Android下载并显示GIF图
来源：程序员人生 发布时间：2015-05-05 08:30:03 阅读次数：3027次
最近项目需要实现在线加载GIF图的功能，因而我在网上翻了1番，发现有个开源项目（android-gif-drawable）可以很好的支持GIF动态图的显示。而且它的底层解码使用C实现，极大的提高了解码效力，同时很大程度上避免了OOM现象出现。
这篇文章主要是展现如何使用该项目的Demo，以备不时之需。
Demo内容：通过URL下载图片，并且判断是不是是gif图片，显示图片。
布局文件：
<RelativeLayout 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:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.example.testgif.MainActivity" >
<pl.droidsonroids.gif.GifImageView
android:id="@+id/myGifView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="#ffffff"
android:src="@drawable/ic_launcher" />
</RelativeLayout>
Activity代码：
package com.example.test;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import pl.droidsonroids.gif.GifDrawable;
import pl.droidsonroids.gif.GifImageView;
import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Movie;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.Environment;
import android.util.Log;
import android.view.Menu;
public class MainActivity extends Activity {
// protected static final String IMAGE_URL = "http://img.blog.csdn.net/20150410135837339";
protected static final String IMAGE_URL ="http://img.blog.csdn.net/20150310123909933";
protected static final String TAG = "MainActivity";
private GifImageView myGifImageView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
myGifImageView = (GifImageView) findViewById(R.id.myGifView);
new AsyncTask<Void, Void, byte[]>() {
@Override
protected byte[] doInBackground(Void... params) {
byte[] gifbyte = null;
HttpURLConnection conn = null;
try {
URL url = new URL(IMAGE_URL);
conn = (HttpURLConnection) url.openConnection();
ByteArrayOutputStream out = new ByteArrayOutputStream();
InputStream in = conn.getInputStream();
if (conn.getResponseCode() != HttpURLConnection.HTTP_OK) {
// 连接不成功
Log.i(TAG, "连接不成功");
return null;
}
byte[] buffer = new byte[1024];
int len = 0;
while ((len = in.read(buffer)) > 0) {
out.write(buffer, 0, len);
}
gifbyte = out.toByteArray();
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
conn.disconnect();
}
// 写入文件
/*
* FileOutputStream fos = null; try {
*
* File root = Environment.getExternalStorageDirectory(); File
* myFile = new File(root, "test.jpg"); Log.v(TAG,
* myFile.getAbsolutePath()); fos = new
* FileOutputStream(myFile); fos.write(gifbyte); } catch
* (FileNotFoundException e) { e.printStackTrace(); } catch
* (IOException e) { e.printStackTrace(); } finally { if (fos !=
* null) { try { fos.close(); } catch (IOException e) {
*
* e.printStackTrace(); } } }
*/
return gifbyte;
}
protected void onPostExecute(byte[] gifbyte) {
// 判断是不是是gif图
Movie gif = Movie.decodeByteArray(gifbyte, 0, gifbyte.length);
if (gif != null) {
Log.v(TAG, "是gif图片");
GifDrawable gifDrawable = null;
try {
gifDrawable = new GifDrawable(gifbyte);
} catch (IOException e) {
e.printStackTrace();
}
myGifImageView.setImageDrawable(gifDrawable);
} else {
Bitmap gifBitmap = BitmapFactory.decodeByteArray(gifbyte,
0, gifbyte.length);
myGifImageView.setImageBitmap(gifBitmap);
}
};
}.execute();
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
}
PS：下载它的开源库，好像需要翻墙，不方便的同学可以直接从Demo中拿。
Demo：https://github.com/mandmLeee/GifDemo
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