代码：Environment.getExternalStorageState();
范例：
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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(); } |
说明：用于判断设备的SD卡的状态。