直接上代码：
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
|
package com.example.test;import java.io.File;import java.io.FileNotFoundException;import java.io.FileOutputStream;import java.io.IOException;import android.os.Bundle;import android.os.Environment;import android.app.Activity;import android.widget.Toast;public class MainActivity extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); //要保存的文件名和文件内容 String fileName = "test.txt"; String content = "This is a test."; //判断sdcard是否存在 String state = Environment.getExternalStorageState(); if(state.equals(Environment.MEDIA_MOUNTED)) { //获取SDCard目录 File sdcardPath = Environment.getExternalStorageDirectory(); File file = new File(sdcardPath, fileName); FileOutputStream fos; try { fos = new FileOutputStream(file); fos.write(content.getBytes()); fos.close(); } catch (FileNotFoundException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } Toast.makeText(this, "保存成功", Toast.LENGTH_SHORT).show(); } else { Toast.makeText(this, "sdcard不存在获取不可写入", Toast.LENGTH_SHORT).show(); } }} |
