Android 逐帧动画OOM的解决方法
程序员文章站
2022-03-16 16:15:21
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项目中都会使用到动画,有时候会使用到逐帧动画,然后当帧数较多时,就会发生OOM的问题,网上有许多文字是提供一个工具类,解决这个方法。
关于这个工具类的使用的原文地址:http://blog.csdn.net/u014702999/article/details/50544455
效果图(图片是gif需要等待一下才可以使用):
这篇文章主要是换一种思路,如果我们只是需要动画每隔一段时间重复一次。那么我们仅使用gif图片进行展示就可以实现效果,下面提供一个我使用的GifView类,
内存由原来的180M降到了14M
package com.alpha.alphaapp.anim;
import android.annotation.SuppressLint;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Movie;
import android.os.Build;
import android.util.AttributeSet;
import android.view.View;
import com.alpha.alphaapp.R;
public class GifView extends View {
/**
* 默认为1秒
*/
private static final int DEFAULT_MOVIE_DURATION = 1000;
private int mMovieResourceId;
private Movie mMovie;
private long mMovieStart;
//当前动画
private int mCurrentAnimationTime = 0;
private float mLeft;
private float mTop;
private float mScale;
private int mMeasuredMovieWidth;
private int mMeasuredMovieHeight;
private boolean mVisible = true;
private volatile boolean mPaused = false;
public GifView(Context context) {
this(context, null);
}
public GifView(Context context, AttributeSet attrs) {
this(context, attrs, R.styleable.CustomTheme_gifViewStyle);
}
public GifView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
setViewAttributes(context, attrs, defStyle);
}
@SuppressLint("NewApi")
private void setViewAttributes(Context context, AttributeSet attrs,
int defStyle) {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
setLayerType(View.LAYER_TYPE_SOFTWARE, null);
}
// 从描述文件中读出gif的值,创建出Movie实例
final TypedArray array = context.obtainStyledAttributes(attrs,
R.styleable.GifView, defStyle, R.style.Widget_GifView);
mMovieResourceId = array.getResourceId(R.styleable.GifView_gif, -1);
mPaused = array.getBoolean(R.styleable.GifView_paused, false);
array.recycle();
if (mMovieResourceId != -1) {
mMovie = Movie.decodeStream(getResources().openRawResource(
mMovieResourceId));
}
}
/**
* 设置gif图资源
*
* @param movieResId
*/
public void setMovieResource(int movieResId) {
this.mMovieResourceId = movieResId;
mMovie = Movie.decodeStream(getResources().openRawResource(
mMovieResourceId));
requestLayout();
}
public void setMovie(Movie movie) {
this.mMovie = movie;
requestLayout();
}
/**
* 这里会停在最后一帧
*/
public void stop() {
this.mPaused = true;
//获取最后一帧,主要是为了让动画在设置暂停时停在最后一帧
mCurrentAnimationTime = mMovie.duration();
invalidate();
}
/**
* 开始动画,重第一帧开始
*/
public void start() {
this.mPaused = false;
//获取最后一帧,主要是为了让动画在设置暂停时停在最后一帧
mCurrentAnimationTime = 0;
invalidate();
//开始动画
}
public Movie getMovie() {
return mMovie;
}
public void setMovieTime(int time) {
mCurrentAnimationTime = time;
invalidate();
}
/**
* 设置暂停
*
* @param paused
*/
public void setPaused(boolean paused) {
this.mPaused = paused;
if (!paused) {
mMovieStart = android.os.SystemClock.uptimeMillis() - mCurrentAnimationTime;
}
invalidate();
}
/**
* 判断gif图是否停止了
*
* @return
*/
public boolean isPaused() {
return this.mPaused;
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
if (mMovie != null) {
int movieWidth = mMovie.width();
int movieHeight = mMovie.height();
int maximumWidth = MeasureSpec.getSize(widthMeasureSpec);
float scaleW = (float) movieWidth / (float) maximumWidth;
mScale = 1f / scaleW;
mMeasuredMovieWidth = maximumWidth;
mMeasuredMovieHeight = (int) (movieHeight * mScale);
setMeasuredDimension(mMeasuredMovieWidth, mMeasuredMovieHeight);
} else {
setMeasuredDimension(getSuggestedMinimumWidth(),
getSuggestedMinimumHeight());
}
}
@Override
protected void onLayout(boolean changed, int l, int t, int r, int b) {
super.onLayout(changed, l, t, r, b);
mLeft = (getWidth() - mMeasuredMovieWidth) / 2f;
mTop = (getHeight() - mMeasuredMovieHeight) / 2f;
mVisible = getVisibility() == View.VISIBLE;
}
@Override
protected void onDraw(Canvas canvas) {
if (mMovie != null) {
if (!mPaused) {
updateAnimationTime();
drawMovieFrame(canvas);
invalidateView();
} else {
drawMovieFrame(canvas);
}
}
}
@SuppressLint("NewApi")
private void invalidateView() {
if (mVisible) {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) {
postInvalidateOnAnimation();
} else {
invalidate();
}
}
}
private void updateAnimationTime() {
long now = android.os.SystemClock.uptimeMillis();
// 如果第一帧,记录起始时间
if (mMovieStart == 0) {
mMovieStart = now;
}
// 取出动画的时长
int dur = mMovie.duration();
if (dur == 0) {
dur = DEFAULT_MOVIE_DURATION;
}
// 算出需要显示第几帧
mCurrentAnimationTime = (int) ((now - mMovieStart) % dur);
}
private void drawMovieFrame(Canvas canvas) {
// 设置要显示的帧,绘制即可
mMovie.setTime(mCurrentAnimationTime);
canvas.save(Canvas.MATRIX_SAVE_FLAG);
canvas.scale(mScale, mScale);
mMovie.draw(canvas, mLeft / mScale, mTop / mScale);
canvas.restore();
}
@SuppressLint("NewApi")
@Override
public void onScreenStateChanged(int screenState) {
super.onScreenStateChanged(screenState);
mVisible = screenState == SCREEN_STATE_ON;
invalidateView();
}
@SuppressLint("NewApi")
@Override
protected void onVisibilityChanged(View changedView, int visibility) {
super.onVisibilityChanged(changedView, visibility);
mVisible = visibility == View.VISIBLE;
invalidateView();
}
@Override
protected void onWindowVisibilityChanged(int visibility) {
super.onWindowVisibilityChanged(visibility);
mVisible = visibility == View.VISIBLE;
invalidateView();
}
}
这个类是在别人的博客中找到的,自己又进行一些简单的修改,实现的效果与我用逐帧动画实现的效果一样,但内存由原来的180M降到了14M,简直瞬间感觉app都跑的快了,
在res/attrs中添加如下代码:
<!--gitView-->
<declare-styleable name="GifView">
<attr name="gif" format="reference" />
<attr name="paused" format="boolean" />
</declare-styleable>
<declare-styleable name="CustomTheme">
<attr name="gifViewStyle" format="reference" />
</declare-styleable>
关于这类的使用如下,也是特别简单:
layout.xml
<com.alpha.alphaapp.anim.GifView
android:id="@+id/login_iv_sheep"
android:layout_width="147.5dp"
android:enabled="false"
android:layout_height="match_parent"
/>
MainActvity中的使用
R.raw.animation_sheep_normal
与R.raw.animation_super_normal
就是放置到res/raw的gif图片资源
gif_sheep = (GifView) findViewById(R.id.login_iv_sheep);
gif_super = (GifView) findViewById(R.id.login_iv_super);
gif_sheep.setMovieResource(R.raw.animation_sheep_normal);
gif_super.setMovieResource(R.raw.animation_super_normal);
isStop = false;
//每隔三秒开始播放动画
runnable = new Runnable() {
@Override
public void run() {
//动画
gif_sheep.setPaused(isStop);
gif_super.setPaused(isStop);
isStop=!isStop;
handler.postDelayed(this, 3000);
}
};
handler.postDelayed(runnable, 0);
Stop动画
public void stopNormalAnim() {
gif_sheep.stop();
gif_super.stop();
handler.removeCallbacks(runnable);
}
onDestroy
最后在onDestroy中暂停动画
if(null!=gif_super)
gif_super.setPaused(true);
这篇文章的题目有点与内容不符,但是我们在开发中,不就是实现了效果为主么,实现方式尽可能的简化。希望对大家有帮助。
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