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我想在外部存储sdCard中创建一个文件并写入它.我已经通过互联网搜索并尝试但没有得到结果,我已经在Android Manifest文件中添加了权限,我在模拟器上这样做,我正在尝试下面的代码和获取ERRR","无法创建文件".

btnWriteSDFile = (Button) findViewById(R.id.btnWriteSDFile);
btnWriteSDFile.setOnClickListener(new OnClickListener() {
    //private Throwable e;

    @Override
    public void onClick(View v) {
        // write on SD card file data from the text box
        try {
            File myFile = new File("/sdcard/mysdfile.txt");
            myFile.createNewFile();
            FileOutputStream fOut = new FileOutputStream(myFile);
            OutputStreamWriter myOutWriter = new OutputStreamWriter(fOut);
            myOutWriter.append(txtData.getText());
            myOutWriter.close();
            fOut.close();

        } catch (Exception e) {
              Log.e("ERRR", "Could not create file",e);
        } 
    }// onClick
}); // btnWriteSDFile