android保存文件到SD卡中

想把文件保存到SD卡中，一定要知道SD卡的路径，有人说可以用File explore来查看，这种方法不太好，因为随着android版本的升级，SD卡的路径可能会发生改变。在1.6的时候SD的路径是/sdCard。后续版本都改成了mnt/sdCard。所有还是使用API来获取：

Environment.getExternalStorageDirectory()

另外，在保存之前要判断SD卡是否已经安装好，并且可读写：

//判断SDcard是否存在并且可读写if(Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)){service.saveToSDCard(filename,filecontent);Toast.makeText(getApplicationContext(), R.string.success, 1).show();}else{Toast.makeText(getApplicationContext(), R.string.sdcarderror, 1).show();}

查看完整代码：

/** * 保存到SD卡 * @param filename * @param filecontent * @throws Exception */public void saveToSDCard(String filename, String filecontent)throws Exception{File file = new File(Environment.getExternalStorageDirectory(),filename);FileOutputStream outStream = new FileOutputStream(file);outStream.write(filecontent.getBytes());outStream.close();}

@Overridepublic void onClick(View v) {EditText filenameText = (EditText)findViewById(R.id.filename);EditText filecontentText = (EditText)findViewById(R.id.filecontent);String filename = filenameText.getText().toString();String filecontent = filecontentText.getText().toString();FileService service = new FileService(getApplicationContext());try {//判断SDcard是否存在并且可读写if(Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)){service.saveToSDCard(filename,filecontent);Toast.makeText(getApplicationContext(), R.string.success, 1).show();}else{Toast.makeText(getApplicationContext(), R.string.sdcarderror, 1).show();}} catch (Exception e) {Toast.makeText(getApplicationContext(), R.string.fail, 1).show();e.printStackTrace();}Toast.makeText(getApplicationContext(), R.string.success, 1).show();}

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