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mvtoggleSatellite(); } } protected class DrawFriendsOverlay extends Overlay{ public String[] friendName = new String[0]; public Point[] friendPoint = new Point[0]; final Paint paint = new Paint(); @Override public void draw(Canvas canvas, PixelCalculator calculator, Boolean shadow){ for(int x=0;x<friendPointlength; x++){ int[] coords = new int[2]; calculatorgetPointXY(friendPoint[x], coords); RectF oval = new RectF(coords[0] - 7, coords[1] + 7, coords[0] + 7, coords[1] - 7); paintsetTextSize(14); canvasdrawText(friendName[x], coords[0] +9, coords[1], paint); canvasdrawOval(oval, paint); } } public void addNewFriend(String name,Point point ){ int x = friendPointlength; String[] friendNameB = new String[x + 1]; Point[] friendPointB = new Point[x + 1]; Systemarraycopy(friendName, 0, friendNameB, 0, x ); Systemarraycopy(friendPoint, 0, friendPointB, 0, x); friendNameB[x] = name; friendPointB[x]= point; friendName = new String[x + 1]; friendPoint = new Point[x + 1]; Systemarraycopy(friendNameB, 0, friendName, 0, x + 1 ); Systemarraycopy(friendPointB, 0, friendPoint, 0, x + 1 );

You can see the results in Figure 12-2 when the user clicks button 1, the first message is downloaded and displayed And, as you can see in Figure 12-3, when the user clicks button 2, the second message is downloaded and displayed

} } }

The last task to finish this project is to create the main Activity, FindAFriend, which will be a shell that calls the other Activities you created in this chapter

Suppose you are all set to download a requested file or data item for the user in Ajax, but you can t find it What should you do After waiting a while for a download to occur, you should let the user know the operation timed out Otherwise, your Ajax application will just keep waiting for a nonexistent resource or a broken connection Here s an example, timeouthtml, that shows how to time out if an Ajax operation isn t successful after a certain amount of time In this case, we ll try to download a nonexistent file, datatxt, and then, when the operation fails, we ll time out and display a message box to the user We start timeouthtml with a button that the user can click to attempt to download datatxt in a function named getData:

11:

<body> <H1>Handling Ajax Timeouts</H1> <form> <input type = "button" value = "Download Message" onclick = "getData('datatxt', 'targetDiv')"> </form> </body>

To begin this section, create two files, findafriendxml and FindAFriendjava Once again, these files will hold your layout and code for the current section, respectively The layout file is very basic and contains only a TextView This TextView will be used to write results to in your list of friends The full findafriendxml file should appear as follows:

We ll add a <div> element to display the results in:

< xml version="10" encoding="utf-8" > <TextView xmlns:android="http://schemasandroidcom/apk/res/android" android:id="@android:id/text1" android:layout_width="fill_parent" android:layout_height=" android:attr/listPreferredItemHeight" android:textAppearance=" android:attr/textAppearanceLargeInverse" android:gravity="center_vertical" android:paddingLeft="27dip" />

<body> <H1>Handling Ajax Timeouts</H1> <form> <input type = "button" value = "Download Message" onclick = "getData('datatxt', 'targetDiv')"> </form> <div id="targetDiv"> <p>The fetched data will go here</p> </div> </body>

The full contents of the FindAFriendjava file follows All of the code in this file has already been covered in this chapter First, you read the database and write the results to a ListView The user is then given menu options to edit or delete entries, or launch the FriendsMap Activity Piece of cake, right

Next, we ll create the getData function:

package android_programmers_guideFindAFriend; import import import import import import import import import import import import import import import import android_programmers_guideFindAFriendFriends; androidappListActivity; androidcontentComponentName; androidcontentIntent; androidcontentContentUris; androiddatabaseCursor; androidgraphicsColor; androidnetUri; androidosBundle; androidviewMenu; androidviewView; androidviewViewMeasureSpec; androidwidgetListAdapter; androidwidgetListView; androidwidgetSimpleCursorAdapter; androidwidgetTextView;

12:

public class FindAFriend extends ListActivity {

.

public static final int DELETE_ID = MenuFIRST; public static final int INSERT_ID = MenuFIRST + 1; public static final int FIND_FRIENDS = MenuFIRST + 2; private static final String[] PROJECTION = new String[] { FriendsFriend_ID, FriendsFriendNAME}; private Cursor mCursor; @Override protected void onCreate(Bundle icicle) { superonCreate(icicle); setDefaultKeyMode(SHORTCUT_DEFAULT_KEYS); Intent intent = getIntent(); if (intentgetData() == null) { intentsetData(FriendsFriendCONTENT_URI); } setupList(); mCursor = managedQuery(getIntent()getData(), PROJECTION, null, null); ListAdapter adapter = new SimpleCursorAdapter(this, Rlayoutfindafriend_item, mCursor, new String[] {FriendsFriendNAME}, new int[] {androidRidtext1}); setListAdapter(adapter); } private void setupList() { View view = getViewInflate()inflate( androidRlayoutsimple_list_item_1, null, null); TextView v = (TextView) viewfindViewById(androidRidtext1); vsetText("X"); getListView()setBackgroundColor(ColorGRAY); vmeasure(MeasureSpecmakeMeasureSpec(ViewMeasureSpecEXACTLY, 100), MeasureSpecmakeMeasureSpec(ViewMeasureSpecUNSPECIFIED, 0)); } @Override public boolean onCreateOptionsMenu(Menu menu) { superonCreateOptionsMenu(menu);

And we ll need an XMLHttpRequest object:

11:

function getData(dataSource, divID) { var XMLHttpRequestObject = false; if (windowXMLHttpRequest) { XMLHttpRequestObject = new XMLHttpRequest(); } else if (windowActiveXObject) { XMLHttpRequestObject = new ActiveXObject("MicrosoftXMLHTTP"); } } </script>