blocks|key|3234366|text|我推荐查看Android2.x+ContactProvider的源代码。(可以在网上找到)。它们通过提供专门的视图来处理跨表查询，然后您可以在后端对这些视图运行查询。在前端，调用者可以通过单个内容提供者通过各种不同的URI访问它们。您可能还想提供一个或两个类，用于保存表字段名和URI字符串的常量。这些类既可以作为API+include提供，也可以作为类中的一部分提供，这将使消费应用程序更易于使用。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3234367|这有点复杂，所以你可能还想看看日历是怎么回事，以了解你需要做什么和不需要什么。|3234368|您应该只需要为每个数据库(而不是每个表)使用一个DB适配器和一个内容提供程序来完成大部分工作，但是如果您确实需要的话，也可以使用多个适配器/提供程序。这只会让事情变得更复杂。|3234369|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|H|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|I|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|J|8|@]|9|@]|A|$]]|$1|F|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|G|$]]

I recommend checking out the source code for the Android 2.x ContactProvider. (Which can be found online). They handle cross table queries by providing specialized views that you then run queries against on the back end. On the front end they are accessible to the caller via various different URIs through a single content provider. You'll probably also want to provide a class or two for holding constants for your table field names and URI strings. These classes could be provided either as an API include or as a drop in class, and will make it much easier for the consuming application to use.

Its a bit complex, so you might also want to check out how the calendar as well to get an idea of what you do and do not need.

You should only need a single DB adapter and a single Content provider per database (not per table) to do most of the work, but you can use multiple adapters/providers if you really want to. It just makes things a bit more complicated.

blocks|key|3020056|text|这对你来说可能有点晚了，但其他人可能会发现这很有用。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3020057|首先，您需要创建多个CONTENT_URIs|3020058|public+static+final+Uri+CONTENT_URI1+=+
++++Uri.parse("content://"%2B+PROVIDER_NAME+%2B+"/sampleuri1");
public+static+final+Uri+CONTENT_URI2+=+
++++Uri.parse("content://"%2B+PROVIDER_NAME+%2B+"/sampleuri2");|code-block|syntax|javascript|3020059|然后扩展您的URI+Matcher|3020060|private+static+final+UriMatcher+uriMatcher;
static+{
++++uriMatcher+=+new+UriMatcher(UriMatcher.NO_MATCH);
++++uriMatcher.addURI(PROVIDER_NAME,+"sampleuri1",+SAMPLE1);
++++uriMatcher.addURI(PROVIDER_NAME,+"sampleuri1/#",+SAMPLE1_ID);++++++
++++uriMatcher.addURI(PROVIDER_NAME,+"sampleuri2",+SAMPLE2);
++++uriMatcher.addURI(PROVIDER_NAME,+"sampleuri2/#",+SAMPLE2_ID);++++++
}|3020061|然后创建您的表|3020062|private+static+final+String+DATABASE_NAME+=+"sample.db";
private+static+final+String+DATABASE_TABLE1+=+"sample1";
private+static+final+String+DATABASE_TABLE2+=+"sample2";
private+static+final+int+DATABASE_VERSION+=+1;
private+static+final+String+DATABASE_CREATE1+=
++++"CREATE+TABLE+IF+NOT+EXISTS+"+%2B+DATABASE_TABLE1+%2B+
++++"+("+%2B+_ID1+%2B+"+INTEGER+PRIMARY+KEY+AUTOINCREMENT,"+%2B+
++++"data+text,+stuff+text);";
private+static+final+String+DATABASE_CREATE2+=
++++"CREATE+TABLE+IF+NOT+EXISTS+"+%2B+DATABASE_TABLE2+%2B+
++++"+("+%2B+_ID2+%2B+"+INTEGER+PRIMARY+KEY+AUTOINCREMENT,"+%2B+
++++"data+text,+stuff+text);";|3020063|不要忘记将第二个DATABASE_CREATE添加到onCreate()中|offset|length|style|CODE|3020064|您将使用switch-case模块来确定使用哪个表。这是我的插入代码|3020065|@Override
public+Uri+insert(Uri+uri,+ContentValues+values)+{
++++Uri+_uri+=+null;
++++switch+(uriMatcher.match(uri)){
++++case+SAMPLE1:
++++++++long+_ID1+=+db.insert(DATABASE_TABLE1,+"",+values);
++++++++//---if+added+successfully---
++++++++if+(_ID1+>+0)+{
++++++++++++_uri+=+ContentUris.withAppendedId(CONTENT_URI1,+_ID1);
++++++++++++getContext().getContentResolver().notifyChange(_uri,+null);++++
++++++++}
++++++++break;
++++case+SAMPLE2:
++++++++long+_ID2+=+db.insert(DATABASE_TABLE2,+"",+values);
++++++++//---if+added+successfully---
++++++++if+(_ID2+>+0)+{
++++++++++++_uri+=+ContentUris.withAppendedId(CONTENT_URI2,+_ID2);
++++++++++++getContext().getContentResolver().notifyChange(_uri,+null);++++
++++++++}
++++++++break;
++++default:+throw+new+SQLException("Failed+to+insert+row+into+"+%2B+uri);
++++}
++++return+_uri;++++++++++++++++
}|3020066|您将需要划分delete、update、getType等。无论您的提供商在哪里调用DATABASE_TABLE或CONTENT_URI，您都需要添加一个案例，并将DATABASE_TABLE1或CONTENT_URI1放在一个案例中，然后将#2放在下一个案例中，依此类推，以获得任意多个案例。|3020067|entityMap^0|0|0|0|0|0|0|0|8|F|Q|A|0|0|0|6|6|D|6|K|7|0^^$0|@$1|2|3|4|5|6|7|14|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|15|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|16|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|17|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|18|8|@]|9|@]|A|$G|H]]|$1|M|3|N|5|6|7|19|8|@]|9|@]|A|$]]|$1|O|3|P|5|F|7|1A|8|@]|9|@]|A|$G|H]]|$1|Q|3|R|5|6|7|1B|8|@$S|1C|T|1D|U|V]|$S|1E|T|1F|U|V]]|9|@]|A|$]]|$1|W|3|X|5|6|7|1G|8|@]|9|@]|A|$]]|$1|Y|3|Z|5|F|7|1H|8|@]|9|@]|A|$G|H]]|$1|10|3|11|5|6|7|1I|8|@$S|1J|T|1K|U|V]|$S|1L|T|1M|U|V]|$S|1N|T|1O|U|V]]|9|@]|A|$]]|$1|12|3|-4|5|6|7|1P|8|@]|9|@]|A|$]]]|13|$]]

It's probably a bit late for you, but others may find this useful. 

First you need to create multiple CONTENT_URIs

<pre><code>public static final Uri CONTENT_URI1 = 
 Uri.parse("content://"+ PROVIDER_NAME + "/sampleuri1");
public static final Uri CONTENT_URI2 = 
 Uri.parse("content://"+ PROVIDER_NAME + "/sampleuri2");
</code></pre>

Then you expand your URI Matcher

<pre><code>private static final UriMatcher uriMatcher;
static {
 uriMatcher = new UriMatcher(UriMatcher.NO_MATCH);
 uriMatcher.addURI(PROVIDER_NAME, "sampleuri1", SAMPLE1);
 uriMatcher.addURI(PROVIDER_NAME, "sampleuri1/#", SAMPLE1_ID); 
 uriMatcher.addURI(PROVIDER_NAME, "sampleuri2", SAMPLE2);
 uriMatcher.addURI(PROVIDER_NAME, "sampleuri2/#", SAMPLE2_ID); 
}
</code></pre>

Then create your tables

<pre><code>private static final String DATABASE_NAME = "sample.db";
private static final String DATABASE_TABLE1 = "sample1";
private static final String DATABASE_TABLE2 = "sample2";
private static final int DATABASE_VERSION = 1;
private static final String DATABASE_CREATE1 =
 "CREATE TABLE IF NOT EXISTS " + DATABASE_TABLE1 + 
 " (" + _ID1 + " INTEGER PRIMARY KEY AUTOINCREMENT," + 
 "data text, stuff text);";
private static final String DATABASE_CREATE2 =
 "CREATE TABLE IF NOT EXISTS " + DATABASE_TABLE2 + 
 " (" + _ID2 + " INTEGER PRIMARY KEY AUTOINCREMENT," + 
 "data text, stuff text);";
</code></pre>

Don't forget to add the second <code>DATABASE_CREATE</code> to <code>onCreate()</code>

You are going to use a switch-case block to determine what table is used. This is my insert code

<pre><code>@Override
public Uri insert(Uri uri, ContentValues values) {
 Uri _uri = null;
 switch (uriMatcher.match(uri)){
 case SAMPLE1:
 long _ID1 = db.insert(DATABASE_TABLE1, "", values);
 //---if added successfully---
 if (_ID1 &gt; 0) {
 _uri = ContentUris.withAppendedId(CONTENT_URI1, _ID1);
 getContext().getContentResolver().notifyChange(_uri, null); 
 }
 break;
 case SAMPLE2:
 long _ID2 = db.insert(DATABASE_TABLE2, "", values);
 //---if added successfully---
 if (_ID2 &gt; 0) {
 _uri = ContentUris.withAppendedId(CONTENT_URI2, _ID2);
 getContext().getContentResolver().notifyChange(_uri, null); 
 }
 break;
 default: throw new SQLException("Failed to insert row into " + uri);
 }
 return _uri; 
}
</code></pre>

You will need to devide up the <code>delete</code>, <code>update</code>, <code>getType</code>, etc. Wherever your provider calls for DATABASE_TABLE or CONTENT_URI you will add a case and have DATABASE_TABLE1 or CONTENT_URI1 in one and #2 in the next and so on for as many as you want.

blocks|key|3020140|text|一个ContentProvider可以为多个表提供服务，但它们应该有一定的相关性。如果您打算同步您的提供商，这将会有所不同。如果你想要单独的同步，比如说联系人，邮件或日历，你将需要为每个人提供不同的提供程序，即使它们最终在相同的数据库中或与相同的服务同步，因为同步适配器直接绑定到特定的提供程序。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|3020141|据我所知，每个数据库只能使用一个SQLiteOpenHelper，因为它将其元信息存储在数据库中的一个表中。因此，如果您的ContentProviders访问相同的数据库，您将不得不以某种方式共享Helper。|3020142|entityMap^0|2|F|0|1P|G|0^^$0|@$1|2|3|4|5|6|7|J|8|@$9|K|A|L|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|M|8|@$9|N|A|O|B|C]]|D|@]|E|$]]|$1|H|3|-4|5|6|7|P|8|@]|D|@]|E|$]]]|I|$]]

One <code>ContentProvider</code> can serve multiple tables, but they should be somewhat related. It will make a difference if you intend to sync your providers. If you want seperate syncs for, let's say Contacts, Mail or Calendar, you will need different providers for each of them, even if they end up being in the same database or are synced with the same service, because Sync Adapters are tied directly to a particular provider.

As far as I can tell, you can only use a single SQLiteOpenHelper per database, though, since it stores its meta information in a table within the database. So if your <code>ContentProviders</code> access the same database, you'll have to share the Helper somewhow.

blocks|key|3020167|text|注意:这是对Opy提供的答案的澄清/修改。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3020168|这种方法使用switch语句细分insert、delete、update和getType方法，以便处理每个单独的表。您将使用一个案例来标识要引用的每个表(或uri)。然后，每个案例映射到您的一个表或URI。例如，在案例#1中为您的应用程序使用的所有表选择了TABLE1或URI1等。|offset|length|style|CODE|BOLD|3020169|下面是该方法的一个示例。这适用于insert方法。它的实现与Opy略有不同，但执行相同的功能。您可以选择您喜欢的样式。我还想确保insert返回一个值，即使表插入失败。在这种情况下，它返回一个-1。|3020170|++@Override
++public+Uri+insert(Uri+uri,+ContentValues+values)+{
++++int+uriType+=+sURIMatcher.match(uri);
++++SQLiteDatabase+sqlDB;+

++++long+id+=+0;
++++switch+(uriType){+
++++++++case+TABLE1:+
++++++++++++sqlDB+=+Table1Database.getWritableDatabase();
++++++++++++id+=+sqlDB.insert(Table1.TABLE_NAME,+null,+values);+
++++++++++++getContext().getContentResolver().notifyChange(uri,+null);
++++++++++++return+Uri.parse(BASE_PATH1+%2B+"/"+%2B+id);
++++++++case+TABLE2:+
++++++++++++sqlDB+=+Table2Database.getWritableDatabase();
++++++++++++id+=+sqlDB.insert(Table2.TABLE_NAME,+null,+values);+
++++++++++++getContext().getContentResolver().notifyChange(uri,+null);
++++++++++++return+Uri.parse(BASE_PATH2+%2B+"/"+%2B+id);
++++++++default:+
++++++++++++throw+new+SQLException("Failed+to+insert+row+into+"+%2B+uri);+
++++++++++++return+-1;
++++}+++++++
++}++//+[END+insert]|code-block|syntax|javascript|3020171|entityMap^0|0|G|6|N|6|U|6|11|7|3K|6|3R|4|0|2O|2|0|0^^$0|@$1|2|3|4|5|6|7|R|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|S|8|@$D|T|E|U|F|G]|$D|V|E|W|F|G]|$D|X|E|Y|F|G]|$D|Z|E|10|F|G]|$D|11|E|12|F|H]|$D|13|E|14|F|H]]|9|@]|A|$]]|$1|I|3|J|5|6|7|15|8|@$D|16|E|17|F|G]]|9|@]|A|$]]|$1|K|3|L|5|M|7|18|8|@]|9|@]|A|$N|O]]|$1|P|3|-4|5|6|7|19|8|@]|9|@]|A|$]]]|Q|$]]

Note: This is a clarification/modification to the answer provide by Opy. 

This approach subdivides each of the <code>insert</code>, <code>delete</code>, <code>update</code>, and <code>getType</code> methods with switch statements in order to handle each of your individual tables. You'll use a CASE to identify each table (or uri) to be referenced. Each CASE then maps to one of your tables or URI's. E.g., TABLE1 or URI1 is selected in CASE #1, etc. for all the tables your app employs.

Here's an example of the approach. This is for the insert method. It's implemented a bit differently from Opy's but performs the same function. You can select the style you prefer. I also wanted to be sure insert returns a value even if the table insertion fails. In that case it returns a <code>-1</code>. 

<pre><code> @Override
 public Uri insert(Uri uri, ContentValues values) {
 int uriType = sURIMatcher.match(uri);
 SQLiteDatabase sqlDB; 

 long id = 0;
 switch (uriType){ 
 case TABLE1: 
 sqlDB = Table1Database.getWritableDatabase();
 id = sqlDB.insert(Table1.TABLE_NAME, null, values); 
 getContext().getContentResolver().notifyChange(uri, null);
 return Uri.parse(BASE_PATH1 + "/" + id);
 case TABLE2: 
 sqlDB = Table2Database.getWritableDatabase();
 id = sqlDB.insert(Table2.TABLE_NAME, null, values); 
 getContext().getContentResolver().notifyChange(uri, null);
 return Uri.parse(BASE_PATH2 + "/" + id);
 default: 
 throw new SQLException("Failed to insert row into " + uri); 
 return -1;
 } 
 } // [END insert]
</code></pre>

blocks|key|3020211|text|我为ContentProvider找到了最好的演示和解释，我认为它遵循了安卓标准。|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|3020212|约定类|3020213|+/**
+++*+The+Content+Authority+is+a+name+for+the+entire+content+provider,+similar+to+the+relationship
+++*+between+a+domain+name+and+its+website.+A+convenient+string+to+use+for+content+authority+is
+++*+the+package+name+for+the+app,+since+it+is+guaranteed+to+be+unique+on+the+device.
+++*/
++public+static+final+String+CONTENT_AUTHORITY+=+"com.androidessence.moviedatabase";

++/**
+++*+The+content+authority+is+used+to+create+the+base+of+all+URIs+which+apps+will+use+to
+++*+contact+this+content+provider.
+++*/
++private+static+final+Uri+BASE_CONTENT_URI+=+Uri.parse("content://"+%2B+CONTENT_AUTHORITY);

++/**
+++*+A+list+of+possible+paths+that+will+be+appended+to+the+base+URI+for+each+of+the+different
+++*+tables.
+++*/
++public+static+final+String+PATH_MOVIE+=+"movie";
++public+static+final+String+PATH_GENRE+=+"genre";|code-block|syntax|javascript|3020214|和内部类：|3020215|+/**
+++*+Create+one+class+for+each+table+that+handles+all+information+regarding+the+table+schema+and
+++*+the+URIs+related+to+it.
+++*/
++public+static+final+class+MovieEntry+implements+BaseColumns+{
++++++//+Content+URI+represents+the+base+location+for+the+table
++++++public+static+final+Uri+CONTENT_URI+=
++++++++++++++BASE_CONTENT_URI.buildUpon().appendPath(PATH_MOVIE).build();

++++++//+These+are+special+type+prefixes+that+specify+if+a+URI+returns+a+list+or+a+specific+item
++++++public+static+final+String+CONTENT_TYPE+=
++++++++++++++"vnd.android.cursor.dir/"+%2B+CONTENT_URI++%2B+"/"+%2B+PATH_MOVIE;
++++++public+static+final+String+CONTENT_ITEM_TYPE+=
++++++++++++++"vnd.android.cursor.item/"+%2B+CONTENT_URI+%2B+"/"+%2B+PATH_MOVIE;

++++++//+Define+the+table+schema
++++++public+static+final+String+TABLE_NAME+=+"movieTable";
++++++public+static+final+String+COLUMN_NAME+=+"movieName";
++++++public+static+final+String+COLUMN_RELEASE_DATE+=+"movieReleaseDate";
++++++public+static+final+String+COLUMN_GENRE+=+"movieGenre";

++++++//+Define+a+function+to+build+a+URI+to+find+a+specific+movie+by+it's+identifier
++++++public+static+Uri+buildMovieUri(long+id){
++++++++++return+ContentUris.withAppendedId(CONTENT_URI,+id);
++++++}
++}

++public+static+final+class+GenreEntry+implements+BaseColumns{
++++++public+static+final+Uri+CONTENT_URI+=
++++++++++++++BASE_CONTENT_URI.buildUpon().appendPath(PATH_GENRE).build();

++++++public+static+final+String+CONTENT_TYPE+=
++++++++++++++"vnd.android.cursor.dir/"+%2B+CONTENT_URI+%2B+"/"+%2B+PATH_GENRE;
++++++public+static+final+String+CONTENT_ITEM_TYPE+=
++++++++++++++"vnd.android.cursor.item/"+%2B+CONTENT_URI+%2B+"/"+%2B+PATH_GENRE;

++++++public+static+final+String+TABLE_NAME+=+"genreTable";
++++++public+static+final+String+COLUMN_NAME+=+"genreName";

++++++public+static+Uri+buildGenreUri(long+id){
++++++++++return+ContentUris.withAppendedId(CONTENT_URI,+id);
++++++}
++}|3020216|现在使用SQLiteOpenHelper创建数据库|3020217|public+class+MovieDBHelper+extends+SQLiteOpenHelper{
++++/**
+++++*+Defines+the+database+version.+This+variable+must+be+incremented+in+order+for+onUpdate+to
+++++*+be+called+when+necessary.
+++++*/
++++private+static+final+int+DATABASE_VERSION+=+1;
++++/**
+++++*+The+name+of+the+database+on+the+device.
+++++*/
++++private+static+final+String+DATABASE_NAME+=+"movieList.db";

++++/**
+++++*+Default+constructor.
+++++*+@param+context+The+application+context+using+this+database.
+++++*/
++++public+MovieDBHelper(Context+context){
++++++++super(context,+DATABASE_NAME,+null,+DATABASE_VERSION);
++++}

++++/**
+++++*+Called+when+the+database+is+first+created.
+++++*+@param+db+The+database+being+created,+which+all+SQL+statements+will+be+executed+on.
+++++*/
++++@Override
++++public+void+onCreate(SQLiteDatabase+db)+{
++++++++addGenreTable(db);
++++++++addMovieTable(db);
++++}

++++/**
+++++*+Called+whenever+DATABASE_VERSION+is+incremented.+This+is+used+whenever+schema+changes+need
+++++*+to+be+made+or+new+tables+are+added.
+++++*+@param+db+The+database+being+updated.
+++++*+@param+oldVersion+The+previous+version+of+the+database.+Used+to+determine+whether+or+not
+++++*+++++++++++++++++++certain+updates+should+be+run.
+++++*+@param+newVersion+The+new+version+of+the+database.
+++++*/
++++@Override
++++public+void+onUpgrade(SQLiteDatabase+db,+int+oldVersion,+int+newVersion)+{

++++}

++++/**
+++++*+Inserts+the+genre+table+into+the+database.
+++++*+@param+db+The+SQLiteDatabase+the+table+is+being+inserted+into.
+++++*/
++++private+void+addGenreTable(SQLiteDatabase+db){
++++++++db.execSQL(
++++++++++++++++"CREATE+TABLE+"+%2B+MovieContract.GenreEntry.TABLE_NAME+%2B+"+("+%2B
++++++++++++++++++++++++MovieContract.GenreEntry._ID+%2B+"+INTEGER+PRIMARY+KEY,+"+%2B
++++++++++++++++++++++++MovieContract.GenreEntry.COLUMN_NAME+%2B+"+TEXT+UNIQUE+NOT+NULL);"
++++++++);
++++}

++++/**
+++++*+Inserts+the+movie+table+into+the+database.
+++++*+@param+db+The+SQLiteDatabase+the+table+is+being+inserted+into.
+++++*/
++++private+void+addMovieTable(SQLiteDatabase+db){
++++++++db.execSQL(
++++++++++++++++"CREATE+TABLE+"+%2B+MovieContract.MovieEntry.TABLE_NAME+%2B+"+("+%2B
++++++++++++++++++++++++MovieContract.MovieEntry._ID+%2B+"+INTEGER+PRIMARY+KEY,+"+%2B
++++++++++++++++++++++++MovieContract.MovieEntry.COLUMN_NAME+%2B+"+TEXT+NOT+NULL,+"+%2B
++++++++++++++++++++++++MovieContract.MovieEntry.COLUMN_RELEASE_DATE+%2B+"+TEXT+NOT+NULL,+"+%2B
++++++++++++++++++++++++MovieContract.MovieEntry.COLUMN_GENRE+%2B+"+INTEGER+NOT+NULL,+"+%2B
++++++++++++++++++++++++"FOREIGN+KEY+("+%2B+MovieContract.MovieEntry.COLUMN_GENRE+%2B+")+"+%2B
++++++++++++++++++++++++"REFERENCES+"+%2B+MovieContract.GenreEntry.TABLE_NAME+%2B+"+("+%2B+MovieContract.GenreEntry._ID+%2B+"));"
++++++++);
++++}
}|3020218|内容提供商：|3020219|public+class+MovieProvider+extends+ContentProvider+{
++++//+Use+an+int+for+each+URI+we+will+run,+this+represents+the+different+queries
++++private+static+final+int+GENRE+=+100;
++++private+static+final+int+GENRE_ID+=+101;
++++private+static+final+int+MOVIE+=+200;
++++private+static+final+int+MOVIE_ID+=+201;

++++private+static+final+UriMatcher+sUriMatcher+=+buildUriMatcher();
++++private+MovieDBHelper+mOpenHelper;

++++@Override
++++public+boolean+onCreate()+{
++++++++mOpenHelper+=+new+MovieDBHelper(getContext());
++++++++return+true;
++++}

++++/**
+++++*+Builds+a+UriMatcher+that+is+used+to+determine+witch+database+request+is+being+made.
+++++*/
++++public+static+UriMatcher+buildUriMatcher(){
++++++++String+content+=+MovieContract.CONTENT_AUTHORITY;

++++++++//+All+paths+to+the+UriMatcher+have+a+corresponding+code+to+return
++++++++//+when+a+match+is+found+(the+ints+above).
++++++++UriMatcher+matcher+=+new+UriMatcher(UriMatcher.NO_MATCH);
++++++++matcher.addURI(content,+MovieContract.PATH_GENRE,+GENRE);
++++++++matcher.addURI(content,+MovieContract.PATH_GENRE+%2B+"/#",+GENRE_ID);
++++++++matcher.addURI(content,+MovieContract.PATH_MOVIE,+MOVIE);
++++++++matcher.addURI(content,+MovieContract.PATH_MOVIE+%2B+"/#",+MOVIE_ID);

++++++++return+matcher;
++++}

++++@Override
++++public+String+getType(Uri+uri)+{
++++++++switch(sUriMatcher.match(uri)){
++++++++++++case+GENRE:
++++++++++++++++return+MovieContract.GenreEntry.CONTENT_TYPE;
++++++++++++case+GENRE_ID:
++++++++++++++++return+MovieContract.GenreEntry.CONTENT_ITEM_TYPE;
++++++++++++case+MOVIE:
++++++++++++++++return+MovieContract.MovieEntry.CONTENT_TYPE;
++++++++++++case+MOVIE_ID:
++++++++++++++++return+MovieContract.MovieEntry.CONTENT_ITEM_TYPE;
++++++++++++default:
++++++++++++++++throw+new+UnsupportedOperationException("Unknown+uri:+"+%2B+uri);
++++++++}
++++}

++++@Override
++++public+Cursor+query(Uri+uri,+String[]+projection,+String+selection,+String[]+selectionArgs,+String+sortOrder)+{
++++++++final+SQLiteDatabase+db+=+mOpenHelper.getWritableDatabase();
++++++++Cursor+retCursor;
++++++++switch(sUriMatcher.match(uri)){
++++++++++++case+GENRE:
++++++++++++++++retCursor+=+db.query(
++++++++++++++++++++++++MovieContract.GenreEntry.TABLE_NAME,
++++++++++++++++++++++++projection,
++++++++++++++++++++++++selection,
++++++++++++++++++++++++selectionArgs,
++++++++++++++++++++++++null,
++++++++++++++++++++++++null,
++++++++++++++++++++++++sortOrder
++++++++++++++++);
++++++++++++++++break;
++++++++++++case+GENRE_ID:
++++++++++++++++long+_id+=+ContentUris.parseId(uri);
++++++++++++++++retCursor+=+db.query(
++++++++++++++++++++++++MovieContract.GenreEntry.TABLE_NAME,
++++++++++++++++++++++++projection,
++++++++++++++++++++++++MovieContract.GenreEntry._ID+%2B+"+=+?",
++++++++++++++++++++++++new+String[]{String.valueOf(_id)},
++++++++++++++++++++++++null,
++++++++++++++++++++++++null,
++++++++++++++++++++++++sortOrder
++++++++++++++++);
++++++++++++++++break;
++++++++++++case+MOVIE:
++++++++++++++++retCursor+=+db.query(
++++++++++++++++++++++++MovieContract.MovieEntry.TABLE_NAME,
++++++++++++++++++++++++projection,
++++++++++++++++++++++++selection,
++++++++++++++++++++++++selectionArgs,
++++++++++++++++++++++++null,
++++++++++++++++++++++++null,
++++++++++++++++++++++++sortOrder
++++++++++++++++);
++++++++++++++++break;
++++++++++++case+MOVIE_ID:
++++++++++++++++_id+=+ContentUris.parseId(uri);
++++++++++++++++retCursor+=+db.query(
++++++++++++++++++++++++MovieContract.MovieEntry.TABLE_NAME,
++++++++++++++++++++++++projection,
++++++++++++++++++++++++MovieContract.MovieEntry._ID+%2B+"+=+?",
++++++++++++++++++++++++new+String[]{String.valueOf(_id)},
++++++++++++++++++++++++null,
++++++++++++++++++++++++null,
++++++++++++++++++++++++sortOrder
++++++++++++++++);
++++++++++++++++break;
++++++++++++default:
++++++++++++++++throw+new+UnsupportedOperationException("Unknown+uri:+"+%2B+uri);
++++++++}

++++++++//+Set+the+notification+URI+for+the+cursor+to+the+one+passed+into+the+function.+This
++++++++//+causes+the+cursor+to+register+a+content+observer+to+watch+for+changes+that+happen+to
++++++++//+this+URI+and+any+of+it's+descendants.+By+descendants,+we+mean+any+URI+that+begins
++++++++//+with+this+path.
++++++++retCursor.setNotificationUri(getContext().getContentResolver(),+uri);
++++++++return+retCursor;
++++}

++++@Override
++++public+Uri+insert(Uri+uri,+ContentValues+values)+{
++++++++final+SQLiteDatabase+db+=+mOpenHelper.getWritableDatabase();
++++++++long+_id;
++++++++Uri+returnUri;

++++++++switch(sUriMatcher.match(uri)){
++++++++++++case+GENRE:
++++++++++++++++_id+=+db.insert(MovieContract.GenreEntry.TABLE_NAME,+null,+values);
++++++++++++++++if(_id+>+0){
++++++++++++++++++++returnUri+=++MovieContract.GenreEntry.buildGenreUri(_id);
++++++++++++++++}+else{
++++++++++++++++++++throw+new+UnsupportedOperationException("Unable+to+insert+rows+into:+"+%2B+uri);
++++++++++++++++}
++++++++++++++++break;
++++++++++++case+MOVIE:
++++++++++++++++_id+=+db.insert(MovieContract.MovieEntry.TABLE_NAME,+null,+values);
++++++++++++++++if(_id+>+0){
++++++++++++++++++++returnUri+=+MovieContract.MovieEntry.buildMovieUri(_id);
++++++++++++++++}+else{
++++++++++++++++++++throw+new+UnsupportedOperationException("Unable+to+insert+rows+into:+"+%2B+uri);
++++++++++++++++}
++++++++++++++++break;
++++++++++++default:
++++++++++++++++throw+new+UnsupportedOperationException("Unknown+uri:+"+%2B+uri);
++++++++}

++++++++//+Use+this+on+the+URI+passed+into+the+function+to+notify+any+observers+that+the+uri+has
++++++++//+changed.
++++++++getContext().getContentResolver().notifyChange(uri,+null);
++++++++return+returnUri;
++++}

++++@Override
++++public+int+delete(Uri+uri,+String+selection,+String[]+selectionArgs)+{
++++++++final+SQLiteDatabase+db+=+mOpenHelper.getWritableDatabase();
++++++++int+rows;+//+Number+of+rows+effected

++++++++switch(sUriMatcher.match(uri)){
++++++++++++case+GENRE:
++++++++++++++++rows+=+db.delete(MovieContract.GenreEntry.TABLE_NAME,+selection,+selectionArgs);
++++++++++++++++break;
++++++++++++case+MOVIE:
++++++++++++++++rows+=+db.delete(MovieContract.MovieEntry.TABLE_NAME,+selection,+selectionArgs);
++++++++++++++++break;
++++++++++++default:
++++++++++++++++throw+new+UnsupportedOperationException("Unknown+uri:+"+%2B+uri);
++++++++}

++++++++//+Because+null+could+delete+all+rows:
++++++++if(selection+==+null+%7C%7C+rows+!=+0){
++++++++++++getContext().getContentResolver().notifyChange(uri,+null);
++++++++}

++++++++return+rows;
++++}

++++@Override
++++public+int+update(Uri+uri,+ContentValues+values,+String+selection,+String[]+selectionArgs)+{
++++++++final+SQLiteDatabase+db+=+mOpenHelper.getWritableDatabase();
++++++++int+rows;

++++++++switch(sUriMatcher.match(uri)){
++++++++++++case+GENRE:
++++++++++++++++rows+=+db.update(MovieContract.GenreEntry.TABLE_NAME,+values,+selection,+selectionArgs);
++++++++++++++++break;
++++++++++++case+MOVIE:
++++++++++++++++rows+=+db.update(MovieContract.MovieEntry.TABLE_NAME,+values,+selection,+selectionArgs);
++++++++++++++++break;
++++++++++++default:
++++++++++++++++throw+new+UnsupportedOperationException("Unknown+uri:+"+%2B+uri);
++++++++}

++++++++if(rows+!=+0){
++++++++++++getContext().getContentResolver().notifyChange(uri,+null);
++++++++}

++++++++return+rows;
++++}
}|3020220|我希望它能对你有所帮助。|3020221|GitHub上的演示：+|3020222|全文:+|3020223|参考：|3020224|3020225|http://code.tutsplus.com/tutorials/android-sdk_content-providers--mobile-5549|unordered-list-item|3020226|http://www.grokkingandroid.com/android-tutorial-writing-your-own-content-provider/|3020227|http://developer.android.com/guide/topics/providers/content-providers.html|3020228|https://thenewcircle.com/s/post/1375/android_content_provider_tutorial|3020229|http://www.grokkingandroid.com/android-tutorial-content-provider-basics/|3020230|http://androidessence.com/|3020231|3020232|注意:我复制代码只是因为如果演示或文章的链接可能会在未来被删除。|3020233|entityMap|0|LINK|mutability|MUTABLE|url|1|2|3|4|5^0|2|F|0|0|3|0|0|1|4|0|0|4|G|0|0|0|6|0|0|0|0|B|0|0|3|0|0|3|0|0|0|25|0|0|0|2A|1|0|0|22|2|0|0|1Y|3|0|0|20|4|0|0|Q|5|0|0|0^^$0|@$1|2|3|4|5|6|7|1Z|8|@$9|20|A|21|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|22|8|@$9|23|A|24|B|C]]|D|@]|E|$]]|$1|H|3|I|5|J|7|25|8|@]|D|@]|E|$K|L]]|$1|M|3|N|5|6|7|26|8|@$9|27|A|28|B|C]]|D|@]|E|$]]|$1|O|3|P|5|J|7|29|8|@]|D|@]|E|$K|L]]|$1|Q|3|R|5|6|7|2A|8|@$9|2B|A|2C|B|C]]|D|@]|E|$]]|$1|S|3|T|5|J|7|2D|8|@]|D|@]|E|$K|L]]|$1|U|3|V|5|6|7|2E|8|@$9|2F|A|2G|B|C]]|D|@]|E|$]]|$1|W|3|X|5|J|7|2H|8|@]|D|@]|E|$K|L]]|$1|Y|3|Z|5|6|7|2I|8|@]|D|@]|E|$]]|$1|10|3|11|5|6|7|2J|8|@$9|2K|A|2L|B|C]]|D|@]|E|$]]|$1|12|3|13|5|6|7|2M|8|@$9|2N|A|2O|B|C]]|D|@]|E|$]]|$1|14|3|15|5|6|7|2P|8|@$9|2Q|A|2R|B|C]]|D|@]|E|$]]|$1|16|3|-4|5|6|7|2S|8|@]|D|@]|E|$]]|$1|17|3|18|5|19|7|2T|8|@]|D|@$9|2U|A|2V|1|2W]]|E|$]]|$1|1A|3|1B|5|19|7|2X|8|@]|D|@$9|2Y|A|2Z|1|30]]|E|$]]|$1|1C|3|1D|5|19|7|31|8|@]|D|@$9|32|A|33|1|34]]|E|$]]|$1|1E|3|1F|5|19|7|35|8|@]|D|@$9|36|A|37|1|38]]|E|$]]|$1|1G|3|1H|5|19|7|39|8|@]|D|@$9|3A|A|3B|1|3C]]|E|$]]|$1|1I|3|1J|5|19|7|3D|8|@]|D|@$9|3E|A|3F|1|3G]]|E|$]]|$1|1K|3|-4|5|6|7|3H|8|@]|D|@]|E|$]]|$1|1L|3|1M|5|6|7|3I|8|@]|D|@]|E|$]]|$1|1N|3|-4|5|6|7|3J|8|@]|D|@]|E|$]]]|1O|$1P|$5|1Q|1R|1S|E|$1T|18]]|1U|$5|1Q|1R|1S|E|$1T|1B]]|1V|$5|1Q|1R|1S|E|$1T|1D]]|1W|$5|1Q|1R|1S|E|$1T|1F]]|1X|$5|1Q|1R|1S|E|$1T|1H]]|1Y|$5|1Q|1R|1S|E|$1T|1J]]]]

I found best demo and explanation for ContentProvider and I think it has followed Android Standards.

Contract Classes

<pre><code> /**
 * The Content Authority is a name for the entire content provider, similar to the relationship
 * between a domain name and its website. A convenient string to use for content authority is
 * the package name for the app, since it is guaranteed to be unique on the device.
 */
 public static final String CONTENT_AUTHORITY = "com.androidessence.moviedatabase";

 /**
 * The content authority is used to create the base of all URIs which apps will use to
 * contact this content provider.
 */
 private static final Uri BASE_CONTENT_URI = Uri.parse("content://" + CONTENT_AUTHORITY);

 /**
 * A list of possible paths that will be appended to the base URI for each of the different
 * tables.
 */
 public static final String PATH_MOVIE = "movie";
 public static final String PATH_GENRE = "genre";
</code></pre>

and Inner Classes: 

<pre><code> /**
 * Create one class for each table that handles all information regarding the table schema and
 * the URIs related to it.
 */
 public static final class MovieEntry implements BaseColumns {
 // Content URI represents the base location for the table
 public static final Uri CONTENT_URI =
 BASE_CONTENT_URI.buildUpon().appendPath(PATH_MOVIE).build();

 // These are special type prefixes that specify if a URI returns a list or a specific item
 public static final String CONTENT_TYPE =
 "vnd.android.cursor.dir/" + CONTENT_URI + "/" + PATH_MOVIE;
 public static final String CONTENT_ITEM_TYPE =
 "vnd.android.cursor.item/" + CONTENT_URI + "/" + PATH_MOVIE;

 // Define the table schema
 public static final String TABLE_NAME = "movieTable";
 public static final String COLUMN_NAME = "movieName";
 public static final String COLUMN_RELEASE_DATE = "movieReleaseDate";
 public static final String COLUMN_GENRE = "movieGenre";

 // Define a function to build a URI to find a specific movie by it's identifier
 public static Uri buildMovieUri(long id){
 return ContentUris.withAppendedId(CONTENT_URI, id);
 }
 }

 public static final class GenreEntry implements BaseColumns{
 public static final Uri CONTENT_URI =
 BASE_CONTENT_URI.buildUpon().appendPath(PATH_GENRE).build();

 public static final String CONTENT_TYPE =
 "vnd.android.cursor.dir/" + CONTENT_URI + "/" + PATH_GENRE;
 public static final String CONTENT_ITEM_TYPE =
 "vnd.android.cursor.item/" + CONTENT_URI + "/" + PATH_GENRE;

 public static final String TABLE_NAME = "genreTable";
 public static final String COLUMN_NAME = "genreName";

 public static Uri buildGenreUri(long id){
 return ContentUris.withAppendedId(CONTENT_URI, id);
 }
 }
</code></pre>

Now creating Database using SQLiteOpenHelper:

<pre><code>public class MovieDBHelper extends SQLiteOpenHelper{
 /**
 * Defines the database version. This variable must be incremented in order for onUpdate to
 * be called when necessary.
 */
 private static final int DATABASE_VERSION = 1;
 /**
 * The name of the database on the device.
 */
 private static final String DATABASE_NAME = "movieList.db";

 /**
 * Default constructor.
 * @param context The application context using this database.
 */
 public MovieDBHelper(Context context){
 super(context, DATABASE_NAME, null, DATABASE_VERSION);
 }

 /**
 * Called when the database is first created.
 * @param db The database being created, which all SQL statements will be executed on.
 */
 @Override
 public void onCreate(SQLiteDatabase db) {
 addGenreTable(db);
 addMovieTable(db);
 }

 /**
 * Called whenever DATABASE_VERSION is incremented. This is used whenever schema changes need
 * to be made or new tables are added.
 * @param db The database being updated.
 * @param oldVersion The previous version of the database. Used to determine whether or not
 * certain updates should be run.
 * @param newVersion The new version of the database.
 */
 @Override
 public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {

 }

 /**
 * Inserts the genre table into the database.
 * @param db The SQLiteDatabase the table is being inserted into.
 */
 private void addGenreTable(SQLiteDatabase db){
 db.execSQL(
 "CREATE TABLE " + MovieContract.GenreEntry.TABLE_NAME + " (" +
 MovieContract.GenreEntry._ID + " INTEGER PRIMARY KEY, " +
 MovieContract.GenreEntry.COLUMN_NAME + " TEXT UNIQUE NOT NULL);"
 );
 }

 /**
 * Inserts the movie table into the database.
 * @param db The SQLiteDatabase the table is being inserted into.
 */
 private void addMovieTable(SQLiteDatabase db){
 db.execSQL(
 "CREATE TABLE " + MovieContract.MovieEntry.TABLE_NAME + " (" +
 MovieContract.MovieEntry._ID + " INTEGER PRIMARY KEY, " +
 MovieContract.MovieEntry.COLUMN_NAME + " TEXT NOT NULL, " +
 MovieContract.MovieEntry.COLUMN_RELEASE_DATE + " TEXT NOT NULL, " +
 MovieContract.MovieEntry.COLUMN_GENRE + " INTEGER NOT NULL, " +
 "FOREIGN KEY (" + MovieContract.MovieEntry.COLUMN_GENRE + ") " +
 "REFERENCES " + MovieContract.GenreEntry.TABLE_NAME + " (" + MovieContract.GenreEntry._ID + "));"
 );
 }
}
</code></pre>

Content Provider:

<pre><code>public class MovieProvider extends ContentProvider {
 // Use an int for each URI we will run, this represents the different queries
 private static final int GENRE = 100;
 private static final int GENRE_ID = 101;
 private static final int MOVIE = 200;
 private static final int MOVIE_ID = 201;

 private static final UriMatcher sUriMatcher = buildUriMatcher();
 private MovieDBHelper mOpenHelper;

 @Override
 public boolean onCreate() {
 mOpenHelper = new MovieDBHelper(getContext());
 return true;
 }

 /**
 * Builds a UriMatcher that is used to determine witch database request is being made.
 */
 public static UriMatcher buildUriMatcher(){
 String content = MovieContract.CONTENT_AUTHORITY;

 // All paths to the UriMatcher have a corresponding code to return
 // when a match is found (the ints above).
 UriMatcher matcher = new UriMatcher(UriMatcher.NO_MATCH);
 matcher.addURI(content, MovieContract.PATH_GENRE, GENRE);
 matcher.addURI(content, MovieContract.PATH_GENRE + "/#", GENRE_ID);
 matcher.addURI(content, MovieContract.PATH_MOVIE, MOVIE);
 matcher.addURI(content, MovieContract.PATH_MOVIE + "/#", MOVIE_ID);

 return matcher;
 }

 @Override
 public String getType(Uri uri) {
 switch(sUriMatcher.match(uri)){
 case GENRE:
 return MovieContract.GenreEntry.CONTENT_TYPE;
 case GENRE_ID:
 return MovieContract.GenreEntry.CONTENT_ITEM_TYPE;
 case MOVIE:
 return MovieContract.MovieEntry.CONTENT_TYPE;
 case MOVIE_ID:
 return MovieContract.MovieEntry.CONTENT_ITEM_TYPE;
 default:
 throw new UnsupportedOperationException("Unknown uri: " + uri);
 }
 }

 @Override
 public Cursor query(Uri uri, String[] projection, String selection, String[] selectionArgs, String sortOrder) {
 final SQLiteDatabase db = mOpenHelper.getWritableDatabase();
 Cursor retCursor;
 switch(sUriMatcher.match(uri)){
 case GENRE:
 retCursor = db.query(
 MovieContract.GenreEntry.TABLE_NAME,
 projection,
 selection,
 selectionArgs,
 null,
 null,
 sortOrder
 );
 break;
 case GENRE_ID:
 long _id = ContentUris.parseId(uri);
 retCursor = db.query(
 MovieContract.GenreEntry.TABLE_NAME,
 projection,
 MovieContract.GenreEntry._ID + " = ?",
 new String[]{String.valueOf(_id)},
 null,
 null,
 sortOrder
 );
 break;
 case MOVIE:
 retCursor = db.query(
 MovieContract.MovieEntry.TABLE_NAME,
 projection,
 selection,
 selectionArgs,
 null,
 null,
 sortOrder
 );
 break;
 case MOVIE_ID:
 _id = ContentUris.parseId(uri);
 retCursor = db.query(
 MovieContract.MovieEntry.TABLE_NAME,
 projection,
 MovieContract.MovieEntry._ID + " = ?",
 new String[]{String.valueOf(_id)},
 null,
 null,
 sortOrder
 );
 break;
 default:
 throw new UnsupportedOperationException("Unknown uri: " + uri);
 }

 // Set the notification URI for the cursor to the one passed into the function. This
 // causes the cursor to register a content observer to watch for changes that happen to
 // this URI and any of it's descendants. By descendants, we mean any URI that begins
 // with this path.
 retCursor.setNotificationUri(getContext().getContentResolver(), uri);
 return retCursor;
 }

 @Override
 public Uri insert(Uri uri, ContentValues values) {
 final SQLiteDatabase db = mOpenHelper.getWritableDatabase();
 long _id;
 Uri returnUri;

 switch(sUriMatcher.match(uri)){
 case GENRE:
 _id = db.insert(MovieContract.GenreEntry.TABLE_NAME, null, values);
 if(_id &gt; 0){
 returnUri = MovieContract.GenreEntry.buildGenreUri(_id);
 } else{
 throw new UnsupportedOperationException("Unable to insert rows into: " + uri);
 }
 break;
 case MOVIE:
 _id = db.insert(MovieContract.MovieEntry.TABLE_NAME, null, values);
 if(_id &gt; 0){
 returnUri = MovieContract.MovieEntry.buildMovieUri(_id);
 } else{
 throw new UnsupportedOperationException("Unable to insert rows into: " + uri);
 }
 break;
 default:
 throw new UnsupportedOperationException("Unknown uri: " + uri);
 }

 // Use this on the URI passed into the function to notify any observers that the uri has
 // changed.
 getContext().getContentResolver().notifyChange(uri, null);
 return returnUri;
 }

 @Override
 public int delete(Uri uri, String selection, String[] selectionArgs) {
 final SQLiteDatabase db = mOpenHelper.getWritableDatabase();
 int rows; // Number of rows effected

 switch(sUriMatcher.match(uri)){
 case GENRE:
 rows = db.delete(MovieContract.GenreEntry.TABLE_NAME, selection, selectionArgs);
 break;
 case MOVIE:
 rows = db.delete(MovieContract.MovieEntry.TABLE_NAME, selection, selectionArgs);
 break;
 default:
 throw new UnsupportedOperationException("Unknown uri: " + uri);
 }

 // Because null could delete all rows:
 if(selection == null || rows != 0){
 getContext().getContentResolver().notifyChange(uri, null);
 }

 return rows;
 }

 @Override
 public int update(Uri uri, ContentValues values, String selection, String[] selectionArgs) {
 final SQLiteDatabase db = mOpenHelper.getWritableDatabase();
 int rows;

 switch(sUriMatcher.match(uri)){
 case GENRE:
 rows = db.update(MovieContract.GenreEntry.TABLE_NAME, values, selection, selectionArgs);
 break;
 case MOVIE:
 rows = db.update(MovieContract.MovieEntry.TABLE_NAME, values, selection, selectionArgs);
 break;
 default:
 throw new UnsupportedOperationException("Unknown uri: " + uri);
 }

 if(rows != 0){
 getContext().getContentResolver().notifyChange(uri, null);
 }

 return rows;
 }
}
</code></pre>

I hope it will helps you.

Demo on GitHub: <a href="https://github.com/androidessence/MovieDatabase" rel="nofollow noreferrer">https://github.com/androidessence/MovieDatabase</a>

Full Article : <a href="https://guides.codepath.com/android/creating-content-providers" rel="nofollow noreferrer">https://guides.codepath.com/android/creating-content-providers</a> 

References:

<ul>
<li><a href="http://code.tutsplus.com/tutorials/android-sdk_content-providers--mobile-5549" rel="nofollow noreferrer">http://code.tutsplus.com/tutorials/android-sdk_content-providers--mobile-5549</a></li>
<li><a href="http://www.grokkingandroid.com/android-tutorial-writing-your-own-content-provider/" rel="nofollow noreferrer">http://www.grokkingandroid.com/android-tutorial-writing-your-own-content-provider/</a></li>
<li><a href="http://developer.android.com/guide/topics/providers/content-providers.html" rel="nofollow noreferrer">http://developer.android.com/guide/topics/providers/content-providers.html</a></li>
<li><a href="https://thenewcircle.com/s/post/1375/android_content_provider_tutorial" rel="nofollow noreferrer">https://thenewcircle.com/s/post/1375/android_content_provider_tutorial</a></li>
<li><a href="http://www.grokkingandroid.com/android-tutorial-content-provider-basics/" rel="nofollow noreferrer">http://www.grokkingandroid.com/android-tutorial-content-provider-basics/</a></li>
<li><a href="http://androidessence.com/" rel="nofollow noreferrer">http://androidessence.com/</a></li>
</ul>

Note : I copied code just because if link of demo or article may be remove in future.

I'm building an app where I have a table for events and a table for venues. I want to be able to grant other applications access to this data. I have a few questions related to best practices for this kind of problem.

<ol>
<li>How should I structure the database classes?
I currently have classes for EventsDbAdapter and VenuesDbAdapter, which provide the logic for querying each table, while having a separate DbManager (extends SQLiteOpenHelper) for managing database versions, creating/upgrading databases, giving access to database (getWriteable/ReadeableDatabase). Is this the recommended solution, or would I be better off either consolidating everything to one class (ie. the DbManager) or separation everything and letting each Adapter extends SQLiteOpenHelper?</li>
<li>How should I design content providers for multiple tables?
Extending the previous question, should I use one Content Provider for the whole app, or should I create separate providers for Events and Venues?</li>
</ol>

Most examples I find only deal with single table apps, so I would appreciate any pointers here.

Best practices for exposing multiple tables using content providers in Android

数据库

GitHub

我正在构建一个应用程序，其中有一个用于活动的表和一个用于场馆的表。我希望能够授予其他应用程序访问此数据的权限。我有几个与解决此类问题的最佳实践相关的问题。How我应该构造数据库类吗？我目前有EventsDbAdapter和VenuesDbAdapter的类，它们提供了查询每个表的逻辑，同时有一个单独的DbManager...

问在Android中使用内容提供者公开多个表的最佳实践
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