package com.example.tigongzhe;
import android.R.integer;
import android.content.
ContentProvider;
import android.content.Content
Uris;
import android.content.ContentValues;
import android.content.Context;
import android.content.
UriMatcher;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteDatabase.CursorFactory;
import android.database.sqlite.SQLiteOpenHelper;
import android.net.
Uri;
import android.provider.SyncStateContract.Helpers;
import android.text.Selection;
import android.util.Log;
public class provider extends
ContentProvider {
private MyOpenHelper myOpenHelper;
private SQLiteDatabase sqLiteDatabase;
private static final
UriMatcher
URI_MATCHER=new
UriMatcher(
UriMatcher.NO_MATCH);
private final String TAG="provider";
private static final String authority="com.example.tigongzhe.provider";
static {
URI_MATCHER.add
URI(authority, "contacter", 1);
URI_MATCHER.add
URI(authority, "contacter/#", 2);
}
private static final String _id="id";
private static final String name="name";
private static final String num="num";
@Override
public boolean onCreate() {
// TODO Auto-generated method stub
myOpenHelper=new MyOpenHelper(getContext(), DB_Name, null, version_1);
return true;
}
@Override
public String getType(
Uri uri) {
// TODO Auto-generated method stub
int flag=
URI_MATCHER.match(
uri);
switch (flag) {
case 2:
return "vnd.android.cursor.item/contacter";
case 1:
return "vnd.android.dir.item/contacter";
default:
throw new IllegalArgumentException("异常参数");
}
}
@Override
public
Uri insert(
Uri uri, ContentValues values) {
// TODO Auto-generated method stub
sqLiteDatabase=myOpenHelper.getWritableDatabase();
int flag=
URI_MATCHER.match(
uri);
switch (flag) {
case 1:
sqLiteDatabase.insert(Table_Name, name, values);
break;
case 2:
long id=sqLiteDatabase.insert(Table_Name, name, values);
Content
Uris.withAppendedId(
uri, id);
default:
break;
}
return
uri;
}
@Override
public Cursor query(
Uri uri, String[] arg1, String arg2, String[] arg3,
String arg4) {
// TODO Auto-generated method stub
Cursor cursor;
sqLiteDatabase=myOpenHelper.getReadableDatabase();
int flag=
URI_MATCHER.match(
uri);
switch (flag) {
case 1:
cursor=sqLiteDatabase.query(Table_Name, arg1, arg2, arg3, null, null,arg4);
break;
case 2:
long id=Content
Uris.parseId(
uri);
arg2=(arg2==null||"".equals(arg2.trim()))? _id+"="+id:arg2+"and"+_id+"="+id;
cursor=sqLiteDatabase.query(Table_Name, arg1, arg2, arg3, null, null,arg4);
default:
throw new IllegalArgumentException("参数错误");
}
return cursor;
}
@Override
public int update(
Uri uri, ContentValues values, String selection,
String[] selectionArgs) {
// TODO Auto-generated method stub
int num=0;
sqLiteDatabase=myOpenHelper.getWritableDatabase();
int flag=
URI_MATCHER.match(
uri);
switch (flag) {
case 1:
num=sqLiteDatabase.update(Table_Name, values,selection, selectionArgs);
break;
case 2:
long id=Content
Uris.parseId(
uri);
selection=(selection==null||"".equals(selection.trim()))?
_id+"="+id:selection+"and"+_id+"="+id;
num=sqLiteDatabase.update(Table_Name, values,selection, selectionArgs);
default:
break;
}
return num;
}
@Override
public int delete(
Uri uri, String selection, String[] selectionArgs) {
// TODO Auto-generated method stub
int num=0;
sqLiteDatabase=myOpenHelper.getWritableDatabase();
int flag=
URI_MATCHER.match(
uri);
switch (flag) {
case 1:
num=sqLiteDatabase.delete(Table_Name, selection, selectionArgs);
break;
case 2:
long id=Content
Uris.parseId(
uri);
selection=(selection==null||"".equals(selection.trim()))?_id+"="+id:selection+"and"+_id+"="+id;
num=sqLiteDatabase.delete(Table_Name, selection, selectionArgs);
default:
throw new IllegalArgumentException("异常参数");
}
return num;
}
private final String DB_Name = "mydb.db";
private final String Table_Name="contacter";
private final int version_1=1;
private class MyOpenHelper extends SQLiteOpenHelper {
public MyOpenHelper(Context context, String name,
CursorFactory factory, int version) {
super(context, name, factory, version);
}
/**
* @description 当数据表无连接时创建新的表
*/
@Override
public void onCreate(SQLiteDatabase db) {
String sql = " create table if not exists " + Table_Name
+ "(id INTEGER PRIMARY KEY AUTOINCREMENT," +
"name varchar(64),num varchar(64))";
db.execSQL(sql);
}
/**
* @description 当版本更新时触发的方法
*/
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
String sql = " drop table if exists " + Table_Name;
db.execSQL(sql);
onCreate(db);
}
}
}
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.tigongzhe"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="18" />
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="com.example.tigongzhe.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=".provider"
android:authorities="com.example.tigongzhe.provider"
android:multiprocess="true"
android:exported="true"
android:permission="com.example.tigongzhe.permission"
></provider>
</application>
<permission android:name="com.example.tigongzhe.permission"
android:protectionLevel="normal"></permission>
</manifest>
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++package com.example.tigongzhe;
import android.R.integer;
import android.content.
ContentProvider;
import android.content.Content
Uris;
import android.content.ContentValues;
import android.content.Context;
import android.content.
UriMatcher;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteDatabase.CursorFactory;
import android.database.sqlite.SQLiteOpenHelper;
import android.net.
Uri;
import android.provider.SyncStateContract.Helpers;
import android.text.Selection;
import android.util.Log;
public class provider extends
ContentProvider {
private MyOpenHelper myOpenHelper;
private SQLiteDatabase sqLiteDatabase;
private static final
UriMatcher
URI_MATCHER=new
UriMatcher(
UriMatcher.NO_MATCH);
private final String TAG="provider";
private static final String authority="com.example.tigongzhe.provider";
static {
URI_MATCHER.add
URI(authority, "contacter", 1);
URI_MATCHER.add
URI(authority, "contacter/#", 2);
}
private static final String _id="id";
private static final String name="name";
private static final String num="num";
@Override
public boolean onCreate() {
// TODO Auto-generated method stub
myOpenHelper=new MyOpenHelper(getContext(), DB_Name, null, version_1);
return true;
}
@Override
public String getType(
Uri uri) {
// TODO Auto-generated method stub
int flag=
URI_MATCHER.match(
uri);
switch (flag) {
case 2:
return "vnd.android.cursor.item/contacter";
case 1:
return "vnd.android.dir.item/contacter";
default:
throw new IllegalArgumentException("异常参数");
}
}
@Override
public
Uri insert(
Uri uri, ContentValues values) {
// TODO Auto-generated method stub
sqLiteDatabase=myOpenHelper.getWritableDatabase();
int flag=
URI_MATCHER.match(
uri);
switch (flag) {
case 1:
sqLiteDatabase.insert(Table_Name, name, values);
break;
case 2:
long id=sqLiteDatabase.insert(Table_Name, name, values);
Content
Uris.withAppendedId(
uri, id);
default:
break;
}
return
uri;
}
@Override
public Cursor query(
Uri uri, String[] arg1, String arg2, String[] arg3,
String arg4) {
// TODO Auto-generated method stub
Cursor cursor;
sqLiteDatabase=myOpenHelper.getReadableDatabase();
int flag=
URI_MATCHER.match(
uri);
switch (flag) {
case 1:
cursor=sqLiteDatabase.query(Table_Name, arg1, arg2, arg3, null, null,arg4);
break;
case 2:
long id=Content
Uris.parseId(
uri);
arg2=(arg2==null||"".equals(arg2.trim()))? _id+"="+id:arg2+"and"+_id+"="+id;
cursor=sqLiteDatabase.query(Table_Name, arg1, arg2, arg3, null, null,arg4);
default:
throw new IllegalArgumentException("参数错误");
}
return cursor;
}
@Override
public int update(
Uri uri, ContentValues values, String selection,
String[] selectionArgs) {
// TODO Auto-generated method stub
int num=0;
sqLiteDatabase=myOpenHelper.getWritableDatabase();
int flag=
URI_MATCHER.match(
uri);
switch (flag) {
case 1:
num=sqLiteDatabase.update(Table_Name, values,selection, selectionArgs);
break;
case 2:
long id=Content
Uris.parseId(
uri);
selection=(selection==null||"".equals(selection.trim()))?
_id+"="+id:selection+"and"+_id+"="+id;
num=sqLiteDatabase.update(Table_Name, values,selection, selectionArgs);
default:
break;
}
return num;
}
@Override
public int delete(
Uri uri, String selection, String[] selectionArgs) {
// TODO Auto-generated method stub
int num=0;
sqLiteDatabase=myOpenHelper.getWritableDatabase();
int flag=
URI_MATCHER.match(
uri);
switch (flag) {
case 1:
num=sqLiteDatabase.delete(Table_Name, selection, selectionArgs);
break;
case 2:
long id=Content
Uris.parseId(
uri);
selection=(selection==null||"".equals(selection.trim()))?_id+"="+id:selection+"and"+_id+"="+id;
num=sqLiteDatabase.delete(Table_Name, selection, selectionArgs);
default:
throw new IllegalArgumentException("异常参数");
}
return num;
}
private final String DB_Name = "mydb.db";
private final String Table_Name="contacter";
private final int version_1=1;
private class MyOpenHelper extends SQLiteOpenHelper {
public MyOpenHelper(Context context, String name,
CursorFactory factory, int version) {
super(context, name, factory, version);
}
/**
* @description 当数据表无连接时创建新的表
*/
@Override
public void onCreate(SQLiteDatabase db) {
String sql = " create table if not exists " + Table_Name
+ "(id INTEGER PRIMARY KEY AUTOINCREMENT," +
"name varchar(64),num varchar(64))";
db.execSQL(sql);
}
/**
* @description 当版本更新时触发的方法
*/
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
String sql = " drop table if exists " + Table_Name;
db.execSQL(sql);
onCreate(db);
}
}
}
本文详细介绍了如何使用ContentProvider在Android系统中访问联系人、短信、图片、音乐和视频等资源，通过具体代码示例展示了如何利用ContentResolver进行数据查询。
扫一扫
375
被折叠的 条评论
为什么被折叠?
到【灌水乐园】发言
