今天在网上查找了下相关的资料，确实很少这方面的，不过也找到了一篇，根据这篇也做了相关测试
发现除了getResources().getDrawable(R.drawable.ic_launcher)这个方法有绝对优势外，此方法可以加载图片到1000张，
array2[i] = BitmapFactory.decodeFile(iconPath);//max 222
array[i] = Drawable.createFromPath(iconPath);//max 221
array[i] = BitmapDrawable.createFromPath(iconPath);//max 221
读取文件的方法Drawable和Bitmap都差不多，都是只能到200张左右
用流的方法读取结果，
array[i] = BitmapDrawable.createFromStream(
// new FileInputStream(iconPath), iconPath);//max 111
// array2[i] = BitmapFactory.decodeStream(
// new FileInputStream(iconPath));//max 221 ;
我测试的代码如下
package com.lanlong.test;
import java.io.File;
import java.io.FileInputStream;
import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Matrix;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.os.Bundle;
import android.os.Environment;
import android.util.Log;
public class AndrodTestActivity extends Activity {
int number = 1000;
Drawable[] array;
Bitmap [] array2;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
String iconPath = Environment.getExternalStorageDirectory()
+"/vpn/Bafangtong/image/weixin.png";
array = new Drawable[number];//BitmapDrawable 一样
array2 = new Bitmap[number];
File mfile = new File(iconPath);
Log.i("","mfile.exists() = "+mfile.exists());
for(int i = 0; i < number; i++)
{
Log.e("", "测试第" + (i+1) + "张图片");
// array[i] = getResources().getDrawable(R.drawable.ic_launcher);//1000 ok
// array2[i] = BitmapFactory.decodeFile(iconPath);//max 222
// zoomImg(array2[i], 800, 480);
// array[i] = Drawable.createFromPath(iconPath);//max 221
array[i] = BitmapDrawable.createFromPath(iconPath);//max 221
try {
// array[i] = Drawable.createFromStream(
// new FileInputStream(iconPath), iconPath);//max 111
// array[i] = BitmapDrawable.createFromStream(
// new FileInputStream(iconPath), iconPath);//max 111
// array2[i] = BitmapFactory.decodeStream(
// new FileInputStream(iconPath));//max 221 ;
Log.i("", "array["+i+"] = "+array[i]);
} catch (Exception e) {
// TODO: handle exception
}
}
}
public Bitmap zoomImg(Bitmap bm, int newWidth ,int newHeight){
// 获得图片的宽高
int width = bm.getWidth();
int height = bm.getHeight();
// 计算缩放比例
float scaleWidth = ((float) newWidth) / width;
float scaleHeight = ((float) newHeight) / height;
// 取得想要缩放的matrix参数
Matrix matrix = new Matrix();
matrix.postScale(scaleWidth, scaleHeight);
// 得到新的图片
Bitmap newbm = Bitmap.createBitmap(bm, 0, 0, width, height, matrix, true);
return newbm;
}
}
日志打印信息
08-28 10:15:27.009: E/(11960): 测试第211张图片
08-28 10:15:27.024: E/(11960): 测试第212张图片
08-28 10:15:27.034: E/(11960): 测试第213张图片
08-28 10:15:27.049: E/(11960): 测试第214张图片
08-28 10:15:27.064: E/(11960): 测试第215张图片
08-28 10:15:27.074: E/(11960): 测试第216张图片
08-28 10:15:27.104: E/(11960): 测试第217张图片
08-28 10:15:27.139: E/(11960): 测试第218张图片
08-28 10:15:27.159: E/(11960): 测试第219张图片
08-28 10:15:27.174: E/(11960): 测试第220张图片
08-28 10:15:27.189: E/(11960): 测试第221张图片
08-28 10:15:27.209: E/(11960): 测试第222张图片
08-28 10:15:27.249: I/dalvikvm-heap(11960): Clamp target GC heap from 70.389MB to 64.000MB
08-28 10:15:27.249: I/dalvikvm-heap(11960): Forcing collection of SoftReferences for 281616-byte allocation
08-28 10:15:27.314: I/dalvikvm-heap(11960): Clamp target GC heap from 70.381MB to 64.000MB
08-28 10:15:27.314: E/dalvikvm-heap(11960): Out of memory on a 281616-byte allocation.
08-28 10:15:27.314: I/dalvikvm(11960): "main" prio=5 tid=1 RUNNABLE
08-28 10:15:27.314: I/dalvikvm(11960): | group="main" sCount=0 dsCount=0 obj=0x41f99538 self=0x40b06010
08-28 10:15:27.314: I/dalvikvm(11960): | sysTid=11960 nice=0 sched=0/0 cgrp=apps handle=1074563116
08-28 10:15:27.314: I/dalvikvm(11960): | schedstat=( 3654714000 557222000 1624 ) utm=311 stm=54 core=3
08-28 10:15:27.314: I/dalvikvm(11960): at android.graphics.BitmapFactory.nativeDecodeStream(Native Method)
08-28 10:15:27.329: I/dalvikvm(11960): at android.graphics.BitmapFactory.decodeStream(BitmapFactory.java:658)
08-28 10:15:27.329: I/dalvikvm(11960): at android.graphics.BitmapFactory.decodeFile(BitmapFactory.java:347)
08-28 10:15:27.329: I/dalvikvm(11960): at android.graphics.BitmapFactory.decodeFile(BitmapFactory.java:430)
08-28 10:15:27.329: I/dalvikvm(11960): at com.lanlong.test.AndrodTestActivity.onCreate(AndrodTestActivity.java:42)
08-28 10:15:27.329: I/dalvikvm(11960): at android.app.Activity.performCreate(Activity.java:5066)
08-28 10:15:27.354: I/dalvikvm(11960): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1101)
08-28 10:15:27.354: I/dalvikvm(11960): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2307)
08-28 10:15:27.354: I/dalvikvm(11960): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2387)
08-28 10:15:27.354: I/dalvikvm(11960): at android.app.ActivityThread.access$600(ActivityThread.java:151)
08-28 10:15:27.354: I/dalvikvm(11960): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1331)
08-28 10:15:27.354: I/dalvikvm(11960): at android.os.Handler.dispatchMessage(Handler.java:99)
08-28 10:15:27.354: I/dalvikvm(11960): at android.os.Looper.loop(Looper.java:155)
08-28 10:15:27.354: I/dalvikvm(11960): at android.app.ActivityThread.main(ActivityThread.java:5485)
08-28 10:15:27.354: I/dalvikvm(11960): at java.lang.reflect.Method.invokeNative(Native Method)
08-28 10:15:27.354: I/dalvikvm(11960): at java.lang.reflect.Method.invoke(Method.java:511)
08-28 10:15:27.354: I/dalvikvm(11960): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1028)
08-28 10:15:27.354: I/dalvikvm(11960): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:795)
08-28 10:15:27.354: I/dalvikvm(11960): at dalvik.system.NativeStart.main(Native Method)
08-28 10:15:27.354: E/dalvikvm(11960): Out of memory: Heap Size=65571KB, Allocated=63680KB, Limit=65536KB
08-28 10:15:27.354: E/dalvikvm(11960): Extra info: Footprint=65571KB, Allowed Footprint=65571KB, Trimmed=0KB
08-28 10:15:27.354: D/skia(11960): --- decoder->decode returned false
08-28 10:15:27.354: W/dalvikvm(11960): threadid=1: thread exiting with uncaught exception (group=0x41f982d0)
08-28 10:15:27.359: E/AndroidRuntime(11960): FATAL EXCEPTION: main
08-28 10:15:27.359: E/AndroidRuntime(11960): java.lang.OutOfMemoryError: (Heap Size=65571KB, Allocated=63680KB)
08-28 10:15:27.359: E/AndroidRuntime(11960): at android.graphics.BitmapFactory.nativeDecodeStream(Native Method)
08-28 10:15:27.359: E/AndroidRuntime(11960): at android.graphics.BitmapFactory.decodeStream(BitmapFactory.java:658)
08-28 10:15:27.359: E/AndroidRuntime(11960): at android.graphics.BitmapFactory.decodeFile(BitmapFactory.java:347)
08-28 10:15:27.359: E/AndroidRuntime(11960): at android.graphics.BitmapFactory.decodeFile(BitmapFactory.java:430)
08-28 10:15:27.359: E/AndroidRuntime(11960): at com.lanlong.test.AndrodTestActivity.onCreate(AndrodTestActivity.java:42)
08-28 10:15:27.359: E/AndroidRuntime(11960): at android.app.Activity.performCreate(Activity.java:5066)
08-28 10:15:27.359: E/AndroidRuntime(11960): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1101)
08-28 10:15:27.359: E/AndroidRuntime(11960): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2307)
08-28 10:15:27.359: E/AndroidRuntime(11960): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2387)
08-28 10:15:27.359: E/AndroidRuntime(11960): at android.app.ActivityThread.access$600(ActivityThread.java:151)
08-28 10:15:27.359: E/AndroidRuntime(11960): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1331)
08-28 10:15:27.359: E/AndroidRuntime(11960): at android.os.Handler.dispatchMessage(Handler.java:99)
08-28 10:15:27.359: E/AndroidRuntime(11960): at android.os.Looper.loop(Looper.java:155)
08-28 10:15:27.359: E/AndroidRuntime(11960): at android.app.ActivityThread.main(ActivityThread.java:5485)
08-28 10:15:27.359: E/AndroidRuntime(11960): at java.lang.reflect.Method.invokeNative(Native Method)
08-28 10:15:27.359: E/AndroidRuntime(11960): at java.lang.reflect.Method.invoke(Method.java:511)
08-28 10:15:27.359: E/AndroidRuntime(11960): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1028)
08-28 10:15:27.359: E/AndroidRuntime(11960): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:795)
08-28 10:15:27.359: E/AndroidRuntime(11960): at dalvik.system.NativeStart.main(Native Method)
=======================================================================
下面这个是从网上找到的，地址http://blog.sina.com.cn/s/blog_5fc933730101ay5x.html
1， 比较Drawable与Bitmap占用内存大小
2， 比较BitmapFactory类的decodeResource方法与decodeStream方法的效率
好吧，先来看第1个测试！
以下这个是测试加载1000个Drawable对象的代码，很简单的，我就不解释了！
publicclassMainextendsActivity
{
intnumber= 1000;
Drawable[] array;
@Override
publicvoidonCreate(BundlesavedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
array = new BitmapDrawable[number];
for(int i = 0; i <</SPAN>number; i++)
{
Log.e("", "测试第" + (i+1) + "张图片");
array[i] =getResources().getDrawable(R.drawable.img);
}
}
}
输出结果：
04-07 21:49:25.248: D/szipinf(7828):Initializing inflate state
04-07 21:49:25.398: E/(7828):测试第1张图片
04-07 21:49:25.658: D/dalvikvm(7828):GC_EXTERNAL_ALLOC freed 48K, 50% free 2692K/5379K, external 0K/0K,paused 24ms
04-07 21:49:25.748: E/(7828):测试第2张图片
04-07 21:49:25.748: E/(7828):测试第3张图片
………………
………………
04-0721:49:26.089: E/(7828): 测试第998张图片
04-0721:49:26.089: E/(7828): 测试第999张图片
04-0721:49:26.089: E/(7828): 测试第1000张图片
程序没有报错，正常运行，加载1000个Drawable对象没问题。
下面再来看一下加载1000个Bitmap对象的代码，同样的，代码很简单的，我就不解释了！
publicclassMainextendsActivity
{
intnumber= 1000;
Bitmap bitmap[];
@Override
publicvoidonCreate(BundlesavedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
bitmap= newBitmap[number];
for(inti = 0; i<</SPAN> number;i++)
{
Log.e("", "测试第" + (i+1) +"张图片");
bitmap[i] =BitmapFactory.decodeResource(getResources(),R.drawable.img);
}
}
}
输出结果：
04-07 22:06:05.344: D/szipinf(7937):Initializing inflate state
04-07 22:06:05.374: E/(7937):测试第1张图片
04-07 22:06:05.544: D/dalvikvm(7937):GC_EXTERNAL_ALLOC freed 51K, 50% free 2692K/5379K, external 0K/0K,paused 40ms
04-07 22:06:05.664: E/(7937):测试第2张图片
04-07 22:06:05.774: D/dalvikvm(7937):GC_EXTERNAL_ALLOC freed 1K, 50% free 2691K/5379K, external6026K/7525K, paused 31ms
04-07 22:06:05.834: E/(7937):测试第3张图片
04-07 22:06:05.934: D/dalvikvm(7937):GC_EXTERNAL_ALLOC freed <1K, 50% free 2691K/5379K, external12052K/14100K, paused 24ms
04-07 22:06:06.004: E/(7937):测试第4张图片
04-07 22:06:06.124: D/dalvikvm(7937):GC_EXTERNAL_ALLOC freed <1K, 50% free 2691K/5379K, external18078K/20126K, paused 27ms
04-07 22:06:06.204: E/(7937):测试第5张图片
04-07 22:06:06.315: D/dalvikvm(7937):GC_EXTERNAL_ALLOC freed <1K, 50% free 2691K/5379K, external24104K/26152K, paused 26ms
04-07 22:06:06.395: E/(7937):测试第6张图片
04-07 22:06:06.495: D/dalvikvm(7937):GC_EXTERNAL_ALLOC freed <1K, 50% free 2691K/5379K, external30130K/32178K, paused 22ms
04-07 22:06:06.565: E/(7937):测试第7张图片
04-07 22:06:06.665: D/dalvikvm(7937):GC_EXTERNAL_ALLOC freed <1K, 50% free 2691K/5379K, external36156K/38204K, paused 22ms
04-07 22:06:06.745: E/(7937):测试第8张图片
04-07 22:06:06.845: D/dalvikvm(7937):GC_EXTERNAL_ALLOC freed 2K, 51% free 2689K/5379K, external42182K/44230K, paused 23ms
04-07 22:06:06.845:E/dalvikvm-heap(7937): 6170724-byte external allocation too largefor this process.
04-07 22:06:06.885:I/dalvikvm-heap(7937): Clamp target GC heap from 48.239MB to48.000MB
04-07 22:06:06.885:E/GraphicsJNI(7937): VM won't let us allocate 6170724bytes
04-07 22:06:06.885: D/dalvikvm(7937):GC_FOR_MALLOC freed <1K, 51% free 2689K/5379K, external42182K/44230K, paused 25ms
04-07 22:06:06.885:D/AndroidRuntime(7937): Shutting down VM
04-07 22:06:06.885: W/dalvikvm(7937):threadid=1: thread exiting with uncaught exception(group=0x40015560)
04-07 22:06:06.885:E/AndroidRuntime(7937): FATAL EXCEPTION: main
04-07 22:06:06.885:E/AndroidRuntime(7937): java.lang.OutOfMemoryError: bitmap sizeexceeds VM budget
04-07 22:06:06.885:E/AndroidRuntime(7937): atandroid.graphics.Bitmap.nativeCreate(NativeMethod)
04-07 22:06:06.885:E/AndroidRuntime(7937): atandroid.graphics.Bitmap.createBitmap(Bitmap.java:477)
04-07 22:06:06.885:E/AndroidRuntime(7937): atandroid.graphics.Bitmap.createBitmap(Bitmap.java:444)
04-07 22:06:06.885:E/AndroidRuntime(7937): atandroid.graphics.Bitmap.createScaledBitmap(Bitmap.java:349)
04-07 22:06:06.885:E/AndroidRuntime(7937): atandroid.graphics.BitmapFactory.finishDecode(BitmapFactory.java:498)
04-07 22:06:06.885:E/AndroidRuntime(7937): atandroid.graphics.BitmapFactory.decodeStream(BitmapFactory.java:473)
04-07 22:06:06.885:E/AndroidRuntime(7937): atandroid.graphics.BitmapFactory.decodeResourceStream(BitmapFactory.java:336)
04-07 22:06:06.885:E/AndroidRuntime(7937): atandroid.graphics.BitmapFactory.decodeResource(BitmapFactory.java:359)
04-07 22:06:06.885:E/AndroidRuntime(7937): atandroid.graphics.BitmapFactory.decodeResource(BitmapFactory.java:385)
04-07 22:06:06.885:E/AndroidRuntime(7937): atbassy.test.drawable.Main.onCreate(Main.java:37)
04-07 22:06:06.885:E/AndroidRuntime(7937): atandroid.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
04-07 22:06:06.885:E/AndroidRuntime(7937): atandroid.app.ActivityThread.performLaunchActivity(ActivityThread.java:1722)
04-07 22:06:06.885:E/AndroidRuntime(7937): atandroid.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1784)
04-07 22:06:06.885:E/AndroidRuntime(7937): atandroid.app.ActivityThread.access$1500(ActivityThread.java:123)
04-07 22:06:06.885:E/AndroidRuntime(7937): atandroid.app.ActivityThread$H.handleMessage(ActivityThread.java:939)
04-07 22:06:06.885:E/AndroidRuntime(7937): atandroid.os.Handler.dispatchMessage(Handler.java:99)
04-07 22:06:06.885:E/AndroidRuntime(7937): atandroid.os.Looper.loop(Looper.java:130)
04-07 22:06:06.885:E/AndroidRuntime(7937): atandroid.app.ActivityThread.main(ActivityThread.java:3835)
04-07 22:06:06.885:E/AndroidRuntime(7937): atjava.lang.reflect.Method.invokeNative(NativeMethod)
04-07 22:06:06.885:E/AndroidRuntime(7937): atjava.lang.reflect.Method.invoke(Method.java:507)
04-07 22:06:06.885:E/AndroidRuntime(7937): atcom.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:847)
04-07 22:06:06.885:E/AndroidRuntime(7937): atcom.android.internal.os.ZygoteInit.main(ZygoteInit.java:605)
04-07 22:06:06.885:E/AndroidRuntime(7937): atdalvik.system.NativeStart.main(Native Method)
看看上面的输出，才加载到第8张图片，程序就报错了“java.lang.OutOfMemoryError: bitmap size exceeds VMbudget”。
通过上面的例子，可以看清楚地看出来，使用Drawable保存图片对象，占用更小的内存空间。
而使用Biamtp对象，则会占用很大内存空间，很容易就出现OOM了！
下面我们再来看一个例子，这个也是加载Bitmap对象。
只不过，之次不是使用BitmapFactory的decodeResource方法，
而是使用decodeStream方法，看代码。
public class Main extends Activity
{
int number = 1000;
Bitmap bitmap[];
@Override
public void onCreate(BundlesavedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
bitmap = new Bitmap[number];
for (int i = 0; i <</SPAN>number; i++)
{
Log.e("", "测试第" + (i+1) + "张图片");
bitmap[i] = BitmapFactory.decodeStream(getResources().openRawResource(R.drawable.img));//这里换了方法
}
}
}
输出结果：
04-07 22:16:12.676: E/(8091):测试第561张图片
04-07 22:16:12.756: E/(8091):测试第562张图片
04-07 22:16:12.826: E/(8091):测试第563张图片
04-07 22:16:12.906: E/(8091):测试第564张图片
04-07 22:16:12.906: D/skia(8091):---------- mmap failed for imageref_ashmem size=2744320err=12
04-07 22:16:12.906: E/(8091):测试第565张图片
04-07 22:16:12.906: D/skia(8091):---------- mmap failed for imageref_ashmem size=2744320err=12
04-07 22:16:12.906: E/(8091):测试第566张图片
04-07 22:16:12.916: E/filemap(8091):mmap(0,416798) failed: Out of memory
04-07 22:16:12.916: D/filemap(8091):munmap(0x0, 0) failed
04-07 22:16:12.916: W/asset(8091):create map from entry failed
04-07 22:16:12.916:D/AndroidRuntime(8091): Shutting down VM
04-07 22:16:12.916: W/dalvikvm(8091):threadid=1: thread exiting with uncaught exception(group=0x40015560)
04-07 22:16:12.936:E/AndroidRuntime(8091): FATAL EXCEPTION: main
04-07 22:16:12.936:E/AndroidRuntime(8091): java.lang.RuntimeException: Unable to startactivityComponentInfo{bassy.test.drawable/bassy.test.drawable.Main}:android.content.res.Resources$NotFoundException: Fileres/drawable-mdpi/img.png from drawable resource ID#0x7f020001
04-07 22:16:12.936:E/AndroidRuntime(8091): atandroid.app.ActivityThread.performLaunchActivity(ActivityThread.java:1768)
04-07 22:16:12.936:E/AndroidRuntime(8091): atandroid.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1784)
04-07 22:16:12.936:E/AndroidRuntime(8091): atandroid.app.ActivityThread.access$1500(ActivityThread.java:123)
04-07 22:16:12.936:E/AndroidRuntime(8091): atandroid.app.ActivityThread$H.handleMessage(ActivityThread.java:939)
04-07 22:16:12.936:E/AndroidRuntime(8091): atandroid.os.Handler.dispatchMessage(Handler.java:99)
04-07 22:16:12.936:E/AndroidRuntime(8091): atandroid.os.Looper.loop(Looper.java:130)
04-07 22:16:12.936:E/AndroidRuntime(8091): atandroid.app.ActivityThread.main(ActivityThread.java:3835)
04-07 22:16:12.936:E/AndroidRuntime(8091): atjava.lang.reflect.Method.invokeNative(NativeMethod)
04-07 22:16:12.936:E/AndroidRuntime(8091): atjava.lang.reflect.Method.invoke(Method.java:507)
04-07 22:16:12.936:E/AndroidRuntime(8091): atcom.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:847)
04-07 22:16:12.936:E/AndroidRuntime(8091): atcom.android.internal.os.ZygoteInit.main(ZygoteInit.java:605)
04-07 22:16:12.936:E/AndroidRuntime(8091): atdalvik.system.NativeStart.main(Native Method)
04-07 22:16:12.936:E/AndroidRuntime(8091): Caused by:android.content.res.Resources$NotFoundException: Fileres/drawable-mdpi/img.png from drawable resource ID#0x7f020001
04-07 22:16:12.936:E/AndroidRuntime(8091): atandroid.content.res.Resources.openRawResource(Resources.java:860)
04-07 22:16:12.936:E/AndroidRuntime(8091): atandroid.content.res.Resources.openRawResource(Resources.java:836)
04-07 22:16:12.936:E/AndroidRuntime(8091): atbassy.test.drawable.Main.onCreate(Main.java:43)
04-07 22:16:12.936:E/AndroidRuntime(8091): atandroid.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
04-07 22:16:12.936:E/AndroidRuntime(8091): atandroid.app.ActivityThread.performLaunchActivity(ActivityThread.java:1722)
04-07 22:16:12.936:E/AndroidRuntime(8091): ... 11more
04-07 22:16:12.936:E/AndroidRuntime(8091): Caused by: java.io.FileNotFoundException:res/drawable-mdpi/img.png
04-07 22:16:12.936:E/AndroidRuntime(8091): atandroid.content.res.AssetManager.openNonAssetNative(NativeMethod)
04-07 22:16:12.936:E/AndroidRuntime(8091): atandroid.content.res.AssetManager.openNonAsset(AssetManager.java:429)
04-07 22:16:12.936:E/AndroidRuntime(8091): atandroid.content.res.Resources.openRawResource(Resources.java:857)
04-07 22:16:12.936:E/AndroidRuntime(8091): ... 15more
从上面可以看出，程序在加载到第566张的时候，就出现了OOM错误。
不过，跟第2个例子比起来，你会发现，程序可以加载更多的图片。
这说明了使用BitmapFactory的decodeResource方法会占据大量内存，
而使用使用decodeStream方法，则占据更小的内存。
从时间上来说，看看日志输出，大概估算了一下加载一张图片所需要的时间，发现，
decodeResource加载图片需要约0.17秒的时间，
而使用decodeStream方法，只需要约0.08秒的时间！
这说明了，decodeStream无论是时间上还是空间上，都比decodeResource方法更优秀！！
从上面三个例子，可以看出，用第一种方法（即用Drawable加载图片）可以加载更加的图片，加载32张图片的时间约为0.01秒！
我试着把Drawable的数量调至1000000，程序在运行时，停在了153761张图片里，手机提示，“应用程序无响应…”
个人猜测，Drawable应该不属于常驻内存的对象，不然的话，不可能不会出现OOM的～～
网上关于Drawable与Bitmap的资料太少，不能深入学习，真是遗憾～
刚才又做了个测试，把第一个例子中的
array[i] =getResources().getDrawable(R.drawable.img);
方法换成了
array[i] =Drawable.createFromStream(getResources().openRawResource(R.drawable.img),null);
二维码，最早发明于日本，它是用某种特定的几何图形按一定规律在平面（二维方向上）分布的黑白相间的图形记录数据符号信息的，使用若干个与二进制相对应的几何形体来表示文字数值信息，通过图象输入设备或光电扫描设备自动识读以实现信息自动处理。它具有条码技术的一些共性：每种码制有其特定的字符集；每个字符占有一定的宽度；具有一定的校验功能等。同时还具有对不同行的信息自动识别功能、及处理图形旋转变化等特点。
二维码技术获得了广泛应用，今天我们要讲的这个场景就是使用二维码来进行登录，这样可以省去用户输入繁琐的用户名和密码，只要拿出手机拍一下（第一次还是要输入的哈）就ok了。在一些输入不是很方便的设备上（比如智能电视）还是很实用的一个功能滴。目前企鹅和一些游戏已经支持了，可以去尝试一下。
好了，废话不多说，我们先来分析一下整个二维码登录的流程，附图：
流程图就不再详细解释，TV端在拿到授权token之后，就可以请求登录了，这就是整个二维码的登录流程。
接下来，我们分析一下几个角色和他们要做的事情：
首先是TV：
1.将自身设备guid发送给服务端
2.接收服务端生成的二维码图片（Base64 转 Image）
3.使用websocket请求服务端推送登录token （技术点：websocket支持）
手机端：
1.二维码解码（这个不多说，zxing等开源类库支持）
2.请求登录接口
服务端：
1.websocket推送登录token
2.二维码生成
手机端比较简单，二维码解码网上的例子有很多，这里就不多说了，在后面我们仅仅模拟一下登录即可。
重点给出TV端登录示例（手机也可使用）。
原文链接：http://www.67tgb.com/?p=620
转载注明：望月听涛
1楼lfmilaoshi3天前 11:27这都是非常实用的技术，分享给大家，给人类的贡献。Re: wangyuetingtao3天前 14:27回复lfmilaoshin对，这就是人类的贡献，我来分享给大家。