android:file

<?xml version="1.0" encoding="utf-8"?><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" >    <TextView        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:text="@string/name" />    <EditText        android:id="@+id/fname"        android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:inputType="text" />    <TextView        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:text="@string/content" />    <EditText        android:id="@+id/fcontent"        android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:inputType="text"        android:minLines="6" />    <Button        android:id="@+id/store"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="@string/store" /></LinearLayout>

package com.example.service;import java.io.FileOutputStream;import android.content.Context;public class FileService {private Context context;    public FileService(Context context) {this.context = context;}public void save(String filename,String content)throws Exception{    FileOutputStream outputStream=context.openFileOutput(filename, Context.MODE_PRIVATE);    outputStream.write(content.getBytes());    outputStream.close();    }}

package com.example.file;import com.example.service.FileService;import android.app.Activity;import android.os.Bundle;import android.util.Log;import android.view.View;import android.widget.Button;import android.widget.EditText;import android.widget.Toast;public class FileActivity extends Activity {private static final String TAG="FileActivity";private FileService fileService;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_file);fileService=new FileService(this);Button button=(Button)this.findViewById(R.id.store);button.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {            EditText filenameText=(EditText)findViewById(R.id.fname);            EditText contentText=(EditText)findViewById(R.id.fcontent);            String filename=filenameText.getText().toString();            String content=contentText.getText().toString();            try {fileService.save(filename, content);Toast.makeText(FileActivity.this, R.string.success,Toast.LENGTH_LONG).show();} catch (Exception e) {Log.e(TAG,e.toString());Toast.makeText(FileActivity.this, R.string.fail,Toast.LENGTH_SHORT).show();}}});}}

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