android开发笔记之ContentProvider使用样例一
1.说明：
ContentProvider作为android的四大组件，主要是用来保存一些复杂的数据，并且db数据各个app应用都可以读取，操作。这个例子，主要是在db数据库中新建一个表，并提供正常的增，删，改，查操作和使用AsyncQueryHandler来异步对db数据库的数据进行增，删，改，查操作，以减少操作的时间，提高效率！
2.效果图：
3.详细代码：
(1)PersonInfo.java
package com.example.testcontentprovider01;
public class PersonInfo {
public String name;
public String gender;
public int age;
public PersonInfo(String name,String gender,int age){
this.name = name;
this.gender = gender;
this.age = age;
}
public String getName(){
return name;
}
public void setName(String name){
this.name = name;
}
public String getGender(){
return gender;
}
public void setGender(String gender){
this.gender = gender;
}
public int getAge(){
return age;
}
public void setAge(int age){
this.age = age;
}
@Override
public String toString() {
// TODO Auto-generated method stub
return super.toString()+"--name:"+name+"--gender:"+gender+"--age:"+age;
}
}
(2)DatabaseHelper.java
package com.example.testcontentprovider01;
import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
public class DatabaseHelper extends SQLiteOpenHelper {
private static final String DATABASE_NAME = "db_demo.db";
private static final int DATABASE_VERSION = 1;
public DatabaseHelper(Context context){
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
@Override
public void onCreate(SQLiteDatabase db) {
// TODO Auto-generated method stub
db.execSQL("CREATE TABLE " + Provider.Person.TABLE_NAME + " ("
+ Provider.Person._ID + " INTEGER PRIMARY KEY,"
+ Provider.Person.NAME + " TEXT,"
+ Provider.Person.GENDER + " TEXT,"
+ Provider.Person.AGE + " INTEGER"
+ ");");
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
// TODO Auto-generated method stub
db.execSQL("DROP TABLE IF EXISTS " + Provider.Person.TABLE_NAME);
onCreate(db);
}
}
(3)Provider.java
package com.example.testcontentprovider01;
import android.net.Uri;
import android.provider.BaseColumns;
public class Provider{
public static final String AUTHORITY = "com.android.provider.demo.person";
public static final String CONTENT_TYPE = "vnd.android.cursor.dir/vnd.android.demo";
public static final String CONTENT_ITEM_TYPE = "vnd.android.cursor.item/vnd.android.demo";
public static final class Person implements BaseColumns {
public static final Uri CONTENT_URI = Uri.parse("content://"+ AUTHORITY +"/persons");
public static final String TABLE_NAME = "table_person";
public static final String DEFAULT_SORT_ORDER = "age desc";
public static final String NAME = "name";
public static final String GENDER = "gender";
public static final String AGE = "age";
}
}
(4)PersonProvider.java
package com.example.testcontentprovider01;
import java.util.HashMap;
import android.content.ContentProvider;
import android.content.ContentUris;
import android.content.ContentValues;
import android.content.UriMatcher;
import android.database.Cursor;
import android.database.SQLException;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteQueryBuilder;
import android.net.Uri;
import android.text.TextUtils;
public class PersonProvider extends ContentProvider{
private static final int PERSONS = 1;
private static final int PERSONS_ID = 2;
private static UriMatcher sUriMatcher;
private DatabaseHelper mOpenHelper;
private static HashMap<String, String> sPersonsProjectionMap;
static {
sUriMatcher = new UriMatcher(UriMatcher.NO_MATCH);
sUriMatcher.addURI(Provider.AUTHORITY, "persons", PERSONS);
sUriMatcher.addURI(Provider.AUTHORITY, "persons/#", PERSONS_ID);
sPersonsProjectionMap = new HashMap<String, String>();
sPersonsProjectionMap.put(Provider.Person._ID, Provider.Person._ID);
sPersonsProjectionMap.put(Provider.Person.NAME, Provider.Person.NAME);
sPersonsProjectionMap.put(Provider.Person.GENDER, Provider.Person.GENDER);
sPersonsProjectionMap.put(Provider.Person.AGE, Provider.Person.AGE);
}
@Override
public boolean onCreate() {
// TODO Auto-generated method stub
mOpenHelper = new DatabaseHelper(getContext());
return true;
}
@Override
public String getType(Uri uri) {
// TODO Auto-generated method stub
switch (sUriMatcher.match(uri)) {
case PERSONS:
return Provider.CONTENT_TYPE;
case PERSONS_ID:
return Provider.CONTENT_ITEM_TYPE;
default:
throw new IllegalArgumentException("Unknown URI " + uri);
}
}
@Override
public Uri insert(Uri uri, ContentValues initialValues) {
// TODO Auto-generated method stub
// Validate the requested uri
if (sUriMatcher.match(uri) != PERSONS) {
throw new IllegalArgumentException("Unknown URI " + uri);
}
ContentValues values;
if (initialValues != null) {
values = new ContentValues(initialValues);
} else {
values = new ContentValues();
}
// Make sure that the fields are all set
if (values.containsKey(Provider.Person.NAME) == false) {
values.put(Provider.Person.NAME, "");
}
if (values.containsKey(Provider.Person.GENDER) == false) {
values.put(Provider.Person.GENDER, "");
}
if (values.containsKey(Provider.Person.AGE) == false) {
values.put(Provider.Person.AGE, 0);
}
SQLiteDatabase db = mOpenHelper.getWritableDatabase();
long rowId = db.insert(Provider.Person.TABLE_NAME, Provider.Person.NAME, values);
if (rowId > 0) {
Uri noteUri = ContentUris.withAppendedId(Provider.Person.CONTENT_URI, rowId);
getContext().getContentResolver().notifyChange(noteUri, null);
return noteUri;
}
throw new SQLException("Failed to insert row into " + uri);
}
@Override
public Cursor query(Uri uri, String[] projection, String selection, String[] selectionArgs,
String sortOrder) {
// TODO Auto-generated method stub
SQLiteQueryBuilder qb = new SQLiteQueryBuilder();
qb.setTables(Provider.Person.TABLE_NAME);
switch (sUriMatcher.match(uri)) {
case PERSONS:
qb.setProjectionMap(sPersonsProjectionMap);
break;
case PERSONS_ID:
qb.setProjectionMap(sPersonsProjectionMap);
qb.appendWhere(Provider.Person._ID + "=" + uri.getPathSegments().get(1));
break;
default:
throw new IllegalArgumentException("Unknown URI " + uri);
}
// If no sort order is specified use the default
String orderBy;
if (TextUtils.isEmpty(sortOrder)) {
orderBy = Provider.Person.DEFAULT_SORT_ORDER;
} else {
orderBy = sortOrder;
}
// Get the database and run the query
SQLiteDatabase db = mOpenHelper.getReadableDatabase();
Cursor c = qb.query(db, projection, selection, selectionArgs, null, null, orderBy);
// Tell the cursor what uri to watch, so it knows when its source data changes
c.setNotificationUri(getContext().getContentResolver(), uri);
return c;
}
@Override
public int update(Uri uri, ContentValues values, String where, String[] whereArgs) {
// TODO Auto-generated method stub
SQLiteDatabase db = mOpenHelper.getWritableDatabase();
int count;
switch (sUriMatcher.match(uri)) {
case PERSONS:
count = db.update(Provider.Person.TABLE_NAME, values, where, whereArgs);
break;
case PERSONS_ID:
String noteId = uri.getPathSegments().get(1);
count = db.update(Provider.Person.TABLE_NAME, values, Provider.Person._ID + "=" + noteId
+ (!TextUtils.isEmpty(where) ? " AND (" + where + ')' : ""), whereArgs);
break;
default:
throw new IllegalArgumentException("Unknown URI " + uri);
}
getContext().getContentResolver().notifyChange(uri, null);
return count;
}
@Override
public int delete(Uri uri, String where, String[] whereArgs) {
// TODO Auto-generated method stub
SQLiteDatabase db = mOpenHelper.getWritableDatabase();
int count;
switch (sUriMatcher.match(uri)) {
case PERSONS:
count = db.delete(Provider.Person.TABLE_NAME, where, whereArgs);
break;
case PERSONS_ID:
String noteId = uri.getPathSegments().get(1);
count = db.delete(Provider.Person.TABLE_NAME, Provider.Person._ID + "=" + noteId
+ (!TextUtils.isEmpty(where) ? " AND (" + where + ')' : ""), whereArgs);
break;
default:
throw new IllegalArgumentException("Unknown URI " + uri);
}
getContext().getContentResolver().notifyChange(uri, null);
return count;
}
}(5)MainActivity.java
package com.example.testcontentprovider01;
import com.example.testcontentprovider01.Provider.Person;
import android.os.Bundle;
import android.app.Activity;
import android.content.ContentValues;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
public class MainActivity extends Activity implements OnClickListener{
private Button myInserButton = null;
private Button myDeleButton = null;
private Button myUpdateButton = null;
private Button myQueryButton = null;
private Button myAsyInserButton = null;
private Button myAsyDeleButton = null;
private Button myAsyUpdateButton = null;
private Button myAsyQueryButton = null;
private Controller myController = null;
private PersonInfo myPerson = null;
private int i = 0;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
init();
}
private void init() {
// TODO Auto-generated method stub
myInserButton = (Button)findViewById(R.id.myInserButton);
myInserButton.setOnClickListener(this);
myDeleButton = (Button)findViewById(R.id.myDeleButton);
myDeleButton.setOnClickListener(this);
myUpdateButton = (Button)findViewById(R.id.myUpdateButton);
myUpdateButton.setOnClickListener(this);
myQueryButton = (Button)findViewById(R.id.myQueryButton);
myQueryButton.setOnClickListener(this);
myAsyInserButton = (Button)findViewById(R.id.myAsyInserButton);
myAsyInserButton.setOnClickListener(this);
myAsyDeleButton = (Button)findViewById(R.id.myAsyDeleButton);
myAsyDeleButton.setOnClickListener(this);
myAsyUpdateButton = (Button)findViewById(R.id.myAsyUpdateButton);
myAsyUpdateButton.setOnClickListener(this);
myAsyQueryButton = (Button)findViewById(R.id.myAsyQueryButton);
myAsyQueryButton.setOnClickListener(this);
myController = new Controller(this);
}
@Override
public void onClick(View view) {
// TODO Auto-generated method stub
if(view == myInserButton){
Log.i(Controller.TAG, "onClick--myInserButton");
myPerson = new PersonInfo("test_name"+"_"+i,"man",i++);
myController.onInSertDateLister(myPerson);
}else if(view == myDeleButton){
Log.i(Controller.TAG, "onClick--myDeleButton");
String[] deleteValue = {"test_name_0"};
String where = "name";
myController.onDeleteDateLister(where,deleteValue);
}else if(view == myUpdateButton){
Log.i(Controller.TAG, "onClick--myUpdateButton");
ContentValues values = new ContentValues();
values.put(Person.NAME, "testUpdate");
values.put(Person.GENDER, "woman");
values.put(Person.AGE,39);
String where = "name";
String[] selectValue = {"test_name_0"};
myController.onUpdateDateLister(values,where,selectValue);
}else if(view == myQueryButton){
Log.i(Controller.TAG, "onClick--myQueryButton");
myController.onQueryDateLister();
}else if(view == myAsyInserButton){
Log.i(Controller.TAG, "onClick--myAsyInserButton");
myPerson = new PersonInfo("asy_test_name"+"_"+i,"man",i++);
myController.onAsyncInsertDataLister(myPerson);
}else if(view == myAsyDeleButton){
Log.i(Controller.TAG, "onClick--myAsyDeleButton");
String[] deleteValue = {"asy_test_name_0"};
String where = "name";
myController.onAsyncDeleteDataLister(where, deleteValue);
}else if(view == myAsyUpdateButton){
Log.i(Controller.TAG, "onClick--myAsyUpdateButton");
ContentValues values = new ContentValues();
values.put(Person.NAME, "asyTestUpdate");
values.put(Person.GENDER, "asy_woman");
values.put(Person.AGE,39);
String where = "name";
String[] selectValue = {"asy_test_name_0"};
myController.onAsyncUpdateDataLister(values,where,selectValue);
}else if(view == myAsyQueryButton){
Log.i(Controller.TAG, "onClick--myAsyQueryButton");
myController.onAsyncQueryDataLister();
}
}
}
(6)Controller.java
package com.example.testcontentprovider01;
import com.example.testcontentprovider01.Provider.Person;
import android.content.AsyncQueryHandler;
import android.content.ContentResolver;
import android.content.ContentUris;
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.net.Uri;
import android.text.TextUtils;
import android.util.Log;
public class Controller{
public static final String TAG = "TestContentProvider01";
private Context myContext = null;
private AsyncQueryHandler asyncQuery = null;
private String[] PERSON_PROJECTION = new String[] {
Person._ID, // 0
Person.NAME, // 1
Person.GENDER,//2
Person.AGE // 3
};
public Controller(Context myContext){
this.myContext = myContext;
this.asyncQuery = new MyAsyncQueryHandler(myContext.getContentResolver());
}
private class MyAsyncQueryHandler extends AsyncQueryHandler {
public MyAsyncQueryHandler(ContentResolver cr) {
super(cr);
// TODO Auto-generated constructor stub
}
@Override
protected void onDeleteComplete(int token, Object cookie, int result) {
// TODO Auto-generated method stub
Log.i(TAG, "MyAsyncQueryHandler--onDeleteComplete");
super.onDeleteComplete(token, cookie, result);
}
@Override
protected void onInsertComplete(int token, Object cookie, Uri uri) {
// TODO Auto-generated method stub
Log.i(TAG, "MyAsyncQueryHandler--onInsertComplete");
super.onInsertComplete(token, cookie, uri);
}
@Override
protected void onQueryComplete(int token, Object cookie, Cursor cursor) {
// TODO Auto-generated method stub
Log.i(TAG, "MyAsyncQueryHandler--onQueryComplete");
super.onQueryComplete(token, cookie, cursor);
if (cursor != null && cursor.getCount() > 0) {
for (int i = 0; i < cursor.getCount(); i++) {
cursor.moveToPosition(i);
String name = cursor.getString(1);
String gender = cursor.getString(2);
int age = cursor.getInt(3);
Log.i(TAG, "db第"+i+"个数据："+"--name:"+name+"--gender:"+gender+"--age:"+age);
}
cursor.close();
}
}
@Override
protected void onUpdateComplete(int token, Object cookie, int result) {
// TODO Auto-generated method stub
Log.i(TAG, "MyAsyncQueryHandler--onUpdateComplete");
super.onUpdateComplete(token, cookie, result);
}
}
public void onAsyncQueryDataLister() {
// TODO Auto-generated method stub
Log.i(TAG, "Controller--onAsyncQueryDataLister");
asyncQuery.startQuery(0, null, Person.CONTENT_URI, PERSON_PROJECTION, null, null,Person.DEFAULT_SORT_ORDER);
}
public void onAsyncInsertDataLister(PersonInfo myPerson) {
// TODO Auto-generated method stub
Log.i(TAG, "Controller--onAsyncInsertDataLister");
ContentValues values = new ContentValues();
values.put(Person.NAME, myPerson.name);
values.put(Person.GENDER, myPerson.gender);
values.put(Person.AGE, myPerson.age);
asyncQuery.startInsert(0, null, Person.CONTENT_URI, values);
}
public void onAsyncDeleteDataLister(String where, String[] deleteValue) {
// TODO Auto-generated method stub
Log.i(TAG, "Controller--onAsyncDeleteDataLister");
asyncQuery.startDelete(0, null, Person.CONTENT_URI, where+"=?", deleteValue);
}
public void onAsyncUpdateDataLister(ContentValues values, String where, String[] selectValue) {
// TODO Auto-generated method stub
Log.i(TAG, "Controller--onAsyncUpdateDataLister");
asyncQuery.startUpdate(0, null, Person.CONTENT_URI, values, where+"=?", selectValue);
}
public void onInSertDateLister(PersonInfo myPerson) {
// TODO Auto-generated method stub
ContentValues values = new ContentValues();
values.put(Person.NAME, myPerson.name);
values.put(Person.GENDER, myPerson.gender);
values.put(Person.AGE, myPerson.age);
Uri uri = myContext.getContentResolver().insert(Person.CONTENT_URI, values);
String lastPath = uri.getLastPathSegment();
if (TextUtils.isEmpty(lastPath)) {
Log.i(TAG, "insert failure!");
} else {
Log.i(TAG, "insert success! the id is:" + lastPath);
}
}
public void onDeleteDateLister(String where, String[] deleteValue) {
// TODO Auto-generated method stub
// 删除ID为1的记录的方法：
//Uri uri = ContentUris.withAppendedId(Person.CONTENT_URI, 1);
//myContext.getContentResolver().delete(uri, null, null);
myContext.getContentResolver().delete(Person.CONTENT_URI, where+"=?", deleteValue);
Log.i(TAG, "delete data:"+"--where:"+where+"--deleteValue:"+deleteValue);
}
public void onUpdateDateLister(ContentValues values, String where, String[] selectValue) {
// TODO Auto-generated method stub
// 更新ID为1的记录
//Uri uri = ContentUris.withAppendedId(Person.CONTENT_URI, 1);
//myContext.getContentResolver().update(uri, values, null, null);
//getContentResolver().update(uri, values, "name"+"=?", selectValue);
myContext.getContentResolver().update(Person.CONTENT_URI, values, where+"=?", selectValue);
}
public void onQueryDateLister() {
// TODO Auto-generated method stub
Cursor cursor = myContext.getContentResolver().query(Person.CONTENT_URI,
PERSON_PROJECTION, null, null,Person.DEFAULT_SORT_ORDER);
if (cursor.moveToFirst()) {
for (int i = 0; i < cursor.getCount(); i++) {
cursor.moveToPosition(i);
String name = cursor.getString(1);
String gender = cursor.getString(2);
int age = cursor.getInt(3);
Log.i(TAG, "db第"+i+"个数据："+"--name:"+name+"--gender:"+gender+"--age:"+age);
}
}
cursor.close();
}
}
(7)activity_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=".MainActivity" >
<ScrollView
android:layout_width="match_parent"
android:layout_height="match_parent">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
>
<Button
android:id="@+id/myInserButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="正常的插入数据" />
<Button
android:id="@+id/myDeleButton"
android:layout_below="@id/myInserButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="正常的删除数据" />
<Button
android:id="@+id/myUpdateButton"
android:layout_below="@id/myDeleButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="正常的更新数据" />
<Button
android:id="@+id/myQueryButton"
android:layout_below="@id/myUpdateButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="正常的查询数据" />
<Button
android:id="@+id/myAsyInserButton"
android:layout_below="@id/myQueryButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="异步的插入数据" />
<Button
android:id="@+id/myAsyDeleButton"
android:layout_below="@id/myAsyInserButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="异步的删除数据" />
<Button
android:id="@+id/myAsyUpdateButton"
android:layout_below="@id/myAsyDeleButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="异步的更新数据" />
<Button
android:id="@+id/myAsyQueryButton"
android:layout_below="@id/myAsyUpdateButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="异步的查询数据" />
</RelativeLayout>
</ScrollView>
</RelativeLayout>
(8)androidmanifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.testcontentprovider01"
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.testcontentprovider01.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=".PersonProvider"
android:authorities="com.android.provider.demo.person" />
</application>
</manifest>
4.代码下载地址：
http://download.csdn.net/detail/hfreeman2008/7808907
5.参考资料：
1.android 玩转ContentProvider之一－－实现ContentProvider操作数据库
http://blog.csdn.net/maylian7700/article/details/7365368
2.android 玩转ContentProvider之三－－实现一个ContentProvider对多张表进行操作
http://blog.csdn.net/maylian7700/article/details/7365433
3.ContentProvider-----一个完整的样例（一）
http://blog.csdn.net/hfreeman2011/article/details/8556445
4.Android 异步开发之 AsyncQueryHandler
http://blog.csdn.net/hfreeman2011/article/details/8555474