DDM 2022-12-21

package com.joythis.android.webfavorites;

import androidx.appcompat.app.AppCompatActivity;
import androidx.loader.content.AsyncTaskLoader;

import android.content.Intent;
import android.net.Uri;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.Handler;
import android.os.Looper;
import android.util.Log;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.Spinner;
import android.widget.TextView;

import java.util.Calendar;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

public class MainActivity extends AppCompatActivity {

    class MinhaTarefaAssincrona extends AsyncTask<String, Void, String>{
        @Override
        protected String doInBackground(String... strings) {
            //código que seja preciso executar em thread própria
            //deve escrever-se aqui
            String url = strings[0];
            return AmIoHttp.io_https_ReadAll(url);
        }//doInBackground

        //automaticamente chamado depois de doInBackground terminar
        @Override
        protected void onPostExecute(String s) {
            super.onPostExecute(s);
            mTvResult.setText(s);
        }//onPostExecute
    }//MinhaTarefaAssincrona


    public final static String KEY_URL = "KEY_URL";

    public final static String PACKAGE_GOOGLE_CHROME =
        "com.android.chrome";

    public final static String PACKAGE_BROWSER_XPTO =
            "com.browser.xpto";

    Spinner mSpnBrowseMode;
    Button mBtnBrowseUrl1, mBtnBrowseUrl2, mBtnBrowseUrl3;
    TextView mTvResult;

    View.OnClickListener mClickHandler = new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            String webAddress = ((Button)v).getText().toString().trim();
            int browseMode = mSpnBrowseMode.getSelectedItemPosition();
            visitUrl(
                webAddress,
                browseMode
            );
        }
    };//mClickHandler

    void visitUrl(String pUrl, int pMode){
        Uri uriUrl = Uri.parse(pUrl);
        Intent visitUrl;
        switch(pMode) {
            case 0: // via chooser
                visitUrl = new Intent(Intent.ACTION_VIEW);
                visitUrl.setData(uriUrl);
                /*
                aparece um "chooser" - um diálogo em que o user
                é perguntado com qual app (de entre várias disponíveis)
                pretende fazer a ação
                 */
                startActivity(visitUrl);
                break;
            case 1: // via chrome package (potencial de falha)
                try {
                    visitUrl = new Intent(Intent.ACTION_VIEW);
                    visitUrl.setData(uriUrl);
                    visitUrl.setPackage(PACKAGE_GOOGLE_CHROME);
                    startActivity(visitUrl);
                }
                catch (Exception e){
                    Log.e("@visitUrl", e.toString());
                }
            case 2: // via in-app web browser
                visitUrl = new Intent(
                    MainActivity.this,
                    MyWebBrowser.class
                );
                visitUrl.putExtra(
                    KEY_URL, pUrl
                );
                startActivity(visitUrl);
                break;
        }//switch
    }//visitUrl

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

        init();
    }

    void populateSpinner(Spinner pSpn, String[] pPop){
        if(pSpn!=null){
            ArrayAdapter<String> ad = new ArrayAdapter<>(
                MainActivity.this,
                android.R.layout.simple_spinner_item,
                pPop
            );
            ad.setDropDownViewResource(
                android.R.layout.simple_spinner_dropdown_item
            );
            pSpn.setAdapter(ad);
        }//if
    }//populateSpinner

    void init(){
        //assocs
        mSpnBrowseMode = findViewById(R.id.idSpnBrowseMode);
        mBtnBrowseUrl1 = findViewById(R.id.idBtnVisitUrl1);
        mBtnBrowseUrl2 = findViewById(R.id.idBtnVisitUrl2);
        mBtnBrowseUrl3 = findViewById(R.id.idBtnVisitUrl3);
        mTvResult = findViewById(R.id.idTvResult);

        //behaviors
        String[] aBrowseModes = this.getResources().getStringArray(R.array.a_browse_modes);

        populateSpinner(
            mSpnBrowseMode,
            aBrowseModes
        );

        mBtnBrowseUrl1.setOnClickListener(mClickHandler);
        mBtnBrowseUrl2.setOnClickListener(mClickHandler);
        mBtnBrowseUrl3.setOnClickListener(mClickHandler);

        exemploDeConsumoDeUrl();
    }//init

    // não vai funcionar porque está síncrona com a main thread
    // só funcionará se ASSÍNCRONA da main thread
    // como executar isto assincronamente?????
    // resposta 1: declarar uma classe nossa que especialize AsyncTask
    void exemploDeConsumoDeUrl_vFAIL(){
        // android.os.NetworkOnMainThreadException
        String strHtml =
            AmIoHttp.io_https_ReadAll(
                "https://arturmarques.com/edu/ddm/"
            );

        mTvResult.setText(strHtml);
    }//exemploDeConsumoDeUrl_vFAIL

    void exemploDeConsumoDeUrl_deprecated(){
        MinhaTarefaAssincrona t = new MinhaTarefaAssincrona();
        t.execute("https://arturmarques.com/edu/ddm/");
    }//exemploDeConsumoDeUrl_deprecated

    // versão não deprecated
    /*
    import java.util.concurrent.ExecutorService;
    import java.util.concurrent.Executors;
     */
    String mResultadoAssincrono;
    void exemploDeConsumoDeUrl(){
        ExecutorService executor = Executors.newSingleThreadExecutor();
        Handler handler = new Handler(Looper.getMainLooper());

        Runnable atualizarUI = new Runnable() {
            @Override
            public void run() {
                MainActivity.this.mTvResult.setText(mResultadoAssincrono);
            }
        };//atualizarUI

        Runnable irBuscarDadosWeb = new Runnable() {
            @Override
            public void run() {
                mResultadoAssincrono = AmIoHttp.io_https_ReadAll("https://arturmarques.com/edu/ddm/");

                handler.post(atualizarUI);
            }
        };

        executor.execute(irBuscarDadosWeb);
    }//exemploDeConsumoDeUrl
}//MainActivity