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Here is where the drawbacks of rolling your own become apparent. You have your blog application running, but now you want to add authentication. To add support for it, you have to add it myself. The password code is written (which also gets used in several of the examples), but adding passwords and accounts into the code means you have to write the handlers for it. Not only that, but these features are not trivial (especially if you want to make them robust). The signature for the Password module is much easier to figure out than adding the cookie support will be. val val val val val val set_file_location: string -> unit init: unit -> unit full_init: unit -> unit change: string -> string -> unit check: string -> string -> bool add: string -> string -> unit

2007 2005

As shown, the user interface looks like a simple login form. The username label is pinned to the top of the container because we set android:layout_alignParentTop to true. Similarly, the username input field is positioned below the username label because we set android:layout_below. The password label appears below the username label, the password input field appears below the password label, and the disclaimer label is pinned to the bottom of the container because we set android:layout_alignParentBottom to true. Besides these three layout attributes, you can also specify layout_above, layout_toRightOf, layout_toLeftOf, layout_centerInParent, and several more. Working with RelativeLayout is fun due to its simplicity. In fact, once you start using it, it ll become your favorite layout manager you ll find yourself going back to it over and over again.

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The layout managers that we ve discussed implement various layout strategies. In other words, each one has a specific way that it positions and orients its children on the screen. With these layout managers, you can have many controls on the screen at one time, each taking up a portion of the screen. Android also offers a layout manager that is mainly used to display a single item. This layout manager is called the FrameLayout layout manager. You mainly use this utility layout class to dynamically display a single view, but you can populate it with many items, setting one to visible while the others are invisible. Listing 4 33 demonstrates using a FrameLayout.

Even the implementation, complete with file locking and caching of information, is easier to write. exception Password_file of string;; type passwordfile = {location:string;last_loaded:float; data: (string,string) Hashtbl.t};; let file_location = ref "/var/tmp/passfle";; let passfile = ref {location=file_location.contents;last_loaded=0.; data=Hashtbl.create 10};; let load_pwfile pwf = let org_mtime = (Unix.stat pwf.location).Unix.st_mtime in if (org_mtime > pwf.last_loaded) then let fle = Unix.openfile pwf.location [Unix.O_RDONLY] 0o640 in Unix.lockf fle Unix.F_RLOCK 0; let ic = Unix.in_channel_of_descr fle in let ht = Hashtbl.create 10 in try while (true) do let line = input_line ic in let splitter = String.index line ':' in Hashtbl.replace ht (String.sub line 0 splitter) (String.sub line (splitter+1) ((String.length line) - (splitter + 1))) done; {location=pwf.location;last_loaded=org_mtime;data=ht} with End_of_file -> Unix.lockf fle Unix.F_ULOCK 0;Unix.close fle; {location=pwf.location;last_loaded=org_mtime;data=ht} else pwf;;

Figure 1-3. Android timeline In late 2007, a group of industry leaders came together around the Android Platform to form the Open Handset Alliance (http://www.openhandsetalliance.com). Some of the alliance s prominent members include Sprint Nextel T-Mobile Motorola Samsung Sony Ericsson Toshiba Vodafone Google Intel Texas Instruments

Listing 4 33. Populating a FrameLayout < xml version="1.0" encoding="utf-8" > <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/frmLayout" android:layout_width="fill_parent" android:layout_height="fill_parent"> <ImageView android:id="@+id/oneImgView" android:src="@drawable/one" android:scaleType="fitCenter" android:layout_width="fill_parent" android:layout_height="fill_parent"/> <ImageView android:id="@+id/twoImgView" android:src="@drawable/two" android:scaleType="fitCenter" android:layout_width="fill_parent" android:layout_height="fill_parent" android:visibility="gone" /> </FrameLayout> @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.frame);

ImageView one = (ImageView)this.findViewById(R.id.oneImgView); ImageView two = (ImageView)this.findViewById(R.id.twoImgView); one.setOnClickListener(new OnClickListener(){ @Override public void onClick(View view) { ImageView two = (ImageView)FramelayoutActivity.this. findViewById(R.id.twoImgView); two.setVisibility(View.VISIBLE); view.setVisibility(View.GONE); }}); two.setOnClickListener(new OnClickListener(){ @Override public void onClick(View view) { ImageView one = (ImageView)FramelayoutActivity. this.findViewById(R.id.oneImgView); one.setVisibility(View.VISIBLE); view.setVisibility(View.GONE); }}); }

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