PrintActivity.java

package com.reqabaweb.healthcontrol.ui.activity;

import android.content.Context;
import android.content.Intent;
import android.os.AsyncTask;
import android.os.Bundle;
import android.print.PrintAttributes;
import android.print.PrintDocumentAdapter;
import android.print.PrintJob;
import android.print.PrintManager;
import android.support.v7.widget.Toolbar;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.RelativeLayout;

import com.reqabaweb.healthcontrol.Const;
import com.reqabaweb.healthcontrol.R;
import com.reqabaweb.healthcontrol.model.Visit;
import com.reqabaweb.healthcontrol.ui.activity.tabs.VisitActivity;
import com.reqabaweb.healthcontrol.util.SessionHandler;
import com.reqabaweb.healthcontrol.util.ToolbarUtils;

import java.io.IOException;
import java.util.concurrent.Executors;

import okhttp3.Call;
import okhttp3.Callback;
import okhttp3.Request;
import okhttp3.Response;

import static com.reqabaweb.healthcontrol.Const.Properties.PARAM_X_AUTH_TOKEN;

public class PrintActivity extends BaseActivity implements Callback {
    private Toolbar toolbar;
    private WebView mWebView;
    private boolean isPageLoaded = false;
    private boolean isDataLoaded = false;
    private Visit visit;
    private Intent i;
    private RelativeLayout progressLayout;
    private DownloadInvoiceTask downloadInvoceTask;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_print);
        i = getIntent();
        downloadInvoceTask=new DownloadInvoiceTask();
        visit = i.getParcelableExtra(VisitActivity.VISIT);
        progressLayout = (RelativeLayout) findViewById(R.id.progress_layout);
        toolbar = (Toolbar) findViewById(R.id.toolbar);
        mWebView = (WebView) findViewById(R.id.webview);
        setupToolBar();
        mWebView.setWebViewClient(new WebViewClient() {
            public boolean shouldOverrideUrlLoading(WebView view, String url) {
                return false;
            }

            @Override
            public void onPageFinished(WebView view, String url) {
                isPageLoaded = true;
            }
        });
        getOkHttpClient()
                .newBuilder()
                .addInterceptor(new SessionHandler(this))
                .build()
                .newCall(new Request.Builder()
                        .url(getBaseUrl() + Const.VISITS_URL + "/" + visit.getVisitId() + "/invoice")
                        .header(PARAM_X_AUTH_TOKEN, getToken()).build())
                .enqueue(this);
    }

    private void setupToolBar() {
        setSupportActionBar(toolbar);
        if (getSupportActionBar() != null)
            getSupportActionBar().setTitle("طباعة تقرير");
        ToolbarUtils.changeToolbar(toolbar);
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.menu_visit_activity, menu);
        MenuItem item=menu.findItem(R.id.action_delete_visit);
        item.setVisible(false);
        return super.onCreateOptionsMenu(menu);
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        if (item.getItemId() == R.id.action_print) {
            if (isDataLoaded)
                if (isPageLoaded)
                    createWebPrintJob(mWebView);
            return true;
        }
        return super.onOptionsItemSelected(item);
    }


    private void createWebPrintJob(WebView webView) {
        PrintManager printManager = (PrintManager) getSystemService(Context.PRINT_SERVICE);

        // Get a print adapter instance
        PrintDocumentAdapter printAdapter = webView.createPrintDocumentAdapter();

        // Create a print job with name and adapter instance
        String jobName = getString(R.string.app_name) + " Document";
        PrintJob printJob = printManager.print(jobName, printAdapter,
                new PrintAttributes.Builder().build());
        Log.d(TAG, "createWebPrintJob: " + printJob.getInfo().toString());
    }

    @Override
    public void onFailure(Call call, IOException e) {
        runOnUiThread(new Runnable() {
            @Override
            public void run() {
                progressLayout.setVisibility(View.GONE);
            }
        });
    }

    @Override
    public void onResponse(Call call, final Response response) throws IOException {

        if (response.isSuccessful()) {
            isDataLoaded = true;
            downloadInvoceTask.executeOnExecutor(Executors.newSingleThreadExecutor(),response);

        }
    }
    public class DownloadInvoiceTask extends  AsyncTask<Response, Void, String> {
        @Override
        protected String doInBackground(Response... responses) {
            try {
                return responses[0].body().string();
            } catch (IOException e) {
                e.printStackTrace();
            }
            return null;
        }

        @Override
        protected void onPostExecute(String s) {
            super.onPostExecute(s);
            Log.d(TAG, "onPostExecute: " + s);
            progressLayout.setVisibility(View.GONE);
            mWebView.setVisibility(View.VISIBLE);
            mWebView.loadDataWithBaseURL(null, s, "text/HTML", "UTF-8", null);
        }
    }

    @Override
    protected void onStop() {
        super.onStop();
        if (downloadInvoceTask!=null )
            downloadInvoceTask.cancel(true);
    }
}