@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

File file=new File("/mnt/sdcard/test");

if(!file.exists()){

try {

file.createNewFile();

Toast.makeText(MainActivity.this, "文件創建成功！", Toast.LENGTH_SHORT).show();

} catch (IOException e) {

// TODO 自動生成的 catch 塊

e.printStackTrace();

}

}else{

Toast.makeText(MainActivity.this, "文件已存在！", Toast.LENGTH_SHORT).show();

}

//file.delete();?

}