package?com.et.myfiledemo1;

import?android.support.v7.app.AppCompatActivity;
import?android.os.Bundle;
import?android.util.Log;
import?android.widget.Toast;

import?java.io.File;
import?java.io.IOException;

public?class?MainActivity?extends?AppCompatActivity?{

????@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?{
????????????????//Toast.makeText(this,"文件不存在",Toast.LENGTH_SHORT).show();
????????????????Log.i("info","文件不存在");
????????????????file.createNewFile();
????????????????//Toast.makeText(this,"創建完畢",Toast.LENGTH_SHORT).show();
????????????????Log.i("info","文件創建完畢");
????????????}?catch?(IOException?e)?{
????????????????e.printStackTrace();
????????????????//Toast.makeText(this,"創建失敗",Toast.LENGTH_SHORT).show();
????????????????Log.i("info","創建失敗");
????????????}
????????}else{
????????????Toast.makeText(this,"文件已經存在",Toast.LENGTH_SHORT).show();
????????}
????}
}