使用ContentProvider实现应用间数据共享

简介

使用ContentProvider可以方便地实现向第三方应用提供本应用数据的增删改查功能。详见官网介绍：
https://developer.android.google.cn/guide/topics/providers/content-providers

代码实现

服务端应用实现

新建一个类，实现ContentProvider的增删改查接口，并定义ContentProvider使用的url：

package com.test.contentproviderserver;
import android.content.ContentProvider;
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 dataProvider extends ContentProvider
{
   
    private SQLiteDatabase db;

    //若不匹配采用UriMatcher.NO_MATCH(-1)返回
    private static final UriMatcher MATCHER = new UriMatcher(UriMatcher.NO_MATCH);

    //匹配码
    private static final int CODE_NAME = 1;
    private static final int CODE_INFO = 2;

    //定义url与匹配码的对应关系
    static
    {
   
        MATCHER.addURI("com.test.dataProvider", "name", CODE_NAME);
        MATCHER.addURI("com.test.dataProvider", "info", CODE_INFO);
    }

    @Override
    public boolean onCreate()
    {
   
        DBHelper helper = new DBHelper(getContext());
        //创建数据库
        db = helper.getWritableDatabase();
        return true;
    }

    /**
     * 外部应用向本应用插入数据
     */
    @Override
    public Uri insert(Uri uri, ContentValues values)
    {
   
        switch (MATCHER.match(uri))
        {
   
            case CODE_NAME:
                Log.d("dataProvider", "insert name");
                try {
   
                    db.insert("name_table", null, values);
                } catch(Exception e) {
   
                    Log.d("dataProvider","insert Exception:" + e);
                }
                break;
            case CODE_INFO:
                Log.d("dataProvider","insert info");
                try {
   
                    db.insert("info_table", null, values);
                } catch(Exception e) {
   
                    Log.d("dataProvider","insert Exception:" + e);
                }
                break;
            default:
                break;
        }

        return null;
    }

    /**
     * 外部应用向本应用删除数据
     */
    @Override
    public int delete(Uri uri, String selection, String[] selectionArgs)
    {
   
        switch (MATCHER.match(uri))
        {
   
            case CODE_NAME:
                Log.d("dataProvider", "delete name");
                try {
   
                    db.delete("name_table", selection, selectionArgs);
                } catch(Exception e) {
   
                    Log.d("dataProvider","delete Exception:" + e);
                }
                break;
            case CODE_INFO:
                Log.d("dataProvider","delete info")<