Save Open Create

Activity_main.xml


<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 xmlns:tools="http://schemas.android.com/tools"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 android:orientation="vertical"
 android:gravity="center">

 <LinearLayout
 android:layout_width="match_parent"
 android:layout_height="wrap_content"
 android:orientation="horizontal"
 android:gravity="center">

 <Button
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:text="Create new file"
 android:id="@+id/btn_create"
 android:layout_gravity="left"/>

 <Button
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:text="Open"
 android:id="@+id/btn_open"
 android:layout_gravity="right"/>

 </LinearLayout>
 <TextView
 android:layout_width="fill_parent"
 android:layout_height="wrap_content"
 android:gravity="center"
 android:text="File:"
 android:id="@+id/lbl_file" />

 <EditText
 android:layout_width="match_parent"
 android:layout_height="200dp"
 android:id="@+id/txt_content"/>

 <Button android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:text="Save"
 android:layout_gravity="center"
 android:id="@+id/btn_save"/>
 </LinearLayout>



Dialog_layout.xml



<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 android:orientation="vertical" >

 <TextView
 android:layout_width="match_parent"
 android:layout_height="wrap_content"
 android:text="Enter File Name"/>

 <EditText
 android:layout_width="match_parent"
 android:layout_height="wrap_content"
 android:id="@+id/txt_filename"/>

</LinearLayout>


Manifest.xml



<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
 package="com.example.p2"
 android:versionCode="1"
 android:versionName="1.0" >
 <uses-sdk
 android:minSdkVersion="8"
 android:targetSdkVersion="18" />
 <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
 <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
 <application
 android:allowBackup="true"
 android:icon="@drawable/ic_launcher"
 android:label="@string/app_name"
 android:theme="@style/AppTheme" >
 <activity
 android:name="com.example.p2.MainActivity"
 android:label="@string/app_name" >
 <intent-filter>
 <action android:name="android.intent.action.MAIN" />
 <category android:name="android.intent.category.LAUNCHER" />
 </intent-filter>
 </activity>
 </application>
</manifest>



MainActivity.java



package com.example.p2;
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;
import android.os.Bundle;
import android.os.Environment;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;
public class MainActivity extends Activity implements OnClickListener {
TextView lblFile;
EditText txtContent;
Button btnCreate,btnSave,btnOpen;
int FILE_CHOOSE_REQUEST=1;
String filepath;
String filename;
 @Override
 protected void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_main);
 lblFile=(TextView)findViewById(R.id.lbl_file);

 txtContent=(EditText)findViewById(R.id.txt_content);

 btnCreate=(Button)findViewById(R.id.btn_create);
 btnCreate.setOnClickListener(this);

 btnSave=(Button)findViewById(R.id.btn_save);
 btnSave.setOnClickListener(this);

 btnOpen=(Button)findViewById(R.id.btn_open);
 btnOpen.setOnClickListener(this);
 }


@Override
 public boolean onCreateOptionsMenu(Menu menu) {
 // Inflate the menu; this adds items to the action bar if it is present.
 getMenuInflater().inflate(R.menu.main, menu);
 return true;
 }

 public void onActivityResult(int requestCode,int resultCode, Intent data)
 {
 super.onActivityResult(requestCode, resultCode, data);
 if(resultCode==RESULT_OK)
 {
 filepath=data.getData().getPath();
 filename=filepath.substring(filepath.lastIndexOf("/")+1);
 filepath=filepath.substring(0,filepath.lastIndexOf("/"));
 readFromFile(filepath,filename);
 lblFile.setText(filepath+"/"+filename);
 }
 else
 {
 Toast.makeText(this,"Wrong Choice of File",
Toast.LENGTH_LONG).show();
 }
 }
 public void writeToFile(String path,String filename)
 {
 try {
FileOutputStream fileout=new FileOutputStream(new
File(path+"/"+filename));
OutputStreamWriter outputWriter=new OutputStreamWriter(fileout);
outputWriter.write(txtContent.getText().toString());
outputWriter.close();
//display file saved message
Toast.makeText(getBaseContext(), "File Saved successfully!",
Toast.LENGTH_SHORT).show();
} catch (Exception e) {
Toast.makeText(getBaseContext(), e.getLocalizedMessage(),
Toast.LENGTH_SHORT).show();
}
 }


 public void readFromFile(String path,String filename)
 {
 try {
FileInputStream fileIn=new FileInputStream(path+"/"+filename);
InputStreamReader inputReader= new InputStreamReader(fileIn);
BufferedReader br=new BufferedReader(inputReader);
String data=br.readLine();
while(data!=null)
{
txtContent.append(data);
data=br.readLine();
}
br.close();
} catch (Exception e) {
Toast.makeText(getBaseContext(),e.getLocalizedMessage(),
Toast.LENGTH_SHORT).show();
}
 }

 public void onShowCreateDialog()
 {
 AlertDialog.Builder builder=new AlertDialog.Builder(this);
 final View dialogView=getLayoutInflater().inflate(R.layout.dialog_layout, null);
 builder.setView(dialogView);
 builder.setPositiveButton("Ok", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface arg0, int arg1) {
// TODO Auto-generated method stub
EditText
txtFilename=(EditText)dialogView.findViewById(R.id.txt_filename);
filepath=Environment.getExternalStorageDirectory().getAbsolutePath();
filename=txtFilename.getText().toString();
File f=new File(filepath+"/"+filename);
try {
f.createNewFile();
} catch (IOException e) {
// TODO Auto-generated catch block
Toast.makeText(getBaseContext(),
""+e.getLocalizedMessage(), Toast.LENGTH_LONG).show();
}
lblFile.setText(filepath+"/"+filename);
}
});
 builder.setNegativeButton("Cancel", null);
 AlertDialog dialog=builder.create();
 dialog.show();
 }
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
if(v.equals(btnOpen))
{
Intent it=new Intent(Intent.ACTION_GET_CONTENT);
//it.setType("*.*");
it.setType("file/*");
startActivityForResult(it, 0);
}
else if(v.equals(btnCreate))
{
onShowCreateDialog();
}
else if(v.equals(btnSave))
{
writeToFile(filepath, filename);
}
}

}