Android Open Source - introToDroid4ed View Log Activity

• Back to Development/code  ↑

From Project

Back to project page introToDroid4ed.

License

The source code is released under:

GNU General Public License

Java Source Code

package com.introtoandroid.filesoc;
//from  ww  w . j a  va 2  s.co  m
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;


import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

public class ViewLogActivity extends Activity {
  public static final String LOG_FILENAME = "Chat_Log.txt";

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

    final TextView log = (TextView) findViewById(R.id.TextViewCurrentLogFile);
    
    // Read the file, dump it into the TextView
        try {
          InputStream iFile = (InputStream) openFileInput(LOG_FILENAME);
          log.setText(inputStreamToString(iFile));
    } catch (Exception e) {
      log.setText("Couldn't read log file.");
    }  
    
    // Handle Send Button
    final Button clearLog = (Button) findViewById(R.id.ButtonClearLog);
    clearLog.setOnClickListener(new View.OnClickListener() {
      public void onClick(View v) {
        // If the file exists, Delete the file
        if (java.util.Arrays.binarySearch(fileList(), LOG_FILENAME) != (-1)) {
          deleteFile(LOG_FILENAME);
        }
        
        // Update the screen
        final TextView log = (TextView) findViewById(R.id.TextViewCurrentLogFile);
            log.setText(null);
      }
    });

    // Handle Go to Chat button
    final Button goChat = (Button) findViewById(R.id.ButtonChat);
    goChat.setOnClickListener(new View.OnClickListener() {
      public void onClick(View v) {
        // Go to other activity that allows chat
            Intent intent = new Intent(ViewLogActivity.this, FileStreamOfConsciousnessActivity.class);
           startActivity(intent);
      }
    });
  }

  // Converts an input stream to a string so we can stick it in the TextView
  // Typically, this sort of possibly lengthy operation would be wrapped in a thread, 
  // and perhaps the UI would show a progress indicator as the file loaded into memory
  // but for this example, we keep it super simple for readability, since our chat log is tiny
  // To see an example of using another thread to offload this sort of operation, 
  // see the FileStreamOfConsciousness.java file, specifically the logChatMessage() method
  public String inputStreamToString(InputStream is) throws IOException {
    StringBuffer sBuffer = new StringBuffer();
    BufferedReader dataIO = new BufferedReader(new InputStreamReader(is));
    String strLine = null;

    while ((strLine = dataIO.readLine()) != null) {
      sBuffer.append(strLine + "\n");
    }

    dataIO.close();
    is.close();

    return sBuffer.toString();
  }
}

Java Source Code List

• Back to Development/code  ↑