External Storage Activity : Activity « UI « Android

1. Android
2. UI
3. Activity

External Storage Activity

     
package app.test;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;

import android.app.Activity;
import android.os.Bundle;
import android.os.Environment;
import android.widget.TextView;

public class Test extends Activity {
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    TextView textView = new TextView(this);
    setContentView(textView);
    String state = Environment.getExternalStorageState();
    if (!state.equals(Environment.MEDIA_MOUNTED)) {
      textView.setText("No external storage mounted");
    } else {
      File externalDir = Environment.getExternalStorageDirectory();
      File textFile = new File(externalDir.getAbsolutePath()
          + File.separator + "text.txt");
      try {
        writeTextFile(textFile, "This is a test.");
        String text = readTextFile(textFile);
        textView.setText(text);
        if (!textFile.delete()) {
          textView.setText("Couldn't remove temporary file");
        }
      } catch (IOException e) {
        textView.setText("something went wrong! " + e.getMessage());
      }
    }
  }

  private void writeTextFile(File file, String text) throws IOException {
    BufferedWriter writer = new BufferedWriter(new FileWriter(file));
    writer.write(text);
    writer.close();
  }

  private String readTextFile(File file) throws IOException {
    BufferedReader reader = new BufferedReader(new FileReader(file));
    StringBuilder text = new StringBuilder();
    String line;
    while ((line = reader.readLine()) != null) {
      text.append(line);
      text.append("\n");
    }
    reader.close();
    return text.toString();
  }
}

   
    
    
    
    
  

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