#ANDROID - ExternalStorage Kullanımı

<?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:id="@+id/tvCanWrite"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="TextView" />

    <TextView
        android:id="@+id/tvCanRead"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="TextView" />

    <Spinner
        android:id="@+id/spinner1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />

    <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Farklı Kaydet.." />

    <EditText
        android:id="@+id/etFarkliKaydet"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:ems="10" >

        <requestFocus />
    </EditText>

    <Button
        android:id="@+id/bKaydetmeyiOnayla"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Onayla" />

    <Button
        android:id="@+id/bDosyaKaydet"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Kaydet"
        android:visibility="invisible"
        />

</LinearLayout>

package com.hakancengiz.blogders;

import android.app.Activity;
import android.media.MediaScannerConnection;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Spinner;
import android.widget.TextView;
import android.widget.Toast;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

public class ExternalData extends Activity implements AdapterView.OnItemSelectedListener, View.OnClickListener {

    private TextView canWrite, canRead;
    private String state;
    boolean canW, canR;
    Spinner spinner;

    // Dosyamızı kaydedeceğimiz dizinler
    String[] paths = {"Muzik", "Resimler", "Indirilenler"};

    // Kaydedilecek dosya pathlerini burda tutucaz
    File path = null;

    // kaydedilecek dosya için
    File filename = null;
    EditText dosyayiKaydet;
    Button onayla, kaydet;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.externaldata);

        canWrite = (TextView) findViewById(R.id.tvCanWrite);
        canRead = (TextView) findViewById(R.id.tvCanRead);
        spinner = (Spinner) findViewById(R.id.spinner1);
        onayla = (Button) findViewById(R.id.bKaydetmeyiOnayla);
        kaydet = (Button) findViewById(R.id.bDosyaKaydet);
        dosyayiKaydet = (EditText) findViewById(R.id.etFarkliKaydet);
        onayla.setOnClickListener(this);
        kaydet.setOnClickListener(this);

        // gidilen dizinin dosya okuma-yazma için izin durumu
        checkState();

        // spinner'da gösterilecek değerler için adapter tanımladık
        ArrayAdapter<String> adapter;
        adapter = new ArrayAdapter<String>(ExternalData.this,
                android.R.layout.simple_spinner_item, paths);

        spinner.setAdapter(adapter);
        spinner.setOnItemSelectedListener(this);
    }

    private void checkState() {
        // TODO Auto-generated method stub
        state = Environment.getExternalStorageState();
        if (state.equals(Environment.MEDIA_MOUNTED)) {

            canWrite.setText("true");
            canRead.setText("true");
            canW = canR = true;

        } else if (state.equals(Environment.MEDIA_MOUNTED_READ_ONLY)) {

            canWrite.setText("false");
            canRead.setText("true");
            canW = false;
            canR = true;

        } else {

            canWrite.setText("false");
            canRead.setText("false");
            canW = canR = false;

        }
    }

    @Override
    public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {

        int secilemItem = spinner.getSelectedItemPosition();
        switch (secilemItem) {

            // secilen spinner öğesi için dosyayı kaydedeceğimiz pathleri
            // path değişkenine atadık
            case 0:
                path = Environment
                        .getExternalStoragePublicDirectory(Environment.DIRECTORY_MUSIC);
                break;

            case 1:
                path = Environment
                        .getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES);
                break;
            case 2:
                path = Environment
                        .getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS);
                break;

        }

    }

    @Override
    public void onNothingSelected(AdapterView<?> parent) {

    }

    @Override
    public void onClick(View v) {

        switch (v.getId()) {
            case R.id.bKaydetmeyiOnayla:
                kaydet.setVisibility(Button.VISIBLE);
                onayla.setVisibility(Button.GONE);
                break;

            case R.id.bDosyaKaydet:
                // edittext'e girilen dosya adı
                String f = dosyayiKaydet.getText().toString();

                // path ve uzantısıyla beraber dosya adımız
                filename = new File(path, f + ".png");
                if (canW == canR == true) {

                    // dosyanın yazılacağı yeri oluşturduk
                    path.mkdirs();

                    try {

                        // dosyamızı resource içinde is'e atadık
                        InputStream is = getResources().openRawResource(R.drawable.bg_app);
                        OutputStream os = new FileOutputStream(filename);
                        byte[] data = new byte[is.available()];

                        is.read(data);
                        os.write(data);

                        is.close();
                        os.close();

                        Toast t = Toast.makeText(ExternalData.this, "Dosya kaydedildi.", Toast.LENGTH_LONG);
                        t.show();

                        // update files for the user to use
                        MediaScannerConnection
                                .scanFile(
                                        ExternalData.this,
                                        new String[]{filename.toString()},
                                        null,
                                        new MediaScannerConnection.OnScanCompletedListener() {

                                            @Override
                                            public void onScanCompleted(
                                                    String path, Uri uri) {
                                                // TODO Auto-generated method stub
                                                Toast t = Toast.makeText(
                                                        ExternalData.this,
                                                        "tarama tamamlandı",
                                                        Toast.LENGTH_SHORT);
                                                t.show();
                                            }
                                        });

                    } catch (FileNotFoundException e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                    } catch (IOException e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                    }

                }

                break;
        }

    }
}