Google Android - это несложно

Код: Выделить всё

public class MainActivity extends Activity {
	
    private Fragment fragment1, fragment2,fragment3;
    private FragmentTransaction ft;
    Button btn;
    MyHelper my;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        my = new MyHelper(this);
        SQLiteDatabase db= my.getWritableDatabase();
        fragment1= new Fragment1();
        fragment2= new Fragment2();
        fragment3= new Fragment3();
        ft = getFragmentManager().beginTransaction();
        //ft.setCustomAnimations(R.animator.slide_in_left, R.animator.slide_in_right);
        ft.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_OPEN);
        ft.replace(R.id.fragCont, fragment1);
        ft.addToBackStack(null);
        ft.commit();
        
        btn =(Button)findViewById(R.id.btn);
        
        btn.setOnClickListener(new OnClickListener() {

			@Override
			public void onClick(View v) {
		        ft = getFragmentManager().beginTransaction();
		        //ft.setCustomAnimations(R.animator.slide_in_left, R.animator.slide_in_right);
			ft.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_OPEN);
		        if(fragment1.isVisible()){
		            ft.replace(R.id.fragCont, fragment2);
		        }
		         if  (fragment2.isVisible())
		        {
		            ft.replace(R.id.fragCont, fragment3);
		        }
		         if (fragment3.isVisible()) {
			            ft.replace(R.id.fragCont, fragment1);
			        }
		        ft.commit();
			}	
        });
        
    }

Код: Выделить всё

public class Fragment3 extends Fragment {
        ListView lv;
        SQLiteDatabase db;
        ArrayList<String> str;
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, 
                                Bundle savedInstanceState) {
        View v= inflater.inflate(R.layout.fragment3, null);
           db = MainActivity.dbh.getWritableDatabase();
           str = new ArrayList<String>();
           Cursor c = db.query("mytable",null,null,null,null,null,null);
           if(c.moveToFirst()){
		    	int nameColIndex = c.getColumnIndex("login");
		    	int passColIndex = c.getColumnIndex("password");
		    	
		    	do {
		    		String name=c.getString(nameColIndex);
		    		String pass=c.getString(passColIndex);
		    		
		    		str.add(name);
		    		ArrayAdapter<String> dataAdapter = new ArrayAdapter<String>(this,
		    	            android.R.layout.simple_list_item_1, str);
		    		lv.setAdapter(dataAdapter);
		    	}
		    	while(c.moveToNext());
		    }
        return v;
    }
}

Код: Выделить всё

@Override
    public void someEvent(String s) {
        final Fragment frag2 = getFragmentManager().findFragmentById(R.id.fragment2);
        final WebView web = ((WebView) frag2.getView().findViewById(R.id.webView));
       web.loadURL(s);
}

Код: Выделить всё

public class Fragment2 extends Fragment {

    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        View v = inflater.inflate(R.layout.fragment2, null);
     
        return v;
    }
 }

Код: Выделить всё

button1.setOnClickListener(this);
button2.setOnClickListener(this);
button3.setOnClickListener(this);

Код: Выделить всё

public interface onMainMenuListener
    {
        public void onButtonClickEvent(int i);
    }

    onMainMenuListener mainMenuListener;

    @Override
    public void onAttach(Context context) {
        super.onAttach(context);

        try {

            Activity activity;
            if (context instanceof Activity){
                activity=(Activity) context;

            mainMenuListener = (onMainMenuListener) activity;

            }

        }
        catch (ClassCastException e)
        {
            throw new ClassCastException(context.toString()+" must implement onMainMenuListener");
        }
    }

Код: Выделить всё

@Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {

        View v=inflater.inflate(R.layout.mainmenu_fragment,container,false);
        Button trainButton = (Button) v.findViewById(R.id.button_train);
        trainButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                [color=#BF0000]mainMenuListener.onButtonClickEvent(1);[/color]
            }
        });


        Button youtubeButton = (Button) v.findViewById(R.id.button_youtube);
        youtubeButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                [color=#BF0000]mainMenuListener.onButtonClickEvent(2);[/color]
            }
        });


        return v;
    }