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Application: Find a Friend
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to add Access_Location and Access_GPS permission so that you can add your current location to the map as well The full AndroidManifestxml file should appear as follows:
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< xml version="10" encoding="utf-8" > <manifest xmlns:android="http://schemasandroidcom/apk/res/android" package="android_programmers_guideFindAFriend"> <application android:icon="@drawable/icon"> <provider android:name="FriendsProvider" android:authorities="android_programmers_guideFindAFriendFriends" /> <activity android:name="FindAFriend" android:label="@string/app_name"> <intent-filter> <action android:name="androidintentactionMAIN" /> <category android:name="androidintentcategoryLAUNCHER" /> </intent-filter> <intent-filter> <action android:name="androidintentactionVIEW" /> <action android:name="androidintentactionEDIT" /> <action android:name="androidintentactionPICK" /> <category android:name="androidintentcategoryDEFAULT" /> <dataandroid:mimeType="vndandroidcursordir/ vndandroid_programmers_guidefriend" /> </intent-filter> <intent-filter> <action android:name="androidintentactionGET_CONTENT" /> <category android:name="androidintentcategoryDEFAULT" /> <dataandroid:mimeType="vndandroidcursoritem/ vndandroid_programmers_guidefriend" /> </intent-filter> </activity> <activity android:name="FriendsMap" android:label="FriendsMap"> <intent-filter> <action android:name="androidintentactionMAIN" /> <category android:name="androidintentcategoryLAUNCHER" /> </intent-filter> </activity> <activity android:name="LocationEditor" android:label="@string/title_note"> <intent-filter android:label="@string/resolve_edit"> <action android:name="androidintentactionVIEW" /> <action android:name="androidintentactionEDIT" /> <action android:name="comgoogleandroidnotepadactionEDIT_LOCATION" /> <category android:name="androidintentcategoryDEFAULT" /> <dataandroid:mimeType="vndandroidcursoritem/ vndandroid_programmers_guidefriend" /> </intent-filter>
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<intent-filter> <action android:name="androidintentactionINSERT" /> <category android:name="androidintentcategoryDEFAULT" /> <dataandroid:mimeType="vndandroidcursordir/ vndandroid_programmers_guidefriend" /> </intent-filter> </activity> <activity android:name="NameEditor" android:label="@string/title_edit_title" android:theme="@android:style/ThemeDialog"> <intent-filter android:label="@string/resolve_title"> <action android:name="comgoogleandroidnotepadactionEDIT_NAME" /> <category android:name="androidintentcategoryDEFAULT" /> <category android:name="androidintentcategoryALTERNATIVE" /> <category android:name="androidintentcategorySELECTED_ALTERNATIVE" /> <dataandroid:mimeType="vndandroidcursoritem/ vndandroid_programmers_guidefriend" /> </intent-filter> </activity> </application> <uses-permission android:name="androidpermissionACCESS_GPS"> </uses-permission><uses-permission android:name="androidpermissionACCESS_LOCATION"> </uses-permission></manifest>
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In the next section, you will create the first Activity for this project NameEditor As the name implies, this Activity will be launched when the user wishes to edit the name of a friend
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Creating the NameEditor Activity
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In this section, you will create the NameEditor Activity for the FindAFriend project This Activity will be launched from a menu item on the main FindAFriend Activity (which you have not created yet) The purpose of the NameEditor Activity will be to modify the name field of a Friend record Add a name_editorxml layout file and a corresponding NameEditorjava file to your application You will edit these files to create your Activity First, edit name_editorxml to create the layout for the Activity The Activity will hold one EditText and one Button The EditText will allow you to modify the name field, and the Button will write the results and exit If you followed this book from the beginning, you have added quite a few View layouts to XML files Therefore, I can spare you the details of each addition individually The full name_editorxml file should appear as follows:
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Application: Find a Friend
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<LinearLayout xmlns:android="http://schemasandroidcom/apk/res/android" android:layout_width="wrap_content" android:layout_height="wrap_content" android:orientation="vertical" android:paddingLeft="6dip" android:paddingRight="6dip" android:paddingBottom="3dip"> <EditText android:id="@+id/name" android:maxLines="1" android:layout_marginTop="2dip" android:layout_width="wrap_content" android:ems="25" android:layout_height="wrap_content" android:autoText="true" android:capitalize="sentences" android:scrollHorizontally="true" /> <Button android:id="@+id/ok" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="right" android:text="@string/button_ok" /> </LinearLayout>
Now, edit NameEditorjava and begin building your code You need to import your Friends class from the previous sections and import the Cursor package to help you work with the database records:
import import import import import import import androidappActivity; androiddatabaseCursor; androidnetUri; androidosBundle; androidviewView; androidwidgetButton; androidwidgetEditText;
You should establish your Activity so that you implement the ViewOnClickListener( ) This will let you override the OnClickListener( ) methods in your Activity This code sample shows the outline of your NameEditor class with some variable definitions that you will need:
public class NameEditor extends Activity implements ViewOnClickListener { public static final String EDIT_NAME_ACTION = "android_programmers_guideFindAFriendactionEDIT_NAME";
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private static final int NAME_INDEX = 1; private static final String[] PROJECTION = new String[] { FriendsFriend_ID, FriendsFriendNAME, }; Cursor mCursor; EditText mText; }
Next, you need to override some methods, starting with onCreate( ) You have seen this method overridden in other chapters Typically, it holds all the code that should be executed when the Activity is created
public void onCreate(Bundle icicle) { superonCreate(icicle); setContentView(Rlayoutname_editor); Uri uri = getIntent()getData(); mCursor = managedQuery(uri, PROJECTION, null, null); mText = (EditText) thisfindViewById(Ridname); mTextsetOnClickListener(this); Button b = (Button) findViewById(Ridok); bsetOnClickListener(this); }
Notice that, in the previous code sample, you assign layouts to their respective Views and initiate some of your variables However, you may be wondering where the data is for the name field That is, you have created a cursor, but you have not retrieved anything from it You will use the onResume( ) method for that The two methods that you will override next, onResume( ) and onPause( ), will do the work of reading from and writing to the database, respectively Within the Android life cycle, onResume( ) is called when an Activity is open and on the top of the focus onPause( ) is called when an Activity is being closed but before focus is handed to another Activity Override your onResume( ) method to read the database and retrieve the name field:
protected void onResume() { superonResume();
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