Android下获取SD卡的状态并写入文件到SD卡详解编程语言

下面的代码通过Environment.getExternalStorageState获取SD卡的状态，如果SD卡不存在或者不可用则提示SD卡不可用，如果可用，则写入数据到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,"保存失败"+e.toString(),Toast.LENGTH_SHORT).show(); 
            result = false; 
        } 
        return result; 
    }