Android קריאת וכתיבת קבצים אנדרואיד смотреть онлайн

Android קריאת וכתיבת קבצים אנדרואיד




package il.co.newclass.files;

import android.content.Context;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;

public class MainActivity extends AppCompatActivity {

String fileName = "aaa.txt";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
final Context con = this;

((Button) findViewById(R.id.btnread)).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {

File file = new File(con.getFilesDir(), fileName);

try {
if (!file.exists()) {
Toast.makeText(con,"File is not exists",Toast.LENGTH_LONG).show();
}
else
{
FileInputStream is = new FileInputStream(file);

InputStreamReader isr = new InputStreamReader(is);

BufferedReader br = new BufferedReader(isr);

String str = br.readLine();
while(str!=null)
{

str = br.readLine();
}

br.close();
isr.close();
is.close();


}




}
catch (IOException e)
{
//
}

}
});

((Button) findViewById(R.id.btnwrite)).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {

File file = new File(con.getFilesDir(), fileName);

try {
if (!file.exists()) {
file.createNewFile();
}

FileOutputStream os = new FileOutputStream(file);
byte[] arr = new byte[100];
String str = "abcd!!!!";

OutputStreamWriter osw = new OutputStreamWriter(os);

osw.write(str);
osw.append("1111111");
osw.append("2222222");

osw.append("\n");
osw.append("1111111");
osw.append("2222222");
osw.append("\n");
osw.append("1111111");
osw.append("2222222");
osw.append("\n");
osw.append("1111111");
osw.append("2222222");
osw.append("\n");
osw.append("1111111");
osw.append("2222222");

osw.close();
os.close();


}
catch (IOException e)
{
//
}

}
});
}
}


חיים גלבוע, הדרכה, יעוץ ופתוח תוכנה
[email protected]
Haim Gilboa