AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"package="com.hipeak.demo0804"><applicationandroid:allowBackup="true"android:icon="@mipmap/ic_launcher"android:label="@string/app_name"android:roundIcon="@mipmap/ic_launcher_round"android:supportsRtl="true"android:theme="@style/Theme.Demo0804"><activityandroid:name=".MainActivity"android:exported="true"><intent-filter><action android:name="android.intent.action.MAIN" /><category android:name="android.intent.category.LAUNCHER" /></intent-filter></activity><providerandroid:authorities="com.hipeak.demo0804.stuprovider"android:name=".StuProvider"android:exported="true"android:enabled="true"/></application></manifest>

MainActivity

package com.hipeak.demo0804;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;import androidx.annotation.NonNull;
import androidx.annotation.Nullable;public class StuProvider extends ContentProvider {private SchoolDBHelper helper;/*** 匹配URi的容器*  构造的code：匹配不上的时候，code是多少，默认是NO_MATCH -1*/private static UriMatcher matcher=new UriMatcher(UriMatcher.NO_MATCH);private static final int CODE_STU=1;private static final int CODE_STU_ID=2;static{matcher.addURI("com.hipeak.demo0804.stuprovider","/stu",CODE_STU);matcher.addURI("com.hipeak.demo0804.stuprovider","/stu/#",CODE_STU_ID);}//当应用启动的时候创建StuProvider对象，当创建对象的时候onCreate()//初始化helper
//    private@Overridepublic boolean onCreate() {Log.d("", "===onCteate");helper=new SchoolDBHelper(getContext(),1);return false;}/**** @param uri  一个资源的唯一标识* @param projection 多个字段* @param selection where条件 如：id=？and name=?* @param selectionArgs  where条件需要的值* @param sortOrder 排序规则* @return** content://com.hipeak.demo0804.stuprovider/stu    不根据id查询* content://com.hipeak.demo0804.stuprovider/stu/1  根据id查询*/@Nullable@Overridepublic Cursor query(@NonNull Uri uri,@Nullable String[] projection,@Nullable String selection,@Nullable String[] selectionArgs,@Nullable String sortOrder) {SQLiteDatabase db = helper.getReadableDatabase();int code = matcher.match(uri);switch(code){case CODE_STU:return db.query("stu",projection,selection,selectionArgs,null,null,sortOrder);case CODE_STU_ID://TODO uri中的id获取long id=ContentUris.parseId(uri);//uri中的idreturn db.query("stu",projection,"_id=?",new String[]{id+""},null,null,sortOrder);default:Log.e("","Uri不符合规则");throw new RuntimeException("Uri不符合规则");}}@Nullable@Overridepublic String getType(@NonNull Uri uri) {return null;}//* * content://com.hipeak.demo0804.stuprovider/stu    不根据插入@Nullable@Overridepublic Uri insert(@NonNull Uri uri, @Nullable ContentValues values) {SQLiteDatabase db = helper.getWritableDatabase();int code =matcher.match(uri);if(code==CODE_STU){long id = db.insert("stu", null, values);Log.d("","id==="+id);db.close();return ContentUris.withAppendedId(uri,id);}else{Log.e("","Uri不符合规则");db.close();throw new RuntimeException("Uri不符合规则");}}/***  content://com.hipeak.demo0804.stuprovider/stu    不根据id删除*  content://com.hipeak.demo0804.stuprovider/stu/1  根据id删除* @param uri* @param selection* @param selectionArgs* @return*/@Overridepublic int delete(@NonNull Uri uri, @Nullable String selection, @Nullable String[] selectionArgs) {SQLiteDatabase db = helper.getWritableDatabase();int code=matcher.match(uri);int count=0;switch(code){case CODE_STU:count = db.delete("stu", selection, selectionArgs);//删掉了几行db.close();break;case CODE_STU_ID:long id=ContentUris.parseId(uri);count=db.delete("stu","_id=?",new String[]{id+""});db.close();break;default:throw new RuntimeException("Uri不符合规则");}return count;}@Overridepublic int update(@NonNull Uri uri, @Nullable ContentValues values, @Nullable String selection, @Nullable String[] selectionArgs) {return 0;}}

SchoolDBHelper

package com.hipeak.demo0804;import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;import androidx.annotation.Nullable;public class SchoolDBHelper extends SQLiteOpenHelper {private static final String DB_NAME="school.db";public SchoolDBHelper(@Nullable Context context, int version) {super(context, DB_NAME, null, version);}@Overridepublic void onCreate(SQLiteDatabase sqLiteDatabase) {//String sql="create table stu(" +"_id integer primary key autoincrement" +",name text" +",age integer );";sqLiteDatabase.execSQL(sql);String sql2="insert into stu(name,age) values('张三',21),('李四',21),('王五',26)" ;sqLiteDatabase.execSQL(sql2);}@Overridepublic void onUpgrade(SQLiteDatabase sqLiteDatabase, int i, int i1) {}
}

StuProvider

package com.hipeak.demo0804;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;import androidx.annotation.NonNull;
import androidx.annotation.Nullable;public class StuProvider extends ContentProvider {private SchoolDBHelper helper;/*** 匹配URi的容器*  构造的code：匹配不上的时候，code是多少，默认是NO_MATCH -1*/private static UriMatcher matcher=new UriMatcher(UriMatcher.NO_MATCH);private static final int CODE_STU=1;private static final int CODE_STU_ID=2;static{matcher.addURI("com.hipeak.demo0804.stuprovider","/stu",CODE_STU);matcher.addURI("com.hipeak.demo0804.stuprovider","/stu/#",CODE_STU_ID);}//当应用启动的时候创建StuProvider对象，当创建对象的时候onCreate()//初始化helper
//    private@Overridepublic boolean onCreate() {Log.d("", "===onCteate");helper=new SchoolDBHelper(getContext(),1);return false;}/**** @param uri  一个资源的唯一标识* @param projection 多个字段* @param selection where条件 如：id=？and name=?* @param selectionArgs  where条件需要的值* @param sortOrder 排序规则* @return** content://com.hipeak.demo0804.stuprovider/stu    不根据id查询* content://com.hipeak.demo0804.stuprovider/stu/1  根据id查询*/@Nullable@Overridepublic Cursor query(@NonNull Uri uri,@Nullable String[] projection,@Nullable String selection,@Nullable String[] selectionArgs,@Nullable String sortOrder) {SQLiteDatabase db = helper.getReadableDatabase();int code = matcher.match(uri);switch(code){case CODE_STU:return db.query("stu",projection,selection,selectionArgs,null,null,sortOrder);case CODE_STU_ID://TODO uri中的id获取long id=ContentUris.parseId(uri);//uri中的idreturn db.query("stu",projection,"_id=?",new String[]{id+""},null,null,sortOrder);default:Log.e("","Uri不符合规则");throw new RuntimeException("Uri不符合规则");}}@Nullable@Overridepublic String getType(@NonNull Uri uri) {return null;}//* * content://com.hipeak.demo0804.stuprovider/stu    不根据插入@Nullable@Overridepublic Uri insert(@NonNull Uri uri, @Nullable ContentValues values) {SQLiteDatabase db = helper.getWritableDatabase();int code =matcher.match(uri);if(code==CODE_STU){long id = db.insert("stu", null, values);Log.d("","id==="+id);db.close();return ContentUris.withAppendedId(uri,id);}else{Log.e("","Uri不符合规则");db.close();throw new RuntimeException("Uri不符合规则");}}/***  content://com.hipeak.demo0804.stuprovider/stu    不根据id删除*  content://com.hipeak.demo0804.stuprovider/stu/1  根据id删除* @param uri* @param selection* @param selectionArgs* @return*/@Overridepublic int delete(@NonNull Uri uri, @Nullable String selection, @Nullable String[] selectionArgs) {SQLiteDatabase db = helper.getWritableDatabase();int code=matcher.match(uri);int count=0;switch(code){case CODE_STU:count = db.delete("stu", selection, selectionArgs);//删掉了几行db.close();break;case CODE_STU_ID:long id=ContentUris.parseId(uri);count=db.delete("stu","_id=?",new String[]{id+""});db.close();break;default:throw new RuntimeException("Uri不符合规则");}return count;}@Overridepublic int update(@NonNull Uri uri, @Nullable ContentValues values, @Nullable String selection, @Nullable String[] selectionArgs) {return 0;}}break;default:throw new RuntimeException("Uri不符合规则");}return count;}@Overridepublic int update(@NonNull Uri uri, @Nullable ContentValues values, @Nullable String selection, @Nullable String[] selectionArgs) {return 0;}}

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自定义provider

文章目录

AndroidManifest.xml

MainActivity

SchoolDBHelper

StuProvider

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