Android Custom ContentProvider Instance _android

The following is Testbaidu
Mainactivity is as follows:

Copy Code code as follows:

Package Cn.testbaidu;
Import Android.net.Uri;
Import Android.os.Bundle;
Import Android.view.View;
Import Android.view.View.OnClickListener;
Import Android.widget.Button;
Import android.app.Activity;
Import Android.content.ContentResolver;
Import android.content.ContentValues;
Import Android.database.Cursor;
/**
* Demo Description:
* Apply a (Testbaidu) invoke another application (Testcontentprovider)
* Custom ContentProvider, that is:
* 1 Use of custom ContentProvider
* 2 Other applications call the ContentProvider
*
* Test Method:
* 1 to test ContentProvider in turn (note this order)
* 2 Other applications query the ContentProvider data
*
*/
public class Mainactivity extends activity {
Private Button Maddbutton;
Private Button Mdeletebutton;
Private Button Mupdatebutton;
Private Button Mquerybutton;
Private Button Mtypebutton;
Private Contentresolver Mcontentresolver;
@Override
protected void OnCreate (Bundle savedinstancestate) {
Super.oncreate (savedinstancestate);
Setcontentview (R.layout.main);
Init ();
}
private void init () {
Mcontentresolver=this.getcontentresolver ();

maddbutton= (Button) Findviewbyid (R.id.addbutton);
Maddbutton.setonclicklistener (New Clicklistenerimpl ());

mdeletebutton= (Button) Findviewbyid (R.id.deletebutton);
Mdeletebutton.setonclicklistener (New Clicklistenerimpl ());

mupdatebutton= (Button) Findviewbyid (R.id.updatebutton);
Mupdatebutton.setonclicklistener (New Clicklistenerimpl ());

mquerybutton= (Button) Findviewbyid (R.id.querybutton);
Mquerybutton.setonclicklistener (New Clicklistenerimpl ());

mtypebutton= (Button) Findviewbyid (R.id.typebutton);
Mtypebutton.setonclicklistener (New Clicklistenerimpl ());

}
Private class Clicklistenerimpl implements onclicklistener{
@Override
public void OnClick (View v) {
Switch (V.getid ()) {
Case R.id.addbutton:
Person Person=null;
for (int i = 0; i < 5; i++) {
Person=new person ("xiaoming" +i, "9527" +i, (8888+i));
Testinsert (person);
}
Break
Case R.id.deletebutton:
Testdelete (1);
Break
Case R.id.updatebutton:
Testupdate (3);
Break
Case R.id.querybutton:
Query table
Queryfromcontentprovider (-1);

Querying for personid=2 data
Testquery (2);
Break
Case R.id.typebutton:
Testtype ();
Break
Default
Break
}

}

}
private void Testinsert (person person) {
Contentvalues contentvalues=new contentvalues ();
Contentvalues.put ("Name", Person.getname ());
Contentvalues.put ("Phone", Person.getphone ());
Contentvalues.put ("Salary", person.getsalary ());
Uri inserturi=uri.parse ("Content://cn.bs.testcontentprovider/person");
Uri Returnuri=mcontentresolver.insert (Inserturi, contentvalues);
SYSTEM.OUT.PRINTLN ("Add Data: returnuri=" +returnuri);
}

private void Testdelete (int index) {
Uri uri=uri.parse ("content://cn.bs.testcontentprovider/person/" +string.valueof (index));
Mcontentresolver.delete (URI, NULL, NULL);
}

private void testupdate (int index) {
Uri uri=uri.parse ("content://cn.bs.testcontentprovider/person/" +string.valueof (index));
Contentvalues values=new contentvalues ();
Values.put ("name", "Hanmeimei");
Values.put ("Phone", "1234");
Values.put ("Salary", 333);
Mcontentresolver.update (URI, values, NULL, NULL);
}
private void Testquery (int index) {
Uri Uri=null;
if (index<=0) {
Query table
Uri=uri.parse ("Content://cn.bs.testcontentprovider/person");
} else {
Query for a piece of data by ID
Uri=uri.parse ("content://cn.bs.testcontentprovider/person/" +string.valueof (index));
}

Corresponding to the above: query table
Cursor cursor= mcontentresolver.query (URI, NULL, NULL, NULL, NULL);

Corresponding to the above: query personid=2 data
Note: Because name is a varchar field, you should write "Name= ' Xiaoming1"
If you write a "name=xiaoming1" query, you will get an error
Cursor cursor= mcontentresolver.query (URI, NULL, "Name= ' xiaoming1 '", NULL, NULL);

while (Cursor.movetonext ()) {
int Personid=cursor.getint (Cursor.getcolumnindex ("PersonID"));
String name=cursor.getstring (Cursor.getcolumnindex ("name"));
String phone=cursor.getstring (Cursor.getcolumnindex ("Phone"));
int Salary=cursor.getint (Cursor.getcolumnindex ("salary"));
SYSTEM.OUT.PRINTLN ("Query obtained: personid=" + personid+ ", name=" +name+ ", phone=" +phone+ ", salary=" +salary ");
}
Cursor.close ();
}

private void Testtype () {
Uri diruri=uri.parse ("Content://cn.bs.testcontentprovider/person");
String Dirtype=mcontentresolver.gettype (Diruri);
System.out.println ("Dirtype:" +dirtype);

Uri itemuri=uri.parse ("CONTENT://CN.BS.TESTCONTENTPROVIDER/PERSON/3");
String Itemtype=mcontentresolver.gettype (Itemuri);
System.out.println ("ItemType:" +itemtype);
}
}

The person is as follows:

Copy Code code as follows:

Package Cn.testbaidu;
public class Person {
Private Integer ID;
private String name;
Private String phone;
Private Integer salary;
Public person (string name, string Phone,integer salary) {
THIS.name = name;
This.phone = phone;
This.salary=salary;
}
Public person (Integer ID, string name, String Phone,integer salary) {
This.id = ID;
THIS.name = name;
This.phone = phone;
This.salary=salary;
}
Public Integer getId () {
return ID;
}
public void SetId (Integer id) {
This.id = ID;
}
Public String GetName () {
return name;
}
public void SetName (String name) {
THIS.name = name;
}
Public String Getphone () {
return phone;
}
public void Setphone (String phone) {
This.phone = phone;
}
Public Integer getsalary () {
return salary;
}
public void Setsalary (Integer salary) {
This.salary = salary;
}
@Override
Public String toString () {
return "person [id=" + ID + ", name=" + name + ", phone=" + phone+ ", salary=" + salary + "]";
}



}

Main.xml is as follows:

Copy Code code as follows:

<relativelayout 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" >
<button
Android:id= "@+id/addbutton"
Android:layout_width= "Wrap_content"
android:layout_height= "Wrap_content"
Android:layout_centerhorizontal= "true"
android:layout_margintop= "30dip"
android:text= "Increase"
Android:textsize= "20sp"/>
<button
Android:id= "@+id/deletebutton"
Android:layout_width= "Wrap_content"
android:layout_height= "Wrap_content"
Android:layout_centerhorizontal= "true"
android:layout_margintop= "30dip"
android:layout_below= "@id/addbutton"
android:text= "Delete"
Android:textsize= "20sp"/>
<button
Android:id= "@+id/updatebutton"
Android:layout_width= "Wrap_content"
android:layout_height= "Wrap_content"
Android:layout_centerhorizontal= "true"
android:layout_margintop= "30dip"
android:layout_below= "@id/deletebutton"
android:text= "Modify"
Android:textsize= "20sp"/>
<button
Android:id= "@+id/querybutton"
Android:layout_width= "Wrap_content"
android:layout_height= "Wrap_content"
Android:layout_centerhorizontal= "true"
android:layout_margintop= "30dip"
android:layout_below= "@id/updatebutton"
android:text= "Query"
Android:textsize= "20sp"/>
<button
Android:id= "@+id/typebutton"
Android:layout_width= "Wrap_content"
android:layout_height= "Wrap_content"
Android:layout_centerhorizontal= "true"
android:layout_margintop= "30dip"
android:layout_below= "@id/querybutton"
android:text= "Type"
Android:textsize= "20sp"/>
</RelativeLayout>

The following is Testcontentprovider
Mainactivity is as follows:

Copy Code code as follows:

Package cn.testcontentprovider;
Import android.app.Activity;
Import Android.os.Bundle;
public class Mainactivity extends activity {
@Override
protected void OnCreate (Bundle savedinstancestate) {
Super.oncreate (savedinstancestate);
Setcontentview (R.layout.main);
}
}

Contentprovidertest is as follows:

Copy Code code as follows:

Package cn.testcontentprovider;
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;
/**
* Precautions:
* Properties when registering ContentProvider in Androidmanifest.xml
* android:exported= "True" indicates that other application access is allowed.
* So testbaidu this application can access the ContentProvider of the place
*/
public class Contentprovidertest extends ContentProvider {
Private Dbopenhelper Dbopenhelper;
Private Urimatcher Uri_matcher;
private static final int PERSONS = 0;
private static final int person = 1;

@Override
public Boolean onCreate () {
Initurimatcher ();
Dbopenhelper=new Dbopenhelper (GetContext ());
return true;
}
Initialize Urimatcher
private void Initurimatcher () {
Uri_matcher=new Urimatcher (Urimatcher.no_match);
Represents the return of all the person, where persons is the identity code for that particular URI
Uri_matcher.adduri ("Cn.bs.testcontentprovider", "person", PERSONS);
Represents the return of a person who is the identity code for that particular URI
Uri_matcher.adduri ("Cn.bs.testcontentprovider", "person/#", person);
}
/**
* Insert operation:
* Insert operation only one possibility: INSERT into a table
* Returns the URI corresponding to the new record
* Method Db.insert () returns the primary key value of the result for the new record
*/
@Override
Public URI insert (URI uri, contentvalues values) {
Sqlitedatabase db=dbopenhelper.getwritabledatabase ();
Switch (Uri_matcher.match (URI)) {
Case PERSONS:
Long Rowid=db.insert ("person", "name,phone,salary", values);
Return Contenturis.withappendedid (URI, ROWID);
Default
throw new IllegalArgumentException ("Unknown URI" +uri.tostring ());
}
}

/**
* Update operation:
* There are two possibilities for update operations: updating a table or updating a piece of data
* The principle of updating a piece of data is similar to querying a certain data, see below.
*/
@Override
public int update (URI uri, contentvalues values, String selection, string[] Selectionargs) {
Sqlitedatabase db=dbopenhelper.getwritabledatabase ();
int updatanum=0;
Switch (Uri_matcher.match (URI)) {
Update table
Case PERSONS:
Updatanum=db.update ("person", values, selection, Selectionargs);
Break
Update a piece of data by ID
Case Person:
Long Id=contenturis.parseid (URI);
String where= "personid=" +ID;
if (selection!=null&&! "". Equals (Selection.trim ())) {
where=selection+ "and" +where;
}
Updatanum=db.update ("person", values, where, Selectionargs);
Break
Default
throw new IllegalArgumentException ("Unknown URI" +uri.tostring ());
}
return updatanum;
}

/**
* Delete operation:
* There are two possible deletions: deleting a table or deleting a piece of data
* The principle of deleting a piece of data is similar to querying a certain data, see below.
*/
@Override
public int Delete (URI Uri, String selection, string[] Selectionargs) {
Sqlitedatabase db=dbopenhelper.getwritabledatabase ();
int deletednum=0;
Switch (Uri_matcher.match (URI)) {
Delete Table
Case PERSONS:
Deletednum=db.delete ("Person", selection, Selectionargs);
Break
Delete a piece of data by ID
Case Person:
Long Id=contenturis.parseid (URI);
String where= "personid=" +ID;
if (selection!=null&&! "". Equals (Selection.trim ())) {
where=selection+ "and" +where;
}
Deletednum=db.delete ("Person", where, Selectionargs);
Break
Default
throw new IllegalArgumentException ("Unknown URI" +uri.tostring ());
}
return deletednum;
}
/**
* Query operation:
* There are two possibilities for query operations: Querying a table or querying a particular piece of data
* Precautions:
* Be careful when querying for a particular data--because this is the PersonID to query
* A piece of data, but there may be other restrictions. For example:
* Requires PersonID to be 2 and name is Xiaoming1
* So the query is divided into two steps:
* First step:
* Parse out PersonID put in where query condition
* Part II:
* To determine if there are other restrictions (such as name), and if so, to
* Group spelling to where query conditions.
* Detailed code see below.
*/
@Override
Public Cursor query (URI uri, string[] projection, string selection, string[] Selectionargs, string sortOrder) {
Sqlitedatabase db=dbopenhelper.getwritabledatabase ();
Cursor Cursor;
Switch (Uri_matcher.match (URI)) {
Query table
Case PERSONS:
Cursor=db.query ("person", projection, selection, Selectionargs, NULL, NULL, sortOrder);
Break
Query for a piece of data by ID
Case Person:
First step:
Long Id=contenturis.parseid (URI);
String where= "personid=" +ID;
Step Two:
if (selection!=null&&! "". Equals (Selection.trim ())) {
where=selection+ "and" +where;
}
Cursor=db.query ("person", projection, where, Selectionargs, NULL, NULL, sortOrder);
Break
Default
throw new IllegalArgumentException ("Unknown URI" +uri.tostring ());
}
return cursor;
}

/**
* Returns the MIME type of the data represented by the current URI.
* If the URI corresponding to the data may contain more than one record, then return
* The string should start with "vnd.android.cursor.dir/"
* If the URI corresponds to the data that contains only one record, then return
* The string should start with "vnd.android.cursor.item/"
*/
@Override
Public String GetType (Uri uri) {
Switch (Uri_matcher.match (URI)) {
Case PERSONS:
return "Vnd.android.cursor.dir/persons";
Case Person:
return "Vnd.android.cursor.item/person";
Default
throw new IllegalArgumentException ("Unknown URI" +uri.tostring ());
}
}
}

Dbopenhelper is as follows:

Copy Code code as follows:

Package cn.testcontentprovider;
Import Android.content.Context;
Import Android.database.sqlite.SQLiteDatabase;
Import Android.database.sqlite.SQLiteOpenHelper;
public class Dbopenhelper extends Sqliteopenhelper {
Public Dbopenhelper {
Super (context, "contentprovidertest.db", NULL, 1);
}
@Override
public void OnCreate (Sqlitedatabase db) {
Db.execsql ("CREATE TABLE Person" (PersonID integer PRIMARY key autoincrement,name varchar (), phone varchar (), salary Integer (12)) ");
}
Call this method when the database version number is changed
@Override
public void Onupgrade (sqlitedatabase db, int arg1, int arg2) {
Db.execsql ("ALTER TABLE person ADD phone varchar () NULL");
Db.execsql ("ALTER TABLE person ADD salary Integer NULL");
}
}

Androidmanifest.xml is as follows:

Copy Code code as follows:

<?xml version= "1.0" encoding= "Utf-8"?>
<manifest xmlns:android= "Http://schemas.android.com/apk/res/android"
Package= "Cn.testcontentprovider"
Android:versioncode= "1"
Android:versionname= "1.0" >
<uses-sdk
Android:minsdkversion= "8"
android:targetsdkversion= "8"/>
<uses-permission android:name= "Android.permission.INTERNET"/>
<uses-permission android:name= "Android.permission.ACCESS_NETWORK_STATE"/>
<uses-permission android:name= "Android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name= "Android.permission.MOUNT_UNMOUNT_FILESYSTEMS"/>
<application
Android:allowbackup= "true"
android:icon= "@drawable/ic_launcher"
Android:label= "@string/app_name"
Android:theme= "@style/apptheme" >
<activity
Android:name= "Cn.testcontentprovider.MainActivity"
Android:label= "@string/app_name" >
<intent-filter>
<action android:name= "Android.intent.action.MAIN"/>
<category android:name= "Android.intent.category.LAUNCHER"/>
</intent-filter>
</activity>
<provider
Android:name= "Cn.testcontentprovider.ContentProviderTest"
Android:authorities= "Cn.bs.testcontentprovider"
Android:exported= "true"
/>
</application>
</manifest>