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因为external storage可能是不可用的,比如遇到SD卡被拔出等情况时。因此在访问之前应对其可用性进行检查。我们可以通过执行 getExternalStorageState()来查询external storage的状态。若返回状态为MEDIA_MOUNTED, 则可以读写。
代码:- /* Checks if external storage is available for read and write */
- public boolean isExternalStorageWritable() {
- String state = Environment.getExternalStorageState();
- if (Environment.MEDIA_MOUNTED.equals(state)) {
- return true;
- }
- return false;
- }
-
- /* Checks if external storage is available to at least read */
- public boolean isExternalStorageReadable() {
- String state = Environment.getExternalStorageState();
- if (Environment.MEDIA_MOUNTED.equals(state) ||
- Environment.MEDIA_MOUNTED_READ_ONLY.equals(state)) {
- return true;
- }
- return false;
- }
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