三步解决帧动画图片过多造成的OOM

来源：互联网发布：知达常青藤中学校介绍编辑：程序博客网时间：2024/04/29 03:15

主要三个步骤：
说明：我只测试了63张，蛮好用，推荐给大家

1.首先我们导入一个我们需要的 commons-io-1.4.jar
2.新建一个工具类MyAnimationDrawable.Java ()

package com.example.frame.demo;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import org.apache.commons.io.IOUtils;
import org.xmlpull.v1.XmlPullParser;
import org.xmlpull.v1.XmlPullParserException;
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;

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);
}


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);
}
});
}

//
private static void loadRaw(final int resourceId, final Context context,
final OnDrawableLoadedListener onDrawableLoadedListener) {
loadFromXml(resourceId, context, onDrawableLoadedListener);
}

//
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();
}

//
private static void animateRawManually(List<MyFrame> myFrames,
ImageView imageView, Runnable onComplete) {
animateRawManually(myFrames, imageView, onComplete, 0);
}

//
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();
}
}

//带时间的方法
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));
}

}

3.MainActivity 中的代码

package com.example.frame;

import com.example.frame.demo.MyAnimationDrawable;

import android.app.Activity;
import android.os.Bundle;
import android.widget.ImageView;

public class MainActivity extends Activity {
private ImageView animation_tower; //显示帧动画的图片
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
animation_tower=(ImageView) findViewById(R.id.animation_airship);
run();
}
private void run() {
// TODO Auto-generated method stub
MyAnimationDrawable.animateRawManuallyFromXML(R.drawable.activity_main//帧动画（）
,animation_tower //显示帧动画的图片
,null,null); //
}
}
转自：http://blog.csdn.net/ningzhouxu/article/details/51815040

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