1.Provider组件申请和实现
<!-- content provider组件申请 -->
<provider android:name=".PersonProvider"
android:authorities="cn.itcast.provider.personProvider"/>
//内容提供者，内容提供方
public class PersonProvider extends ContentProvider {
private DBOpenHelper dbOpenHelper;
private static final String base="cn.itcast.provider.personProvider";
private static final UriMatcher Matcher=new UriMatcher(UriMatcher.NO_MATCH);
private static final int persons=1;
private static final int person=2;
static{
Matcher.addURI(base,"person",persons);
//android中#代表数字,*代表所有字符
Matcher.addURI(base,"person/#",person);
}
//服务初始化执行
@Override
public boolean onCreate() {
dbOpenHelper=new DBOpenHelper(getContext());
return true;
}
@Override
public int delete(Uri uri, String selection, String[] selectionArgs) {
SQLiteDatabase db=dbOpenHelper.getReadableDatabase();
int num=0;
switch (Matcher.match(uri)){
case persons:
num=db.delete("person",selection,selectionArgs);
return num;
case person:
long rowid=ContentUris.parseId(uri);
String where="id="+rowid;
if(selection!=null&&!"".equals(selection.trim()))
where+=" and "+selection;
num=db.delete("person",where,selectionArgs);
return num;
default:
throw new IllegalArgumentException("未知请求 ："+uri);
}
}
@Override
public String getType(Uri uri) {
switch (Matcher.match(uri)){
case persons:
return "vnd.android.cursor.dir/person";
case person:
return "vnd.android.cursor.item/person";
default:
throw new IllegalArgumentException("未知请求 ："+uri);
}
}
@Override
public Uri insert(Uri uri, ContentValues values) {
SQLiteDatabase db=dbOpenHelper.getReadableDatabase();
switch (Matcher.match(uri)){
case persons:
long rowid=db.insert("person","", values);//主键值
Uri insertUri=Uri.parse("content://"+base+"/person/"+rowid);
//ContentUris.withAppendedId(uri, rowid);
//发出数据变化通知,第二个参数是必须获取到变化的接收者
getContext().getContentResolver().notifyChange(uri, null);
return insertUri;
default:
throw new IllegalArgumentException("未知请求 ："+uri);
}
}
@Override
public Cursor query(Uri uri, String[] projection, String selection,
String[] selectionArgs, String sortOrder) {
SQLiteDatabase db=dbOpenHelper.getReadableDatabase();
switch (Matcher.match(uri)){
case persons:
return db.query("person",projection, selection, selectionArgs,null,null,sortOrder);
case person:
long rowid=ContentUris.parseId(uri);
String where="id="+rowid;
if(selection!=null&&!"".equals(selection.trim()))
where+=" and "+selection;
return db.query("person",projection,where, selectionArgs,null,null,sortOrder);
default:
throw new IllegalArgumentException("未知请求 ："+uri);
}
}
@Override
public int update(Uri uri, ContentValues values, String selection,
String[] selectionArgs) {
SQLiteDatabase db=dbOpenHelper.getReadableDatabase();
int num=0;
switch (Matcher.match(uri)){
case persons:
num=db.update("person",values,selection,selectionArgs);
return num;
case person:
long rowid=ContentUris.parseId(uri);
String where="id="+rowid;
if(selection!=null&&!"".equals(selection.trim()))
where+=" and "+selection;
num=db.update("person",values,where,selectionArgs);
return num;
default:
throw new IllegalArgumentException("未知请求 ："+uri);
}
}
}
2.新建其他项目，测试调用项目的Provider
public class PersonContentProviderTest extends AndroidTestCase {
//content provider 访问测试
public void testInsert() throws Exception{
Uri uri=Uri.parse("content://cn.itcast.provider.personProvider/person");
ContentResolver resolver=getContext().getContentResolver();
ContentValues values=new ContentValues();
values.put("name","tangSeng");
values.put("phone","110");
values.put("amount","10");
resolver.insert(uri, values);
}
public void testDelete() throws Exception{
Uri uri=Uri.parse("content://cn.itcast.provider.personProvider/person/2");
ContentResolver resolver=getContext().getContentResolver();
resolver.delete(uri,null,null);
}
public void testUpdate() throws Exception{
Uri uri=Uri.parse("content://cn.itcast.provider.personProvider/person/3");
ContentResolver resolver=getContext().getContentResolver();
ContentValues values=new ContentValues();
values.put("name","shaSeng");
values.put("phone","114");
values.put("amount","14");
resolver.update(uri, values,null,null);
}
public void testQuery() throws Exception{
Uri uri=Uri.parse("content://cn.itcast.provider.personProvider/person");
ContentResolver resolver=getContext().getContentResolver();
Cursor cursor=resolver.query(uri,null,null,null,null);
while(cursor.moveToNext()){
String name=cursor.getString(cursor.getColumnIndex("name"));
String phone=cursor.getString(cursor.getColumnIndex("phone"));
Log.i("db",name+"-"+phone);
}
cursor.close();
}
}
///////////////为新项目添加Content Provider数据变更通知
public class OtherAndroidActivity extends Activity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
//注册content provider数据变化监听器
Uri uri=Uri.parse("content://cn.itcast.provider.personProvider/persons");
this.getContentResolver().registerContentObserver(uri,true,
new PersonContentObserver(new Handler()));
}
public void insert(View v){
Uri uri=Uri.parse("content://cn.itcast.provider.personProvider/person");
ContentResolver resolver=getApplicationContext().getContentResolver();
ContentValues values=new ContentValues();
values.put("name","zhuBaJie");
values.put("phone","113");
values.put("amount","13");
resolver.insert(uri, values);
Toast.makeText(getApplicationContext(),"保存成功", 2);
}
//content provider 监听信息接收对象
private class PersonContentObserver extends ContentObserver{
public PersonContentObserver(Handler handler) {
super(handler);
}
@Override
public void onChange(boolean selfChange) {
//super.onChange(selfChange);
Uri uri=Uri.parse("content://cn.itcast.provider.personProvider/person");
ContentResolver resolver=getApplicationContext().getContentResolver();
Cursor cursor=resolver.query(uri, null, null,null,"id desc limit 1");
if(cursor.moveToFirst()){
String name=cursor.getString(cursor.getColumnIndex("name"));
Toast.makeText(getApplicationContext(), "新增:"+name, 1);
}
}
}
}
