Android下獲取SD卡的狀態并寫入文件到SD卡

下面的代碼通過Environment.getExternalStorageState獲取SD卡的狀態，如果SD卡不存在或者不可用則提示SD卡不可用，如果可用，則寫入數據到SD中的sharejs.com.txt文件

public boolean saveToSD(String tel,String content){
        Boolean result = true;


    if (Environment.getExternalStorageState() != Environment.MEDIA_MOUNTED){
        result = false;
        Toast.makeText(context,"SD卡不可用",Toast.LENGTH_SHORT).show();
        return result;
    }

    try {
        File file = new File(Environment.getExternalStorageDirectory(),"sharejs.com.txt");
        FileOutputStream fos =  new FileOutputStream(file);
        String data = tel +":" + content;
        fos.write(data.getBytes());
        fos.flush();
        fos.close();
    }
    catch(Exception e)
    {
        e.printStackTrace();
        Toast.makeText(context,"保存失敗"+e.toString(),Toast.LENGTH_SHORT).show();
        result = false;
    }
    return result;
}</pre>