12ReadWriteFile bugworkshop 20230304 - ReadWriteFileStorage

MainActivity.java：

public void externallStorage(){           mtxt_hello.setText("External - Read Write Storage");         String PackageName = getPackageName();         Log.d(MainActivity.TAG, "ReadWriteFileInt.internalStorage().getPackageName=" + PackageName );           // File         File getExternalFilesDir = new File(getExternalFilesDir(""), "fileName");         File getExternalCacheDir = new File(getExternalCacheDir(), "fileName");           //File[] getExternalMediaDirs = new File(getExternalCacheDirs(), "fileName");           // String         String getExternalStorageDirectory = Environment.getExternalStorageDirectory().getPath();         String getExternalStoragePublicDirectory = Environment.getExternalStoragePublicDirectory("file").getPath();         String getExternalStorageState = Environment.getExternalStorageState();           // String         File dcimgetExternalStoragePublicDirectory = new File(getExternalStoragePublicDirectory(Environment.DIRECTORY_DCIM), "fileName");         String dcimDirectory = Environment.DIRECTORY_DCIM;         String musicDirectory = Environment.DIRECTORY_MUSIC;         String podcastsDirectory = Environment.DIRECTORY_PODCASTS;         String ringtonesDirectory = Environment.DIRECTORY_RINGTONES;         String alarmDirectory = Environment.DIRECTORY_ALARMS;         String notificationDirectory = Environment.DIRECTORY_NOTIFICATIONS;         String picturesDirectory = Environment.DIRECTORY_PICTURES;         String moviesDirectory = Environment.DIRECTORY_MOVIES;         String downloadsDirectory = Environment.DIRECTORY_DOWNLOADS;         String documentsDirectory = Environment.DIRECTORY_DOCUMENTS;           String content = "";         // File         content = content + "getExternalFilesDir=" + getExternalFilesDir + "\n";         content = content + "getExternalCacheDir=" + getExternalCacheDir  + "\n";         content = content + "Environment.getExternalStorageDirectory=" + getExternalStorageDirectory  + "\n";         content = content + "Environment.getExternalStoragePublicDirectory=" + getExternalStoragePublicDirectory  + "\n";         content = content + "Environment.getExternalStorageState=" + getExternalStorageState  + "\n";           // String         content = content + "Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DCIM)==" + dcimgetExternalStoragePublicDirectory  + "\n";         content = content + "Environment.DIRECTORY_DCIM=" + dcimDirectory  + "\n";         content = content + "Environment.DIRECTORY_MUSIC=" + musicDirectory  + "\n";         content = content + "Environment.DIRECTORY_PODCASTS=" + podcastsDirectory  + "\n";         content = content + "Environment.DIRECTORY_RINGTONES=" + ringtonesDirectory  + "\n";         content = content + "Environment.DIRECTORY_ALARMS=" + alarmDirectory  + "\n";         content = content + "Environment.DIRECTORY_NOTIFICATIONS=" + notificationDirectory  + "\n";         content = content + "Environment.DIRECTORY_PICTURES=" + picturesDirectory  + "\n";         content = content + "Environment.DIRECTORY_MOVIES=" + moviesDirectory  + "\n";         content = content + "Environment.DIRECTORY_DOWNLOADS=" + downloadsDirectory  + "\n";         content = content + "Environment.DIRECTORY_DOCUMENTS=" + documentsDirectory  + "\n";           mtxt_filecontent.setText(content);     }