Android中判断SD卡状态

String status = Environment.getExternalStorageState();
if (status.equalsIgnoreCase(Environment.MEDIA_MOUNTED)) {
Toast.makeText(TechoLite.this, "SD卡存在", Toast.LENGTH_LONG).show();
// 此时SD是可读写的
} else if (status.equalsIgnoreCase(Environment.MEDIA_MOUNTED_READ_ONLY)) {
Toast.makeText(TechoLite.this, "虽然SD存在，但是为只读状态", Toast.LENGTH_LONG).show();
} else if (status.equalsIgnoreCase(Environment.MEDIA_REMOVED)) {
Toast.makeText(TechoLite.this, "SD不存在", Toast.LENGTH_LONG).show();
} else if (status.equalsIgnoreCase(Environment.MEDIA_SHARED)) {
Toast.makeText(TechoLite.this, "虽然SD卡存在，但是正与PC等相连接", Toast.LENGTH_LONG).show();
} else if (status.equalsIgnoreCase(Environment.MEDIA_BAD_REMOVAL)) {
Toast.makeText(TechoLite.this, "SD卡在挂载状态下被错误取出", Toast.LENGTH_LONG).show();
} else if (status.equalsIgnoreCase(Environment.MEDIA_CHECKING)) {
Toast.makeText(TechoLite.this, "正在检查SD卡", Toast.LENGTH_LONG).show();
} else if (status.equalsIgnoreCase(Environment.MEDIA_NOFS)) {
Toast.makeText(TechoLite.this, "虽然SD卡存在，但其文件系统不被支持", Toast.LENGTH_LONG).show();
} else if (status.equalsIgnoreCase(Environment.MEDIA_UNMOUNTABLE)) {
Toast.makeText(TechoLite.this, "虽然SD卡存在，但是无法被挂载", Toast.LENGTH_LONG).show();
} else if (status.equalsIgnoreCase(Environment.MEDIA_UNMOUNTED)) {
Toast.makeText(TechoLite.this, "虽然SD卡存在，但是未被挂载", Toast.LENGTH_LONG).show();
} else {
Toast.makeText(TechoLite.this, "其他原因", Toast.LENGTH_LONG).show();
}