Android loaded GIF animation implementation code _android

How does an Android loaded GIF animation work? I believe we are all very curious, this article will be announced for you, the contents are as follows

<?xml version= "1.0" encoding= "Utf-8"?> <linearlayout xmlns:android= 
"http://schemas.android.com/apk/" Res/android " 
 android:layout_width=" fill_parent " 
 android:layout_height=" fill_parent " 
 android:o" rientation= "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>

 <declare-styleable name= "Gifview" > 
 <attr name= "gif" format= "reference"/> <attr "name=" 
 Paused "format=" boolean "/> 
 </declare-styleable> 

Main interface

Package Com.example.gifdemo; 
 
Import android.app.Activity; 
Import Android.os.Bundle; 
 
public class Mainactivity extends activity { 
 private gifview gif1; 
 
 @Override public 
 void OnCreate (Bundle savedinstancestate) { 
 super.oncreate (savedinstancestate); 
 Setcontentview (r.layout.activity_main); 
 GIF1 = (Gifview) Findviewbyid (R.ID.GIF1); 
 Set background gif picture resource 
 gif1.setmovieresource (r.raw.red); 
 } 
 
 

customizing view

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 extends View {/** * defaults to 1 seconds * * * private static final int default_movie_duration = 1000; 
 
 private int Mmovieresourceid; 
 
 Private Movie Mmovie; 
 
 Private long Mmoviestart; 
 
 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; 
 /** * Constructor/public Gifview {This (context, NULL); 
 Public Gifview (context, AttributeSet attrs) {This (context, attrs,0); } public Gifview (context, AttributeSet attrs, int defstyle) {Super (context, attrs, Defstyle); 
 Setviewattributes (context, attrs, Defstyle); 
 SetBackgroundColor (Color.parsecolor ("#FFB6C1"));  @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); 
 //Read the GIF value from the description file to create a movie instance final TypedArray 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)); 
 }/** * Set GIF map resource */public void Setmovieresource (int movieresid) {This.mmovieresourceid = Movieresid; Mmovie = Movie.decodestream (Getresources (). openrawreSource (Mmovieresourceid)); 
 Requestlayout (); @Override protected void onmeasure (int widthmeasurespec, int heightmeasurespec) {if (Mmovie!= null) {//gif move 
 The width of the painting, the height int moviewidth = mmovie.width (); 
 int movieheight = Mmovie.height (); 
 The width of the control int maximumwidth = Measurespec.getsize (Widthmeasurespec); 
 GIF picture width/control wide 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 (change 
D, 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); 
 }} private void Updateanimationtime () {Long now = Android.os.SystemClock.uptimeMillis (); 
 If the first frame, record starting time if (Mmoviestart = = 0) {Mmoviestart = now; 
 ///Remove the animation when the length int dur = Mmovie.duration (); 
 if (dur = = 0) {dur = default_movie_duration; 
 Mcurrentanimationtime = (int) ((now-mmoviestart)% dur) required to display the first few frames; 
 private void Drawmovieframe (Canvas Canvas) {//Set the frame to be displayed, Draw Mmovie.settime (mcurrentanimationtime); 
 Canvas.save (Canvas.matrix_save_flag); 
 Canvas.scale (Mscale, Mscale); 
 Mmovie.draw (Canvas, Mleft/mscale, Mtop/mscale); 
 Canvas.restore (); @SuppressLint ("Newapi") private void Invalidateview () {if (mvisible) {if (Build.VERSION.SDK_INT >= Buil D.version_codes. 
 Jelly_bean) {postinvalidateonanimation (); else {invalidate (); 
 The following methods did not call------------------------------------/public void Setmovie (Movie mo 
 VIE) {This.mmovie = movie; 
 Requestlayout (); 
 Public Movie Getmovie () {return mmovie; 
 public void Setmovietime (int time) {mcurrentanimationtime = time; 
 Invalidate (); 
 } public void Setpaused (Boolean paused) {this.mpaused = paused; 
 if (!paused) {Mmoviestart = Android.os.SystemClock.uptimeMillis ()-mcurrentanimationtime; 
 } invalidate (); 
 public Boolean ispaused () {return this.mpaused; @SuppressLint ("Newapi") @Override public void onscreenstatechanged (int screenstate) {Super.onscreenstatechang 
 Ed (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 ();  } 
 // --------------------------------------------------------/ 
}

SOURCE Download: Http://xiazai.jb51.net/201610/yuanma/AndroidGifDemo (jb51.net). rar

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