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It is the responsibility of the activity to retrieve the data from the content provider based on the URI. This is also the reason that data should be encapsulated into content providers where possible. For all actions that return data like this, we cannot use startActivity() because startActivity() does not return any result. startActivity() cannot return a result because it opens the new activity as a modal dialog in a separate thread and leaves the main thread for attending events. In other words, startActivity() is an asynchronous call with no callbacks to indicate what happened in the invoked activity. But if you want to return data, you can use a variation on startActivity() called startActivityForResult(), which comes with a callback. Let us look at the signature of the startActivityForResult() method from the Activity class:

public void startActivityForResult(Intent intent, int requestCode)

length word)} | [' ' '\t'] { `Whitespace } | eof { `Eof } and words = parse ['\n' '\013'] { `Line } | ([^ ' ' '\t' '\n' '\013']+ as word) { `Word word} | [' ' '\t'] { `Whitespace } | eof { `Eof } The preceding lexer is quite simple There are two entry points: the first one is for the first example, and the second is for the second example There are variant types with two types in the argument (the `Word type is a `Word of int and a `Word of string) The countemup function simply counts the number of words, lines, and characters in a given file (you ll see more examples later in the chapter).

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This method launches an activity from which you would like a result. When this activity exits, the source activity s onActivityResult() method will be called with the given requestCode. The signature of this callback method is

_arg0 = data.readString(); double _result = this.getQuote(_arg0); reply.writeNoException(); reply.writeDouble(_result); return true; } } return super.onTransact(code, data, reply, flags); } private static class Proxy implements com.syh.IStockQuoteService { private android.os.IBinder mRemote; Proxy(android.os.IBinder remote) { mRemote = remote; } public android.os.IBinder asBinder() { return mRemote; } public java.lang.String getInterfaceDescriptor() { return DESCRIPTOR; } public double getQuote(java.lang.String ticker) throws android.os.RemoteException { android.os.Parcel _data = android.os.Parcel.obtain(); android.os.Parcel _reply = android.os.Parcel.obtain(); double _result; try { _data.writeInterfaceToken(DESCRIPTOR); _data.writeString(ticker); mRemote.transact(Stub.TRANSACTION_getQuote, _data, _reply, 0); _reply.readException(); _result = _reply.readDouble(); } finally { _reply.recycle(); _data.recycle(); } return _result; } } static final int TRANSACTION_getQuote = (IBinder.FIRST_CALL_TRANSACTION + 0); } public double getQuote(java.lang.String ticker) throws android.os.RemoteException; }

protected void onActivityResult(int requestCode, int resultCode, Intent data)

The requestCode is what you passed in to the startActivityForResult() method. The resultCode can be RESULT_OK, RESULT_CANCELED, or a custom code. The custom codes should start at RESULT_FIRST_USER. The Intent parameter contains any additional data that the invoked activity wants to return. In the case of ACTION_PICK, the returned data in the intent points to the data URI of a single item (see Listing 3 34).

{ let rec countemup lbuf words chars lines = let tok = tokens lbuf in match tok with `Line -> countemup lbuf words (chars + 1) (lines + 1) | `Whitespace -> countemup lbuf words (chars + 1) lines | `Word n -> countemup lbuf (words + 1) (chars + n) lines | `Eof -> lines,words,chars;;.

Note the following important points regarding the generated classes: The interface we defined in the AIDL file is implemented as an interface in the generated code (that is, there is an interface named IStockQuoteService). A static final abstract class named Stub extends android.os.Binder and implements IStockQuoteService. Note that the class is an abstract class. An inner class named Proxy implements the IStockQuoteService that proxies the Stub class. The AIDL file must reside in the package where the generated files are supposed to be (as specified in the AIDL file s package declaration). Now let s move on and implement the AIDL interface in a service class.

Listing 3 34. Returning Data After Invoking an Action public static void invokePick(Activity activity) { Intent pickIntent = new Intent(Intent.ACTION_PICK); int requestCode = 1; pickIntent.setData(Uri.parse( "content://com.google.provider.NotePad/notes")); activity.startActivityForResult(pickIntent, requestCode); } protected void onActivityResult(int requestCode ,int resultCode ,Intent outputIntent) { super.onActivityResult(requestCode, resultCode, outputIntent); parseResult(this, requestCode, resultCode, outputIntent); } public static void parseResult(Activity activity , int requestCode , int resultCode

, Intent outputIntent) { if (requestCode != 1) { Log.d("Test", "Some one else called this. not us"); return; } if (resultCode != Activity.RESULT_OK) { Log.d("Result code is not ok:" + resultCode); return; } Log.d("Test", "Result code is ok:" + resultCode); Uri selectedUri = outputIntent.getData(); Log.d("Test", "The output uri:" + selectedUri.toString()); //Proceed to display the note outputIntent.setAction(Intent.VIEW); startActivity(outputIntent); }

There are several reasons why you should use objects. The first one is to hide code from the user. The users of the preceding class do not even have to know that there is some kind of initialization going on. They also do not have to know anything about the underlying implementation of the class.

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