安卓文件管理
我使用下面的代码将文件写入 SD 卡并读取其中的内容：
try {
if (root.canWrite())
{
File rootdir = Environment.getExternalStorageDirectory();
File yourFile = new File(rootdir, "tomato50.txt");
FileWriter filewriter = new FileWriter(file,true);
BufferedWriter out = new BufferedWriter(filewriter);
for (int k=0; k<assignArr.size(); k++)
{
out.write(assignArr.get(k) + "\n");
Toast.makeText(MainActivity.this, "out: " + assignArr.get(k), Toast.LENGTH_LONG).show();
}
out.close();
}
} catch (IOException e) {
Log.e("TAG", "Could not write file " + e.getMessage());
try {
File rootdir = Environment.getExternalStorageDirectory();
File yourFile = new File(rootdir, "tomato50.txt");
FileReader filereader = new FileReader(yourFile);
BufferedReader br = new BufferedReader(filereader);
String line;
while((line = br.readLine()) != null)
{
assignArrBe.add(line);
Toast.makeText(MainActivity.this, "Read from file: " + line, Toast.LENGTH_LONG).show();
}
br.close();
}
catch (IOException e)
{
e.printStackTrace();
}
问题是：如何写入手机内存并从中读取内容？
i use the code below to write a file to the sd card and read the content of it:
try {
if (root.canWrite())
{
File rootdir = Environment.getExternalStorageDirectory();
File yourFile = new File(rootdir, "tomato50.txt");
FileWriter filewriter = new FileWriter(file,true);
BufferedWriter out = new BufferedWriter(filewriter);
for (int k=0; k<assignArr.size(); k++)
{
out.write(assignArr.get(k) + "\n");
Toast.makeText(MainActivity.this, "out: " + assignArr.get(k), Toast.LENGTH_LONG).show();
}
out.close();
}
} catch (IOException e) {
Log.e("TAG", "Could not write file " + e.getMessage());
try {
File rootdir = Environment.getExternalStorageDirectory();
File yourFile = new File(rootdir, "tomato50.txt");
FileReader filereader = new FileReader(yourFile);
BufferedReader br = new BufferedReader(filereader);
String line;
while((line = br.readLine()) != null)
{
assignArrBe.add(line);
Toast.makeText(MainActivity.this, "Read from file: " + line, Toast.LENGTH_LONG).show();
}
br.close();
}
catch (IOException e)
{
e.printStackTrace();
}
Question is: how can i write to the phone memory and read from it?
如果你对这篇内容有疑问，欢迎到本站社区发帖提问 参与讨论，获取更多帮助，或者扫码二维码加入 Web 技术交流群。
绑定邮箱获取回复消息
由于您还没有绑定你的真实邮箱，如果其他用户或者作者回复了您的评论，将不能在第一时间通知您！
发布评论
评论（2）
您需要root您的手机才能获得对任何手机文件夹的写入权限。
如果您想要写入特定于应用程序的内部存储，那么您可以遵循以下指南：
You will need to root your phone in order to get write access to any phone folder.
If what you want is to write in the app-specific internal storage, then you can follow this guide: http://developer.android.com/guide/topics/data/data-storage.html#filesInternal
首先，您必须在清单文件中添加以下行：
如果还不够，您能更详细地解释问题吗？
First of all you have to put in your manifest file this line:
If it is not enough, can you explain the problem with more details?