An example of using ContentProvider management system resources in Android _android

ContentProvider An instance of managing a contact:

Package com.android.xiong.getsystemcontentprovidertest; 
 
Import java.util.ArrayList; 
Import android.app.Activity; 
Import Android.app.AlertDialog; 
Import Android.content.ContentUris; 
Import android.content.ContentValues; 
Import Android.database.Cursor; 
Import Android.net.Uri; 
Import Android.os.Bundle; 
Import Android.provider.ContactsContract; 
Import Android.provider.ContactsContract.CommonDataKinds.Email; 
Import Android.provider.ContactsContract.CommonDataKinds.Phone; 
Import Android.provider.ContactsContract.CommonDataKinds.StructuredName; 
Import Android.provider.ContactsContract.Data; 
Import android.provider.ContactsContract.RawContacts; 
Import android.view.Gravity; 
Import Android.view.Menu; 
Import Android.view.View; 
Import Android.view.View.OnClickListener; 
Import Android.view.ViewGroup; 
Import Android.widget.AbsListView; 
Import Android.widget.AbsListView.LayoutParams; 
Import Android.widget.BaseExpandableListAdapter; 
Import Android.widget.Button; Import andRoid.widget.EditText; 
Import Android.widget.ExpandableListAdapter; 
Import Android.widget.ExpandableListView; 
Import Android.widget.TextView; 
 
Import Android.widget.Toast; 
  public class Mainactivity extends activity {private Button bt1, BT2; 
 
  Private Expandablelistview EXP1; 
    @Override protected void OnCreate (Bundle savedinstancestate) {super.oncreate (savedinstancestate); 
    Setcontentview (R.layout.activity_main); 
    BT1 = (Button) Findviewbyid (R.ID.BT1); 
    Bt1.setonclicklistener (New Lookpresonclick ()); 
    BT2 = (Button) Findviewbyid (R.ID.BT2); 
 
  Bt2.setonclicklistener (New Addpersonclick ()); Class Addpersonclick implements Onclicklistener {@Override public void OnClick (View v) {//Get process 
      The Mulberry text box in the order interface String name = ((edittext) Findviewbyid (r.id.ed1)). GetText (). toString (); 
      String phone = ((edittext) Findviewbyid (R.ID.ED2)). GetText (). toString (); String email = ((edittext) FindviewbyId (R.ID.ED3)). GetText (). toString (); 
      Create an empty contentvalue contentvalues values = new Contentvalues (); Executes a null value insert///purpose to Rawcontacts.contnt_uri the Rawcontactid Uri Rawcontactsuri = Getcontentresolver () returned by the system. Inser 
      T (Rawcontacts.content_uri, values); 
      Long Rawcontactid = Contenturis.parseid (Rawcontactsuri); 
      Values.clear (); 
      Values.put (data.raw_contact_id, Rawcontactid); 
      Sets the content type Values.put (Data.mimetype, Structuredname.content_item_type); 
      Set the contact name Values.put (structuredname.given_name, name); Add a contact name to the contact URI getcontentresolver (). Insert (Android.provider.ContactsContract.Data.CONTENT_URI, value 
      s); 
      Values.clear (); 
      Values.put (data.raw_contact_id, Rawcontactid); 
      Values.put (Data.mimetype, Phone.content_item_type); 
      Set up a contact's phone values.put (phone.number, phone); 
   Set Phone type values.put (Phone.type, phone.type_mobile);   Add a phone number to the contact phone URI getcontentresolver (). Insert (Android.provider.ContactsContract.Data.CONTENT_URI, V 
      Alues); 
      Values.clear (); 
      Values.put (data.raw_contact_id, Rawcontactid); 
      Values.put (Data.mimetype, Email.content_item_type); 
      Set up a contact's email address values.put (email.data, email); 
      Set the type of Email values.put (Email.type, email.type_work); 
      Getcontentresolver (). Insert (Android.provider.ContactsContract.Data.CONTENT_URI, values); 
 
    Toast.maketext (Mainactivity.this, "Add contact information successful", Toast.length_long). Show (); 
      Class Lookpresonclick implements Onclicklistener {@Override public void OnClick (View v) { 
      Define two list to encapsulate system contact information, specify contact person's phone number, email details final arraylist<string> names = new arraylist<string> (); 
      Final arraylist<arraylist<string>> details = new arraylist<arraylist<string>> (); Use Contentresolver to find contact data CUrsor cursor = getcontentresolver (). query (ContactsContract.Contacts.CONTENT_URI, NULL, NULL, NULL, 
      NULL); Traversal results get all contact information for the system while (Cursor.movetonext ()) {//Get contact ID String ContactID = cursor.getstring ( 
        Cursor. Getcolumnindex (contactscontract.contacts._id)); Gets the name of the contact String name = cursor. getString (cursor. Getcolumnindex contactscontract . 
        Contacts.display_name)); 
        Names.add (name); Use Contentresolver to find the contact's phone number Cursor phones = getcontentresolver (). Query (Contactscontract.commonda 
                TaKinds.Phone.CONTENT_URI, NULL, ContactsContract.CommonDataKinds.Phone.CONTACT_ID 
        + "=?", new string[] {ContactID}, NULL); 
        arraylist<string> detail = new arraylist<string> (); Iterate through the query results, get the contact's multiple phone while (Phones.movetonext ()) {//Get the Phone number column String in the query's results PhoneNumber = phones. GetString (phones. Getcolumnindex (Contactscontract.commondatakinds . 
          Phone.number)); 
        Detail.add ("Telephone number is:" + phonenumber); 
        } phones.close (); Use Contentresolver to find the e-mail address of a contact Cursor emails = getcontentresolver (). Query (Contactscontract.comm 
                OnDataKinds.Email.CONTENT_URI, NULL, ContactsContract.CommonDataKinds.Email.CONTACT_ID 
        + "=?", new string[] {ContactID}, NULL); Traverse query results, get multiple email addresses for this contact while (Emails.movetonext ()) {//Get the results of the query the data String EMA in the email address iladdress = emails. getString (emails. Getcolumnindex (ContactsContract.CommonDataKinds.Em Ail. 
          DATA)); 
        Detail.add ("Email is:" + emailaddress); 
        } emails.close (); 
 
      Details.add (detail); 
 
      } cursor.close (); Load Result.xml Interface Layout representative View Resultdialog= Getlayoutinflater (). Inflate (R.layout.result, NULL); 
      EXP1 = (Expandablelistview) Resultdialog.findviewbyid (R.ID.EXP1); Create a Expandablelistadapter object Expandablelistadapter adapter = new Baseexpandablelistadapter () {@Overri De public boolean ischildselectable (int groupposition, int childposition) {//TODO auto- 
        Generated method stub return true; @Override public boolean hasstableids () {//TODO auto-generated method stub R 
        Eturn true; @Override public view Getgroupview (int groupposition, Boolean isexpanded, view Convertv 
          Iew, ViewGroup parent) {TextView text = Gettextveiw (); 
          Text.settext (Getgroup (groupposition). toString ()); 
        return text; 
       @Override public long getgroupid (int groupposition) {//TODO auto-generated method stub   return groupposition; @Override public int GetGroupCount () {//TODO auto-generated method stub Retu 
        RN Names.size (); 
          @Override public Object getgroup (int groupposition) {//TODO auto-generated method stub 
        Return Names.get (groupposition); @Override public int Getchildrencount (int groupposition) {//TODO auto-generated method 
        Stub return Details.get (Groupposition). Size (); Private TextView Gettextveiw () {abslistview.layoutparams LP = new Layoutparams (Vi 
          EwGroup.LayoutParams.MATCH_PARENT, 64); 
          TextView TextView = new TextView (mainactivity.this); 
          TEXTVIEW.SETLAYOUTPARAMS (LP); Textview.setgravity (gravity.center_vertical | 
          Gravity.left); 
          Textview.setpadding (36, 0, 0, 0); 
          Textview.settextsize (20); 
    return TextView;    @Override public View getchildview (int groupposition, int childposition, Boolean is 
          LastChild, View Convertview, ViewGroup parent) {TextView TextView = Gettextveiw (); 
 
          Textview.settext (Getchild (Groupposition, childposition). toString ()); 
        return TextView; @Override public long Getchildid (int groupposition, int childposition) {//TODO Auto-gen 
        erated method stub return childposition; @Override public Object getchild (int groupposition, int childposition) {return DETAILS.G 
        ET (groupposition). get (Childposition); 
      } 
      }; 
      Exp1.setadapter (adapter); Use the dialog box to display query results new Alertdialog.builder (mainactivity.this). Setview (Resultdialog). Setpositivebutton (ok 
    , null). Show (); } @Override Public boolean Oncreateoptionsmenu (Menu menu) {//Inflate the menu;This adds items to the action bar if it is present. 
    Getmenuinflater (). Inflate (R.menu.main, menu); 
  return true; 
 } 
 
}

<linearlayout xmlns:android= "http://schemas.android.com/apk/res/android" xmlns:tools= "http:// Schemas.android.com/tools "android:layout_width=" match_parent "android:layout_height=" Match_parent "Android:orien" tation= "Vertical" tools:context= ". Mainactivity "> <edittext android:id=" @+id/ed1 "android:layout_width=" Match_parent "Android:l" ayout_height= "Wrap_content" android:hint= "Enter contact name"/> <edittext android:id= "@+id/ed2" Androi D:layout_width= "Match_parent" android:layout_height= "wrap_content" android:hint= "Enter contact phone"/> <Edit 
      Text android:id= "@+id/ed3" android:layout_width= "match_parent" android:layout_height= "Wrap_content" android:hint= "Enter contact person email"/> <button android:id= @+id/bt2 "android:layout_width=" Match_par Ent "android:layout_height=" wrap_content "android:text=" Add contact information "/> <button android:id=" @+id/bt 1 "ANdroid:layout_width= "Match_parent" android:layout_height= "wrap_content" android:text= "View Contacts"/> </Lin 

 Earlayout>

<?xml version= "1.0" encoding= "Utf-8"?> <linearlayout xmlns:android= 
"http://schemas.android.com/apk/" Res/android " 
  android:layout_width=" match_parent " 
  android:layout_height=" match_parent " 
  android:o" rientation= "vertical" > 
   
 
  <expandablelistview 
    android:id= "@+id/exp1" 
    Match_parent " 
    android:layout_height=" wrap_content "> 
  </ExpandableListView> 
</ Linearlayout> 

Managing multimedia content using ContentProvider
Android provides a URI for multimedia:
1. MediaStore.Audio.Mdia.EXTERNAL_CONTENT_URI: Audio files stored on external devices
2, MediaStore.Audio.Mdia.INTERNAL_CONTENT_URI: stored in the phone's internal audio files
3, MediaStore.Images.Mdia.EXTERNAL_CONTENT_URI: The image file stored on the external device
4. MediaStore.Images.Mdia.INTERNAL_CONTENT_URI: Picture files stored on internal devices
5. MediaStore.Video.Mdia.EXTERNAL_CONTENT_URI: Audio files stored on external devices
6. MediaStore.Video.Mdia.INTERNAL_CONTENT_URI: Audio files stored on internal devices
Instance:

Package com.example.mediaprovidertest; 
Import java.io.IOException; 
Import Java.io.OutputStream; 
Import java.util.ArrayList; 
Import Java.util.HashMap; 
Import java.util.List; 
 
Import Java.util.Map; 
Import android.app.Activity; 
Import Android.app.AlertDialog; 
Import android.content.ContentValues; 
Import Android.database.Cursor; 
Import Android.graphics.Bitmap; 
Import Android.graphics.BitmapFactory; 
Import Android.net.Uri; 
Import Android.os.Bundle; 
Import Android.provider.MediaStore.Images.Media; 
Import Android.view.Menu; 
Import Android.view.View; 
Import Android.view.View.OnClickListener; 
Import Android.widget.AdapterView; 
Import Android.widget.AdapterView.OnItemClickListener; 
Import Android.widget.Button; 
Import Android.widget.ImageView; 
Import Android.widget.ListView; 
Import Android.widget.SimpleAdapter; 
 
Import Android.widget.TextView; 
  public class Mainactivity extends activity {private Button bt1, BT2; 
 
  Private ListView List1; Arraylist<string> names = new arraylist<string> (); 
  arraylist<string> Descs = new arraylist<string> (); 
 
  arraylist<string> filenames = new arraylist<string> (); 
    @Override protected void OnCreate (Bundle savedinstancestate) {super.oncreate (savedinstancestate); 
    Setcontentview (R.layout.activity_main); 
    BT1 = (Button) Findviewbyid (R.ID.BT1); 
    BT2 = (Button) Findviewbyid (R.ID.BT2); 
 
    List1 = (ListView) Findviewbyid (r.id.list); Bt1.setonclicklistener (New Onclicklistener () {@Override public void OnClick (View v) {//empty names 
        , the original data names.clear () in the DESC and filename collection; 
        Descs.clear (); 
        Filenames.clear (); Query all picture information through contentresolver Cursor Curos = Getcontentresolver (). Query (Media.external_content_uri, 
        NULL, NULL, NULL, NULL); while (Curos.movetonext ()) {//Get the name of the picture displayed String name = Curos.getstring (Curos. Getcol Umnindex(Media.display_name)); 
          Gets the details of the picture, String desc = curos.getstring (curos. Getcolumnindex (media.description)); 
          Place the name of the picture saved byte[] data = Curos.getblob (Curos. Getcolumnindex (Media.data)); 
          Add the picture name to the Names collection Names.add (name); 
          Adds a picture description to the Desc collection descs.add (DESC); 
        Add the picture save path to the Filenames collection Filenames.add (new String (data, 0, data.length-1));  The element that creates a List collection is the Map list<map<string, object>> listitems = new arraylist<map<string, 
        Object>> ();  Converts data from names, Descs two collection objects to the Map collection for (int i = 0; i < names.size (); i++) {map<string, object> 
          ListItem = new hashmap<string, object> (); 
          Listitem.put ("Name", Names.get (i)); 
          Listitem.put ("desc", Descs.get (i)); 
        Listitems.add (ListItem); } simpleadapter simple = new Simpleadapter(Mainactivity.this, ListItems, R.layout.items, new string[] {"name", "Desc"}, new int[] { 
        R.id.txt1, r.id.txt2}); 
 
      List1.setadapter (simple); 
    } 
    }); List1.setonitemclicklistener (New Onitemclicklistener () {@Override public void Onitemclick (adapterview< ?> arg0, view arg1, int arg2, long arg3) {//Load View.xml Interface Layout representative view views = GETLAYOUTINFL 
        Ater (). Inflate (R.layout.view, NULL); 
        Gets the ImageView component ImageView Image1 = (imageview) View.findviewbyid (r.id.image1) in Viewdialog; 
        Set image to display the specified picture Image1.setimagebitmap (bitmapfactory.decodefile (filenames. Get (ARG2))); Use the dialog box to display the picture new Alertdialog.builder (mainactivity.this). Setview (view) that the user clicked. Setpositivebutton ("OK", 
 
      NULL). Show (); 
    } 
    }); Bt2.setonclicklistener (New Onclicklistener () {@Override public void OnClick (View v) {//Create Contentvalues object, ready to insert data contentvalues values = new Contentvalues (); 
        Values.put (Media.display_name, "Jinta"); 
        Values.put (media.description, "urn"); 
        Values.put (Media.mime_type, "image/jpeg"); 
        The URI Uri URI of the inserted data = Getcontentresolver (). Insert (Media.external_content_uri, values); Load the Jinta picture under the application Bitmap Bitmap = Bitmapfactory.decoderesource (MainActivity.this.getResources (), R 
        . Drawable.jinta); 
        OutputStream OS = null; 
          try {//get the output stream OS = Getcontentresolver (). Openoutputstream (URI) for the URI of the data just inserted; 
          Save the bitmap picture to the corresponding data node in the URI bitmap.compress (Bitmap.CompressFormat.JPEG, OS); 
        Os.close (); 
        catch (IOException io) {io.printstacktrace (); 
  } 
      } 
    }); @Override public boolean Oncreateoptionsmenu (Menu menu) {//Inflate the menu, this adds items to the Actio N Bar if itis present. 
    Getmenuinflater (). Inflate (R.menu.main, menu); 
  return true; 
 } 
 
}

<linearlayout xmlns:android= "http://schemas.android.com/apk/res/android" 
  xmlns:tools= "http:// Schemas.android.com/tools " 
  android:layout_width=" match_parent " 
  android:layout_height=" Match_parent " 
  android:orientation= "vertical" 
  tools:context= ". Mainactivity "> 
   
  <button  
    android:id=" @+id/bt1 " 
    android:layout_width=" Match_parent " 
    Android : layout_height= "wrap_content" 
    android:text= "view picture"/> 
  <button android:id=  
    "@+id/bt2" 
    Android:layout_width= "Match_parent" 
    android:layout_height= "wrap_content" 
    android:text= "add Picture"/> 
  <listview  
    android:id= "@+id/list" 
    android:layout_width= "match_parent" 
    android:layout_ height= "Wrap_content" ></ListView> 
 
 
 
</LinearLayout> 

 <?xml version= "1.0" encoding= "Utf-8"?> <linearlayout "xmlns:android=" Schemas.android.com/apk/res/android "android:layout_width=" match_parent "android:layout_height=" Match_parent "and 
    roid:orientation= "vertical" > <textview android:id= "@+id/txt1" android:layout_width= "Match_parent" android:layout_height= "Wrap_content"/> <textview android:id= "@+id/txt2" android:layout_width= Parent "android:layout_height=" wrap_content "/> </LinearLayout> 

<?xml version= "1.0" encoding= "Utf-8"?> <linearlayout xmlns:android= 
"http://schemas.android.com/apk/" Res/android " 
  android:layout_width=" match_parent " 
  android:layout_height=" match_parent " 
  android:o" rientation= "vertical" > 
 
    <imageview 
      android:id= "@+id/image1" android:layout_width= "Match_" 
      Parent " 
      android:layout_height=" match_parent "/> 
 
</LinearLayout>