Android - Why won't my Toast message show?
My toast doesn't show up and I am confused because I think I made it correctly, I don't understand.  As you can see its a program that shows three buttons, the first one activates a download which is supposed to open the PDFs file automatically - if there is no pdf reader a toast should pop up saying there isn't a reader.  the other buttons take to a new screen and operate as a back button.  

    public class myactivity extends Activity {

	public static final int DIALOG_DOWNLOAD_PROGRESS = 0;
	private Button startBtn;
	private ProgressDialog mProgressDialog;

	/** Called when the activity is first created. */
	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.myactivity);
		mProgressDialog = new ProgressDialog(myactivity.this);
		mProgressDialog.setMessage("Please be patient, file downloading...");
		mProgressDialog.setIndeterminate(false);
		mProgressDialog.setMax(100);
		mProgressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);

		Button Section = (Button) findViewById(R.id.Section);
		Section.setOnClickListener(new View.OnClickListener() {

			public void onClick(View view) {
				// TODO Auto-generated method stub
				Intent Section = new Intent(view.getContext(),
						Section.class);
				startActivity(Section);

			}
		});

		Button Back = (Button) findViewById(R.id.Back);
		Back.setOnClickListener(new View.OnClickListener() {

			public void onClick(View v) {
				// TODO Auto-generated method stub
				setResult(RESULT_OK);
				finish();
			}
		});

		startBtn = (Button) findViewById(R.id.Search);
		startBtn.setOnClickListener(new OnClickListener() {
			public void onClick(View v) {
				startDownload();
			}
		});
	}

	private void startDownload() {
		DownloadFile downloadFile = new DownloadFile();
		downloadFile
				.execute("http://www.website.com/document.pdf");

	}

	class DownloadFile extends AsyncTask<String, Integer, String> {

		@Override
		protected void onPreExecute() {
			super.onPreExecute();
			mProgressDialog.show();
		}

		@Override
		protected void onProgressUpdate(Integer... progress) {
			super.onProgressUpdate(progress);
			mProgressDialog.setProgress(progress[0]);
		}

		@Override
		protected String doInBackground(String... aurl) {
			try {

				URL url = new URL(aurl[0]);
				URLConnection connection = url.openConnection();

				connection.connect();
				int fileLength = connection.getContentLength();
				int tickSize = 2 * fileLength / 100;
				int nextProgress = tickSize;

				Log.d(

				"ANDRO_ASYNC", "Lenght of file: " + fileLength);

				InputStream input = new BufferedInputStream(url.openStream());

				String path = Environment.getExternalStorageDirectory()
						+ "/Android/Data/"
						+ getApplicationContext().getPackageName() + "/files";
				File file = new File(path);
				file.mkdirs();
				File outputFile = new File(file, "test1.pdf");

				OutputStream output = new FileOutputStream(outputFile);

				byte data[] = new byte[1024 * 1024];
				long total = 0;
				int count;
				while ((count = input.read(data)) != -1) {
					total += count;
					if (total >= nextProgress) {
						nextProgress = (int) ((total / tickSize + 1) * tickSize);
						this.publishProgress((int) (total * 100 / fileLength));
					}
					output.write(data, 0, count);
				}

				output.flush();
				output.close();
				input.close();
				showPdf();

			} catch (Exception e) {
			}
			return null;
		}

	}

	private void showPdf() {
		// TODO Auto-generated method stub
		mProgressDialog.dismiss();

		File file = new File(Environment.getExternalStorageDirectory()
				+ "/Android/Data/" + getApplicationContext().getPackageName()
				+ "/files/test1.pdf");
		Intent testIntent = new Intent(Intent.ACTION_VIEW);
		testIntent.setType("application/pdf");
		Intent intent = new Intent();
		intent.setAction(Intent.ACTION_VIEW);
		Uri uri = Uri.fromFile(file);
		intent.setDataAndType(uri, "application/pdf");
		try {
			startActivity(intent);
		} catch (ActivityNotFoundException e) {
			Toast.makeText(myactivity .this,
					"No Application Available to View PDF", Toast.LENGTH_LONG).show();
		}

	}

    }
Android - Why won't my Toast message show?
===

My toast doesn't show up and I am confused because I think I made it correctly, I don't understand.  As you can see its a program that shows three buttons, the first one activates a download which is supposed to open the PDFs file automatically - if there is no pdf reader a toast should pop up saying there isn't a reader.  the other buttons take to a new screen and operate as a back button.  

    public class myactivity extends Activity {

	public static final int DIALOG_DOWNLOAD_PROGRESS = 0;
	private Button startBtn;
	private ProgressDialog mProgressDialog;

	/** Called when the activity is first created. */
	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.myactivity);
		mProgressDialog = new ProgressDialog(myactivity.this);
		mProgressDialog.setMessage("Please be patient, file downloading...");
		mProgressDialog.setIndeterminate(false);
		mProgressDialog.setMax(100);
		mProgressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);

		Button Section = (Button) findViewById(R.id.Section);
		Section.setOnClickListener(new View.OnClickListener() {

			public void onClick(View view) {
				// TODO Auto-generated method stub
				Intent Section = new Intent(view.getContext(),
						Section.class);
				startActivity(Section);

			}
		});

		Button Back = (Button) findViewById(R.id.Back);
		Back.setOnClickListener(new View.OnClickListener() {

			public void onClick(View v) {
				// TODO Auto-generated method stub
				setResult(RESULT_OK);
				finish();
			}
		});

		startBtn = (Button) findViewById(R.id.Search);
		startBtn.setOnClickListener(new OnClickListener() {
			public void onClick(View v) {
				startDownload();
			}
		});
	}

	private void startDownload() {
		DownloadFile downloadFile = new DownloadFile();
		downloadFile
				.execute("http://www.website.com/document.pdf");

	}

	class DownloadFile extends AsyncTask<String, Integer, String> {

		@Override
		protected void onPreExecute() {
			super.onPreExecute();
			mProgressDialog.show();
		}

		@Override
		protected void onProgressUpdate(Integer... progress) {
			super.onProgressUpdate(progress);
			mProgressDialog.setProgress(progress[0]);
		}

		@Override
		protected String doInBackground(String... aurl) {
			try {

				URL url = new URL(aurl[0]);
				URLConnection connection = url.openConnection();

				connection.connect();
				int fileLength = connection.getContentLength();
				int tickSize = 2 * fileLength / 100;
				int nextProgress = tickSize;

				Log.d(

				"ANDRO_ASYNC", "Lenght of file: " + fileLength);

				InputStream input = new BufferedInputStream(url.openStream());

				String path = Environment.getExternalStorageDirectory()
						+ "/Android/Data/"
						+ getApplicationContext().getPackageName() + "/files";
				File file = new File(path);
				file.mkdirs();
				File outputFile = new File(file, "test1.pdf");

				OutputStream output = new FileOutputStream(outputFile);

				byte data[] = new byte[1024 * 1024];
				long total = 0;
				int count;
				while ((count = input.read(data)) != -1) {
					total += count;
					if (total >= nextProgress) {
						nextProgress = (int) ((total / tickSize + 1) * tickSize);
						this.publishProgress((int) (total * 100 / fileLength));
					}
					output.write(data, 0, count);
				}

				output.flush();
				output.close();
				input.close();
				showPdf();

			} catch (Exception e) {
			}
			return null;
		}

	}

	private void showPdf() {
		// TODO Auto-generated method stub
		mProgressDialog.dismiss();

		File file = new File(Environment.getExternalStorageDirectory()
				+ "/Android/Data/" + getApplicationContext().getPackageName()
				+ "/files/test1.pdf");
		Intent testIntent = new Intent(Intent.ACTION_VIEW);
		testIntent.setType("application/pdf");
		Intent intent = new Intent();
		intent.setAction(Intent.ACTION_VIEW);
		Uri uri = Uri.fromFile(file);
		intent.setDataAndType(uri, "application/pdf");
		try {
			startActivity(intent);
		} catch (ActivityNotFoundException e) {
			Toast.makeText(myactivity .this,
					"No Application Available to View PDF", Toast.LENGTH_LONG).show();
		}

	}

    }