Android -- Drawable与Bitmap测试
Drawable
以下这个是测试加载1000个Drawable对象的代码：
public class Main extends Activity
{
int number = 1000;
Drawable[] array;
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
array = new BitmapDrawable[number];
for(int i = 0; i < 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
………………
………………
04-07 21:49:26.089: E/(7828): 测试第998张图片
04-07 21:49:26.089: E/(7828): 测试第999张图片
04-07 21:49:26.089: 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。
Bitmap
下面再来看一下加载1000个Bitmap对象的代码：
public class Main extends Activity
{
int number = 1000;
Bitmap bitmap[];
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
bitmap = new Bitmap[number];
for (int i = 0; i < 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, external 6026K/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, external 12052K/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, external 18078K/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, external 24104K/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, external 30130K/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, external 36156K/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, external 42182K/44230K, paused 23ms
04-07 22:06:06.845: E/dalvikvm-heap(7937): 6170724-byte external allocation too large for this process.
04-07 22:06:06.885: I/dalvikvm-heap(7937): Clamp target GC heap from 48.239MB to 48.000MB
04-07 22:06:06.885: E/GraphicsJNI(7937): VM won't let us allocate 6170724 bytes
04-07 22:06:06.885: D/dalvikvm(7937): GC_FOR_MALLOC freed <1K, 51% free 2689K/5379K, external 42182K/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 size exceeds VM budget
04-07 22:06:06.885: E/AndroidRuntime(7937): at android.graphics.Bitmap.nativeCreate(Native Method)
04-07 22:06:06.885: E/AndroidRuntime(7937): at android.graphics.Bitmap.createBitmap(Bitmap.java:477)
04-07 22:06:06.885: E/AndroidRuntime(7937): at android.graphics.Bitmap.createBitmap(Bitmap.java:444)
04-07 22:06:06.885: E/AndroidRuntime(7937): at android.graphics.Bitmap.createScaledBitmap(Bitmap.java:349)
04-07 22:06:06.885: E/AndroidRuntime(7937): at android.graphics.BitmapFactory.finishDecode(BitmapFactory.java:498)
04-07 22:06:06.885: E/AndroidRuntime(7937): at android.graphics.BitmapFactory.decodeStream(BitmapFactory.java:473)
04-07 22:06:06.885: E/AndroidRuntime(7937): at android.graphics.BitmapFactory.decodeResourceStream(BitmapFactory.java:336)
04-07 22:06:06.885: E/AndroidRuntime(7937): at android.graphics.BitmapFactory.decodeResource(BitmapFactory.java:359)
04-07 22:06:06.885: E/AndroidRuntime(7937): at android.graphics.BitmapFactory.decodeResource(BitmapFactory.java:385)
04-07 22:06:06.885: E/AndroidRuntime(7937): at bassy.test.drawable.Main.onCreate(Main.java:37)
04-07 22:06:06.885: E/AndroidRuntime(7937): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
04-07 22:06:06.885: E/AndroidRuntime(7937): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1722)
04-07 22:06:06.885: E/AndroidRuntime(7937): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1784)
04-07 22:06:06.885: E/AndroidRuntime(7937): at android.app.ActivityThread.access$1500(ActivityThread.java:123)
04-07 22:06:06.885: E/AndroidRuntime(7937): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:939)
04-07 22:06:06.885: E/AndroidRuntime(7937): at android.os.Handler.dispatchMessage(Handler.java:99)
04-07 22:06:06.885: E/AndroidRuntime(7937): at android.os.Looper.loop(Looper.java:130)
04-07 22:06:06.885: E/AndroidRuntime(7937): at android.app.ActivityThread.main(ActivityThread.java:3835)
04-07 22:06:06.885: E/AndroidRuntime(7937): at java.lang.reflect.Method.invokeNative(Native Method)
04-07 22:06:06.885: E/AndroidRuntime(7937): at java.lang.reflect.Method.invoke(Method.java:507)
04-07 22:06:06.885: E/AndroidRuntime(7937): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:847)
04-07 22:06:06.885: E/AndroidRuntime(7937): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:605)
04-07 22:06:06.885: E/AndroidRuntime(7937): at dalvik.system.NativeStart.main(Native Method)
看看上面的输出，才加载到第8张图片，程序就报错了“java.lang.OutOfMemoryError: bitmap size exceeds VM budget”。通过上面的例子，可以看清楚地看出来，使用Drawable保存图片对象，占用更小的内存空间。而使用Biamtp对象，则会占用很大内存空间，很容易就出现OOM了！
下面我们再来看一个例子，这个也是加载Bitmap对象。只不过，之次不是使用BitmapFactory的decodeResource方法，而是使用decodeStream方法，看代码。
public class Main extends Activity
{
int number = 1000;
Bitmap bitmap[]; @Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main); bitmap = new Bitmap[number]; for (int i = 0; i < number; i++)
{
Log.e("", "测试第" + (i+1) + "张图片");
bitmap[i] =BitmapFactory.decodeStream(getResources().openRawResource(R.drawable.img));//这里换了方法
}
}
}
输出结果：
04-07 22:16:12.676: E/(8091): 测试第561张图片
04-07 22:16:12.756: E/(8091): 测试第562张图片
04-07 22:16:12.826: E/(8091): 测试第563张图片
04-07 22:16:12.906: E/(8091): 测试第564张图片
04-07 22:16:12.906: D/skia(8091): ---------- mmap failed for imageref_ashmem size=2744320 err=12
04-07 22:16:12.906: E/(8091): 测试第565张图片
04-07 22:16:12.906: D/skia(8091): ---------- mmap failed for imageref_ashmem size=2744320 err=12
04-07 22:16:12.906: E/(8091): 测试第566张图片
04-07 22:16:12.916: E/filemap(8091): mmap(0,416798) failed: Out of memory
04-07 22:16:12.916: D/filemap(8091): munmap(0x0, 0) failed
04-07 22:16:12.916: W/asset(8091): create map from entry failed
04-07 22:16:12.916: D/AndroidRuntime(8091): Shutting down VM
04-07 22:16:12.916: W/dalvikvm(8091): threadid=1: thread exiting with uncaught exception (group=0x40015560)
04-07 22:16:12.936: E/AndroidRuntime(8091): FATAL EXCEPTION: main
04-07 22:16:12.936: E/AndroidRuntime(8091): java.lang.RuntimeException: Unable to start activity ComponentInfo{bassy.test.drawable/bassy.test.drawable.Main}: android.content.res.Resources$NotFoundException: File res/drawable-mdpi/img.png from drawable resource ID #0x7f020001
04-07 22:16:12.936: E/AndroidRuntime(8091): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1768)
04-07 22:16:12.936: E/AndroidRuntime(8091): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1784)
04-07 22:16:12.936: E/AndroidRuntime(8091): at android.app.ActivityThread.access$1500(ActivityThread.java:123)
04-07 22:16:12.936: E/AndroidRuntime(8091): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:939)
04-07 22:16:12.936: E/AndroidRuntime(8091): at android.os.Handler.dispatchMessage(Handler.java:99)
04-07 22:16:12.936: E/AndroidRuntime(8091): at android.os.Looper.loop(Looper.java:130)
04-07 22:16:12.936: E/AndroidRuntime(8091): at android.app.ActivityThread.main(ActivityThread.java:3835)
04-07 22:16:12.936: E/AndroidRuntime(8091): at java.lang.reflect.Method.invokeNative(Native Method)
04-07 22:16:12.936: E/AndroidRuntime(8091): at java.lang.reflect.Method.invoke(Method.java:507)
04-07 22:16:12.936: E/AndroidRuntime(8091): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:847)
04-07 22:16:12.936: E/AndroidRuntime(8091): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:605)
04-07 22:16:12.936: E/AndroidRuntime(8091): at dalvik.system.NativeStart.main(Native Method)
04-07 22:16:12.936: E/AndroidRuntime(8091): Caused by: android.content.res.Resources$NotFoundException: File res/drawable-mdpi/img.png from drawable resource ID #0x7f020001
04-07 22:16:12.936: E/AndroidRuntime(8091): at android.content.res.Resources.openRawResource(Resources.java:860)
04-07 22:16:12.936: E/AndroidRuntime(8091): at android.content.res.Resources.openRawResource(Resources.java:836)
04-07 22:16:12.936: E/AndroidRuntime(8091): at bassy.test.drawable.Main.onCreate(Main.java:43)
04-07 22:16:12.936: E/AndroidRuntime(8091): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
04-07 22:16:12.936: E/AndroidRuntime(8091): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1722)
04-07 22:16:12.936: E/AndroidRuntime(8091): ... 11 more
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): at android.content.res.AssetManager.openNonAssetNative(Native Method)
04-07 22:16:12.936: E/AndroidRuntime(8091): at android.content.res.AssetManager.openNonAsset(AssetManager.java:429)
04-07 22:16:12.936: E/AndroidRuntime(8091): at android.content.res.Resources.openRawResource(Resources.java:857)
04-07 22:16:12.936: E/AndroidRuntime(8091): ... 15 more
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。
我是天王盖地虎的分割线
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～～
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);
结果和第三个例子一样，在第566张图片中，出现了OOM错误！而且，加载的时间都是一样～～
我是天王盖地虎的分割线
- Bitmap转Drawable
Bitmap bm=xxx; //xxx根据你的情况获取
BitmapDrawable bd=BitmapDrawable(bm);
Android开发网提示因为BtimapDrawable是Drawable的子类，最终直接使用bd对象即可。
- Drawable转Bitmap
转成Bitmap对象后，可以将Drawable对象通过Android的SK库存成一个字节输出流，最终还可以保存成为jpg和png的文件。
Drawable d=xxx; //xxx根据自己的情况获取drawable
BitmapDrawable bd = (BitmapDrawable) d;
Bitmap bm = bd.getBitmap();
最终bm就是我们需要的Bitmap对象了。
参考：http://blog.csdn.net/ygc973797893/article/details/7620352
Android -- Drawable与Bitmap测试的更多相关文章
- Android Drawable、Bitmap、byte[]之间的转换
转自http://blog.csdn.net/june5253/article/details/7826597 1.Bitmap-->Drawable Bitmap drawable2Bitma ...
- Android Drawable和Bitmap区别
一.相关概念 1.Drawable就是一个可画的对象,其可能是一张位图(BitmapDrawable),也可能是一个图形(ShapeDrawable),还有可能是一个图层(LayerDrawable) ...
- Android,View转换bitmap,bitmap转换drawable
Android View转换Bitmap,Bitmap转换Drawable //测试设置bitmap View view1 = ViewGroup.inflate(context, R.layout. ...
- android 获取资源文件 r.drawable中的图片转换为drawable、bitmap
1.R-Drawable Resources resources = mContext.getResources(); Drawable drawable = resources.getDrawabl ...
- Android -- Drawable && Bitmap
Bitmap转Drawable Bitmap bm=xxx; BitmapDrawable bd=new BitmapDrawable(bm); 因为BtimapDrawable是Drawable的子 ...
- android开发之Bitmap 、byte[] 、 Drawable之间的相互转换
一.相关概念 1.Drawable就是一个可画的对象,其可能是一张位图(BitmapDrawable),也可能是一个图形(ShapeDrawable),还有可能是一个图层(LayerDrawable) ...
- 浅谈Android下的Bitmap之大Bitmap加载
引言 我们常常提到的“Android程序优化”,通常指的是性能和内存的优化,即:更快的响应速度,更低的内存占用.Android程序的性能和内存问题,大部分都和图片紧密相关,而图片的加载在很多情况下很用 ...
- Drawable与Bitmap（转）
Drawable 以下这个是测试加载10 ...
- Android Drawable 那些不为人知的高效用法
转载请标明出处:http://blog.csdn.net/lmj623565791/article/details/43752383,本文出自:[张鸿洋的博客] 1.概述 Drawable在我们平时的 ...
随机推荐
- VS2013 试用版到期 解决办法
摘自:http://jingyan.baidu.com/article/fec7a1e5100b481190b4e7d9.html 输入密钥:BWG7X-J98B3-W34RT-33B3R-JVYW9
- App Naver Line 5.3 add new features - "True Delete"
Line is getting more and more popular in recent years. Lots of peope use Line, so do "Suspects& ...
- Oracle数据库中的Function调用参数问题
在工作中用到了Oracle数据库,需要调用Oracle的Function,Function返回的游标和结果都是通过参数来获取的 比如Function定义如下: , intype, ininttype) ...
- kettle教程（1） 简单入门、kettle简单插入与更新。打开kettle
本文要点:Kettle的建立数据库连接.使用kettle进行简单的全量对比插入更新:kettle会自动对比用户设置的对比字段,若目标表不存在该字段,则新插入该条记录.若存在,则更新. Kettle ...
- php输出函数 var_dump, dump,print,print_r 区别
php输出函数 var_dump, dump,print,print_r 区别 周末有空就来整理下
- PHP+ajax聊天室源码！支持长轮循跟定时请求两种
var lastID = "1";//声明上次取回的消息的ID var isposted = false; var mGetTime;//设置setTimeout的返回值 // ...
- Yii框架中使用PHPExcel导出Excel文件
最近在研究PHP的Yii框架,很喜欢,碰到导出Excel的问题,研究了一下,就有了下面的方法: 1.首先在config\main.php中添加对PHPExcel的引用,我的方式是这样: 1 2 3 4 ...
- phpcms后台部分修改
1.后台登陆前提示信息取消及成功后提示信息取消. (1)后台登陆前提示信息取消 phpcms\modules\admin\classes\admin.class.ph ...
- 利用HttpWebRequest访问WebApi
WebApi现在越来越流行,下面给出利用HttpWebRequest访问WebApi的工具方法: 1.利用基准URL和参数字典生成完整URL /// <summary> /// 生成URL ...
- MVC的Filters（拦截过滤）的Error页面，支持Ajax报错
报错拦截过滤到error页面 [AttributeUsage(AttributeTargets.Method | AttributeTargets.Class, Inherited = true, A ...