Android Application Activity - MainActivity.java
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| package com.as400samplecode;import java.io.BufferedInputStream;import java.io.File;import java.io.FileOutputStream;import java.io.InputStream;import java.io.OutputStream;import java.net.URL;import java.net.URLConnection;import android.os.AsyncTask;import android.os.Bundle;import android.app.Activity;import android.content.Context;import android.content.ContextWrapper;import android.graphics.BitmapFactory;import android.view.Gravity;import android.view.Menu;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.ImageView;import android.widget.ProgressBar;import android.widget.TextView;import android.widget.Toast;public class MainActivity extends Activity implements OnClickListener{ private ProgressBar progressBar1; private ProgressBar progressBar2; private String filepath = "MyFileStorage"; private File directory; private TextView finished; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); ContextWrapper contextWrapper = new ContextWrapper(getApplicationContext()); directory = contextWrapper.getDir(filepath, Context.MODE_PRIVATE); progressBar1 = (ProgressBar) findViewById(R.id.progressBar1); progressBar1.setVisibility(View.GONE); progressBar2 = (ProgressBar) findViewById(R.id.progressBar2); progressBar2.setVisibility(View.GONE); finished = (TextView) findViewById(R.id.textView1); finished.setVisibility(View.GONE); Button start = (Button) findViewById(R.id.start); start.setOnClickListener(this); Button stop = (Button) findViewById(R.id.stop); stop.setOnClickListener(this); Button download = (Button) findViewById(R.id.download); download.setOnClickListener(this); } public void onClick(View v) { switch (v.getId()) { case R.id.start: progressBar1.setVisibility(View.VISIBLE); break; case R.id.stop: progressBar1.setVisibility(View.GONE); break; case R.id.download: grabURL(url); break; // More buttons go here (if any) ... } } public void grabURL(String url) { new GrabURL().execute(url); } private class GrabURL extends AsyncTask<String, Integer, String> { protected void onPreExecute() { progressBar2.setVisibility(View.VISIBLE); progressBar2.setProgress(0); finished.setVisibility(View.GONE); } protected String doInBackground(String... urls) { String filename = "MySampleFile.png"; File myFile = new File(directory , filename); try { URL url = new URL(urls[0]); URLConnection connection = url.openConnection(); connection.connect(); int fileSize = connection.getContentLength(); InputStream is = new BufferedInputStream(url.openStream()); OutputStream os = new FileOutputStream(myFile); byte data[] = new byte[1024]; long total = 0; int count; while ((count = is.read(data)) != -1) { total += count; publishProgress((int) (total * 100 / fileSize)); os.write(data, 0, count); } os.flush(); os.close(); is.close(); } catch (Exception e) { e.printStackTrace(); } return filename; } protected void onProgressUpdate(Integer... progress) { finished.setVisibility(View.VISIBLE); finished.setText(String.valueOf(progress[0]) + "%"); progressBar2.setProgress(progress[0]); } protected void onCancelled() { Toast toast = Toast.makeText(getBaseContext(), "Error connecting to Server", Toast.LENGTH_LONG); toast.setGravity(Gravity.TOP, 25, 400); toast.show(); } protected void onPostExecute(String filename) { progressBar2.setProgress(100); finished.setVisibility(View.VISIBLE); finished.setText("Finished downloading..."); File myFile = new File(directory , filename); ImageView myImage = (ImageView) findViewById(R.id.imageView1); myImage.setImageBitmap(BitmapFactory.decodeFile(myFile.getAbsolutePath())); } } @Override public boolean onCreateOptionsMenu(Menu menu) { getMenuInflater().inflate(R.menu.activity_main, menu); return true; }} |
