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package com.javatechig.listapps;
 
import java.util.ArrayList;
import java.util.List;
import android.app.AlertDialog;
import android.app.ListActivity;
import android.app.ProgressDialog;
import android.content.ActivityNotFoundException;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.pm.ApplicationInfo;
import android.content.pm.PackageManager;
import android.net.Uri;
import android.os.AsyncTask;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.widget.ListView;
import android.widget.Toast;
 
public class AllAppsActivity extends ListActivity {
	private PackageManager packageManager = null;
	private List<ApplicationInfo> applist = null;
	private ApplicationAdapter listadaptor = null;
 
	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
 
		packageManager = getPackageManager();
 
		new LoadApplications().execute();
	}
 
	public boolean onCreateOptionsMenu(Menu menu) {
		MenuInflater inflater = getMenuInflater();
		inflater.inflate(R.menu.menu, menu);
 
		return true;
	}
 
	public boolean onOptionsItemSelected(MenuItem item) {
		boolean result = true;
 
		switch (item.getItemId()) {
		case R.id.menu_about: {
			displayAboutDialog();
 
			break;
		}
		default: {
			result = super.onOptionsItemSelected(item);
 
			break;
		}
		}
 
		return result;
	}
 
	private void displayAboutDialog() {
		final AlertDialog.Builder builder = new AlertDialog.Builder(this);
		builder.setTitle(getString(R.string.about_title));
		builder.setMessage(getString(R.string.about_desc));
 
		builder.setPositiveButton("Know More", new DialogInterface.OnClickListener() {
		       public void onClick(DialogInterface dialog, int id) {
		    	   Intent browserIntent = new Intent(Intent.ACTION_VIEW, Uri.parse("http://j...content-available-to-author-only...g.com"));
		    	   startActivity(browserIntent);
		    	   dialog.cancel();
		       }
		   });
		builder.setNegativeButton("No Thanks!", new DialogInterface.OnClickListener() {
		       public void onClick(DialogInterface dialog, int id) {
		            dialog.cancel();
		       }
		});
 
		builder.show();
	}
 
	@Override
	protected void onListItemClick(ListView l, View v, int position, long id) {
		super.onListItemClick(l, v, position, id);
 
		ApplicationInfo app = applist.get(position);
		try {
			Intent intent = packageManager
					.getLaunchIntentForPackage(app.packageName);
 
			if (null != intent) {
				startActivity(intent);
			}
		} catch (ActivityNotFoundException e) {
			Toast.makeText(AllAppsActivity.this, e.getMessage(),
					Toast.LENGTH_LONG).show();
		} catch (Exception e) {
			Toast.makeText(AllAppsActivity.this, e.getMessage(),
					Toast.LENGTH_LONG).show();
		}
	}
 
	private List<ApplicationInfo> checkForLaunchIntent(List<ApplicationInfo> list) {
		ArrayList<ApplicationInfo> applist = new ArrayList<ApplicationInfo>();
		for (ApplicationInfo info : list) {
			try {
				if (null != packageManager.getLaunchIntentForPackage(info.packageName)) {
					applist.add(info);
				}
			} catch (Exception e) {
				e.printStackTrace();
			}
		}
 
		return applist;
	}
 
	private class LoadApplications extends AsyncTask<Void, Void, Void> {
		private ProgressDialog progress = null;
 
		@Override
		protected Void doInBackground(Void... params) {
			applist = checkForLaunchIntent(packageManager.getInstalledApplications(PackageManager.GET_META_DATA));
			listadaptor = new ApplicationAdapter(AllAppsActivity.this,
					R.layout.snippet_list_row, applist);
 
			return null;
		}
 
		@Override
		protected void onCancelled() {
			super.onCancelled();
		}
 
		@Override
		protected void onPostExecute(Void result) {
			setListAdapter(listadaptor);
			progress.dismiss();
			super.onPostExecute(result);
		}
 
		@Override
		protected void onPreExecute() {
			progress = ProgressDialog.show(AllAppsActivity.this, null,
					"Loading application info...");
			super.onPreExecute();
		}
 
		@Override
		protected void onProgressUpdate(Void... values) {
			super.onProgressUpdate(values);
		}
	}
}

Main.java:23: error: class AllAppsActivity is public, should be declared in a file named AllAppsActivity.java
public class AllAppsActivity extends ListActivity {
       ^
Main.java:5: error: package android.app does not exist
import android.app.AlertDialog;
                  ^
Main.java:6: error: package android.app does not exist
import android.app.ListActivity;
                  ^
Main.java:7: error: package android.app does not exist
import android.app.ProgressDialog;
                  ^
Main.java:8: error: package android.content does not exist
import android.content.ActivityNotFoundException;
                      ^
Main.java:9: error: package android.content does not exist
import android.content.DialogInterface;
                      ^
Main.java:10: error: package android.content does not exist
import android.content.Intent;
                      ^
Main.java:11: error: package android.content.pm does not exist
import android.content.pm.ApplicationInfo;
                         ^
Main.java:12: error: package android.content.pm does not exist
import android.content.pm.PackageManager;
                         ^
Main.java:13: error: package android.net does not exist
import android.net.Uri;
                  ^
Main.java:14: error: package android.os does not exist
import android.os.AsyncTask;
                 ^
Main.java:15: error: package android.os does not exist
import android.os.Bundle;
                 ^
Main.java:16: error: package android.view does not exist
import android.view.Menu;
                   ^
Main.java:17: error: package android.view does not exist
import android.view.MenuInflater;
                   ^
Main.java:18: error: package android.view does not exist
import android.view.MenuItem;
                   ^
Main.java:19: error: package android.view does not exist
import android.view.View;
                   ^
Main.java:20: error: package android.widget does not exist
import android.widget.ListView;
                     ^
Main.java:21: error: package android.widget does not exist
import android.widget.Toast;
                     ^
Main.java:23: error: cannot find symbol
public class AllAppsActivity extends ListActivity {
                                     ^
  symbol: class ListActivity
Main.java:24: error: cannot find symbol
	private PackageManager packageManager = null;
	        ^
  symbol:   class PackageManager
  location: class AllAppsActivity
Main.java:25: error: cannot find symbol
	private List<ApplicationInfo> applist = null;
	             ^
  symbol:   class ApplicationInfo
  location: class AllAppsActivity
Main.java:26: error: cannot find symbol
	private ApplicationAdapter listadaptor = null;
	        ^
  symbol:   class ApplicationAdapter
  location: class AllAppsActivity
Main.java:29: error: cannot find symbol
	public void onCreate(Bundle savedInstanceState) {
	                     ^
  symbol:   class Bundle
  location: class AllAppsActivity
Main.java:38: error: cannot find symbol
	public boolean onCreateOptionsMenu(Menu menu) {
	                                   ^
  symbol:   class Menu
  location: class AllAppsActivity
Main.java:45: error: cannot find symbol
	public boolean onOptionsItemSelected(MenuItem item) {
	                                     ^
  symbol:   class MenuItem
  location: class AllAppsActivity
Main.java:86: error: cannot find symbol
	protected void onListItemClick(ListView l, View v, int position, long id) {
	                               ^
  symbol:   class ListView
  location: class AllAppsActivity
Main.java:86: error: cannot find symbol
	protected void onListItemClick(ListView l, View v, int position, long id) {
	                                           ^
  symbol:   class View
  location: class AllAppsActivity
Main.java:106: error: cannot find symbol
	private List<ApplicationInfo> checkForLaunchIntent(List<ApplicationInfo> list) {
	                                                        ^
  symbol:   class ApplicationInfo
  location: class AllAppsActivity
Main.java:106: error: cannot find symbol
	private List<ApplicationInfo> checkForLaunchIntent(List<ApplicationInfo> list) {
	             ^
  symbol:   class ApplicationInfo
  location: class AllAppsActivity
Main.java:121: error: cannot find symbol
	private class LoadApplications extends AsyncTask<Void, Void, Void> {
	                                       ^
  symbol:   class AsyncTask
  location: class AllAppsActivity
Main.java:122: error: cannot find symbol
		private ProgressDialog progress = null;
		        ^
  symbol:   class ProgressDialog
  location: class AllAppsActivity.LoadApplications
Main.java:28: error: method does not override or implement a method from a supertype
	@Override
	^
Main.java:30: error: cannot find symbol
		super.onCreate(savedInstanceState);
		^
  symbol:   variable super
  location: class AllAppsActivity
Main.java:31: error: package R does not exist
		setContentView(R.layout.activity_main);
		                ^
Main.java:33: error: cannot find symbol
		packageManager = getPackageManager();
		                 ^
  symbol:   method getPackageManager()
  location: class AllAppsActivity
Main.java:35: error: cannot find symbol
		new LoadApplications().execute();
		                      ^
  symbol:   method execute()
  location: class AllAppsActivity.LoadApplications
Main.java:39: error: cannot find symbol
		MenuInflater inflater = getMenuInflater();
		^
  symbol:   class MenuInflater
  location: class AllAppsActivity
Main.java:39: error: cannot find symbol
		MenuInflater inflater = getMenuInflater();
		                        ^
  symbol:   method getMenuInflater()
  location: class AllAppsActivity
Main.java:40: error: package R does not exist
		inflater.inflate(R.menu.menu, menu);
		                  ^
Main.java:49: error: package R does not exist
		case R.id.menu_about: {
		      ^
Main.java:55: error: cannot find symbol
			result = super.onOptionsItemSelected(item);
			         ^
  symbol:   variable super
  location: class AllAppsActivity
Main.java:65: error: package AlertDialog does not exist
		final AlertDialog.Builder builder = new AlertDialog.Builder(this);
		                 ^
Main.java:65: error: package AlertDialog does not exist
		final AlertDialog.Builder builder = new AlertDialog.Builder(this);
		                                                   ^
Main.java:66: error: package R does not exist
		builder.setTitle(getString(R.string.about_title));
		                            ^
Main.java:67: error: package R does not exist
		builder.setMessage(getString(R.string.about_desc));
		                              ^
Main.java:69: error: package DialogInterface does not exist
		builder.setPositiveButton("Know More", new DialogInterface.OnClickListener() {
		                                                          ^
Main.java:76: error: package DialogInterface does not exist
		builder.setNegativeButton("No Thanks!", new DialogInterface.OnClickListener() {
		                                                           ^
Main.java:85: error: method does not override or implement a method from a supertype
	@Override
	^
Main.java:87: error: cannot find symbol
		super.onListItemClick(l, v, position, id);
		^
  symbol:   variable super
  location: class AllAppsActivity
Main.java:89: error: cannot find symbol
		ApplicationInfo app = applist.get(position);
		^
  symbol:   class ApplicationInfo
  location: class AllAppsActivity
Main.java:91: error: cannot find symbol
			Intent intent = packageManager
			^
  symbol:   class Intent
  location: class AllAppsActivity
Main.java:97: error: cannot find symbol
		} catch (ActivityNotFoundException e) {
		         ^
  symbol:   class ActivityNotFoundException
  location: class AllAppsActivity
Main.java:99: error: cannot find symbol
					Toast.LENGTH_LONG).show();
					^
  symbol:   variable Toast
  location: class AllAppsActivity
Main.java:98: error: cannot find symbol
			Toast.makeText(AllAppsActivity.this, e.getMessage(),
			^
  symbol:   variable Toast
  location: class AllAppsActivity
Main.java:102: error: cannot find symbol
					Toast.LENGTH_LONG).show();
					^
  symbol:   variable Toast
  location: class AllAppsActivity
Main.java:101: error: cannot find symbol
			Toast.makeText(AllAppsActivity.this, e.getMessage(),
			^
  symbol:   variable Toast
  location: class AllAppsActivity
Main.java:107: error: cannot find symbol
		ArrayList<ApplicationInfo> applist = new ArrayList<ApplicationInfo>();
		          ^
  symbol:   class ApplicationInfo
  location: class AllAppsActivity
Main.java:107: error: cannot find symbol
		ArrayList<ApplicationInfo> applist = new ArrayList<ApplicationInfo>();
		                                                   ^
  symbol:   class ApplicationInfo
  location: class AllAppsActivity
Main.java:108: error: cannot find symbol
		for (ApplicationInfo info : list) {
		     ^
  symbol:   class ApplicationInfo
  location: class AllAppsActivity
Main.java:124: error: method does not override or implement a method from a supertype
		@Override
		^
Main.java:126: error: cannot find symbol
			applist = checkForLaunchIntent(packageManager.getInstalledApplications(PackageManager.GET_META_DATA));
			                                                                       ^
  symbol:   variable PackageManager
  location: class AllAppsActivity.LoadApplications
Main.java:127: error: cannot find symbol
			listadaptor = new ApplicationAdapter(AllAppsActivity.this,
			                  ^
  symbol:   class ApplicationAdapter
  location: class AllAppsActivity.LoadApplications
Main.java:128: error: package R does not exist
					R.layout.snippet_list_row, applist);
					 ^
Main.java:133: error: method does not override or implement a method from a supertype
		@Override
		^
Main.java:135: error: cannot find symbol
			super.onCancelled();
			^
  symbol:   variable super
  location: class AllAppsActivity.LoadApplications
Main.java:138: error: method does not override or implement a method from a supertype
		@Override
		^
Main.java:142: error: cannot find symbol
			super.onPostExecute(result);
			^
  symbol:   variable super
  location: class AllAppsActivity.LoadApplications
Main.java:145: error: method does not override or implement a method from a supertype
		@Override
		^
Main.java:147: error: cannot find symbol
			progress = ProgressDialog.show(AllAppsActivity.this, null,
			           ^
  symbol:   variable ProgressDialog
  location: class AllAppsActivity.LoadApplications
Main.java:149: error: cannot find symbol
			super.onPreExecute();
			^
  symbol:   variable super
  location: class AllAppsActivity.LoadApplications
Main.java:152: error: method does not override or implement a method from a supertype
		@Override
		^
Main.java:154: error: cannot find symbol
			super.onProgressUpdate(values);
			^
  symbol:   variable super
  location: class AllAppsActivity.LoadApplications
72 errors

Standard output is empty