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Copyright (c) 2014, Impeccable Labs, LLC. All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions ar...
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package com.ideabag.playtunes.util; // www.j a v a 2 s.co m import java.lang.ref.WeakReference; import com.ideabag.playtunes.R; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.graphics.drawable.Drawable; import android.os.AsyncTask; import android.view.animation.AlphaAnimation; import android.view.animation.AnimationUtils; import android.widget.ImageView; public class BitmapWorkerTask extends AsyncTask<String, Void, Bitmap> { private final WeakReference<ImageView> imageViewReference; private String path; int mImageWidth; //private Context mContext; public BitmapWorkerTask( ImageView imageView, int destWidthPx ) { // Use a WeakReference to ensure the ImageView can be garbage collected imageViewReference = new WeakReference<ImageView>(imageView); mImageWidth = destWidthPx; //Context mContext = imageView.getContext(); //mContext.getResources().getDisplayMetrics().density // TODO: // When this is first called, the width is 0 // Creates bad album art on initial load //mContext = imageView.getContext(); } public BitmapWorkerTask( ImageView imageView ) { this( imageView, 0 ); } // Decode image in background. @Override protected Bitmap doInBackground(String... paths) { final BitmapFactory.Options options = new BitmapFactory.Options(); path = paths[0]; // First decode with inJustDecodeBounds=true to check dimensions Bitmap bmp = null; if ( !isCancelled() ) { if ( mImageWidth > 0 ) { options.inJustDecodeBounds = true; BitmapFactory.decodeFile( path, options ); int sample = calculateInSampleSize( options, mImageWidth, mImageWidth ); //android.util.Log.i( "BitmapWorkerTask", "Sample: " + sample + " desired width: " + mImageWidth ); // Calculate inSampleSize options.inSampleSize = sample; // Decode bitmap with inSampleSize set } options.inJustDecodeBounds = false; if ( !isCancelled() ) { try { bmp = BitmapFactory.decodeFile( path, options ); } catch( Throwable t ) { t.printStackTrace(); } } } return bmp; } // Once complete, see if ImageView is still around and set bitmap. @Override protected void onPostExecute( Bitmap bitmap ) { if ( isCancelled() ) { bitmap = null; } if ( imageViewReference != null && bitmap != null ) { final ImageView imageView = imageViewReference.get(); if ( imageView != null ) { AlphaAnimation fadeIn = ( AlphaAnimation ) AnimationUtils.loadAnimation( imageView.getContext(), R.anim.fadein ); imageView.setImageBitmap( bitmap ); imageView.startAnimation( fadeIn ); } } } private static BitmapWorkerTask getBitmapWorkerTask( ImageView imageView ) { if ( imageView != null ) { final Drawable drawable = imageView.getDrawable(); if ( drawable instanceof AsyncDrawable ) { final AsyncDrawable asyncDrawable = ( AsyncDrawable ) drawable; return asyncDrawable.getBitmapWorkerTask(); } } return null; } public static boolean cancelPotentialWork( String data, ImageView imageView ) { final BitmapWorkerTask bitmapWorkerTask = getBitmapWorkerTask( imageView ); if ( bitmapWorkerTask != null ) { final String bitmapData = bitmapWorkerTask.path; // If bitmapData is not yet set or it differs from the new data if ( bitmapData == null || bitmapData != data ) { // Cancel previous task bitmapWorkerTask.cancel( true ); } else { // The same work is already in progress return false; } } // No task associated with the ImageView, or an existing task was cancelled return true; } // TODO: // Rather than scaling by factors of 2, scale by factors of the device's screen density public static int calculateInSampleSize( BitmapFactory.Options options, int reqWidth, int reqHeight) { // Raw height and width of image final int height = options.outHeight; final int width = options.outWidth; int inSampleSize = 1; if (height > reqHeight || width > reqWidth) { final int halfHeight = height / 2; final int halfWidth = width / 2; // Calculate the largest inSampleSize value that is a power of 2 and keeps both // height and width larger than the requested height and width. while ((halfHeight / inSampleSize) > reqHeight && (halfWidth / inSampleSize) > reqWidth) { inSampleSize *= 2; } } return inSampleSize; } /* public static Bitmap decodeSampledBitmapFromResource(Resources res, int resId, int reqWidth, int reqHeight) { // First decode with inJustDecodeBounds=true to check dimensions final BitmapFactory.Options options = new BitmapFactory.Options(); options.inJustDecodeBounds = true; BitmapFactory.decodeResource(res, resId, options); // Calculate inSampleSize options.inSampleSize = calculateInSampleSize(options, reqWidth, reqHeight); // Decode bitmap with inSampleSize set options.inJustDecodeBounds = false; return BitmapFactory.decodeResource(res, resId, options); } public static int calculateInSampleSize( BitmapFactory.Options options, int reqWidth, int reqHeight) { // Raw height and width of image final int height = options.outHeight; final int width = options.outWidth; int inSampleSize = 1; if (height > reqHeight || width > reqWidth) { final int halfHeight = height / 2; final int halfWidth = width / 2; // Calculate the largest inSampleSize value that is a power of 2 and keeps both // height and width larger than the requested height and width. while ((halfHeight / inSampleSize) > reqHeight && (halfWidth / inSampleSize) > reqWidth) { inSampleSize *= 2; } } return inSampleSize; } */ /* public void loadBitmap(int resId, ImageView imageView) { if (cancelPotentialWork(resId, imageView)) { final BitmapWorkerTask task = new BitmapWorkerTask(imageView); final AsyncDrawable asyncDrawable = new AsyncDrawable(getResources(), mPlaceHolderBitmap, task); imageView.setImageDrawable(asyncDrawable); task.execute(resId); } } */ }