我正在尝试在我的示例Android应用程序中阅读一个简单的文本文件。我使用下面编写的代码来阅读简单的文本文件。
InputStream inputStream = openFileInput("test.txt");
InputStreamReader inputStreamReader = new InputStreamReader(inputStream);
BufferedReader bufferedReader = new BufferedReader(inputStreamReader);
我的问题是:
我应该将这个"test.txt"
文件放在我的项目中?我已经尝试将该文件放在"res/raw"
和"asset"
文件夹下,但是当上面编写的代码第一次执行时,我得到了exception "FileNotFound"
。
感谢您的帮助
答案 0 :(得分:180)
将您的文本文件放在Android项目下的/assets
目录中。使用AssetManager
类来访问它。
AssetManager am = context.getAssets();
InputStream is = am.open("test.txt");
或者您也可以将文件放在/res/raw
目录中,该文件将被编入索引,并且可以通过R文件中的ID访问:
InputStream is = context.getResources().openRawResource(R.raw.test);
答案 1 :(得分:25)
试试这个,
package example.txtRead;
import java.io.BufferedReader;
import java.io.ByteArrayOutputStream;
import java.io.FileReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.List;
import java.util.StringTokenizer;
import java.util.Vector;
import android.app.Activity;
import android.os.Bundle;
import android.widget.TextView;
public class txtRead extends Activity {
String labels="caption";
String text="";
String[] s;
private Vector<String> wordss;
int j=0;
private StringTokenizer tokenizer;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
wordss = new Vector<String>();
TextView helloTxt = (TextView)findViewById(R.id.hellotxt);
helloTxt.setText(readTxt());
}
private String readTxt(){
InputStream inputStream = getResources().openRawResource(R.raw.toc);
// InputStream inputStream = getResources().openRawResource(R.raw.internals);
System.out.println(inputStream);
ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
int i;
try {
i = inputStream.read();
while (i != -1)
{
byteArrayOutputStream.write(i);
i = inputStream.read();
}
inputStream.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return byteArrayOutputStream.toString();
}
}
答案 2 :(得分:23)
我就是这样做的:
public static String readFromAssets(Context context, String filename) throws IOException {
BufferedReader reader = new BufferedReader(new InputStreamReader(context.getAssets().open(filename)));
// do reading, usually loop until end of file reading
StringBuilder sb = new StringBuilder();
String mLine = reader.readLine();
while (mLine != null) {
sb.append(mLine); // process line
mLine = reader.readLine();
}
reader.close();
return sb.toString();
}
按如下方式使用:
readFromAssets(context,"test.txt")
答案 3 :(得分:7)
在assets
文件夹中包含文件需要您使用这段代码才能从assets
文件夹中获取文件:
yourContext.getAssets().open("test.txt");
在此示例中,getAssets()
会返回AssetManager
个实例,然后您可以自由地使用AssetManager
API中的任何方法。
答案 4 :(得分:5)
Mono For Android ....
try
{
System.IO.Stream StrIn = this.Assets.Open("MyMessage.txt");
string Content = string.Empty;
using (System.IO.StreamReader StrRead = new System.IO.StreamReader(StrIn))
{
try
{
Content = StrRead.ReadToEnd();
StrRead.Close();
}
catch (Exception ex) { csFunciones.MostarMsg(this, ex.Message); }
}
StrIn.Close();
StrIn = null;
}
catch (Exception ex) { csFunciones.MostarMsg(this, ex.Message); }
答案 5 :(得分:3)
读取保存在资产文件夹
中的文件public static String readFromFile(Context context, String file) {
try {
InputStream is = context.getAssets().open(file);
int size = is.available();
byte buffer[] = new byte[size];
is.read(buffer);
is.close();
return new String(buffer);
} catch (Exception e) {
e.printStackTrace();
return "" ;
}
}
答案 6 :(得分:0)
这是一个处理raw
和asset
文件的简单类:
公共类ReadFromFile {
public static String raw(Context context, @RawRes int id) {
InputStream is = context.getResources().openRawResource(id);
int size = 0;
try {
size = is.available();
} catch (IOException e) {
e.printStackTrace();
return "";
}
return readFile(size, is);
}
public static String asset(Context context, String fileName) {
InputStream is = null;
int size = 0;
try {
is = context.getAssets().open(fileName);
AssetFileDescriptor fd = null;
fd = context.getAssets().openFd(fileName);
size = (int) fd.getLength();
fd.close();
} catch (IOException e) {
e.printStackTrace();
return "";
}
return readFile(size, is);
}
private static String readFile(int size, InputStream is) {
try {
byte buffer[] = new byte[size];
is.read(buffer);
is.close();
return new String(buffer);
} catch (Exception e) {
e.printStackTrace();
return "";
}
}
}
例如:
ReadFromFile.raw(context, R.raw.textfile);
对于资产文件:
ReadFromFile.asset(context, "file.txt");