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//内部路径
Environment.getDataDirectory()=/data
Environment.getDownloadCacheDirectory()=/cache
Environment.getRootDirectory()=/system
context.getCacheDir()=/data/data/com.penngo.test/cache
context.getFilesDir()=/data/data/com.penngo.test/files
// 存储卡路径
Environment.getExternalStorageDirectory()=/storage/sdcard0
// 可选值DIRECTORY_MUSIC, DIRECTORY_PODCASTS, DIRECTORY_RINGTONES,
// DIRECTORY_ALARMS, DIRECTORY_NOTIFICATIONS, DIRECTORY_PICTURES,
// DIRECTORY_MOVIES, DIRECTORY_DOWNLOADS, or DIRECTORY_DCIM. 不能为null
Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_MUSIC)=/storage/sdcard0/Music
// 与context.getFilesDir(相似，删除应用时会同时删除
context.getExternalFilesDir()=/storage/sdcard0/Android/data/com.penngo.test/files
// 与context.getCacheDir()相似，删除应用时会同时删除
context.getExternalCacheDir()=/storage/sdcard0/Android/data/com.penngo.test/cache
System.getProperty("user.home")=
System.getProperty("java.io.tmpdir")=/data/data/com.penngo.test/cache
new File().getAbsolutePath()=/.
//判断存储卡是否存在
public static boolean isSdCardExist() {
if (Environment.getExternalStorageState().equals(
Environment.MEDIA_MOUNTED)) {//判断是否已经挂载
return true;
}
return false;
}