[英]How to read line by line from a file in Android Studio using InputStreamReader
我現在可以讀取文件,但是對於如何逐行讀取字符串以運行我創建的解析器感到困惑。 任何的意見都將會有幫助。
public void ReadBtn() {
char[] inputBuffer = new char[READ_BLOCK_SIZE];
int charRead;
String s = "";
int READ_BLOCK_SIZE = 100;
//reading text from file
try {
FileInputStream fileIn = openFileInput("mytextfile.txt");
InputStreamReader InputRead = new InputStreamReader(fileIn);
BufferedReader BR = new BufferedReader(InputRead);
while((charRead = InputRead.read(inputBuffer)) > 0) {
// char to string conversion
String readstring = String.copyValueOf(inputBuffer, 0, charRead);
s += readstring;
getContactInfo(s);
}
InputRead.close();
} catch(Exception e) {
e.printStackTrace();
}
}
-嘗試此代碼。 將sdCard路徑替換為存在mytextfile.txt的文件路徑。
String sdCard = Environment.getExternalStorageDirectory().getAbsolutePath();
String fileName = "mytextfile.txt";
String path = sdCard + "/" + MarketPath + "/";
File directory = new File(path);
if (directory.exists()) {
File file = new File(path + fileName);
if (file.exists()) {
String myData = ""; // this variable will store your file text
try {
FileInputStream fis = new FileInputStream(file);
DataInputStream in = new DataInputStream(fis);
BufferedReader br =new BufferedReader(new InputStreamReader(in));
String strLine;
while ((strLine = br.readLine()) != null) {
myData = myData + strLine;
}
in.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
您可以讀取ArrayList
所有行:
public void ReadBtn() {
int READ_BLOCK_SIZE = 100;
ArrayList<String> linesList = new ArrayList<>();
// reading text from file
try {
FileInputStream fileIn=openFileInput("mytextfile.txt");
InputStreamReader InputRead= new InputStreamReader(fileIn);
BufferedReader br = new BufferedReader(InputRead);
String line = br.readLine();
while (line != null) {
linesList.add(line);
line = br.readLine();
}
InputRead.close();
// here linesList contains an array of strings
for (String s: linesList) {
// do something for each line
}
} catch (Exception e) {
e.printStackTrace();
}
}
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