1、 SQLiteOpenHelper类的创建
数据库表的创建（onCreate）
public class DbHelper extends SQLiteOpenHelper{
private static final String name ="mydb.db";
private static final int version=1;
public DbHelper(Context context) {
super(context, name, null, version);
}
@Override
public void onCreate(SQLiteDatabase db) {
String sql="create table student (id integer primary key autoincrement,name varchar(64) ,address varchar(64))";
db.execSQL(sql);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
// TODO Auto-generated method stub
}
}
2、ContentProvider类的创建（StudentProvider）
(1)在xml文件中添加provider属性：name 、authorities
```
```
(2)定义TAG、DbHelper;定义UriMacher;定义两个标识位（STUDENT、STUDENTS）
(3)static{}静态模块：
添加匹配规则：addUri();
```
static {
//addURI(String authority, String path, int code)
//path: the path to match. * may be used as a wild card for any text,
// and # may be used as a wild card for numbers.
URI_MATCHER.addURI("com.example.sevenprovider_laoluo.StudentProvider", "student", STUDENTS);
URI_MATCHER.addURI("com.example.sevenprovider_laoluo.StudentProvider", "student", STUDENT);
}
```
3、重写getType：
public String getType(Uri uri) {
int flag = URI_MATCHER.match(uri);
switch (flag) {
case STUDENT:
return "vnd.android.cursor.item/student";
case STUDENTS:
return "vnd.android.cursor.dir/students";
}
return null;
}
4、插入数据
(1)实例化helper：
public boolean onCreate() {
helper = new DbHelper(getContext());
return false;
}
(2)利用insert插入数据
@Override
public Uri insert(Uri uri, ContentValues values) {
Uri resultUri = null;
int flag = URI_MATCHER.match(uri);
switch (flag) {
case STUDENTS:
SQLiteDatabase database = helper.getWritableDatabase();
// return：the row ID of the newly inserted row, or -1 if an error
// occurred
long id = database.insert("student", null, values);// 插入当前行的行号
// Appends the given ID to the end of the path.
resultUri = ContentUris.withAppendedId(uri, id);
break;
}
Log.i(TAG, "-------" + resultUri.toString());
return resultUri;
}
5、建立MyTest.java测试类：
public class MyTest extends AndroidTestCase{
public MyTest() {
}
public void insert(){
//内容解析者
ContentResolver contentResolver=getContext().getContentResolver();
//Creates a Uri which parses the given encoded URI string.
Uri url=Uri.parse("content://com.example.sevenprovider_laoluo.StudentProvider/student");
ContentValues values=new ContentValues();
values.put("name", "jerry");
values.put("address", "Shanghai");
contentResolver.insert(url, values);//url :The URL of the table to insert into.
}
}
附：
package com.example.sevenprovider_laoluo;
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.util.Log;
public class StudentProvider extends ContentProvider {
private final String TAG = "StudentProvider";
private DbHelper helper = null;
private static final UriMatcher URI_MATCHER = new UriMatcher(UriMatcher.NO_MATCH);
private static final int STUDENT = 1;
private static final int STUDENTS = 2;
static {
URI_MATCHER.addURI("com.example.sevenprovider_laoluo.StudentProvider", "student", STUDENTS);
URI_MATCHER.addURI("com.example.sevenprovider_laoluo.StudentProvider/#", "student", STUDENT);
}
@Override
public boolean onCreate() {
helper = new DbHelper(getContext());
return false;
}
@Override
public Cursor query(Uri uri, String[] projection, String selection, String[] selectionArgs, String sortOrder) {
// TODO Auto-generated method stub
return null;
}
@Override
public String getType(Uri uri) {
int flag = URI_MATCHER.match(uri);
switch (flag) {
case STUDENT:
return "vnd.android.cursor.item/student";
case STUDENTS:
return "vnd.android.cursor.dir/students";
}
return null;
}
@Override
public Uri insert(Uri uri, ContentValues values) {
Uri resultUri = null;
int flag = URI_MATCHER.match(uri);
switch (flag) {
case STUDENTS:
SQLiteDatabase database = helper.getWritableDatabase();
// return：the row ID of the newly inserted row, or -1 if an error
// occurred
long id = database.insert("student", null, values);// 插入当前行的行号
// Appends the given ID to the end of the path.
resultUri = ContentUris.withAppendedId(uri, id);
break;
}
Log.i(TAG, "-------" + resultUri.toString());
return resultUri;
}
@Override
public int delete(Uri uri, String selection, String[] selectionArgs) {
// TODO Auto-generated method stub
return 0;
}
@Override
public int update(Uri uri, ContentValues values, String selection, String[] selectionArgs) {
// TODO Auto-generated method stub
return 0;
}
}