bitmap OOM的解决方案

package com.gdp2852.BitmapOOM_Solution; import java.io.BufferedInputStream; import java.io.File; import java.io.InputStream; import android.app.Activity; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.net.Uri; import android.os.Bundle; import android.os.Environment; import android.util.Log; import android.widget.ImageView; public class ACT_Solution3 extends Activity { String BaseStorePath = Environment.getExternalStorageDirectory() + File.separator + "photos" + File.separator; private ImageView imgView1, imgView2,imgView3; private Bitmap bmp1, bmp2,bmp3; protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.problem_happen); imgView1 = (ImageView) findViewById(R.id.img1); imgView2 = (ImageView) findViewById(R.id.img2); imgView3 = (ImageView) findViewById(R.id.img3); loadImage(); } private void loadImage() { bmp1 = getThumbnail(BaseStorePath + "img4.jpg"); imgView1.setImageBitmap(bmp1); bmp2 = getThumbnail(BaseStorePath + "img7.jpg",-1,800*600); imgView2.setImageBitmap(bmp2); bmp3 = getThumbnail(BaseStorePath + "img6.jpg"); Log.d("DEMO", "bmp3==null:"+(bmp3==null)); imgView3.setImageBitmap(bmp3); } private Bitmap getThumbnail(String imageFile) { return getThumbnail(imageFile, -1, 800*600); } private Bitmap getThumbnail(String imageFile, int minSideLength, int maxNumOfPixels) { BitmapFactory.Options opts = new BitmapFactory.Options(); opts.inJustDecodeBounds = true; BitmapFactory.decodeFile(imageFile, opts); opts.inSampleSize = computeSampleSize(opts, minSideLength, maxNumOfPixels); opts.inJustDecodeBounds = false; try { return BitmapFactory.decodeFile(imageFile, opts); } catch (OutOfMemoryError err) { } return null; } private static int computeSampleSize(BitmapFactory.Options options, int minSideLength, int maxNumOfPixels) { int initialSize = computeInitialSampleSize(options, minSideLength, maxNumOfPixels); int roundedSize; if (initialSize <= 8) { roundedSize = 1; while (roundedSize < initialSize) { roundedSize <<= 1; } } else { roundedSize = (initialSize + 7) / 8 * 8; } return roundedSize; } private static int computeInitialSampleSize(BitmapFactory.Options options, int minSideLength, int maxNumOfPixels) { double w = options.outWidth; double h = options.outHeight; int lowerBound = (maxNumOfPixels == -1) ? 1 : (int) Math.ceil(Math .sqrt(w * h / maxNumOfPixels)); int upperBound = (minSideLength == -1) ? 128 : (int) Math.min( Math.floor(w / minSideLength), Math.floor(h / minSideLength)); if (upperBound < lowerBound) { // return the larger one when there is no overlapping zone. return lowerBound; } if ((maxNumOfPixels == -1) && (minSideLength == -1)) { return 1; } else if (minSideLength == -1) { return lowerBound; } else { return upperBound; } } protected void onDestroy() { super.onDestroy(); if(bmp1 != null){ bmp1.recycle(); bmp1 = null; } if(bmp2 != null){ bmp2.recycle(); bmp2 = null; } if(bmp3 != null){ bmp3.recycle(); bmp3 = null; } } }