Android Open Source - android-screenshot-gallery Picture Activity

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Back to project page android-screenshot-gallery.

License

The source code is released under:

Apache License

Java Source Code

package com.demondevelopers.screenshotgallery;
//www.  j  ava 2 s  . c o  m
import android.annotation.TargetApi;
import android.content.ContentValues;
import android.content.Context;
import android.content.Intent;
import android.database.Cursor;
import android.database.DatabaseUtils;
import android.graphics.Bitmap;
import android.os.Build;
import android.os.Bundle;
import android.os.Handler;
import android.os.Looper;
import android.provider.MediaStore.Images;
import android.provider.MediaStore.Images.ImageColumns;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentStatePagerAdapter;
import android.support.v4.app.LoaderManager.LoaderCallbacks;
import android.support.v4.content.CursorLoader;
import android.support.v4.content.Loader;
import android.support.v4.view.ViewPager;
import android.text.format.DateFormat;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;


public class PictureActivity extends BaseActivity implements LoaderCallbacks<Cursor>, 
  PictureFragment.OnPictureLoaded, PictureFragment.ToggleUIState
{
  public static final String EXTRA_POSITION  = "extraPosition";
  
  private Handler mHandler = new Handler(Looper.getMainLooper());
  private ViewPager mViewPager;
  private PicturePagerAdapter mAdapter;
  private ImageView mHolder;
  private int mPosition;
  
  
  public static Intent createIntent(Context context, int position)
  {
    return new Intent(context, PictureActivity.class)
      .putExtra(EXTRA_POSITION, position);
  }
  
  @Override
  protected void onCreate(Bundle savedInstanceState)
  {
    super.onCreate(savedInstanceState);
    
    ensureFullscreenLayout();
    setContentView(R.layout.activity_picture);
    
    mAdapter   = new PicturePagerAdapter(getSupportFragmentManager());
    mViewPager = (ViewPager)findViewById(R.id.view_pager);
    mViewPager.setAdapter(mAdapter);
    mViewPager.setOffscreenPageLimit(3);
    
    mHolder = (ImageView)findViewById(R.id.holder);
    Bitmap thumbnail = getApp().getZoomImage();
    if(thumbnail != null){
      mHolder.setImageBitmap(thumbnail);
      getApp().putZoomImage(null);
    }
    else{
      mHolder.setVisibility(View.GONE);
    }
    if(savedInstanceState != null){
      mPosition = savedInstanceState.getInt(EXTRA_POSITION);
    }
    else{
      mPosition = getIntent().getIntExtra(EXTRA_POSITION, 0);
    }
    getSupportLoaderManager().initLoader(0, null, this);
  }
  
  @Override
  public void onPictureLoaded(boolean successful, String filePath)
  {
    mHolder.setVisibility(View.GONE);
    mHolder.setImageDrawable(null);
  }
  
  @TargetApi(Build.VERSION_CODES.KITKAT)
  @Override
  public boolean toggleUIState()
  {
    View v = getWindow().getDecorView();
    int flags = 0;
    if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN){
      flags |= View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN;
    }
    int current = v.getSystemUiVisibility();
    if((current & View.SYSTEM_UI_FLAG_LOW_PROFILE) != 0){
      v.setSystemUiVisibility(flags);
    }
    else{
      flags |= View.SYSTEM_UI_FLAG_LOW_PROFILE | 
        View.SYSTEM_UI_FLAG_HIDE_NAVIGATION;
      if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN){
        flags |= View.SYSTEM_UI_FLAG_FULLSCREEN;
      }
      if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT){
        flags |= View.SYSTEM_UI_FLAG_IMMERSIVE;
      }
      v.setSystemUiVisibility(flags);
    }
    return true;
  }
  
  @Override
  protected void onSaveInstanceState(Bundle outState)
  {
    super.onSaveInstanceState(outState);
    outState.putInt(EXTRA_POSITION, mViewPager.getCurrentItem());
  }
  
  @Override
  protected void onRestoreInstanceState(Bundle savedInstanceState)
  {
    super.onRestoreInstanceState(savedInstanceState);
    mPosition = savedInstanceState.getInt(EXTRA_POSITION);
  }
  
  @Override
  public Loader<Cursor> onCreateLoader(int id, Bundle args)
  {
    return new CursorLoader(this, Images.Media.EXTERNAL_CONTENT_URI,
      null, null, null, Images.Media.DEFAULT_SORT_ORDER);
  }
  
  @Override
  public void onLoadFinished(Loader<Cursor> loader, Cursor data)
  {
    mAdapter.changeCursor(data);
    mViewPager.setCurrentItem(mPosition, false);
  }
  
  @Override
  public void onLoaderReset(Loader<Cursor> loader)
  {
    //
  }
  
  
  private class PicturePagerAdapter extends FragmentStatePagerAdapter
  {
    private Cursor mCursor;
    
    
    public PicturePagerAdapter(FragmentManager fm)
    {
      super(fm);
    }
    
    public void changeCursor(Cursor newCursor)
    {
      if(newCursor == mCursor){
        return;
      }
      Cursor oldCursor = mCursor;
      mCursor = newCursor;
      if(oldCursor != null){
        oldCursor.close();
      }
      notifyDataSetChanged();
    }
    
    @Override
    public Fragment getItem(int position)
    {
      if(!mCursor.moveToPosition(position)){
        throw new IllegalArgumentException("position " + position + " not in cursor");
      }
      ContentValues values = new ContentValues();
      DatabaseUtils.cursorRowToContentValues(mCursor, values);
      return PictureFragment.newInstance(values);
    }
    
    @TargetApi(Build.VERSION_CODES.JELLY_BEAN)
    @Override
    public void setPrimaryItem(ViewGroup container, final int position, Object object)
    {
      super.setPrimaryItem(container, position, object);
      if(mCursor == null){
        return;
      }
      if(!mCursor.moveToPosition(position)){
        throw new IllegalArgumentException("position " + position + " not in cursor");
      }
      final String title = mCursor.getString(mCursor.getColumnIndex(ImageColumns.TITLE));
      StringBuilder sb = new StringBuilder(128);
      if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN){
        sb.append(mCursor.getInt(mCursor.getColumnIndex(ImageColumns.WIDTH)));
        sb.append('x');
        sb.append(mCursor.getInt(mCursor.getColumnIndex(ImageColumns.HEIGHT)));
        sb.append(", ");
      }
      sb.append(ImageUtils.humanReadableByteCount(
        mCursor.getLong(mCursor.getColumnIndex(ImageColumns.SIZE)), false));
      sb.append(", ");
      sb.append(DateFormat.getDateFormat(container.getContext())
        .format(mCursor.getLong(mCursor.getColumnIndex(ImageColumns.DATE_TAKEN))));
      final String subtitle = sb.toString();
      mHandler.post(new Runnable(){
        @Override
        public void run()
        {
          getActionBar().setTitle(title);
          getActionBar().setSubtitle(subtitle);
        }
      });
    }
    
    @Override
    public int getCount()
    {
      return (mCursor != null) ? mCursor.getCount() : 0;
    }
  }
}

Java Source Code List

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