External Storage Directory : External Storage « Hardware « Android

1. Android
2. Hardware
3. External Storage

External Storage Directory

   
package app.test;

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

import android.app.Activity;
import android.os.Bundle;
import android.os.Environment;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

public class Test extends Activity {
  private EditText textBox;
  private static final int READ_BLOCK_SIZE = 100;

  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    InputStream is = this.getResources().openRawResource(R.raw.textfile);
    BufferedReader br = new BufferedReader(new InputStreamReader(is));
    String str = null;
    try {
      while ((str = br.readLine()) != null) {
        Toast.makeText(getBaseContext(), str, Toast.LENGTH_SHORT)
            .show();
      }
      is.close();
      br.close();
    } catch (IOException e) {
      e.printStackTrace();
    }

    textBox = (EditText) findViewById(R.id.txtText1);
    Button saveBtn = (Button) findViewById(R.id.btnSave);
    Button loadBtn = (Button) findViewById(R.id.btnLoad);

    saveBtn.setOnClickListener(new View.OnClickListener() {
      public void onClick(View v) {

        String str = textBox.getText().toString();
        try {
          /*
           * //---Internal Storage--- FileOutputStream fOut =
           * openFileOutput("textfile.txt", MODE_WORLD_READABLE);
           *
           */
          File sdCard = Environment.getExternalStorageDirectory();
          File directory = new File(sdCard.getAbsolutePath()
              + "/MyFiles");
          directory.mkdirs();
          File file = new File(directory, "textfile.txt");
          FileOutputStream fOut = new FileOutputStream(file);
          OutputStreamWriter osw = new OutputStreamWriter(fOut);
          osw.write(str);
          osw.flush();
          osw.close();
          Toast.makeText(getBaseContext(),"File saved successfully!", Toast.LENGTH_SHORT).show();
          textBox.setText("");
        } catch (IOException ioe) {
          ioe.printStackTrace();
        }
      }
    });

    loadBtn.setOnClickListener(new View.OnClickListener() {
      public void onClick(View v) {
        try {

          // ---SD Storage---
          File sdCard = Environment.getExternalStorageDirectory();
          File directory = new File(sdCard.getAbsolutePath()
              + "/MyFiles");
          File file = new File(directory, "textfile.txt");
          FileInputStream fIn = new FileInputStream(file);
          InputStreamReader isr = new InputStreamReader(fIn);
          char[] inputBuffer = new char[READ_BLOCK_SIZE];
          String s = "";
          int charRead;
          while ((charRead = isr.read(inputBuffer)) > 0) {

            String readString = String.copyValueOf(inputBuffer, 0,
                charRead);
            s += readString;

            inputBuffer = new char[READ_BLOCK_SIZE];
          }
          textBox.setText(s);

          Toast.makeText(getBaseContext(),
              "File loaded successfully!", Toast.LENGTH_SHORT)
              .show();
        } catch (IOException ioe) {
          ioe.printStackTrace();
        }
      }
    });
  }
}

//raw/textfile.txt

The quick brown fox jumps over the lazy dog

// main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
    
<TextView  
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="Please enter some text"
    />
<EditText
    android:id="@+id/txtText1" 
    android:layout_width="fill_parent"
    android:layout_height="wrap_content" />
    
<Button 
    android:id="@+id/btnSave"
    android:text="Save"  
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" />

<Button 
    android:id="@+id/btnLoad"
    android:text="Load"  
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" />

</LinearLayout>

   
    
    
  

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