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