Android Open Source - ivotingverification Main Activity

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License

The source code is released under:
GNU General Public License
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Java Source Code

/**
 * Copyright (C) 2013 Eesti Vabariigi Valimiskomisjon 
 * (Estonian National Electoral Committee), www.vvk.ee
 *//from   ww  w.  j av  a2 s.  c om
 * Written in 2013 by AS Finestmedia, www.finestmedia.ee
 * 
 * Vote-verification application for Estonian Internet voting system
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 **/
 
package ee.vvk.ivotingverification;

import java.io.File;
import java.io.IOException;

import org.apache.http.HttpResponse;

import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.content.pm.ApplicationInfo;
import android.graphics.Color;
import android.graphics.drawable.GradientDrawable;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.Handler;
import android.util.Log;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.Window;
import android.view.WindowManager;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.TextView;
import ee.vvk.ivotingverification.dialog.LoadingSpinner;
import ee.vvk.ivotingverification.qr.CameraManager;
import ee.vvk.ivotingverification.qr.CaptureActivityHandler;
import ee.vvk.ivotingverification.qr.InactivityTimer;
import ee.vvk.ivotingverification.util.C;
import ee.vvk.ivotingverification.util.HttpRequest;
import ee.vvk.ivotingverification.util.JSONParser;
import ee.vvk.ivotingverification.util.Util;

/**
 * Main activity. The first screen.
 * 
 * @version 21.05.2013
 */
public class MainActivity extends Activity implements SurfaceHolder.Callback {

  private static final String TAG = MainActivity.class.getSimpleName();

  private CameraManager cameraManager;
  private CaptureActivityHandler handler;
  private boolean hasSurface;
  private InactivityTimer inactivityTimer;
  private SurfaceView surfaceView;
  private LoadingSpinner mLoadingSpinner;

  private Button buttonMore;
  private Button buttonNext;

  private HttpResponse response;

  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    requestWindowFeature(Window.FEATURE_NO_TITLE);
    getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
        WindowManager.LayoutParams.FLAG_FULLSCREEN);
    Util.DEBUGGABLE = (0 != (getApplicationInfo().flags &= ApplicationInfo.FLAG_DEBUGGABLE));

    if (getIntent().getBooleanExtra(Util.EXIT, false)) {
      finish();
    }

    hasSurface = false;
    if (this != null)
      inactivityTimer = new InactivityTimer(this);

    setContentView(R.layout.main_activity);

    LinearLayout linearLayout = (LinearLayout) findViewById(R.id.target_window);
    GradientDrawable bgShape = (GradientDrawable) linearLayout
        .getBackground();
    bgShape.setColor(Color.GRAY);

    linearLayout = (LinearLayout) findViewById(R.id.target_window_error_shadow);

    ConnectivityManager connMgr = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
    NetworkInfo networkInfo = connMgr.getActiveNetworkInfo();
    if (networkInfo != null && networkInfo.isConnected()) {
      C.configURL = Util.readRawTextFile(this.getApplicationContext(),
          R.raw.config).trim();
      urlConnConnect();
    } else {
      Util.startErrorIntent(MainActivity.this, C.noNetworkMessage, false);
    }

    LinearLayout frameBg = (LinearLayout) findViewById(R.id.frame_bg);
    frameBg.setBackgroundColor(Util
        .generateHexColorValue(C.frameBackground));

    buttonNext = (Button) findViewById(R.id.btn_next);
    buttonNext.setText(C.btnNext);
    buttonNext.setTextColor(Util.generateHexColorValue(C.btnForeground));
    GradientDrawable bgNextShape = (GradientDrawable) buttonNext
        .getBackground();
    bgNextShape.setColor(Util.generateHexColorValue(C.btnBackground));

    buttonNext.setOnClickListener(new OnClickListener() {
      @Override
      public void onClick(View v) {
        clickNextButton(v);
      }
    });

    buttonMore = (Button) findViewById(R.id.btn_more);
    buttonMore.setText(C.btnMore);
    buttonMore.setTextColor(Util.generateHexColorValue(C.btnForeground));
    GradientDrawable bgMoreShape = (GradientDrawable) buttonMore
        .getBackground();
    bgMoreShape.setColor(Util.generateHexColorValue(C.btnBackground));

    buttonMore.setOnClickListener(new OnClickListener() {
      @Override
      public void onClick(View v) {
        clickMoreButton(v);
      }
    });
  }

  public Handler getHandler() {
    return handler;
  }

  public CameraManager getCameraManager() {
    return cameraManager;
  }

  @Override
  public void onResume() {
    super.onResume();

    if (this == null)
      return;

    cameraManager = new CameraManager(this);

    if (cameraManager == null) {
      Intent i = this.getIntent();
      this.finish();
      startActivity(i);
      return;
    }

    handler = null;

    surfaceView = (SurfaceView) this.findViewById(R.id.surface);
    SurfaceHolder surfaceHolder = surfaceView.getHolder();
    if (hasSurface) {
      initCamera(surfaceHolder, false);
    } else {
      surfaceHolder.addCallback(this);
      surfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
    }

    inactivityTimer.onResume();
  }

  public void clickNextButton(View view) {
    Intent QRCodeDecoder = new Intent(this, QRScannerActivity.class);
    startActivityForResult(QRCodeDecoder, 1);
  }

  public void clickMoreButton(View view) {
    Intent helpActivity = new Intent(this, HelpActivity.class);
    startActivity(helpActivity);
  }

  @Override
  public void onActivityResult(int requestCode, int resultCode, Intent intent) {
    if (requestCode == 1) {
      if (resultCode == RESULT_OK) {
        String contents = intent.getStringExtra(Util.RESULT);
        if (Util.DEBUGGABLE) {
          Log.d(TAG, contents);
        }
        try {
          if (contents != null && contents.getBytes().length <= 391
              && contents.substring(40, 41).equals("\n")) {
            startVoteDownloadActvity(contents);
          } else {
            Util.startErrorIntent(MainActivity.this,
                C.problemQrCodeMessage, true);
          }
        } catch (Exception e) {
          Util.startErrorIntent(MainActivity.this,
              C.problemQrCodeMessage, true);
        }
      }
      if (resultCode == RESULT_CANCELED) {
        finish();
        Intent intentMain = new Intent(getApplicationContext(),
            MainActivity.class);
        startActivity(intentMain);
      }
    }
  }

  private void startVoteDownloadActvity(String contents) {
    Intent next_intent = new Intent(this, VoteDownloadActivity.class);
    next_intent.putExtra(Util.EXTRA_MESSAGE, contents);
    startActivity(next_intent);
  }

  @Override
  protected void onDestroy() {
    super.onDestroy();
    Util.stopSpinner(mLoadingSpinner);
    try {
      trimCache(this);
    } catch (Exception e) {
    }
  }

  public static void trimCache(Context context) {
    try {
      File dir = context.getCacheDir();
      if (dir != null && dir.isDirectory()) {
        deleteDir(dir);
      }
    } catch (Exception e) {
    }
  }

  public static boolean deleteDir(File dir) {
    if (dir != null && dir.isDirectory()) {
      String[] children = dir.list();
      for (int i = 0; i < children.length; i++) {
        boolean success = deleteDir(new File(dir, children[i]));
        if (!success) {
          return false;
        }
      }
    }
    return dir.delete();
  }

  @Override
  public void onPause() {
    if (handler != null) {
      handler.quitSynchronously();
      handler = null;
    }
    inactivityTimer.onPause();
    cameraManager.closeDriver();
    if (!hasSurface) {
      SurfaceView surfaceView = (SurfaceView) this
          .findViewById(R.id.surface);
      if (surfaceView != null) {
        SurfaceHolder surfaceHolder = surfaceView.getHolder();
        surfaceHolder.removeCallback(this);
      }
    }
    super.onPause();
  }

  private void initCamera(SurfaceHolder surfaceHolder, boolean flashlight) {
    try {
      cameraManager.openDriver(surfaceHolder, flashlight);
      if (handler == null) {
        cameraManager.startPreview();
      }
    } catch (IOException ioe) {
      if (Util.DEBUGGABLE) {
        Log.e(TAG, "Error:" + ioe);
      }
    } catch (RuntimeException e) {
      if (Util.DEBUGGABLE) {
        Log.e(TAG, "Unexpected error initializing camera", e);
      }
    }
  }

  @Override
  public void surfaceCreated(SurfaceHolder holder) {
    if (holder == null) {
      if (Util.DEBUGGABLE) {
        Log.e(TAG,
            "*** WARNING *** surfaceCreated() gave us a null surface!");
      }
    }
    if (!hasSurface) {
      hasSurface = true;
      initCamera(holder, false);
    }
  }

  @Override
  public void surfaceDestroyed(SurfaceHolder holder) {
    hasSurface = false;
  }

  @Override
  public void surfaceChanged(SurfaceHolder holder, int format, int width,
      int height) {

  }

  private void initMainWindow() {

    LinearLayout linearLayout = (LinearLayout) findViewById(R.id.target_window);
    GradientDrawable bgShape = (GradientDrawable) linearLayout
        .getBackground();
    bgShape.setColor(Util.generateHexColorValue(C.mainWindow));

    linearLayout = (LinearLayout) findViewById(R.id.target_window_shadow);
    GradientDrawable bgShapeShadow = (GradientDrawable) linearLayout
        .getBackground();
    bgShapeShadow.setColor(Util.generateHexColorValue(C.mainWindowShadow));

    LinearLayout linearLayoutShadow = (LinearLayout) findViewById(R.id.window_shadow);
    linearLayoutShadow.setVisibility(View.VISIBLE);

    TextView textView = (TextView) findViewById(R.id.text_message);
    textView.setTypeface(C.typeFace);
    textView.setText(C.welcomeMessage);
    textView.setVisibility(View.VISIBLE);
    textView.setTextColor(Util
        .generateHexColorValue(C.mainWindowForeground));

    buttonMore.setText(C.btnMore);
    buttonMore.setVisibility(View.VISIBLE);
    buttonMore.setTypeface(C.typeFace);
    if (C.appURL.length() > 0) {
      buttonNext.setText(C.btnNext);
      buttonNext.setVisibility(View.VISIBLE);
      buttonNext.setTypeface(C.typeFace);
    }
    ImageView frameImage = (ImageView) findViewById(R.id.frame_image);
    frameImage.setVisibility(View.GONE);
  }

  abstract class GetHtmlTask extends AsyncTask<Void, Void, String> {

    @Override
    protected void onPreExecute() {
      mLoadingSpinner = Util.startSpinner(MainActivity.this, true);
    }

    @Override
    protected void onPostExecute(String result) {
      if (Util.DEBUGGABLE) {
        Log.d(TAG, result);
      }
      try {
        try {
          new JSONParser(result);
        } catch (Exception e) {
          onDestroy();
          Util.startErrorIntent(MainActivity.this,
              C.badServerResponseMessage, true);
          if (Util.DEBUGGABLE) {
            Log.e(TAG, e.getMessage());
          }
        }
        Util.stopSpinner(mLoadingSpinner);
        initMainWindow();
      } catch (Exception e) {
        if (Util.DEBUGGABLE) {
          Log.e(TAG, e.getMessage());
        }
      }
    }
  }

  private void urlConnConnect() {
    new GetHtmlTask() {

      @Override
      protected String doInBackground(Void... arg0) {
        try {
          response = new HttpRequest(MainActivity.this).get(
              C.configURL, null);
        } catch (Exception e) {
          if (Util.DEBUGGABLE) {
            Log.e(TAG, "Tehniline viga: " + e.getMessage(), e);
          }
          return null;
        }
        try {
          if (response == null) {
            return null;
          } else {
            return Util.readLines(
                response.getEntity().getContent(),
                Util.ENCODING);
          }
        } catch (IllegalStateException e) {
          if (Util.DEBUGGABLE) {
            Log.e(TAG, "Tehniline viga: " + e.getMessage(), e);
          }
          Util.startErrorIntent(MainActivity.this,
              C.badServerResponseMessage, true);

        } catch (IOException e) {
          if (Util.DEBUGGABLE) {
            Log.e(TAG, "Tehniline viga: " + e.getMessage(), e);
          }
          Util.startErrorIntent(MainActivity.this,
              C.badServerResponseMessage, true);
        }
        ;
        return null;
      }
    }.execute();
  }
}
Java Source Code List
