Android\u306e\u5916\u90e8\u30b9\u30c8\u30ec\u30fc\u30b8\u306f\u3001\u30c7\u30fc\u30bf\u306e\u66f8\u304d\u8fbc\u307f\u3084\u4fdd\u5b58\u3001\u8a2d\u5b9a\u30d5\u30a1\u30a4\u30eb\u306e\u8aad\u307f\u53d6\u308a\u306a\u3069\u306b\u4f7f\u7528\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u3053\u306e\u8a18\u4e8b\u306f\u3001Android\u306e\u5185\u90e8\u30b9\u30c8\u30ec\u30fc\u30b8\u30c1\u30e5\u30fc\u30c8\u30ea\u30a2\u30eb\u30b7\u30ea\u30fc\u30ba\u306e\u4e00\u7d9a\u304d\u3067\u3001Android\u3067\u306e\u69cb\u9020\u5316\u30c7\u30fc\u30bf\u306e\u30b9\u30c8\u30ec\u30fc\u30b8\u306b\u95a2\u3059\u308b\u3082\u306e\u3067\u3059\u3002<\/p>\n
SD\u30ab\u30fc\u30c9\u306a\u3069\u306e\u5916\u90e8\u30b9\u30c8\u30ec\u30fc\u30b8\u306b\u306f\u3001\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u30c7\u30fc\u30bf\u3092\u4fdd\u5b58\u3059\u308b\u3053\u3068\u3082\u3067\u304d\u307e\u3059\u304c\u3001\u4fdd\u5b58\u3059\u308b\u30d5\u30a1\u30a4\u30eb\u306b\u306f\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u304c\u9069\u7528\u3055\u308c\u307e\u305b\u3093\u3002\u4e00\u822c\u7684\u306b\u306f\u3001\u5916\u90e8\u30b9\u30c8\u30ec\u30fc\u30b8\u306b\u306f2\u7a2e\u985e\u3042\u308a\u307e\u3059\u3002<\/p>\n
\u3059\u3079\u3066\u306e\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306f\u3001\u5916\u90e8\u30b9\u30c8\u30ec\u30fc\u30b8\u306b\u914d\u7f6e\u3055\u308c\u305f\u30d5\u30a1\u30a4\u30eb\u3092\u8aad\u307f\u66f8\u304d\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u3001\u30e6\u30fc\u30b6\u30fc\u306f\u305d\u308c\u3089\u3092\u524a\u9664\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002SD\u30ab\u30fc\u30c9\u304c\u5229\u7528\u53ef\u80fd\u304b\u3069\u3046\u304b\u3001\u307e\u305f\u66f8\u304d\u8fbc\u307f\u53ef\u80fd\u304b\u3069\u3046\u304b\u3092\u78ba\u8a8d\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u5916\u90e8\u30b9\u30c8\u30ec\u30fc\u30b8\u304c\u5229\u7528\u53ef\u80fd\u3067\u3042\u308b\u3053\u3068\u3092\u78ba\u8a8d\u3057\u305f\u5f8c\u306b\u521d\u3081\u3066\u66f8\u304d\u8fbc\u3080\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u305d\u3046\u3067\u306a\u3044\u5834\u5408\u3001\u4fdd\u5b58\u30dc\u30bf\u30f3\u306f\u7121\u52b9\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n
\u307e\u305a\u3001\u30e6\u30fc\u30b6\u30fc\u306eSD\u30ab\u30fc\u30c9\u3078\u306e\u30c7\u30fc\u30bf\u306e\u8aad\u307f\u66f8\u304d\u8a31\u53ef\u304c\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306b\u3042\u308b\u304b\u78ba\u8a8d\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002AndroidManifest.xml\u3092\u958b\u3044\u3066\u3001\u4ee5\u4e0b\u306e\u8a31\u53ef\u3092\u8ffd\u52a0\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n
<uses-permission android:name=\"android.permission.WRITE_EXTERNAL_STORAGE\"\/>\r\n<uses-permission android:name=\"android.permission.READ_EXTERNAL_STORAGE\"\/>\r\n<\/code><\/pre>\n\u307e\u305f\u3001\u5916\u90e8\u30b9\u30c8\u30ec\u30fc\u30b8\u306f\u3001\u30e6\u30fc\u30b6\u30fc\u304cUSB\u30b9\u30c8\u30ec\u30fc\u30b8\u3068\u3057\u3066\u30de\u30a6\u30f3\u30c8\u3057\u305f\u3053\u3068\u3067\u5229\u7528\u3055\u308c\u3066\u3044\u308b\u53ef\u80fd\u6027\u3082\u3042\u308a\u307e\u3059\u3002\u305d\u306e\u305f\u3081\u3001\u5916\u90e8\u30b9\u30c8\u30ec\u30fc\u30b8\u304c\u5229\u7528\u53ef\u80fd\u3067\u3042\u308a\u3001\u8aad\u307f\u53d6\u308a\u5c02\u7528\u3067\u306f\u306a\u3044\u304b\u3092\u78ba\u8a8d\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n
if (!isExternalStorageAvailable() || isExternalStorageReadOnly()) { \r\n saveButton.setEnabled(false);\r\n } \r\n\r\nprivate static boolean isExternalStorageReadOnly() { \r\n String extStorageState = Environment.getExternalStorageState(); \r\n if (Environment.MEDIA_MOUNTED_READ_ONLY.equals(extStorageState)) { \r\n return true; \r\n } \r\n return false; \r\n } \r\n \r\n private static boolean isExternalStorageAvailable() { \r\n String extStorageState = Environment.getExternalStorageState(); \r\n if (Environment.MEDIA_MOUNTED.equals(extStorageState)) { \r\n return true; \r\n } \r\n return false; \r\n } \r\n<\/code><\/pre>\ngetExternalStorageState()\u306f\u3001\u5916\u90e8\u30b9\u30c8\u30ec\u30fc\u30b8\u304c\u73fe\u5728\u5229\u7528\u53ef\u80fd\u304b\u3069\u3046\u304b\u3092\u5224\u65ad\u3059\u308b\u305f\u3081\u306eEnvironment\u306e\u9759\u7684\u30e1\u30bd\u30c3\u30c9\u3067\u3059\u3002\u6761\u4ef6\u304c\u507d\u306e\u5834\u5408\u3001\u4fdd\u5b58\u30dc\u30bf\u30f3\u3092\u7121\u52b9\u306b\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n
\u30a2\u30f3\u30c9\u30ed\u30a4\u30c9\u5916\u90e8\u30b9\u30c8\u30ec\u30fc\u30b8\u306e\u4f8b\u984c\u30b3\u30fc\u30c9<\/h3>\n
activity_main.xml\u306e\u30ec\u30a4\u30a2\u30a6\u30c8\u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u5b9a\u7fa9\u3055\u308c\u3066\u3044\u307e\u3059\uff1a<\/p>\n
<?xml version=\"1.0\" encoding=\"utf-8\"?>\r\n<LinearLayout xmlns:android=\"https:\/\/schemas.android.com\/apk\/res\/android\"\r\n android:layout_width=\"fill_parent\" android:layout_height=\"fill_parent\"\r\n android:orientation=\"vertical\">\r\n\r\n <TextView android:layout_width=\"fill_parent\"\r\n android:layout_height=\"wrap_content\"\r\n android:text=\"Reading and Writing to External Storage\"\r\n android:textSize=\"24sp\"\/>\r\n\r\n <EditText android:id=\"@+id\/myInputText\"\r\n android:layout_width=\"match_parent\"\r\n android:layout_height=\"wrap_content\"\r\n android:ems=\"10\" android:lines=\"5\"\r\n android:minLines=\"3\" android:gravity=\"top|left\"\r\n android:inputType=\"textMultiLine\">\r\n\r\n <requestFocus \/>\r\n <\/EditText>\r\n\r\n <LinearLayout\r\n android:layout_width=\"match_parent\" android:layout_height=\"wrap_content\"\r\n android:orientation=\"horizontal\"\r\n android:weightSum=\"1.0\"\r\n android:layout_marginTop=\"20dp\">\r\n\r\n <Button android:id=\"@+id\/saveExternalStorage\"\r\n android:layout_width=\"match_parent\"\r\n android:layout_height=\"wrap_content\"\r\n android:text=\"SAVE\"\r\n android:layout_weight=\"0.5\"\/>\r\n\r\n <Button android:id=\"@+id\/getExternalStorage\"\r\n android:layout_width=\"match_parent\"\r\n android:layout_height=\"wrap_content\"\r\n android:layout_weight=\"0.5\"\r\n android:text=\"READ\" \/>\r\n\r\n <\/LinearLayout>\r\n\r\n <TextView android:id=\"@+id\/response\"\r\n android:layout_width=\"wrap_content\"\r\n android:layout_height=\"wrap_content\" android:padding=\"5dp\"\r\n android:text=\"\"\r\n android:textAppearance=\"?android:attr\/textAppearanceMedium\" \/>\r\n\r\n<\/LinearLayout>\r\n<\/code><\/pre>\n\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u3001\u30cd\u30a4\u30c6\u30a3\u30d6\u306e\u65e5\u672c\u8a9e\u3067\u8a00\u3044\u63db\u3048\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n
\u524d\u306e\u30c1\u30e5\u30fc\u30c8\u30ea\u30a2\u30eb\u3067\u306f\u3001Android\u30c8\u30fc\u30b9\u30c8\u304c\u8868\u793a\u3055\u308c\u3066\u3044\u305f\u306e\u306b\u5bfe\u3057\u3001\u3053\u3053\u3067\u306f\u4fdd\u5b58\/\u8aad\u307f\u8fbc\u307f\u306e\u5fdc\u7b54\u3092\u5916\u90e8\u30b9\u30c8\u30ec\u30fc\u30b8\u306b\u4fdd\u5b58\/\u8aad\u307f\u8fbc\u307f\u3059\u308b\u305f\u3081\u306e\u30dc\u30bf\u30f3\u4ee5\u5916\u306b\u3001\u30c6\u30ad\u30b9\u30c8\u30d3\u30e5\u30fc\u306b\u8868\u793a\u3057\u307e\u3059\u3002\u4ee5\u4e0b\u306bMainActivity.java\u30af\u30e9\u30b9\u304c\u8a18\u8f09\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n
package com.scdev.externalstorage;\r\n\r\nimport java.io.BufferedReader;\r\nimport java.io.DataInputStream;\r\nimport java.io.File;\r\nimport java.io.FileInputStream;\r\nimport java.io.FileOutputStream;\r\nimport java.io.IOException;\r\nimport java.io.InputStreamReader;\r\nimport android.os.Bundle;\r\nimport android.app.Activity;\r\nimport android.os.Environment;\r\nimport android.view.View;\r\nimport android.view.View.OnClickListener;\r\nimport android.widget.Button;\r\nimport android.widget.EditText;\r\nimport android.widget.TextView;\r\n\r\n\r\npublic class MainActivity extends Activity {\r\n EditText inputText;\r\n TextView response;\r\n Button saveButton,readButton;\r\n\r\n private String filename = \"SampleFile.txt\";\r\n private String filepath = \"MyFileStorage\";\r\n File myExternalFile;\r\n String myData = \"\";\r\n\r\n @Override\r\n protected void onCreate(Bundle savedInstanceState) {\r\n super.onCreate(savedInstanceState);\r\n setContentView(R.layout.activity_main);\r\n\r\n inputText = (EditText) findViewById(R.id.myInputText);\r\n response = (TextView) findViewById(R.id.response);\r\n\r\n\r\n saveButton =\r\n (Button) findViewById(R.id.saveExternalStorage);\r\n saveButton.setOnClickListener(new OnClickListener() {\r\n @Override\r\n public void onClick(View v) {\r\n try {\r\n FileOutputStream fos = new FileOutputStream(myExternalFile);\r\n fos.write(inputText.getText().toString().getBytes());\r\n fos.close();\r\n } catch (IOException e) {\r\n e.printStackTrace();\r\n }\r\n inputText.setText(\"\");\r\n response.setText(\"SampleFile.txt saved to External Storage...\");\r\n }\r\n });\r\n\r\n readButton = (Button) findViewById(R.id.getExternalStorage);\r\n readButton.setOnClickListener(new OnClickListener() {\r\n @Override\r\n public void onClick(View v) {\r\n try {\r\n FileInputStream fis = new FileInputStream(myExternalFile);\r\n DataInputStream in = new DataInputStream(fis);\r\n BufferedReader br =\r\n new BufferedReader(new InputStreamReader(in));\r\n String strLine;\r\n while ((strLine = br.readLine()) != null) {\r\n myData = myData + strLine;\r\n }\r\n in.close();\r\n } catch (IOException e) {\r\n e.printStackTrace();\r\n }\r\n inputText.setText(myData);\r\n response.setText(\"SampleFile.txt data retrieved from Internal Storage...\");\r\n }\r\n });\r\n\r\n if (!isExternalStorageAvailable() || isExternalStorageReadOnly()) {\r\n saveButton.setEnabled(false);\r\n }\r\n else {\r\n myExternalFile = new File(getExternalFilesDir(filepath), filename);\r\n }\r\n\r\n\r\n }\r\n private static boolean isExternalStorageReadOnly() {\r\n String extStorageState = Environment.getExternalStorageState();\r\n if (Environment.MEDIA_MOUNTED_READ_ONLY.equals(extStorageState)) {\r\n return true;\r\n }\r\n return false;\r\n }\r\n\r\n private static boolean isExternalStorageAvailable() {\r\n String extStorageState = Environment.getExternalStorageState();\r\n if (Environment.MEDIA_MOUNTED.equals(extStorageState)) {\r\n return true;\r\n }\r\n return false;\r\n }\r\n\r\n\r\n}\r\n<\/code><\/pre>\n\n- \n
Environment.getExternalStorageState() : “\/mnt\/sdcard”\u306e\u3088\u3046\u306a\u5185\u90e8SD\u30de\u30a6\u30f3\u30c8\u30dd\u30a4\u30f3\u30c8\u3078\u306e\u30d1\u30b9\u3092\u8fd4\u3057\u307e\u3059\u3002<\/ol>\n<\/li>\n<\/ol>\n <\/p>\n
getExternalFilesDir() : SD\u30ab\u30fc\u30c9\u5185\u306eAndroid\/data\/data\/application_package\/\u5185\u306e\u30d5\u30a1\u30a4\u30eb\u30d5\u30a9\u30eb\u30c0\u3078\u306e\u30d1\u30b9\u3092\u8fd4\u3057\u307e\u3059\u3002\u3053\u306e\u30d5\u30a9\u30eb\u30c0\u306b\u306f\u3001\u30a2\u30d7\u30ea\u3067\u5fc5\u8981\u306a\u30d5\u30a1\u30a4\u30eb\uff08\u30a6\u30a7\u30d6\u304b\u3089\u30c0\u30a6\u30f3\u30ed\u30fc\u30c9\u3055\u308c\u305f\u753b\u50cf\u3084\u30ad\u30e3\u30c3\u30b7\u30e5\u30d5\u30a1\u30a4\u30eb\u306a\u3069\uff09\u3092\u4fdd\u5b58\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002\u30a2\u30d7\u30ea\u304c\u30a2\u30f3\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb\u3055\u308c\u308b\u3068\u3001\u3053\u306e\u30d5\u30a9\u30eb\u30c0\u306b\u4fdd\u5b58\u3055\u308c\u305f\u30c7\u30fc\u30bf\u306f\u524a\u9664\u3055\u308c\u307e\u3059\u3002<\/ol>\n\u307e\u305f\u3001\u5916\u90e8\u30b9\u30c8\u30ec\u30fc\u30b8\u304c\u5229\u7528\u3067\u304d\u306a\u3044\u5834\u5408\u306f\u3001\u5148\u306b\u3053\u306e\u30c1\u30e5\u30fc\u30c8\u30ea\u30a2\u30eb\u3067\u8aac\u660e\u3057\u305fif\u6761\u4ef6\u3092\u4f7f\u7528\u3057\u3066\u4fdd\u5b58\u30dc\u30bf\u30f3\u3092\u7121\u52b9\u306b\u3057\u307e\u3059\u3002\u4ee5\u4e0b\u306f\u3001\u30d5\u30a1\u30a4\u30eb\u306b\u30c7\u30fc\u30bf\u3092\u66f8\u304d\u8fbc\u3093\u3067\u304b\u3089\u8aad\u307f\u8fbc\u3080\u305f\u3081\u306b\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u304cAndroid\u30a8\u30df\u30e5\u30ec\u30fc\u30bf\u3067\u5b9f\u884c\u3055\u308c\u3066\u3044\u308b\u72b6\u614b\u3067\u3059\u3002 \u6ce8\u610f\uff1aAndroid\u30a8\u30df\u30e5\u30ec\u30fc\u30bf\u304c\u4e0b\u306eAVD\u306e\u30a4\u30e1\u30fc\u30b8\u30c0\u30a4\u30a2\u30ed\u30b0\u306b\u8868\u793a\u3055\u308c\u308bSD\u30ab\u30fc\u30c9\u3092\u6301\u3064\u3088\u3046\u306b\u69cb\u6210\u3055\u308c\u3066\u3044\u308b\u3053\u3068\u3092\u78ba\u8a8d\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u30c4\u30fc\u30eb->Android->Android Virtual Device\u306b\u79fb\u52d5\u3057\u3001\u8a2d\u5b9a\u3092\u7de8\u96c6->\u8a73\u7d30\u8a2d\u5b9a\u3092\u8868\u793a\u3057\u307e\u3059\u3002\u3053\u308c\u3067\u3053\u306e\u30c1\u30e5\u30fc\u30c8\u30ea\u30a2\u30eb\u306f\u7d42\u4e86\u3067\u3059\u3002\u6b21\u306e\u30c1\u30e5\u30fc\u30c8\u30ea\u30a2\u30eb\u3067\u306f\u3001Shared Preferences\u3092\u4f7f\u7528\u3057\u305f\u30b9\u30c8\u30ec\u30fc\u30b8\u306b\u3064\u3044\u3066\u8aac\u660e\u3057\u307e\u3059\u3002\u6700\u7d42\u7684\u306aAndroid External Storage Project\u306f\u3001\u4ee5\u4e0b\u306e\u30ea\u30f3\u30af\u304b\u3089\u30c0\u30a6\u30f3\u30ed\u30fc\u30c9\u3067\u304d\u307e\u3059\u3002<\/p>\n
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