Android创建文件并输入内容

本代码之适合一些低版本Android

1. 在AndroidManifest.xml添加权限

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"></uses-permission>
    <uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"</uses-permission>

2. 创建文件并输入内容

                String content = "输入的内容";
                InputStream is =new ByteArrayInputStream(content.getBytes());//string转输入流
                File file = new File(Environment.getExternalStorageDirectory().getAbsolutePath()+"/qqpassword2.txt");
                //Log.d("TAG", "file.exists():" + file.exists() + " file.getAbsolutePath():"+ file.getPath());
                file.createNewFile(); //创建文件，一般来说可以对file.exists()进行判断，如果文件存在就可以跳过创建
                FileOutputStream fos = null;  
                fos = new FileOutputStream(file);
                int  length = 0;
                length = is.available();
                byte[] temp = new byte[length];
                int i = 0;
                while (true) {
                    if (!((i = is.read(temp)) > 0)) break;
                        fos.write(temp, 0, i);
                         }
                    fos.close();
                    is.close();
                }