Load animated GIF from Internet

Previous examples show how to diaply animated GIF using decodeStream(InputStream) and decodeByteArray(InputStream) loaded from  /res/drawable/ folder. This example show how to load from Internet.



  • We cannot access Internet in main thread, such that we have to implement a background thread to load the gif from Internet.
  • Once loaded, we have to ask Android system to re-layout with updated graph.
  • In the example code, dummy delay is added to simulate network delay.
  • Both decodeStream(InputStream) and decodeByteArray(InputStream) are implemented, you can choice it by setting DECODE_STREAM true or false.
  • It can be noted that textViewInfo is filled with 0, 0 x 0; because the GIF is not loaded when onCreate() called.
  • uses-permission android:name="android.permission.INTERNET" is needed in AndroidManifest.xml
Modify activity_main.xml to added a LinearLayout to show how the system layout at run-time.
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context="com.example.androidgif.MainActivity" >

<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:autoLink="web"
android:text="http://arteluzevida.blogspot.com/"
android:textStyle="bold" />

<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal" >

<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/android_er" />

<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="#ff000090"
android:orientation="vertical"
android:padding="5dp" >

<com.example.androidgif.GifView
android:id="@+id/gifview"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</LinearLayout>
</LinearLayout>

<TextView
android:id="@+id/textinfo"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="info..." />

</LinearLayout>

GifView.java
package com.example.androidgif;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Movie;
import android.util.AttributeSet;
import android.view.View;
import android.widget.Toast;

public class GifView extends View {

//Set true to use decodeStream
//Set false to use decodeByteArray
private static final boolean DECODE_STREAM = true;

private InputStream gifInputStream;
private Movie gifMovie;
private int movieWidth, movieHeight;
private long movieDuration;
private long mMovieStart;

final static String gifAddr = "http://3.bp.blogspot.com/-aO7sI_xlx-0/Uyhbv6BB4DI/AAAAAAAAKzg/RfKWKzg7O-M/s1600/android_er.gif";

public GifView(Context context) {
super(context);
init(context);
}

public GifView(Context context, AttributeSet attrs) {
super(context, attrs);
init(context);
}

public GifView(Context context, AttributeSet attrs,
int defStyleAttr) {
super(context, attrs, defStyleAttr);
init(context);
}

private void init(final Context context){
setFocusable(true);

gifMovie = null;
movieWidth = 0;
movieHeight = 0;
movieDuration = 0;

Thread threadLoadGif = new Thread(new Runnable(){

@Override
public void run() {
try {
URL gifURL = new URL(gifAddr);

HttpURLConnection connection = (HttpURLConnection)gifURL.openConnection();
gifInputStream = connection.getInputStream();

//Insert dummy sleep
//to simulate network delay
try {
Thread.sleep(3000);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}

if(DECODE_STREAM){
gifMovie = Movie.decodeStream(gifInputStream);
}else{
byte[] array = streamToBytes(gifInputStream);
gifMovie = Movie.decodeByteArray(array, 0, array.length);
}

movieWidth = gifMovie.width();
movieHeight = gifMovie.height();
movieDuration = gifMovie.duration();

((MainActivity)context).runOnUiThread(new Runnable(){

@Override
public void run() {
//request re-draw layout
invalidate();
requestLayout();
Toast.makeText(context,
movieWidth + " x " + movieHeight + "\n"
+ movieDuration,
Toast.LENGTH_LONG).show();
}});

} catch (MalformedURLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}});

threadLoadGif.start();

}

private static byte[] streamToBytes(InputStream is) {
ByteArrayOutputStream os = new ByteArrayOutputStream(1024);
byte[] buffer = new byte[1024];
int len;
try {
while ((len = is.read(buffer)) >= 0) {
os.write(buffer, 0, len);
}
} catch (java.io.IOException e) {
}
return os.toByteArray();
}

@Override
protected void onMeasure(int widthMeasureSpec,
int heightMeasureSpec) {
setMeasuredDimension(movieWidth, movieHeight);
}

public int getMovieWidth(){
return movieWidth;
}

public int getMovieHeight(){
return movieHeight;
}

public long getMovieDuration(){
return movieDuration;
}

@Override
protected void onDraw(Canvas canvas) {

long now = android.os.SystemClock.uptimeMillis();
if (mMovieStart == 0) { // first time
mMovieStart = now;
}

if (gifMovie != null) {

int dur = gifMovie.duration();
if (dur == 0) {
dur = 1000;
}

int relTime = (int)((now - mMovieStart) % dur);

gifMovie.setTime(relTime);

gifMovie.draw(canvas, 0, 0);
invalidate();

}

}

}

Other files, MainActivity.java and AndroidManifest.xml to turn OFF hardwareAccelerated, refer to the post "Play animated GIF using android.graphics.Movie, with Movie.decodeStream(InputStream)".

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