Android Open Source - latest-gists-android Detail Activity

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License

The source code is released under:

MIT License

Java Source Code

package com.coolmodev.latestgists;
/*  ww  w .j a v  a 2  s.c  o m*/
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;

import android.app.Activity;
import android.app.AlertDialog;
import android.os.AsyncTask;
import android.os.Bundle;
import android.text.method.ScrollingMovementMethod;
import android.view.View;
import android.widget.ProgressBar;
import android.widget.TextView;

public class DetailActivity extends Activity {

  private TextView mDetailText;
  private ProgressBar mProgressBar;
  private GetFileTextTask mGetFileTask;
  
  @Override
  public void onCreate(Bundle bundle) {
    super.onCreate(bundle);
    
    setContentView(R.layout.activity_detail);
    mDetailText = (TextView)findViewById(R.id.detail_text);
    mDetailText.setMovementMethod(new ScrollingMovementMethod());
  
    mProgressBar = (ProgressBar)findViewById(R.id.progress_bar);
    
    mGetFileTask = new GetFileTextTask();
    mGetFileTask.execute((Void)null);
  }
  
  @Override
  public void onDestroy() {
    super.onDestroy();
    if (mGetFileTask != null) {
      mGetFileTask.cancel(true);
    }
  }
  
  private class GetFileTextTask extends AsyncTask<Void, Void, String> {

    @Override
    protected void onPreExecute() {
      if (mProgressBar != null) {
        mProgressBar.setVisibility(View.VISIBLE);
      }
    }
    
    @Override
    protected String doInBackground(Void... params) {
      URL url = null;
      String fileText = null;
      try {
        String urlString = getIntent().getStringExtra(Constants.GIST_FILE_URL_KEY);
        if (urlString != null) {
          url = new URL(urlString);
          HttpURLConnection con = (HttpURLConnection) url.openConnection();

          InputStream stream = con.getInputStream();

          BufferedReader reader = null;
          StringBuilder fileBuilder = new StringBuilder();
          try {
            reader = new BufferedReader(new InputStreamReader(stream));
            String line = reader.readLine();
            while (line != null) {
              fileBuilder.append(line);
              line = reader.readLine();
            }
          } catch (IOException e) {
            
          } finally {
            if (reader != null) {
              try {
                reader.close();
              } catch (IOException e) {
                // no op, not much we can do here
              }
            }
          }
          fileText = fileBuilder.toString();
        }
      } catch (MalformedURLException e) {
        return null;
      } catch (IOException e) {
        return null;
      }
      return fileText;
    }
    
    protected void onPostExecute(String result) {
      if (mDetailText != null && result != null) {
        mDetailText.setText(result);
        if (mProgressBar != null) {
          mProgressBar.setVisibility(View.GONE);
        }
      } else if (result == null) {
        AlertDialog.Builder builder = new AlertDialog.Builder(DetailActivity.this);
        builder.setTitle("Error")
        .setMessage("Could not retrieve file.")
        .create()
        .show();
        
      }
    }
  }
}

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