3.android 读取文件中的数据

package com.wjl.bc;

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;

import org.apache.http.util.EncodingUtils;

import android.R.string;
import android.app.Activity;
import android.os.Bundle;
import android.widget.TextView;

public class FileManage2Activity extends Activity {
/** Called when the activity is first created. */

private TextView mytextView;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);

mytextView=(TextView)findViewById(R.id.myTextView);

//        this.fileFromRaw();
//        fileFromAsset();

//        fileFromSdcard();
String fileName="Test.txt";
String message="abcderty";
writeFileData(fileName, message);

}

//从 resource中的raw 文件夹中获取文件病毒去数据（资源文件只能度不能写）
public void fileFromRaw()
{
String res="";
try {
InputStream in=getResources().openRawResource(R.raw.abc);
int length=in.available();
byte[] buffer=new byte[length];
in.read(buffer);
res=EncodingUtils.getString(buffer, "UTF-8");
//			res=EncodingUtils.getString(buffer, "BIG5");
//			res=EncodingUtils.getString(buffer, "UNICODE");
in.close();
mytextView.setText(res);
} catch (Exception e) {
// TODO: handle exception
e.printStackTrace();
}
}

/**
* 从asset中获取文件并读出数据（资源文件只能读不能写）
*/
public void fileFromAsset()
{
String fileName="abc.txt";
String res="";
try {
InputStream in=getResources().getAssets().open(fileName);
int length=in.available();
byte[] buffer=new byte[length];
in.read(buffer);
res=EncodingUtils.getString(buffer, "UTF-8");
in.close();
mytextView.setText(res);
} catch (Exception e) {
// TODO: handle exception
e.printStackTrace();
}
}

/**
* 从sdcard 中去读文件，首先要把文件通过 adb.exe push d:\abc.txt\sdcard
*
*/

public void fileFromSdcard()
{
String fileName="/sdcard/abc.txt";
String res="";
try {
FileInputStream fin=new FileInputStream(fileName);
int length=fin.available();
byte[] buffer=new byte[length];
fin.read(buffer);
res=EncodingUtils.getString(buffer, "UTF-8");
fin.close();
mytextView.setText(res);
} catch (Exception e) {
// TODO: handle exception
e.printStackTrace();
}
}

public void writeFileData(String fileName, String message)
{
try {
FileOutputStream fout=openFileOutput(fileName, MODE_PRIVATE);
byte[] bytes=message.getBytes();
fout.write(bytes);
fout.close();
} catch (Exception e) {
// TODO: handle exception
e.printStackTrace();
}
}
}