Android加载Gif动画实现代码

来源：互联网发布：上古卷轴5 初始python 编辑：程序博客网时间：2024/05/21 13:23

Android加载Gif动画如何实现？相信大家都很好奇，本文就为大家揭晓，内容如下

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<?xmlversion="1.0"encoding="utf-8"?>
<LinearLayoutxmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical"> 
<com.example.gifdemo.GifView
android:id="@+id/gif1"
android:layout_width="100dp"
android:layout_height="100dp"
android:layout_gravity="center_horizontal"
android:enabled="false"/> 
</LinearLayout>

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<declare-styleablename="GifView">
<attrname="gif"format="reference"/> 
<attrname="paused"format="boolean"/> 
</declare-styleable>

主界面

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package com.example.gifdemo; 
import android.app.Activity; 
import android.os.Bundle; 
public class MainActivity extendsActivity { 
privateGifView gif1; 
@Override
publicvoid onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
gif1 = (GifView) findViewById(R.id.gif1);
// 设置背景gif图片资源
gif1.setMovieResource(R.raw.red);
}
} 

自定义view

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package com.example.gifdemo; 
import android.annotation.SuppressLint; 
import android.content.Context; 
import android.content.res.TypedArray; 
import android.graphics.Canvas; 
import android.graphics.Color; 
import android.graphics.Movie; 
import android.os.Build; 
import android.util.AttributeSet; 
import android.view.View; 
public class GifView extendsView { 
/**
* 默认为1秒
*/
privatestatic final int DEFAULT_MOVIE_DURATION = 1000;
privateint mMovieResourceId; 
privateMovie mMovie; 
privatelong mMovieStart; 
privateint mCurrentAnimationTime =0; 
privatefloat mLeft; 
privatefloat mTop; 
privatefloat mScale; 
privateint mMeasuredMovieWidth;
privateint mMeasuredMovieHeight;
privateboolean mVisible = true; 
privatevolatile booleanmPaused = false;
/**
* 构造函数
*/
publicGifView(Context context) { 
this(context,null); 
}
publicGifView(Context context, AttributeSet attrs) { 
this(context, attrs,0);
}
publicGifView(Context context, AttributeSet attrs, intdefStyle) { 
super(context, attrs, defStyle);
setViewAttributes(context, attrs, defStyle);
setBackgroundColor(Color.parseColor("#FFB6C1"));
}
@SuppressLint("NewApi")
privatevoid setViewAttributes(Context context, AttributeSet attrs,
intdefStyle) { 
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
finalTypedArray array = context.obtainStyledAttributes(attrs,
R.styleable.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
*/
publicvoid setMovieResource(intmovieResId) { 
this.mMovieResourceId = movieResId;
mMovie = Movie.decodeStream(getResources().openRawResource(
mMovieResourceId));
requestLayout();
}
@Override
protectedvoid onMeasure(intwidthMeasureSpec, intheightMeasureSpec) { 
if(mMovie != null) {
//gif动画的宽度、高度
intmovieWidth = mMovie.width(); 
intmovieHeight = mMovie.height(); 
//控件的宽度
intmaximumWidth = MeasureSpec.getSize(widthMeasureSpec); 
//gif图片宽/控件宽
floatscaleW = (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
protectedvoid onDraw(Canvas canvas) {
if(mMovie != null) {
if(!mPaused) { 
updateAnimationTime();
drawMovieFrame(canvas);
invalidateView();
}else { 
drawMovieFrame(canvas);
}
}
}
privatevoid updateAnimationTime() {
longnow = 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
intdur = mMovie.duration(); 
if(dur == 0) {
dur = DEFAULT_MOVIE_DURATION;
}
// 算出需要显示第几帧
mCurrentAnimationTime = (int) ((now - mMovieStart) % dur);
}
privatevoid 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")
privatevoid invalidateView() {
if(mVisible) { 
if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) {
postInvalidateOnAnimation();
}else { 
invalidate();
}
}
}
// --------------------以下方法未调用------------------------------------/
publicvoid setMovie(Movie movie) {
this.mMovie = movie;
requestLayout();
}
publicMovie getMovie() { 
returnmMovie; 
}
publicvoid setMovieTime(inttime) { 
mCurrentAnimationTime = time;
invalidate();
}
publicvoid setPaused(booleanpaused) { 
this.mPaused = paused;
if(!paused) { 
mMovieStart = android.os.SystemClock.uptimeMillis()
- mCurrentAnimationTime;
}
invalidate();
}
publicboolean isPaused() { 
returnthis.mPaused; 
}
@SuppressLint("NewApi")
@Override
publicvoid onScreenStateChanged(intscreenState) { 
super.onScreenStateChanged(screenState);
mVisible = screenState == SCREEN_STATE_ON;
invalidateView();
}
@SuppressLint("NewApi")
@Override
protectedvoid onVisibilityChanged(View changedView,int visibility) {
super.onVisibilityChanged(changedView, visibility);
mVisible = visibility == View.VISIBLE;
invalidateView();
}
@Override
protectedvoid onWindowVisibilityChanged(intvisibility) { 
super.onWindowVisibilityChanged(visibility);
mVisible = visibility == View.VISIBLE;
invalidateView();
}
// --------------------------------------------------------/
}

源码下载：http://xiazai.jb51.net/201610/yuanma/AndroidGifDemo(jb51.net).rar

本文由微信妈妈(公众号买卖ontaobao.cn) 编辑，转载于 http://www.jb51.net/article/96149.htm

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