QRScanner/glass/src/main/java/cz/cvut/fel/dce/qrscanner/pdfviewer/PdfViewActivity.java

   1 package cz.cvut.fel.dce.qrscanner.pdfviewer;
   2
   3 import android.app.Activity;
   4 import android.content.Context;
   5 import android.content.Intent;
   6 import android.hardware.Sensor;
   7 import android.hardware.SensorEvent;
   8 import android.hardware.SensorEventListener;
   9 import android.hardware.SensorManager;
  10 import android.media.AudioManager;
  11 import android.os.AsyncTask;
  12 import android.os.Bundle;
  13 import android.util.Log;
  14 import android.view.KeyEvent;
  15 import android.view.Menu;
  16 import android.view.MenuItem;
  17 import android.view.MotionEvent;
  18 import android.view.View;
  19 import android.view.ViewTreeObserver;
  20 import android.view.WindowManager;
  21 import android.widget.FrameLayout;
  22 import android.widget.RelativeLayout;
  23 import android.widget.TextView;
  24 import android.widget.Toast;
  25
  26 import com.google.android.glass.media.Sounds;
  27
  28 import java.io.File;
  29
  30 import cz.cvut.fel.dce.qrscanner.R;
  31
  32 public class PdfViewActivity extends Activity implements ViewTreeObserver.OnGlobalLayoutListener, PdfPageView.SceneChange, SensorEventListener {
  33
  34         enum ViewStates {
  35                 SCROLLING,
  36                 VIEWING
  37         };
  38
  39         public static final String TAG = "PdfViewActivity";
  40
  41         private FrameLayout mPdfImageContainer;
  42         private TextView mCurrentPageNumber;
  43         private TextView mLastPageNumber;
  44         private TextView mViewerStateText;
  45         private TextView mZoomValue;
  46         private ViewTreeObserver mPreviewImgObserver;
  47         private String mFilePath;
  48         private PdfPageView mPdfView;
  49         private Boolean mPdfLoaded = false;
  50         private SensorManager mSensorManager;
  51         private ViewStates mViewStates;
  52         private RelativeLayout mProgressContainer;
  53
  54         /**
  55          * Start position of the gesture on touchpad
  56          */
  57         private float startX;
  58
  59         @Override
  60         protected void onCreate(Bundle savedInstanceState) {
  61                 super.onCreate(savedInstanceState);
  62                 getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
  63                 mSensorManager = (SensorManager) getSystemService(Context.SENSOR_SERVICE);
  64                 setContentView(R.layout.activity_pdf_view);
  65                 mPdfImageContainer = (FrameLayout) findViewById(R.id.pdf_view_container);
  66                 mCurrentPageNumber = (TextView) findViewById(R.id.page_number);
  67                 mLastPageNumber = (TextView) findViewById(R.id.total_pages_num);
  68                 mViewerStateText = (TextView) findViewById(R.id.pdf_viewer_state);
  69                 mZoomValue = (TextView) findViewById(R.id.zoom_value);
  70                 mViewStates = ViewStates.SCROLLING;
  71                 mProgressContainer = (RelativeLayout) findViewById(R.id.progress_container);
  72
  73                 if (mPdfImageContainer != null) {
  74                         mPreviewImgObserver = mPdfImageContainer.getViewTreeObserver();
  75                         Log.i(TAG, "Registering mPreviewImgObserver OnGlobalLayoutListener.");
  76                         mPreviewImgObserver.addOnGlobalLayoutListener(this);
  77                 }
  78                 else {
  79                         Log.e(TAG, "ImageView for preview image could not be found in the resources.");
  80                         mPreviewImgObserver = null;
  81                 }
  82
  83                 Intent intent = getIntent();
  84                 mFilePath = intent.getStringExtra("FILE_PATH");
  85
  86                 if (mFilePath != null) {
  87                         Log.i(TAG, "File path: " + mFilePath);
  88                         File rootPath = new File(mFilePath);
  89                         if (!rootPath.exists()) {
  90                                 Toast toast = Toast.makeText(getApplicationContext(), "Document not found", Toast.LENGTH_LONG);
  91                                 toast.show();
  92                                 finish();
  93                         }
  94                 }
  95                 else {
  96                         Log.i(TAG, "No file path received");
  97                         finish();
  98                 }
  99         }
 100
 101         public void onResume() {
 102                 mSensorManager.registerListener(this, mSensorManager.getDefaultSensor(Sensor.TYPE_GYROSCOPE), SensorManager.SENSOR_DELAY_NORMAL);
 103                 super.onResume();
 104         }
 105
 106         @Override
 107         protected void onPause() {
 108                 super.onPause();
 109                 mSensorManager.unregisterListener(this);
 110         }
 111
 112         @Override
 113         protected void onDestroy() {
 114                 super.onDestroy();
 115                 if (mPreviewImgObserver != null && mPreviewImgObserver.isAlive()) {
 116                         mPreviewImgObserver.removeOnGlobalLayoutListener(this);
 117                 }
 118                 getWindow().clearFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
 119         }
 120
 121
 122
 123         @Override
 124         public boolean onCreateOptionsMenu(Menu menu) {
 125                 // Inflate the menu; this adds items to the action bar if it is present.
 126                 getMenuInflater().inflate(R.menu.menu_pdf_view, menu);
 127                 return true;
 128         }
 129
 130         @Override
 131         public boolean onOptionsItemSelected(MenuItem item) {
 132                 // Handle action bar item clicks here. The action bar will
 133                 // automatically handle clicks on the Home/Up button, so long
 134                 // as you specify a parent activity in AndroidManifest.xml.
 135                 int id = item.getItemId();
 136
 137                 //noinspection SimplifiableIfStatement
 138                 if (id == R.id.action_settings) {
 139                         return true;
 140                 }
 141
 142                 return super.onOptionsItemSelected(item);
 143         }
 144
 145         @Override
 146         public void onGlobalLayout() {
 147                 if (mPdfLoaded) {
 148                         Log.d(TAG, "PDF file already loaded.");
 149                         return;
 150                 }
 151                 try {
 152                         String picturePath = mFilePath;
 153                         Log.i(TAG, "Path to component files: " + picturePath);
 154                         mPdfView = new PdfPageView(getApplicationContext(), picturePath);
 155                         mCurrentPageNumber.setText(Integer.toString(mPdfView.getActualPage()+1));
 156                         mLastPageNumber.setText(Integer.toString(mPdfView.getLastPage() + 1));
 157                         mPdfView.setListener(this);
 158                         mPdfView.setPage(0);
 159                         new LoadPageTask().execute();
 160
 161
 162                         if (mPdfImageContainer != null) {
 163                                 mPdfLoaded = true;
 164                         }
 165                         else {
 166                                 Log.e(TAG, "Could not find container for PdfPageView.");
 167                                 finish();
 168                         }
 169                 } catch (Exception e) {
 170                         Toast toast = Toast.makeText(getApplicationContext(), "Component preview could not be loaded.", Toast.LENGTH_LONG);
 171                         toast.show();
 172                         e.printStackTrace();
 173                 }
 174         }
 175
 176         @Override
 177         public boolean onGenericMotionEvent(MotionEvent event) {
 178                 if (mViewStates == ViewStates.SCROLLING) {
 179                         /*
 180                           Zoom ratio gained during one gesture on touchpad
 181                         */
 182                         float dzoom;
 183                         if (event.getAction() == MotionEvent.ACTION_DOWN) {
 184                                 startX = event.getRawX();
 185                                 return false;
 186                         }
 187                         if (event.getAction() == MotionEvent.ACTION_MOVE) {
 188                                 dzoom = event.getRawX() - startX;
 189                                 zoomPage(dzoom / 1000f);
 190                                 startX = event.getRawX();
 191                                 return false;
 192                         }
 193                 }
 194                 return super.onGenericMotionEvent(event);
 195         }
 196
 197         @Override
 198         public boolean onKeyDown(int keyCode, KeyEvent event) {
 199                 if (keyCode == KeyEvent.KEYCODE_DPAD_CENTER) {
 200                         AudioManager audio = (AudioManager) getSystemService(Context.AUDIO_SERVICE);
 201                         audio.playSoundEffect(Sounds.TAP);
 202                         switchState();
 203                 }
 204                 return super.onKeyDown(keyCode, event);
 205         }
 206
 207         private void switchState() {
 208                 if (mViewStates == ViewStates.SCROLLING) {
 209                         mViewStates = ViewStates.VIEWING;
 210                         mViewerStateText.setText(getText(R.string.state_viewing));
 211                 }
 212                 else {
 213                         mViewStates = ViewStates.SCROLLING;
 214                         mViewerStateText.setText(getText(R.string.state_scrolling));
 215
 216                 }
 217         }
 218
 219         @Override
 220         public void onAccuracyChanged(Sensor sensor, int accuracy) {
 221
 222         }
 223
 224         @Override
 225         public void onSensorChanged(SensorEvent event) {
 226                 if (event.sensor.getType() == Sensor.TYPE_GYROSCOPE) {
 227                         float dx = event.values[1]*12;
 228                         float dy = event.values[0]*12;
 229                         if (mPdfView != null) {
 230                                 if (mViewStates == ViewStates.SCROLLING) {
 231                                         mPdfView.move(-dx, -dy);
 232                                 }
 233                         }
 234                 }
 235         }
 236
 237         @Override
 238         public void onViewChanged(PdfPageView source) {
 239                 if (mPdfView != null) {
 240                         mPdfView.invalidate();
 241                 }
 242         }
 243
 244         @Override
 245         public void onPageLoaded(PdfPageView source) {
 246
 247         }
 248
 249         private void zoomPage(float deltaZoom) {
 250                 mPdfView.zoom(deltaZoom);
 251                 mZoomValue.setText(Integer.toString(Math.round(mPdfView.getZoomRatio() * 100)));
 252         }
 253
 254         private class LoadPageTask extends AsyncTask<Void, Void, Void> {
 255
 256                 @Override
 257                 protected Void doInBackground(Void[] objects) {
 258                         mPdfView.loadPage();
 259                         return null;
 260                 }
 261
 262                 @Override
 263                 protected void onPreExecute() {
 264                         super.onPreExecute();
 265                         Log.d(TAG, "Starting loading of the PDF page asynchronously.");
 266                         mProgressContainer.setVisibility(View.VISIBLE);
 267                 }
 268
 269                 @Override
 270                 protected void onPostExecute(Void aVoid) {
 271                         super.onPostExecute(aVoid);
 272                         mProgressContainer.setVisibility(View.INVISIBLE);
 273                         switchState();
 274                         mPdfImageContainer.addView(mPdfView);
 275                         zoomPage(0.0f); // just for update the zoom value indicator
 276                         Log.d(TAG, "PDF page loaded.");
 277                 }
 278         }
 279 }