Android content Provider ContentProvider Usage Example Analysis _android

This example describes the ContentProvider usage of the Android content provider. Share to everyone for your reference, specific as follows:

Personcontentprovider content provider Class

Package com.ljq.db;
Import Android.content.ContentProvider;
Import Android.content.ContentUris;
Import android.content.ContentValues;
Import Android.content.UriMatcher;
Import Android.database.Cursor;
Import Android.database.sqlite.SQLiteDatabase;
Import Android.net.Uri;
Import Android.text.TextUtils; /** * Content Provider * Role: Unified data access mode, easy external call * * @author Jiqinlin */public class Personcontentprovider extends CONTENTP The MIME type string for the Rovider {//dataset should be vnd.android.cursor.dir/with the opening public static final string persons_type = "Vnd.android.cursor.
  Dir/person "; The MIME type string for a single data should start with vnd.android.cursor.item/public static final String persons_item_type = "Vnd.android.cursor.item
  /person "; public static final String authority = "com.ljq.provider.personprovider";//Host name/* Custom MATCH code * * public static final int P
  Ersons = 1;
  /* Custom Match Code */public static final int person = 2;
  public static final Uri Persons_uri = Uri.parse ("content://" + Authority + "/person"); Private Dbopenhelper dbopenHelper = null;
  The Urimatcher class is used to match the URI and returns the matching code when matching the path using the match () method private static final Urimatcher Urimatcher;
    The static {//constant Urimatcher.no_match represents a return code that does not match any path urimatcher = new Urimatcher (urimatcher.no_match); If the match () method matches the Content://com.ljq.provider.personprovider/person path, the matching code is returned persons Urimatcher.adduri (authority, "
    Person ", PERSONS); If the match () method matches the content://com.ljq.provider.personprovider/person/230 path, the matching code is returned as the person Urimatcher.adduri (authority,
  "person/#", person);
    @Override public boolean onCreate () {dbopenhelper = new Dbopenhelper (This.getcontext ());
  return true; @Override public Uri Insert (URI uri, contentvalues values) {sqlitedatabase db = Dbopenhelper.getwritabledatabase
    ();
    Long id = 0; Switch (Urimatcher.match (URI)) {Case persons:id = db.insert (' person ', ' name ', values);//Returns the row number of the record, the primary key is int, and actually
    Is the primary key value return Contenturis.withappendedid (URI, id); Case person:id = db.insert (' person ', ' name ', values);
      String path = uri.tostring (); Return Uri.parse (path.substring (0, Path.lastindexof ("/")) +id);
    Replace the ID default:throw new IllegalArgumentException ("Unknown uri" + uri); @Override public int Delete (URI Uri, String selection, string[] selectionargs) {Sqlitedatabase db = Dbopenh
    Elper.getwritabledatabase ();
    int count = 0;
      Switch (Urimatcher.match (URI)) {Case persons:count = db.delete (' person ', selection, Selectionargs);
    Break
      Case PERSON://The following method is used to parse out the ID from the URI, CONTENT://COM.LJQ.PROVIDER.PERSONPROVIDER/PERSON/10//parsing the path, the return value is 10
      Long PersonID = Contenturis.parseid (URI); The String where = "id=" + personid;//deletes the record of the specified ID where + =! Textutils.isempty (selection)?
      "and (" + Selection + ")": "";//Append other conditions to count = Db.delete ("Person", where, Selectionargs);
    Break
    Default:throw new IllegalArgumentException ("Unknown uri" + uri);
    } db.close ();
  return count;@Override public int update (URI uri, contentvalues values, String selection, string[] selectionargs) {SQL
    Itedatabase db = Dbopenhelper.getwritabledatabase ();
    int count = 0;
      Switch (Urimatcher.match (URI)) {Case persons:count = db.update (' person ', values, selection, Selectionargs);
    Break
      Case PERSON://The following method is used to parse out the ID from the URI, CONTENT://COM.LJQ.PROVIDER.PERSONPROVIDER/PERSON/10//parsing the path, the return value is 10
      Long PersonID = Contenturis.parseid (URI); The String where = "id=" + personid;//gets the record of the specified ID where + =! Textutils.isempty (selection)?
      "and (" + Selection + ")": "";//Append other conditions to count = Db.update ("Person", values, where, Selectionargs);
    Break
    Default:throw new IllegalArgumentException ("Unknown uri" + uri);
    } db.close ();
  return count; @Override public String getType (URI uri) {switch (Urimatcher.match (URI)) {case Persons:return Perso
    Ns_type; Case Person:return Persons_item_type;
    Default:throw new IllegalArgumentException ("Unknown uri" + uri); @Override public Cursor query (URI uri, string[] projection, String selection, string[] Selectionargs, Stri
    ng SortOrder) {sqlitedatabase db = Dbopenhelper.getreadabledatabase (); Switch (Urimatcher.match (URI)) {case Persons:return db.query (' person ', projection, selection, Selectionargs, n
    Ull, NULL, sortOrder);
      Case PERSON://The following method is used to parse out the ID from the URI, CONTENT://COM.LJQ.PROVIDER.PERSONPROVIDER/PERSON/10//parsing the path, the return value is 10
      Long PersonID = Contenturis.parseid (URI); The String where = "id=" + personid;//gets the record of the specified ID where + =! Textutils.isempty (selection)? "and (" + Selection + ")": "";//Attach other conditions to return db.query ("person", projection, where, Selectionargs, NULL, NULL,
    SortOrder);
    Default:throw new IllegalArgumentException ("Unknown uri" + uri);

 }
  }
}

File list

<?xml version= "1.0" encoding= "Utf-8"?> <manifest xmlns:android= "http://schemas.android.com/apk/res/" Android "package=" Com.ljq.sql "android:versioncode=" 1 "android:versionname=" 1.0 "> <application android:icon="
    @drawable/icon "android:label=" @string/app_name "> <uses-library android:name=" Android.test.runner "/> <activity android:name= ". Sqlactivity "android:label=" @string/app_name "> <intent-filter> <action android:name=" Andro Id.intent.action.MAIN "/> <category android:name=" Android.intent.category.LAUNCHER "/> &L t;/intent-filter> </activity> <provider android:name= "Com.ljq.db.PersonContentProvider" Androi d:authorities= "Com.ljq.provider.personprovider"/> </application> <uses-sdk android:minsdkversion= "7"/ > <instrumentation android:name= "Android.test.InstrumentationTestRunner" android:targetpackage= "com.ljq.sq L "Android:lAbel= "Tests for my App"/> </manifest>

 

Personcontentprovidertest content Provider test class

Package com.ljq.test;
Import Android.content.ContentResolver;
Import android.content.ContentValues;
Import Android.database.Cursor;
Import Android.net.Uri;
Import Android.test.AndroidTestCase;
Import Android.util.Log; /** * External Access content provider * * @author Jiqinlin * */public class Personcontentprovidertest extends androidtestcase{private
  Static final String TAG = "Personcontentprovidertest";
    public void Testsave () throws throwable{contentresolver Contentresolver = This.getcontext (). Getcontentresolver ();
    Uri Inserturi = Uri.parse ("Content://com.ljq.provider.personprovider/person");
    Contentvalues values = new Contentvalues ();
    Values.put ("name", "LJQ");
    Values.put ("Phone", "1350000009");
    Uri uri = Contentresolver.insert (Inserturi, values);
  LOG.I (TAG, uri.tostring ()); The public void Testupdate () throws throwable{contentresolver Contentresolver = This.getcontext (). Getcontentresolver (
    ); Uri Updateuri = Uri.parse ("CONTENT://COM.LJQ.PROVIDER.PERSONPROVIDER/PERSON/1 ");
    Contentvalues values = new Contentvalues ();
    Values.put ("name", "Linjiqin");
  Contentresolver.update (Updateuri, values, NULL, NULL); 
    The public void Testfind () throws throwable{contentresolver Contentresolver = This.getcontext (). Getcontentresolver ();
    Uri uri = uri.parse ("Content://com.ljq.provider.personprovider/person");
    Uri uri = uri.parse ("Content://com.ljq.provider.personprovider/person");
    Cursor Cursor = contentresolver.query (URI, NULL, NULL, NULL, "ID ASC");
      while (Cursor.movetonext ()) {int PersonID = Cursor.getint (Cursor.getcolumnindex ("id"));
      String name = cursor.getstring (Cursor.getcolumnindex ("name"));
      String phone = cursor.getstring (Cursor.getcolumnindex ("Phone"));
    LOG.I (TAG, "personid=" + PersonID + ", name=" + name+ ", phone=" + phone);
  } cursor.close (); The public void Testdelete () throws throwable{contentresolver Contentresolver = This.getcontext (). Getcontentresolver (
    ); Uri uri = URi.parse ("CONTENT://COM.LJQ.PROVIDER.PERSONPROVIDER/PERSON/1");
  Contentresolver.delete (URI, NULL, NULL);

 }
}

For more information on Android-related content readers can view the site topics: "Android Debugging techniques and common problems solution summary", "Android Development introduction and Advanced Course", "Android Multimedia operating skills Summary (audio, video, recording, etc.)", " Android Basic Components Usage Summary, Android View tips Summary, Android layout layout tips and Android Control usage summary

I hope this article will help you with the Android program.