自建一个provider，然后在另一个app中用resolver调用

实现代码：

contentprovider：

package com.example.contentprovider;

import android.content.ContentProvider;
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.net.Uri;

public class MyContentProvider extends ContentProvider {
    private MyDao mydao;
    public MyContentProvider() {
    }

    @Override
    public int delete(Uri uri, String selection, String[] selectionArgs) {
        // Implement this to handle requests to delete one or more rows.
        throw new UnsupportedOperationException("Not yet implemented");
    }

    @Override
    public String getType(Uri uri) {
        // TODO: Implement this to handle requests for the MIME type of the data
        // at the given URI.
        throw new UnsupportedOperationException("Not yet implemented");
    }

    @Override
    public Uri insert(Uri uri, ContentValues values) {
        // TODO: Implement this to handle requests to insert a new row.
        return mydao.lytInsert(values);
    }

    @Override
    public boolean onCreate() {
        // TODO: Implement this to initialize your content provider on startup.
        Context context=getContext();
        mydao=new MyDao(context);
        return false;
    }

    @Override
    public Cursor query(Uri uri, String[] projection, String selection,
                        String[] selectionArgs, String sortOrder) {
        // TODO: Implement this to handle query requests from clients.
        throw new UnsupportedOperationException("Not yet implemented");
    }

    @Override
    public int update(Uri uri, ContentValues values, String selection,
                      String[] selectionArgs) {
        // TODO: Implement this to handle requests to update one or more rows.
        throw new UnsupportedOperationException("Not yet implemented");
    }
}

Dao:

package com.example.contentprovider;

import android.content.ContentUris;
import android.content.ContentValues;
import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.net.Uri;

public class MyDao {
    private final Context context;
    private SQLiteDatabase database;

    public MyDao(Context context){
        this.context=context;
        MyDBhelper dbHelper=new MyDBhelper(context,"lytDB",null,1);
        database=dbHelper.getWritableDatabase();
    }


    public Uri lytInsert(ContentValues values){
        long rowId=database.insert("student",null,values);

        Uri uri=Uri.parse("context://lyt.provider1/student");
        Uri inserturi= ContentUris.withAppendedId(uri,rowId);
        context.getContentResolver().notifyChange(inserturi,null);

        return inserturi;
    }
}

resolver

package com.example.contentresolver;

import android.content.ContentResolver;
import android.content.ContentValues;
import android.net.Uri;
import android.os.Bundle;
import android.widget.Button;

import androidx.appcompat.app.AppCompatActivity;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        ContentResolver resolver=getContentResolver();

        ContentValues values=new ContentValues();
        values.put("name","lyt");
        values.put("age","20");
        Uri uri=Uri.parse("Content://lyt.provider1/student");
        Button button=findViewById(R.id.button);
        button.setOnClickListener(v->{
            resolver.insert(uri,values);
        });

    }
}

成果截图：

gitee仓库：https://gitee.com/liu6190/android-work3