Android Open Source - AskTheUniverseAndroidApp Main Activity

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From Project

Back to project page AskTheUniverseAndroidApp.

License

The source code is released under:

MIT License

Java Source Code

package com.example.asktheuniverse;
// w  w  w .j a v  a2  s. com
import java.io.IOException;

import android.os.AsyncTask;
import android.os.Bundle;
import android.accounts.Account;
import android.accounts.AccountManager;
import android.app.Activity;
import android.app.ProgressDialog;
import android.content.Intent;
import android.util.Log;
import android.view.Menu;
import android.view.View;
import android.widget.Toast;


import com.google.android.gms.auth.GoogleAuthException;
import com.google.android.gms.auth.GoogleAuthUtil;
import com.google.android.gms.common.AccountPicker;
import com.google.api.client.googleapis.extensions.android.gms.auth.GoogleAccountCredential;

public class MainActivity extends Activity {

  private AuthorizationCheckTask mAuthTask;
  private Boolean authed = false;
  private String mEmailAccount = null;
  private Application app = null;
  ProgressDialog progress = null;
  
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    
    app = (Application) this.getApplicationContext();
    progress = new ProgressDialog(this);
    progress.setCancelable(false);
    progress.setTitle("Signing in");
    progress.setMessage("Please wait while signing in..");
    progress.show();
    
    AccountManager am = AccountManager.get(this);
      Account[] accounts = am.getAccountsByType(GoogleAuthUtil.GOOGLE_ACCOUNT_TYPE);
    new AuthorizationCheckTask().execute(accounts[0].name);
  }
  
  public void startListActivity(View v){
    if (authed == false){
      Toast t = Toast.makeText(this, "You are not authenticated, please try later", Toast.LENGTH_LONG);
        t.show();
      return;
    }
    
    Intent i = new Intent(this, com.example.asktheuniverse.ListQuestionsActivity.class);
    startActivity(i);
  }
  
  public void startAskQuestionActivity(View v){
    if (authed == false){
      Toast t = Toast.makeText(this, "You are not authenticated, please try later", Toast.LENGTH_LONG);
        t.show();
      return;
    }
    
    Intent i = new Intent(this, com.example.asktheuniverse.AskQuestionActivity.class);
    startActivity(i);
  }

  @Override
  public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.main, menu);
    return true;
  }
  
  class AuthorizationCheckTask extends AsyncTask<String, Integer, Boolean> {
      @Override
      protected Boolean doInBackground(String... emailAccounts) {

        String emailAccount = emailAccounts[0];
        // Ensure only one task is running at a time.
        mAuthTask = this;
        
        try {
          // If the application has the appropriate access then a token will be retrieved, otherwise
          // an error will be thrown.
          
          app.credential = GoogleAccountCredential.usingAudience(
              MainActivity.this, AppConstants.AUDIENCE);
          app.credential.setSelectedAccountName(emailAccount);

          String accessToken = app.credential.getToken();
          mEmailAccount = emailAccount;
          
          // Success.
          return true;
        } catch (GoogleAuthException unrecoverableException) {
          unrecoverableException.printStackTrace();
            return false;
        } catch (IOException ioException) {
          ioException.printStackTrace();
            return false;
        }
      }
      
      @Override
      protected void onProgressUpdate(Integer... stringIds) {
      }

      @Override
      protected void onPreExecute() {
        mAuthTask = this;
      }

      @Override
      protected void onPostExecute(Boolean success) {
        if (success) {
          authed = true;
          Toast t = Toast.makeText(MainActivity.this, "Signed in.", Toast.LENGTH_LONG);
          t.show();
        } else {
          authed = false;
          Toast t = Toast.makeText(MainActivity.this, "Failed to sign in, try again later", Toast.LENGTH_LONG);
          t.show();
        }
        progress.cancel();
        mAuthTask = null;
      }

      @Override
      protected void onCancelled() {
        progress.cancel();
        mAuthTask = null;
      }
    }


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

Java Source Code List

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