안드로이드 기초 강좌(fileIO, DBAdapter, notification) - 5/27

안녕하세요. 

fileIO. 파일 입출력에 관한 예제입니다.

activity_main.xml

<LinearLayout 

    xmlns:android="http://schemas.android.com/apk/res/android"

    android:layout_width="fill_parent"

    android:layout_height="fill_parent"

    android:orientation="vertical">

    

    <Button

        android:id="@+id/save"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:text="save"/> 

    

    <Button

        android:id="@+id/load"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:text="load"/>

    

    <Button 

        android:id="@+id/loadres"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:text="loadres"/>

    

    <Button 

        android:id="@+id/delete"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:text="delete"/>

    

    

    <EditText 

        android:id="@+id/edittext"

        android:layout_width="fill_parent"

        android:layout_height="wrap_content"

        android:text="edittext"/>

</LinearLayout>

MainActivity.java

package com.example.fileio;

import java.io.FileInputStream;

import java.io.FileNotFoundException;

import java.io.FileOutputStream;

import java.io.IOException;

import java.io.InputStream;

import java.io.InputStreamReader;

import android.os.Bundle;

import android.app.Activity;

import android.content.Context;

import android.util.Log;

import android.view.Menu;

import android.view.View;

import android.widget.Button;

import android.widget.EditText;

public class MainActivity extends Activity {

EditText edit;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

edit = (EditText)findViewById(R.id.edittext);

findViewById(R.id.save).setOnClickListener(clickListener);

findViewById(R.id.load).setOnClickListener(clickListener);

findViewById(R.id.loadres).setOnClickListener(clickListener);

findViewById(R.id.delete).setOnClickListener(clickListener);

}

Button.OnClickListener clickListener = new View.OnClickListener() {

@Override

public void onClick(View v) {

// TODO Auto-generated method stub

switch (v.getId()){

case R.id.save:

try{

FileOutputStream fos = 

openFileOutput("test.txt", Context.MODE_WORLD_READABLE);

String str = "android file io test";

fos.write(str.getBytes());

fos.close();

edit.setText("file sucess");

}catch(Exception e){

Log.i("save", "file fail");

}

break;

case R.id.load:

try{

FileInputStream fis = openFileInput("test.txt");

byte[] data = new byte[fis.available()];

while(fis.read(data) != -1){} fis.close();

edit.setText(new String(data));

}catch (FileNotFoundException fileNotFountError){

edit.setText("File not found");

}catch (IOException ioe){

ioe.printStackTrace();

}

break;

case R.id.loadres:

try{

InputStream fres = getResources().openRawResource(R.raw.myfile);

InputStreamReader reader = new InputStreamReader(fres, "UTf-8");

char[] data = new char[fres.available()];

while(reader.read(data) != -1) {} fres.close();

edit.setText(new String(data));

} catch(Exception e){

}

break;

case R.id.delete:

if(deleteFile("text.txt")){

edit.setText("delete success");

}

else{

edit.setText("delete fail");

}

break;

default:

break;

}

}

};

}

위에 raw라는 폴더에 myfile.txt 를 만들어서 넣어줍니다.

실행결과는 아래와 같이 됩니다.

sqlite database browser

DBAdapter

간단히 DB를 적용해서 출력할 수 있는 예제입니다.

notification 기능에 대한 구현입니다. 안드로이드에서는 간단한 알리미를 보낼 수 있습니다.

activity_main.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    xmlns:tools="http://schemas.android.com/tools"

    android:layout_width="fill_parent"

    android:layout_height="fill_parent"

    android:orientation="vertical" >

<Button

    android:id="@+id/btn0"

    android:layout_width="wrap_content"

    android:layout_height="wrap_content"

    android:text="notifi"/>

<Button

    android:id="@+id/btn1"

    android:layout_width="wrap_content"

    android:layout_height="wrap_content"

    android:text="cancel"/>

</LinearLayout>

MainActivity.java

package com.example.notification;

import android.os.Bundle;

import android.app.Activity;

import android.app.Notification;

import android.app.NotificationManager;

import android.app.PendingIntent;

import android.content.Intent;

import android.view.Menu;

import android.view.View;

import android.widget.Button;

import android.widget.Toast;

public class MainActivity extends Activity {

private NotificationManager mNotificationManager; 

private Button mNotifiButton;

private Button mCancelButton;

private final static int MESSAGE_KEY = 12345;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

mNotificationManager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);

mNotifiButton = (Button) findViewById(R.id.btn0); mNotifiButton.setOnClickListener(clickHandler);

mCancelButton = (Button) findViewById(R.id.btn1); mCancelButton.setOnClickListener(clickHandler);

}

private void notifi() {

String ticker = "there is notification content message but content is long wheel up";

String title = "there is notification title message";

String text = "there is notification content message";

Intent intent = new Intent(this, MainActivity.class);

PendingIntent pendingIntent = PendingIntent.getActivity(MainActivity.this , 0, intent, 0);

Notification notification = new Notification(android.R.drawable.ic_input_add, ticker, System.currentTimeMillis());

notification.setLatestEventInfo(this, title, text, pendingIntent);

mNotificationManager.notify(MESSAGE_KEY, notification);

Toast.makeText(this, "Notification notify.", Toast.LENGTH_SHORT).show(); 

}

private void notifiCancel() {

mNotificationManager.cancel(MESSAGE_KEY);

Toast.makeText(this, "Notification cancel.", Toast.LENGTH_SHORT).show();

}

Button.OnClickListener clickHandler = new View.OnClickListener() {

public void onClick(View v) {

// TODO Auto-generated method stub 

switch (v.getId()) {

case R.id.btn0: notifi();

break;

case R.id.btn1: notifiCancel();

break;

}

}

};

}

실행결과는 다음과 같습니다.

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