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