packages not found but added in libraries...

This is my code.

package com.example.syn.coinpay;

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;
import org.bitcoinj.core.Context;
import org.bitcoinj.core.NetworkParameters;
import org.bitcoinj.core.Peer;
import org.bitcoinj.core.listeners.DownloadProgressTracker;
import org.bitcoinj.kits.WalletAppKit;
import org.bitcoinj.params.BCCTestNet3Params;
import org.bitcoinj.params.TestNet3Params;

import java.io.File;
import java.util.Date;

public class mainpage extends AppCompatActivity{
    public static NetworkParameters BTCparams = TestNet3Params.get();
    public static WalletAppKit BTCkit = new WalletAppKit(BTCparams,new File("."),"BTC-Test");
    public static NetworkParameters BCHparams = BCCTestNet3Params.get();
    public static WalletAppKit BCHkit = new WalletAppKit(BCHparams,new File("."),"BCH-Test");
    public static Double handleFee = 0.035;
    public static String handleAddress = "mtcH4NTs32vDRRemz6DotHYokn5zRHWxRY";
    static private Integer productid = 1;
    static Object[] account = backend.account(productid);
    static String[] server = backend.select("SELECT rates, status, contact, provider FROM server");

    @Override
    public void onWindowFocusChanged(boolean hasFocus) {
        super.onWindowFocusChanged(hasFocus);
        if (hasFocus) {
            hideSystemUI();
        }
    }

    private void hideSystemUI() {
        View decorView = getWindow().getDecorView();
        decorView.setSystemUiVisibility(View.SYSTEM_UI_FLAG_IMMERSIVE | View.SYSTEM_UI_FLAG_LAYOUT_STABLE | View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION | View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN | View.SYSTEM_UI_FLAG_HIDE_NAVIGATION | View.SYSTEM_UI_FLAG_FULLSCREEN);
    }

    @Override
    protected void onCreate(Bundle savedInstanceState){
        super.onCreate(savedInstanceState);
        setContentView(R.layout.mainpage);
        hideSystemUI();
        Toast.makeText(getApplicationContext(),"Account : "+account[1],Toast.LENGTH_LONG).show();
        Button but = findViewById(R.id.button);
        Context.propagate(new Context(BTCparams));
        DownloadProgressTracker BTCListener = new DownloadProgressTracker() {
            @Override
            public void onChainDownloadStarted(Peer peer, int blocksLeft){
                Toast.makeText(getApplicationContext(),"Syncing",Toast.LENGTH_LONG).show();
            }
            @Override
            public void progress(double pct, int blocksSoFar, Date date) {
                System.out.println(backend.strFormat("GOOD", "BTC", "GOOD", "BlockChain " + (int) pct + "%"));
                //Diagnostic.BTCProgress = (int) pct;
            }

            @Override
            public void doneDownload() {
                System.out.println(backend.strFormat("PASS", "BTC", "PASS", "BlockChain Complete"));
                //Diagnostic.BTCProgress = 100;
                Toast.makeText(getApplicationContext(),"Done Syncing",Toast.LENGTH_LONG).show();
            }
        };
        BTCkit.setDownloadListener(BTCListener).setBlockingStartup(false).startAsync().awaitRunning();
    }
}

The above is 2 classes im working on android. I added the libraryes for sarxos, bitcoinj, etc.. All the errors are related to not finding those libraries.

the error output is...

error: cannot find symbol variable Context