public class PersonContentProvider extends ContentProvider{
public boolean onCreate()
public Uri insert(Uri uri, ContentValues values)
public int delete(Uri uri, String selection, String[] selectionArgs)
public int update(Uri uri, ContentValues values, String selection, String[] selectionArgs)
public Cursor query(Uri uri, String[] projection, String selection, String[] selectionArgs, String sortOrder)
public String getType(Uri uri)
}第二步需要在AndroidManifest.xml使用<provider>对该ContentProvider进行配置，为了能让其他应用找到该ContentProvider ，ContentProvider采用了authorities（主机名/域名）对它进行唯一标识，你可以把ContentProvider看作是一个网站（想想，网站也是提供数据者），authorities 就是他的域名：<manifest.... >
<application android:icon="@drawable/icon" android:label="@string/app_name">
<provider android:name=".PersonContentProvider"
android:authorities="com.ljq.providers.personprovider"/>
</application>
</manifest>二、Uri介绍
Uri uri = Uri.parse("content://com.ljq.provider.personprovider/person")
//常量UriMatcher.NO_MATCH表示不匹配任何路径的返回码
UriMatcher sMatcher = new UriMatcher(UriMatcher.NO_MATCH);
//如果match()方法匹配content://com.ljq.provider.personprovider/person路径，返回匹配码为1
sMatcher.addURI("com.ljq.provider.personprovider", "person", 1);//添加需要匹配uri，如果匹配就会返回匹配码
//如果match()方法匹配content://com.ljq.provider.personprovider/person/230路径，返回匹配码为2
sMatcher.addURI("com.ljq.provider.personprovider", "person/#", 2);//#号为通配符
switch (sMatcher.match(Uri.parse("content://com.ljq.provider.personprovider/person/10"))) {
case 1
break;
case 2
break;
default://不匹配
break;
}
注册完需要匹配的Uri后，就可以使用sMatcher.match(uri)方法对输入的Uri进行匹配，如果匹配就返回匹配码，匹配码是调用addURI()方法传入的第三个参数，假设匹配content://com.ljq.provider.personprovider/person路径，返回的匹配码为1 Uri uri = Uri.parse("content://com.ljq.provider.personprovider/person")
Uri resultUri = ContentUris.withAppendedId(uri, 10);
//生成后的Uri为：content://com.ljq.provider.personprovider/person/10parseId(uri)方法用于从路径中获取ID部分：Uri uri = Uri.parse("content://com.ljq.provider.personprovider/person/10")
long personid = ContentUris.parseId(uri);//获取的结果为:10ContentResolver resolver = getContentResolver();
Uri uri = Uri.parse("content://com.ljq.provider.personprovider/person");
//添加一条记录
ContentValues values = new ContentValues();
values.put("name", "linjiqin");
values.put("age", 25);
resolver.insert(uri, values);
//获取person表中所有记录
Cursor cursor = resolver.query(uri, null, null, null, "personid desc");
while(cursor.moveToNext()){
Log.i("ContentTest", "personid="+ cursor.getInt(0)+ ",name="+ cursor.getString(1));
}
//把id为1的记录的name字段值更改新为zhangsan
ContentValues updateValues = new ContentValues();
updateValues.put("name", "zhangsan");
Uri updateIdUri = ContentUris.withAppendedId(uri, 2);
resolver.update(updateIdUri, updateValues, null, null);
//删除id为2的记录
Uri deleteIdUri = ContentUris.withAppendedId(uri, 2);
resolver.delete(deleteIdUri, null, null);public class PersonContentProvider extends ContentProvider {
public Uri insert(Uri uri, ContentValues values) {
db.insert("person", "personid", values);
getContext().getContentResolver().notifyChange(uri, null);
}
}getContentResolver().registerContentObserver(Uri.parse("content://com.ljq.providers.personprovider/person"),
true, new PersonObserver(new Handler()));
public class PersonObserver extends ContentObserver{
public PersonObserver(Handler handler) {
super(handler);
}
public void onChange(boolean selfChange) {
//此处可以进行相应的业务处理
}
}原文地址：http://blog.csdn.net/itjavawfc/article/details/42120729
