我希望我在应用程序的“编辑”文本字段中编写的所有内容都自动保存在.txt文件中。这样我就可以直接从那里检索此文件,并通过一个按钮将其发送给任何人。
我的问题是如何直接保存为.txt格式。
最佳答案
更改文本后,此代码段会将您的文本复制到字符串中,并调用一个函数来写入应用程序的私有文件目录。
String YourTextString;
YourTextField.addTextChangedListener(new TextWatcher() {
@Override
public void onTextChanged(CharSequence arg0, int arg1, int arg2,int arg3) {
YourTextString = YourTextField.getText().toString();
writeToFile(YourTextString);
}
@Override
public void afterTextChanged(Editable s) {
}
@Override
public void beforeTextChanged(CharSequence s, int start, int count,int after) {
}
});
public void writeToFile(String data) {
try {
OutputStreamWriter MyOutputStreamWriter = new OutputStreamWriter(mContext.openFileOutput("YourFileName.txt", Context.MODE_PRIVATE));
MyOutputStreamWriter.append(data);
MyOutputStreamWriter.close();
}
catch (IOException e) {
Log.e("Exception", "File write failed: " + e.toString());
}
}
编辑:
如果要读取文件,则可以使用此功能(如果path参数为空,则代码将从私有文件目录中读取文件,如果提供路径,它将读取您指定的文件):
public String readFromFile(String path) {
String ret = "";
if(path==""){
try {
InputStream inputStream = mContext.openFileInput(FileName);
if ( inputStream != null ) {
InputStreamReader inputStreamReader = new InputStreamReader(inputStream);
BufferedReader bufferedReader = new BufferedReader(inputStreamReader);
String receiveString = "";
StringBuilder stringBuilder = new StringBuilder();
while ( (receiveString = bufferedReader.readLine()) != null ) {
stringBuilder.append(receiveString).append("\n");
}
inputStream.close();
ret = stringBuilder.toString();
}
}
catch (FileNotFoundException e) {
Log.e("login activity", "File not found: " + e.toString());
} catch (IOException e) {
Log.e("login activity", "Can not read file: " + e.toString());
}
}
else
{
File file = new File(path);
String receiveString = "";
StringBuilder stringBuilder = new StringBuilder();
try {
BufferedReader buf = new BufferedReader(new FileReader(file));
while ( (receiveString = buf.readLine()) != null ) {
stringBuilder.append(receiveString).append("\n");
}
buf.close();
ret = stringBuilder.toString();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
return ret;
}
关于android - 如何在Android应用程序中将文本字段(用户输入)数据保存在文本文件中,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/22734648/