Android编程实现向SD卡写入数据的方法

/*** 向sdcard中写入文件* @param filename 文件名* @param content 文件内容*/public void saveToSDCard(String filename,String content) throws Exception{  File file=new File("/mnt/sdcard", filename);  OutputStream out=new FileOutputStream(file);  out.write(content.getBytes());  out.close();}

/*** 向sdcard中写入文件* @param filename 文件名* @param content 文件内容*/public void saveToSDCard(String filename,String content) throws Exception{  File file=new File(Environment.getExternalStorageDirectory(), filename);  OutputStream out=new FileOutputStream(file);  out.write(content.getBytes());  out.close();}

<!-- 在SDCard中创建于删除文件的权限 --><uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"/><!-- 往SDCard中写入数据的权限 --><uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>

//向SDCard中保存String en=Environment.getExternalStorageState();//获取SDCard状态,如果SDCard插入了手机且为非写保护状态if(en.equals(Environment.MEDIA_MOUNTED)){ try {  service.saveToSDCard(filename, content);  Toast.makeText(getApplicationContext(), "保存成功", 1).show(); } catch (Exception e) {  Toast.makeText(getApplicationContext(), "保存失败", 1).show(); }}else{ //提示用户SDCard不存在或者为写保护状态 Toast.makeText(getApplicationContext(), "SDCard不存在或者为写保护状态", 1).show();}