欢迎您访问程序员文章站本站旨在为大家提供分享程序员计算机编程知识!
您现在的位置是: 首页  >  移动技术

Android 使用帧动画内存溢出解决方案

程序员文章站 2024-02-25 20:04:45
android 使用帧动画内存溢出解决方案 最近在项目遇到的动画效果不好实现,就让ui切成图,采用帧动画实现效果,但是在使用animation-list时,图片也就11张...

android 使用帧动画内存溢出解决方案

最近在项目遇到的动画效果不好实现,就让ui切成图,采用帧动画实现效果,但是在使用animation-list时,图片也就11张,每张图片大概560k左右,结果内存溢出,崩溃 了,自己用了三张都崩溃;拿代码说;

1.anin_searh.xml

<?xml version="1.0" encoding="utf-8"?> 
<animation-list xmlns:android="http://schemas.android.com/apk/res/android" 
  android:oneshot="true"> 
 <item android:drawable="@drawable/a1" android:duration="100"></item> 
  <item android:drawable="@drawable/a2" android:duration="100"></item> 
  <item android:drawable="@drawable/a4" android:duration="100"></item> 
  <item android:drawable="@drawable/a5" android:duration="100"></item> 
  <item android:drawable="@drawable/a6" android:duration="100"></item> 
  <item android:drawable="@drawable/a7" android:duration="100"></item> 
  <item android:drawable="@drawable/a8" android:duration="100"></item> 
  <item android:drawable="@drawable/a9" android:duration="100"></item> 
  <item android:drawable="@drawable/a10" android:duration="100"></item> 
  <item android:drawable="@drawable/a11" android:duration="100"></item> 
</animation-list> 

2.使用帧动画

search_scale_iv.setbackgroundresource(r.drawable.anim_search); 
    animationdrawable drawable = (animationdrawable) search_scale_iv.getbackground(); 
    drawable.start(); 

结果setbackgroundresource出现内存溢出,这个方法其实获取drawable时候,会消耗很多内存,很容易内存溢出,崩溃。

3.解决方法:在网上找了个类,处理,结果我使用11张560k大小图片,没有内存溢出;

import android.content.context; 
import android.content.res.xmlresourceparser; 
import android.graphics.bitmapfactory; 
import android.graphics.drawable.animationdrawable; 
import android.graphics.drawable.bitmapdrawable; 
import android.graphics.drawable.drawable; 
import android.os.handler; 
import android.widget.imageview; 
 
import org.apache.commons.io.ioutils; 
import org.xmlpull.v1.xmlpullparser; 
import org.xmlpull.v1.xmlpullparserexception; 
 
import java.io.ioexception; 
import java.util.arraylist; 
import java.util.list; 
 
/**** 
 * 此工具类源于stack over flow 
 * 原文链接:http://*.com/questions/8692328/causing-outofmemoryerror-in-frame-by-frame-animation-in-android 
 * 主要使用了bitmapfactory.decodebytearray方法通过底层c来绘制图片,有效防止oom 
 * 使用了第三方类库:org.apache.commons.io.ioutils,将inputstream转为byte字节数组 
 * *******/ 
public class myanimationdrawable { 
 
  public static class myframe { 
    byte[] bytes; 
    int duration; 
    drawable drawable; 
    boolean isready = false; 
  } 
 
  public interface ondrawableloadedlistener { 
    public void ondrawableloaded(list<myframe> myframes); 
  } 
 
  // 1 
  /*** 
   * 性能更优 
   * 在animation-list中设置时间 
   * **/ 
  public static void animaterawmanuallyfromxml(int resourceid, 
                         final imageview imageview, final runnable onstart, 
                         final runnable oncomplete) { 
    loadraw(resourceid, imageview.getcontext(), 
        new ondrawableloadedlistener() { 
          @override 
          public void ondrawableloaded(list<myframe> myframes) { 
            if (onstart != null) { 
              onstart.run(); 
            } 
            animaterawmanually(myframes, imageview, oncomplete); 
          } 
        }); 
  } 
 
  // 2 
  private static void loadraw(final int resourceid, final context context, 
                final ondrawableloadedlistener ondrawableloadedlistener) { 
    loadfromxml(resourceid, context, ondrawableloadedlistener); 
  } 
 
  // 3 
  private static void loadfromxml(final int resourceid, 
                  final context context, 
                  final ondrawableloadedlistener ondrawableloadedlistener) { 
    new thread(new runnable() { 
      @override 
      public void run() { 
        final arraylist<myframe> myframes = new arraylist<myframe>(); 
 
        xmlresourceparser parser = context.getresources().getxml( 
            resourceid); 
 
        try { 
          int eventtype = parser.geteventtype(); 
          while (eventtype != xmlpullparser.end_document) { 
            if (eventtype == xmlpullparser.start_document) { 
 
            } else if (eventtype == xmlpullparser.start_tag) { 
 
              if (parser.getname().equals("item")) { 
                byte[] bytes = null; 
                int duration = 1000; 
 
                for (int i = 0; i < parser.getattributecount(); i++) { 
                  if (parser.getattributename(i).equals( 
                      "drawable")) { 
                    int resid = integer.parseint(parser 
                        .getattributevalue(i) 
                        .substring(1)); 
                    bytes = ioutils.tobytearray(context 
                        .getresources() 
                        .openrawresource(resid)); 
                  } else if (parser.getattributename(i) 
                      .equals("duration")) { 
                    duration = parser.getattributeintvalue( 
                        i, 1000); 
                  } 
                } 
 
                myframe myframe = new myframe(); 
                myframe.bytes = bytes; 
                myframe.duration = duration; 
                myframes.add(myframe); 
              } 
 
            } else if (eventtype == xmlpullparser.end_tag) { 
 
            } else if (eventtype == xmlpullparser.text) { 
 
            } 
 
            eventtype = parser.next(); 
          } 
        } catch (ioexception e) { 
          e.printstacktrace(); 
        } catch (xmlpullparserexception e2) { 
          // todo: handle exception 
          e2.printstacktrace(); 
        } 
 
        // run on ui thread 
        new handler(context.getmainlooper()).post(new runnable() { 
          @override 
          public void run() { 
            if (ondrawableloadedlistener != null) { 
              ondrawableloadedlistener.ondrawableloaded(myframes); 
            } 
          } 
        }); 
      } 
    }).run(); 
  } 
 
  // 4 
  private static void animaterawmanually(list<myframe> myframes, 
                      imageview imageview, runnable oncomplete) { 
    animaterawmanually(myframes, imageview, oncomplete, 0); 
  } 
 
  // 5 
  private static void animaterawmanually(final list<myframe> myframes, 
                      final imageview imageview, final runnable oncomplete, 
                      final int framenumber) { 
    final myframe thisframe = myframes.get(framenumber); 
 
    if (framenumber == 0) { 
      thisframe.drawable = new bitmapdrawable(imageview.getcontext() 
          .getresources(), bitmapfactory.decodebytearray( 
          thisframe.bytes, 0, thisframe.bytes.length)); 
    } else { 
      myframe previousframe = myframes.get(framenumber - 1); 
      ((bitmapdrawable) previousframe.drawable).getbitmap().recycle(); 
      previousframe.drawable = null; 
      previousframe.isready = false; 
    } 
 
    imageview.setimagedrawable(thisframe.drawable); 
    new handler().postdelayed(new runnable() { 
      @override 
      public void run() { 
        // make sure imageview hasn't been changed to a different image 
        // in this time 
        if (imageview.getdrawable() == thisframe.drawable) { 
          if (framenumber + 1 < myframes.size()) { 
            myframe nextframe = myframes.get(framenumber + 1); 
 
            if (nextframe.isready) { 
              // animate next frame 
              animaterawmanually(myframes, imageview, oncomplete, 
                  framenumber + 1); 
            } else { 
              nextframe.isready = true; 
            } 
          } else { 
            if (oncomplete != null) { 
              oncomplete.run(); 
            } 
          } 
        } 
      } 
    }, thisframe.duration); 
 
    // load next frame 
    if (framenumber + 1 < myframes.size()) { 
      new thread(new runnable() { 
        @override 
        public void run() { 
          myframe nextframe = myframes.get(framenumber + 1); 
          nextframe.drawable = new bitmapdrawable(imageview 
              .getcontext().getresources(), 
              bitmapfactory.decodebytearray(nextframe.bytes, 0, 
                  nextframe.bytes.length)); 
          if (nextframe.isready) { 
            // animate next frame 
            animaterawmanually(myframes, imageview, oncomplete, 
                framenumber + 1); 
          } else { 
            nextframe.isready = true; 
          } 
 
        } 
      }).run(); 
    } 
  } 
 
  //第二种方法 
  /*** 
   * 代码中控制时间,但不精确 
   * duration = 1000; 
   * ****/ 
  public static void animatemanuallyfromrawresource( 
      int animationdrawableresourceid, imageview imageview, 
      runnable onstart, runnable oncomplete, int duration) throws ioexception, 
      xmlpullparserexception { 
    animationdrawable animationdrawable = new animationdrawable(); 
 
    xmlresourceparser parser = imageview.getcontext().getresources() 
        .getxml(animationdrawableresourceid); 
 
    int eventtype = parser.geteventtype(); 
    while (eventtype != xmlpullparser.end_document) { 
      if (eventtype == xmlpullparser.start_document) { 
 
      } else if (eventtype == xmlpullparser.start_tag) { 
 
        if (parser.getname().equals("item")) { 
          drawable drawable = null; 
 
          for (int i = 0; i < parser.getattributecount(); i++) { 
            if (parser.getattributename(i).equals("drawable")) { 
              int resid = integer.parseint(parser 
                  .getattributevalue(i).substring(1)); 
              byte[] bytes = ioutils.tobytearray(imageview 
                  .getcontext().getresources() 
                  .openrawresource(resid));//ioutils.readbytes 
              drawable = new bitmapdrawable(imageview 
                  .getcontext().getresources(), 
                  bitmapfactory.decodebytearray(bytes, 0, 
                      bytes.length)); 
            } else if (parser.getattributename(i) 
                .equals("duration")) { 
              duration = parser.getattributeintvalue(i, 66); 
            } 
          } 
 
          animationdrawable.addframe(drawable, duration); 
        } 
 
      } else if (eventtype == xmlpullparser.end_tag) { 
 
      } else if (eventtype == xmlpullparser.text) { 
 
      } 
 
      eventtype = parser.next(); 
    } 
 
    if (onstart != null) { 
      onstart.run(); 
    } 
    animatedrawablemanually(animationdrawable, imageview, oncomplete, 0); 
  } 
 
  private static void animatedrawablemanually( 
      final animationdrawable animationdrawable, 
      final imageview imageview, final runnable oncomplete, 
      final int framenumber) { 
    final drawable frame = animationdrawable.getframe(framenumber); 
    imageview.setimagedrawable(frame); 
    new handler().postdelayed(new runnable() { 
      @override 
      public void run() { 
        // make sure imageview hasn't been changed to a different image 
        // in this time 
        if (imageview.getdrawable() == frame) { 
          if (framenumber + 1 < animationdrawable.getnumberofframes()) { 
            // animate next frame 
            animatedrawablemanually(animationdrawable, imageview, 
                oncomplete, framenumber + 1); 
          } else { 
            // animation complete 
            if (oncomplete != null) { 
              oncomplete.run(); 
            } 
          } 
        } 
      } 
    }, animationdrawable.getduration(framenumber)); 
  } 
 
} 

这里需要导入jar,

import org.apache.commons.io.ioutils;

4.然后通过上述类,来调用自己的动画xml,

myanimationdrawable.animaterawmanuallyfromxml(r.drawable.anim_search, 
            search_scale_iv, new runnable() { 
 
              @override 
              public void run() { 
                // todo onstart 
                // 动画开始时回调 
                log.d("","start"); 
                 
              } 
            }, new runnable() { 
 
              @override 
              public void run() { 
                // todo oncomplete 
                // 动画结束时回调 
                log.d("","end"); 
                 
              } 
            }); 

这样在使用帧动画时,可以有效的适度防止内存溢出,谁还有什么办法,欢迎交流!

感谢阅读,希望能帮助到大家,谢谢大家对本站的支持!