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Share your database through ContentProviders

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rutura edited this page Apr 17, 2017 · 1 revision
  • This example shows how to share contents of your app database with other apps using ContentProviders.
  • Make sure you have the database in place.See ShareDbHelper
  • Create your ContentProvider subclass:
  • Decide on the uri of your content provider.Something like the following should do:
        *     "content://com.blikoon.app590.friendprovider/friends"
  • In your ContentProvider override the necessary methods:
    • onCreate()
    • getType()
    • query()
    • insert()
    • update()
    • delete()
  • See FriendProvider.java for details.These methods are called through your ContentProvider CONTENT_URI.
  • The ContentProvider must be declared in the manifest file
        *       <provider
                    android:name=".FriendProvider"
                    android:authorities="com.blikoon.app590.friendprovider">
                </provider>

Nothe that "com.blikoon.app590.friendprovider" matches what we have in the CONTENT_URI

  • Use LoaderManager to Asynchronously perform queries to the database though the contentProvider.The database query indirectly happens here
   @Override
    public Loader<Cursor> onCreateLoader(int id, Bundle args) {
        String[] projection = new String[]{FriendProvider.Columns._ID,
                FriendProvider.Columns.FIRST};
        return new CursorLoader(this, FriendProvider.CONTENT_URI,
                projection, null, null, null);
    }
  • Use SimpleCursorAdapter to dynamically map the results of the query to the UI list view:
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        getLoaderManager().initLoader(LOADER_LIST, null, this);
        mAdapter = new SimpleCursorAdapter(
                this,
                android.R.layout.simple_list_item_1,
                null,
                new String[]{FriendProvider.Columns.FIRST},
                new int[]{android.R.id.text1},
                0);

        ListView list = new ListView(this);
        list.setOnItemClickListener(this);
        list.setAdapter(mAdapter);

        setContentView(list);
    }

    ...

    @Override
    public void onLoadFinished(Loader<Cursor> loader, Cursor data) {
        mAdapter.swapCursor(data);
    }

    @Override
    public void onLoaderReset(Loader<Cursor> loader) {
        mAdapter.swapCursor(null);
    }
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