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【Java】 Android安卓加载大图片,防止内存溢出

作者:Suppender / 发布于2015/7/9/ 487

工具类,直接复制进去,可以直接调用;Android安卓加载大图片,防止内存溢出的工具类. 代码的来源是从官网找了,封装了分享一下,希望对你们有用.


	public class LoadBitmapUtils {
	
	 /**
	 * 直接调用这个方法,加载图片,就可以防止内存溢出,大家可以补充一些重载的方法哈
	 * @Title: ViewPagerT2
	 * @Description: TODO
	 * @param res
	 * @param resId
	 * @param reqWidth 缩小后的宽,单位dp
	 * @param reqHeight 缩小后的长,单位dp
	 * @return
	 */
	 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;
	 }
	}

	

	

	

	package com.xunfang.viewpagert;
	
	import android.content.res.Resources;
	import android.graphics.Bitmap;
	import android.graphics.BitmapFactory;
	
	public class LoadBitmapUtils {
	
	 /**
	 * 直接调用这个方法,加载图片,就可以防止内存溢出,大家可以补充一些重载的方法哈
	 * @Title: ViewPagerT2
	 * @Description: TODO
	 * @param res
	 * @param resId
	 * @param reqWidth 缩小后的宽,单位dp
	 * @param reqHeight 缩小后的长,单位dp
	 * @return
	 */
	 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;
	 }
	}

试试其它关键字

　Android　　安卓　　加载　　大图片　　内存溢出　

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