http://blog.csdn.net/heqiangflytosky/article/details/317773631文详细介绍了Android ContentProvider、ContentResolver和ContentObserver的用法，现在来做1个ContentProvider完全Demo。
直接上代码：
fragment_main.xml
<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"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.johnny.testcontacts.MainActivity$PlaceholderFragment" >
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical">
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="查询所有联系人"
android:onClick="queryContact"/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="插入单个联系人"
android:onClick="insertContact"/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="插入多个联系人"
android:onClick="insertContacts"/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="删除CBA"
android:onClick="deleteContactsCBA"/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="删除NBA"
android:onClick="deleteContactsNBA"/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="删除NBA易建联"
android:onClick="deleteContactsNBAYI"/>
</LinearLayout>
</RelativeLayout>
AndroidManifest.xml
<?xml version="1.0" encoding="utf⑻"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.johnny.testcontacts"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="14" />
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="com.johnny.testcontacts.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="com.johnny.testcontacts.ContactsContentProvider"
android:authorities="com.example.johnny.contentprovider"
android:exported="false"
android:enabled="true" >
</provider>
</application>
</manifest>
ContactsBean.java
package com.johnny.testcontacts;
public class ContactsBean {
private String name;
private String telephone;
private long createDate;
private String content;
private String groupName;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getTelephone() {
return telephone;
}
public void setTelephone(String telephone) {
this.telephone = telephone;
}
public long getCreateDate() {
return createDate;
}
public void setCreateDate(long createDate) {
this.createDate = createDate;
}
public String getContent() {
return content;
}
public void setContent(String content) {
this.content = content;
}
public String getGroupName() {
return groupName;
}
public void setGroupName(String groupName) {
this.groupName = groupName;
}
}
ContactsContentProvider.java
package com.johnny.testcontacts;
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.database.sqlite.SQLiteOpenHelper;
import android.database.sqlite.SQLiteQueryBuilder;
import android.net.Uri;
import android.util.Log;
public class ContactsContentProvider extends ContentProvider {
//必须和AndroidManifest.xml中的android:authorities保持1致
public static final String AUTHORITY = "com.example.johnny.contentprovider";
public static final Uri AUTHORITY_URI = Uri.parse("content://" + AUTHORITY);
public static final String PARAM_GROUP_BY = "groupBy";
public static final String PARAM_LIMIT = "limit";
private SQLiteOpenHelper mOpenHelper;
public static interface ContactsUri{
static final String CONTACTS = "contacts";
public static final Uri URI_CONTACTS = Uri.withAppendedPath(
AUTHORITY_URI, CONTACTS);
}
static interface ContactsMatch {
public static final int CONTACTS = 0x0001;
}
static final UriMatcher URI_MATCHER = new UriMatcher(UriMatcher.NO_MATCH);
static {
final UriMatcher matcher = URI_MATCHER;
matcher.addURI(AUTHORITY, ContactsUri.CONTACTS, ContactsMatch.CONTACTS);
}
@Override
public boolean onCreate() {
mOpenHelper = DBOpenHelper.newInstance(getContext());
return true;
}
@Override
public Cursor query(Uri uri, String[] projection, String selection, String[] selectionArgs,
String sortOrder) {
SQLiteDatabase db = mOpenHelper.getReadableDatabase();
final int match = URI_MATCHER.match(uri);
SQLiteQueryBuilder qb = new SQLiteQueryBuilder();
String limit = uri.getQueryParameter(PARAM_LIMIT);
String groupBy = uri.getQueryParameter(PARAM_GROUP_BY);
switch (match) {
case ContactsMatch.CONTACTS:
qb.setTables(DBOpenHelper.ContactsTAB.TABLE_NAME);
break;
default:
throw new UnsupportedOperationException("Unknown URL "
+ uri.toString());
}
Cursor cursor = qb.query(db, projection, selection, selectionArgs,
groupBy, null, sortOrder, limit);
return cursor;
}
@Override
public String getType(Uri uri) {
return null;
}
@Override
public Uri insert(Uri uri, ContentValues contentValues) {
int match = URI_MATCHER.match(uri);
final SQLiteDatabase db = mOpenHelper.getWritableDatabase();
long id = ⑴;
switch (match) {
case ContactsMatch.CONTACTS:
id = db.insert(DBOpenHelper.ContactsTAB.TABLE_NAME, null, contentValues);
break;
default:
throw new UnsupportedOperationException("Unknown insert URI " + uri);
}
if (id >= 0) {
getContext().getContentResolver().notifyChange(uri,null);
return ContentUris.withAppendedId(uri, id);
} else {
return null;
}
}
@Override
public int delete(Uri uri, String selection, String[] selectionArgs) {
final int match = URI_MATCHER.match(uri);
final SQLiteDatabase db = mOpenHelper.getWritableDatabase();
int deleted = 0;
switch (match) {
case ContactsMatch.CONTACTS:
deleted = db.delete(DBOpenHelper.ContactsTAB.TABLE_NAME, selection, selectionArgs);
break;
default:
throw new UnsupportedOperationException("Unknown delete URI " + uri);
}
if (deleted > 0) {
getContext().getContentResolver().notifyChange(uri,null);
}
return deleted;
}
@Override
public int update(Uri uri, ContentValues contentValues, String selection, String[] selectionArgs) {
int match = URI_MATCHER.match(uri);
final SQLiteDatabase db = mOpenHelper.getWritableDatabase();
int modified = 0;
switch (match) {
case ContactsMatch.CONTACTS:
modified = db.update(DBOpenHelper.ContactsTAB.TABLE_NAME, contentValues, selection, selectionArgs);
break;
default:
throw new UnsupportedOperationException("Unknown update URI " + uri);
}
if (modified > 0) {
getContext().getContentResolver().notifyChange(uri,null);
}
return modified;
}
}
DBOpenHelper.java
package com.johnny.testcontacts;
import android.content.ContentProviderOperation;
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import android.net.Uri;
import android.util.Log;
import java.util.ArrayList;
/**
* Created by heqiang on 15⑴⑴6.
*/
public class DBOpenHelper extends SQLiteOpenHelper{
private final static String TAG = "ContactsTAB";
private static final String DB_NAME = "testcontacts.db";
private static final int DB_VERSION = 1;
public final Object CONTACTS_TABLE_LOCK = new Object();
private static Context mContext;
private static DBOpenHelper sInstance;
private DBOpenHelper(Context context){
super(context, DB_NAME, null, DB_VERSION);
}
public static synchronized DBOpenHelper newInstance(Context context) {
if (sInstance == null) {
sInstance = new DBOpenHelper(context);
mContext = context;
}
return sInstance;
}
public static synchronized DBOpenHelper getInstance() {
return sInstance;
}
public static final class ContactsTAB{
public static final String TABLE_NAME = "contacts";
public static final String _ID = "_id";
public static final String CONTACT_NAME = "name";
public static final String CONTACT_TELEPHONE = "telephone";
public static final String CONTACT_CREATE_DATE = "create_date";
public static final String CONTACT_CONTENT = "content";
public static final String CONTACT_GROUP = "group_name";
public static ContentValues parseContentValuse(ContactsBean bean){
ContentValues contentValues = new ContentValues();
contentValues.put(ContactsTAB.CONTACT_NAME,bean.getName());
contentValues.put(ContactsTAB.CONTACT_TELEPHONE,bean.getTelephone());
contentValues.put(ContactsTAB.CONTACT_CREATE_DATE,bean.getCreateDate());
contentValues.put(ContactsTAB.CONTACT_CONTENT,bean.getContent());
contentValues.put(ContactsTAB.CONTACT_GROUP,bean.getGroupName());
return contentValues;
}
}
static interface SQLS {
public static final String SQL_CREATE_CONTACTS_TABLE = "CREATE TABLE " + ContactsTAB.TABLE_NAME + " ("
+ ContactsTAB._ID + " INTEGER PRIMARY KEY AUTOINCREMENT,"
+ ContactsTAB.CONTACT_NAME + " TEXT,"
+ ContactsTAB.CONTACT_TELEPHONE + " TEXT,"
+ ContactsTAB.CONTACT_GROUP +" TEXT,"
+ ContactsTAB.CONTACT_CONTENT +" TEXT,"
+ ContactsTAB.CONTACT_CREATE_DATE + " INTEGER"
+ ");" ;
}
@Override
public void onCreate(SQLiteDatabase db) {
createTables(db);
}
@Override
public void onUpgrade(SQLiteDatabase db, int i, int i2) {
}
private void createTables(SQLiteDatabase db) {
db.execSQL(SQLS.SQL_CREATE_CONTACTS_TABLE);
}
private void doApplyOperations(Uri uri, ArrayList<ContentProviderOperation> ops) {
try {
mContext.getContentResolver().applyBatch(uri.getAuthority(), ops);
} catch (Exception e) {
Log.d(TAG, "doApplyOperations error!", e);
}
}
public void insertContact(ContactsBean bean){
ContentValues contentValues = ContactsTAB.parseContentValuse(bean);
mContext.getContentResolver().insert(ContactsContentProvider.ContactsUri.URI_CONTACTS, contentValues);
}
public void insertContacts(ArrayList<ContactsBean> beans){
Uri uri = ContactsContentProvider.ContactsUri.URI_CONTACTS;
ArrayList<ContentProviderOperation> ops = new ArrayList<ContentProviderOperation>();
for(ContactsBean bean : beans){
ContentValues contentValues = ContactsTAB.parseContentValuse(bean);
ContentProviderOperation operation = ContentProviderOperation
.newInsert(uri).withValues(contentValues).build();
ops.add(operation);
}
synchronized (CONTACTS_TABLE_LOCK) {
doApplyOperations(uri, ops);
}
}
public void deleteContactsByContent(String group){
mContext.getContentResolver().delete(ContactsContentProvider.ContactsUri.URI_CONTACTS,
ContactsTAB.CONTACT_CONTENT + "=?",
new String []{ group } );
}
public void deleteContactsByContentAndName(String group,String name){
mContext.getContentResolver().delete(ContactsContentProvider.ContactsUri.URI_CONTACTS,
ContactsTAB.CONTACT_CONTENT + "=? AND " + ContactsTAB.CONTACT_NAME + "=?",
new String []{ group, name} );
}
public ArrayList<ContactsBean> queryAllContacts(){
ArrayList<ContactsBean> beans = new ArrayList<ContactsBean>();
Cursor c = null;
c = mContext.getContentResolver().query(ContactsContentProvider.ContactsUri.URI_CONTACTS,
null,
null,
null,
null);
if (c != null && c.moveToFirst()) {
do {
ContactsBean bean = new ContactsBean();
bean.setName(c.getString(c.getColumnIndex(ContactsTAB.CONTACT_NAME)));
bean.setContent(c.getString(c.getColumnIndex(ContactsTAB.CONTACT_CONTENT)));
bean.setCreateDate(c.getLong(c.getColumnIndex(ContactsTAB.CONTACT_CREATE_DATE)));
bean.setGroupName(c.getString(c.getColumnIndex(ContactsTAB.CONTACT_GROUP)));
bean.setTelephone(c.getString(c.getColumnIndex(ContactsTAB.CONTACT_TELEPHONE)));
beans.add(bean);
}while(c.moveToNext());
c.close();
}
return beans;
}
}
MainActivity.java
package com.johnny.testcontacts;
import java.util.ArrayList;
import android.support.v7.app.ActionBarActivity;
import android.support.v7.app.ActionBar;
import android.support.v4.app.Fragment;
import android.database.ContentObserver;
import android.os.Bundle;
import android.os.Handler;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.os.Build;
public class MainActivity extends ActionBarActivity {
private DBOpenHelper mDBOpenHelper;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
if (savedInstanceState == null) {
getSupportFragmentManager().beginTransaction()
.add(R.id.container, new PlaceholderFragment()).commit();
}
}
@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);
mDBOpenHelper = DBOpenHelper.getInstance();
getContentResolver().registerContentObserver(ContactsContentProvider.ContactsUri.URI_CONTACTS, true, mContentObserver);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
/**
* A placeholder fragment containing a simple view.
*/
public static class PlaceholderFragment extends Fragment {
public PlaceholderFragment() {
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_main, container,
false);
return rootView;
}
}
public void queryContact(View view){
new Thread(new Runnable() {
@Override
public void run() {
ArrayList<ContactsBean> beans = mDBOpenHelper.queryAllContacts();
for(ContactsBean bean : beans){
Log.e("Test","----------------------");
Log.e("Test","name = "+bean.getName());
Log.e("Test","content = "+bean.getContent());
Log.e("Test","groupName = "+bean.getGroupName());
Log.e("Test","telephone = "+bean.getTelephone());
Log.e("Test","createDate = "+bean.getCreateDate());
Log.e("Test","----------------------");
}
}
}).start();
}
public void insertContact(View view){
new Thread(new Runnable() {
@Override
public void run() {
ContactsBean bean = new ContactsBean();
bean.setName("James");
bean.setGroupName("East");
bean.setTelephone("13700000000");
bean.setCreateDate(System.currentTimeMillis());
bean.setContent("NBA");
mDBOpenHelper.insertContact(bean);
}
}).start();
}
public void insertContacts(View view){
new Thread(new Runnable() {
@Override
public void run() {
ArrayList<ContactsBean> beans = new ArrayList<ContactsBean>();
ContactsBean bean = new ContactsBean();
bean.setName("Park");
bean.setGroupName("West");
bean.setTelephone("13711111111");
bean.setCreateDate(System.currentTimeMillis());
bean.setContent("NBA");
beans.add(bean);
bean = new ContactsBean();
bean.setName("YiJianLian");
bean.setGroupName("South");
bean.setTelephone("135000000");
bean.setCreateDate(System.currentTimeMillis());
bean.setContent("CBA");
beans.add(bean);
bean = new ContactsBean();
bean.setName("YiJianLian");
bean.setGroupName("East");
bean.setTelephone("13599999999");
bean.setCreateDate(System.currentTimeMillis());
bean.setContent("NBA");
beans.add(bean);
mDBOpenHelper.insertContacts(beans);
}
}).start();
}
public void deleteContactsCBA(View view){
new Thread(new Runnable() {
@Override
public void run() {
mDBOpenHelper.deleteContactsByContent("CBA");
}
}).start();
}
public void deleteContactsNBA(View view){
new Thread(new Runnable() {
@Override
public void run() {
mDBOpenHelper.deleteContactsByContent("NBA");
}
}).start();
}
public void deleteContactsNBAYI(View view){
new Thread(new Runnable() {
@Override
public void run() {
mDBOpenHelper.deleteContactsByContentAndName("NBA", "YiJianLian");
}
}).start();
}
private ContentObserver mContentObserver = new ContentObserver(new Handler()) {
@Override
public void onChange(boolean selfChange) {
super.onChange(selfChange);
new Thread(new Runnable() {
@Override
public void run() {
ArrayList<ContactsBean> beans = mDBOpenHelper.queryAllContacts();
for(ContactsBean bean : beans){
Log.e("Test","----------------------");
Log.e("Test","name = "+bean.getName());
Log.e("Test","content = "+bean.getContent());
Log.e("Test","groupName = "+bean.getGroupName());
Log.e("Test","telephone = "+bean.getTelephone());
Log.e("Test","createDate = "+bean.getCreateDate());
Log.e("Test","----------------------");
}
}
}).start();
}
};
}