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,"创建完毕",Toast.LENGTH_SHORT).show();
                Log.i("info","文件创建完毕");
            } catch (IOException e) {
                e.printStackTrace();
                //Toast.makeText(this,"创建失败",Toast.LENGTH_SHORT).show();
                Log.i("info","创建失败");
            }
        }else{
            Toast.makeText(this,"文件已经存在",Toast.LENGTH_SHORT).show();
        }
    }
}