Android(安卓)内部存储外部存储

String filesDir_toString = getFilesDir().toString();

String cacheDir_toString = getCacheDir().toString()

String external_cacheDir_toString = getExternalCacheDir().toString()

String custom = getExternalFilesDir("custom").toString();

下面是测试代码

public class Main2Activityextends AppCompatActivity {

private static StringTAG ="Shark";

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main2);

/**

* 获取当前程序路径应用在内存上的目录 :/data/data/{packageName}/files

* 获取内置存储下的文件目录，可以用来保存不能公开给其他应用的一些敏感数据如用户个人信息。

* /data/data/应用包名/files/[6.0以下]

* /data/user/0/应用包名/files/[6.0以上]=[Cocos2dx下的getWritablePath()]

// /data/user/0/{packageName}/files

String filesDir_toString = getFilesDir().toString();

// /data/user/0/{packageName}/files

String filesDir_getAbsolutePath = getFilesDir().getAbsolutePath();

// /data/user/0/{packageName}

String filesDir_getParent = getFilesDir().getParent();

// /data/user/0/{packageName}/files

String filesDir_getPath = getFilesDir().getPath();

try {

// /data/data/{packageName}/files

String filesDir_getCanonicalPath = getFilesDir().getCanonicalPath();

Log.i(TAG, " =======================================================================");

Log.i(TAG, " filesDir_getCanonicalPath===" + filesDir_getCanonicalPath);

}catch (IOException e) {

e.printStackTrace();

}

// files

String filesDir_getName = getFilesDir().getName();

// true

boolean filesDir_canExecute = getFilesDir().canExecute();

// true

boolean filesDir_canRead = getFilesDir().canRead();

// true

boolean filesDir_canWrite = getFilesDir().canWrite();

// -----------------------------------------------------------------------------------------

Log.i(TAG, " filesDir_toString ===" + filesDir_toString);

Log.i(TAG, " filesDir_getAbsolutePath===" + filesDir_getAbsolutePath);

Log.i(TAG, " filesDir_getName===" + filesDir_getName);

Log.i(TAG, " filesDir_getParent===" + filesDir_getParent);

Log.i(TAG, " filesDir_getPath ===" + filesDir_getPath);

Log.i(TAG, " filesDir_canExecute===" + filesDir_canExecute);

Log.i(TAG, " filesDir_canRead===" + filesDir_canRead);

Log.i(TAG, " filesDir_canWrite===" + filesDir_canWrite);

Log.i(TAG, " =======================================================================\n\n\n");

// =========================================================================================

/**

* 应用的在内存上的缓存目录 :/data/data/{packageName}/cache

* 获取内置存储下的缓存目录，可以用来保存一些缓存文件如图片，当内置存储的空间不足时将系统自动被清除。

* /data/data/应用包名/cache/[6.0以下]

* /data/user/0/应用包名/cache/[6.0以上]

// /data/user/0/{packageName}/cache

String cacheDir_toString = getCacheDir().toString();

// /data/user/0/{packageName}/cache

String cacheDir_getAbsolutePath = getCacheDir().getAbsolutePath();

// /data/user/0/{packageName}

String cacheDir_getParent = getCacheDir().getParent();

// /data/user/0/{packageName}/cache

String cacheDir_getPath = getCacheDir().getPath();

try {

// /data/data/{packageName}/cache

String cacheDir_getCanonicalPath = getCacheDir().getCanonicalPath();

Log.i(TAG, " =======================================================================");

Log.i(TAG, " cacheDir_getCanonicalPath===" + cacheDir_getCanonicalPath);

}catch (IOException e) {

e.printStackTrace();

}

// cache

String cacheDir_getName = getCacheDir().getName();

// true

boolean cacheDir_canExecute = getCacheDir().canExecute();

// true

boolean cacheDir_canRead = getCacheDir().canRead();

// true

boolean cacheDir_canWrite = getCacheDir().canWrite();

// -----------------------------------------------------------------------------------------

Log.i(TAG, " cacheDir_toString ===" + cacheDir_toString);

Log.i(TAG, " cacheDir_getAbsolutePath===" + cacheDir_getAbsolutePath);

Log.i(TAG, " cacheDir_getName===" + cacheDir_getName);

Log.i(TAG, " cacheDir_getParent===" + cacheDir_getParent);

Log.i(TAG, " cacheDir_getPath ===" + cacheDir_getPath);

Log.i(TAG, " cacheDir_canExecute===" + cacheDir_canExecute);

Log.i(TAG, " cacheDir_canRead===" + cacheDir_canRead);

Log.i(TAG, " cacheDir_canWrite===" + cacheDir_canWrite);

Log.i(TAG, " =======================================================================");

// =========================================================================================

/**

* 应用在外部存储上的目录 :/storage/emulated/0/Android/data/{packageName}/files/Movies

* 这个需要传入一个String type

* 同上面一样的，这里的文件会随着App卸载而被删除，也可以由用户手动在设置界面里面清除。

* 既然是SD卡上的目录，那么是可以被其他的应用读取到的，所以这个目录下，不应该存放用户的敏感信息。

try {

// /storage/emulated/0/Android/data/{packageName}/files/Music

String music = getExternalFilesDir(Environment.DIRECTORY_MUSIC).toString();

String pictures = getExternalFilesDir(Environment.DIRECTORY_PICTURES).toString();

String movies = getExternalFilesDir(Environment.DIRECTORY_MOVIES).toString();

String download = getExternalFilesDir(Environment.DIRECTORY_DOWNLOADS).toString();

String dcim = getExternalFilesDir(Environment.DIRECTORY_DCIM).toString();

// 自定义

String custom = getExternalFilesDir("custom").toString();

Log.i(TAG, "=======================================================================");

Log.i(TAG, "music ===" + music);

Log.i(TAG, "pictures ===" + pictures);

Log.i(TAG, "movies ===" + movies);

Log.i(TAG, "download ===" + download);

Log.i(TAG, "dcim ===" + dcim);

Log.i(TAG, "custom ===" + custom);

Log.i(TAG, "=======================================================================");

}catch (Exception e) {

}

// =========================================================================================

/**

* 应用的在内存上的缓存目录 :/data/data/{packageName}/cache

* 获取内置存储下的缓存目录，可以用来保存一些缓存文件如图片，当内置存储的空间不足时将系统自动被清除。

* 同上面一样的，这里的文件会随着App卸载而被删除，也可以由用户手动在设置界面里面清除。

* 既然是SD卡上的目录，那么是可以被其他的应用读取到的，所以这个目录下，不应该存放用户的敏感信息。

// /storage/emulated/0/Android/data/{packageName}/cache

String external_cacheDir_toString = getExternalCacheDir().toString();

String external_cacheDir_getAbsolutePath = getExternalCacheDir().getAbsolutePath();

String external_cacheDir_getParent = getExternalCacheDir().getParent();

String external_cacheDir_getPath = getExternalCacheDir().getPath();

try {

String external_cacheDir_getCanonicalPath = getExternalCacheDir().getCanonicalPath();

Log.i(TAG, " =======================================================================");

Log.i(TAG, " external_cacheDir_getCanonicalPath===" + external_cacheDir_getCanonicalPath);

}catch (IOException e) {

e.printStackTrace();

}

// cache

String external_cacheDir_getName = getExternalCacheDir().getName();

// true

boolean external_cacheDir_canExecute = getExternalCacheDir().canExecute();

// true

boolean external_cacheDir_canRead = getExternalCacheDir().canRead();

// true

boolean external_cacheDir_canWrite = getExternalCacheDir().canWrite();

// -----------------------------------------------------------------------------------------

Log.i(TAG, " external_cacheDir_toString ===" + external_cacheDir_toString);

Log.i(TAG, " external_cacheDir_getAbsolutePath===" + external_cacheDir_getAbsolutePath);

Log.i(TAG, " external_cacheDir_getName===" + external_cacheDir_getName);

Log.i(TAG, " external_cacheDir_getParent===" + external_cacheDir_getParent);

Log.i(TAG, " external_cacheDir_getPath ===" + external_cacheDir_getPath);

Log.i(TAG, " external_cacheDir_canExecute===" + external_cacheDir_canExecute);

Log.i(TAG, " external_cacheDir_canRead===" + external_cacheDir_canRead);

Log.i(TAG, " external_cacheDir_canWrite===" + external_cacheDir_canWrite);

Log.i(TAG, " =======================================================================");

// String filePath = getExternalFilesDir("custom") + File.separator + "fileUtilDir" + File.separator + "file.txt";

// Log.w(TAG,"filePath="+filePath);

// String content = "将字符串内容添加到文本文件中";

// boolean writeFileState = FileUtils.writeFile(filePath,content);

// Log.w(TAG,"writeFileState="+writeFileState);

// =========================================================================================

// /data 返回用户数据目录。内置存储 data 分区根目录

String dataDirectory = Environment.getDataDirectory().toString();

// /data/cache 返回下载/缓存内容目录。

String getDownloadCacheDirectory = Environment.getDownloadCacheDirectory().toString();

// /system 返回包含核心Android操作系统的“系统”分区的根目录。始终以只读形式存在和挂载。

// 系统分区

String getRootDirectory = Environment.getRootDirectory().toString();

// /storage/emulated/0 返回主共享/外部存储目录。获取外置内存跟目录

String getExternalStorageDirectory = Environment.getExternalStorageDirectory().toString();

// mounted 返回主共享/外部存储媒体的当前状态。

String getExternalStorageState = Environment.getExternalStorageState();

}

相关资料 1.https://blog.csdn.net/csdn_aiyang/article/details/80665185

2.https://blog.csdn.net/nimeghbia/article/details/64121432

3.https://blog.csdn.net/ArisKing/article/details/88263183

4.https://blog.csdn.net/itermeng/article/details/79423035

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