android实现Gif播放

实现内容是：在android实现Gif播放，原理是自定义View，然后在自定view用Movie类实现Gif画在canvas中来播放Movie中的图片。

内容：提供播放和暂停功能

注意事项：在注册表对应的Activity中要android:hardwareAccelerated="false"，就是说不要利用硬件加速，原理参考：http://blog.youkuaiyun.com/yarkey09/article/details/13022387

package com.example.myViews;

import java.io.InputStream;

import android.annotation.SuppressLint;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Movie;
import android.os.SystemClock;
import android.util.AttributeSet;
import android.util.Log;
import android.widget.ImageView;
/**
 * 
 * @author lxq
 * @version 1.0
 * @category 实现自定义播放Gif
 *
 */
public class GifImageView extends ImageView {
	private Movie movie;
	private boolean isPlaying=false; //表示正在播放
	private int with=0;
	private int height=0;
	private long currentTime=0;
	private long preTime=0;
	private boolean haveGif=false;
	private long pausePage=0;
	private long currentPage=0;
	private boolean is_init=false;
	public GifImageView(Context context) {
		super(context);
		// TODO Auto-generated constructor stub
	}

	public GifImageView(Context context, AttributeSet attrs) {
		super(context, attrs);
		// TODO Auto-generated constructor stub
	}

	public GifImageView(Context context, AttributeSet attrs, int defStyle) {
		super(context, attrs, defStyle);
		// TODO Auto-generated constructor stub
	}
	
	@Override
	protected void onDraw(Canvas canvas) {
		if(!haveGif) super.onDraw(canvas);
		else if(movie!=null){
			if(is_init){
				movie.setTime(0);
				movie.draw(canvas, 0, 0);
				is_init=false;
			}
			else{
				if(isPlaying){
					if(!playMovie(canvas)){
						pausePage=0;
						currentPage=0;
						isPlaying=false;
						is_init=true;
					}
					invalidate();
				}
				else{
					playMovie(canvas);
				}
			}
		}
		
	}
	
	@Override
	protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
		// TODO Auto-generated method stub
		if(movie!=null){
			setMeasuredDimension(with, height);
		}
		else{
			super.onMeasure(widthMeasureSpec, heightMeasureSpec);
		}
	}
	
	public void startGif(){
		if(isPlaying==true) return;
		isPlaying=true;
		invalidate();
	}
	
	public void pauseGif(){
		if(isPlaying==false) return;
		isPlaying=false;
		invalidate();
	}
	/**
	 * 
	 * @param canvas
	 * @return false means playing movie is end 
	 * 
	 */
	public boolean playMovie(Canvas canvas){
		currentTime=SystemClock.uptimeMillis();
		if(preTime==0){
			preTime=currentTime;
		}
		int time=(int)((currentTime-preTime)%movie.duration());
		time=(int)((time+pausePage));
		if(time>=movie.duration()){
			return false;
		}
		else{
			movie.setTime(time);
			movie.draw(canvas, 0, 0);
			//invalidate();
			return true;
		}
	}
	/**
	 * 
	 * @param is
	 * @throws NullPointerException
	 * 
	 */
	public void setGif(InputStream is) throws NullPointerException{
		
		if(is!=null){	
			movie=Movie.decodeStream(is);
			if(movie!=null){
				haveGif=true;
				Bitmap bitmap=BitmapFactory.decodeStream(is);
				if(bitmap!=null){
					
					with=bitmap.getWidth();
					height=bitmap.getHeight();
					
					Log.e("with="+with+",height="+height,"...........");
					bitmap.recycle();
				}
				else{
					Log.e("bitmap=null","..............");
				}
				/*
				with=302;
				height=220;*/
				haveGif=true;
				is_init=true;
				//setMeasuredDimension(with, height);
				requestLayout();
				//invalidate();
			}
			
		}
		else {
			throw new NullPointerException("no find inputSteam");
		}
	}
	public void setWithAndHeight(int w,int h){
		with=w;
		height=h;
	}

}

package com.example.activities;

import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;

import android.content.ContentResolver;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.net.Uri;
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;

import com.example.gifandroid.R;


public class MainActivity extends ActionBarActivity {
	com.example.myViews.GifImageView gifImg;
	Button start_bn;
	Button pause_bn;
	InputStream is;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        initView();
        
    }
    void initView(){
    	 gifImg=(com.example.myViews.GifImageView)findViewById(R.id.gifImageView);
    	 try {
				is=MainActivity.this.getAssets().open("anim.gif");
			} catch (IOException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
		}
    	 gifImg.setGif(is);
    	 start_bn=(Button)findViewById(R.id.start);
    	 pause_bn=(Button)findViewById(R.id.pause);
    	 gifImg.setOnClickListener(new OnClickListener() {
			
			@Override
			public void onClick(View arg0) {
				// TODO Auto-generated method stub
				 Intent intent = new Intent();  
	             /* 开启Pictures画面Type设定为image */  
	             intent.setType("image/*");  
	             /* 使用Intent.ACTION_GET_CONTENT这个Action */  
	             intent.setAction(Intent.ACTION_GET_CONTENT);   
	             /* 取得相片后返回本画面 */  
	             startActivityForResult(intent, 1); 
			}
		});
    	 start_bn.setOnClickListener(new OnClickListener() {
			
			@Override
			public void onClick(View arg0) {
				// TODO Auto-generated method stub
				gifImg.startGif();
			}
		});
    	 pause_bn.setOnClickListener(new OnClickListener() {
			
			@Override
			public void onClick(View arg0) {
				// TODO Auto-generated method stub
				gifImg.pauseGif();
			}
		});
    	
    }
    
    @Override  
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {  
        if (resultCode == RESULT_OK) {  
            Uri uri = data.getData();  
            Log.e("uri", uri.toString());  
            ContentResolver cr = this.getContentResolver();  
            try {  
            	is=cr.openInputStream(uri);
            	if(is==null){
            		Toast.makeText(MainActivity.this, "Main_is==null",Toast.LENGTH_LONG).show();
            		Log.e("Main_is==null","..........");
            	}
            	else{
            		Toast.makeText(MainActivity.this, "Main_is!=null",Toast.LENGTH_LONG).show();
            		Log.e("main_is!=null","..........");
            	}
            	Bitmap bitmap=BitmapFactory.decodeStream(cr.openInputStream(uri));
				if(bitmap!=null){
					
					int with=bitmap.getWidth();
					int height=bitmap.getHeight();
					Log.e("bitmap_with="+with+",height="+height,"...........");
					bitmap.recycle();
				}
				gifImg.setWithAndHeight(300, 300);
            	gifImg.setGif(is);
            	//gifImg.setBackground(new BitmapDrawable(BitmapFactory.decodeStream(is)));
            	//gifImg.setImageBitmap(BitmapFactory.decodeStream(is));
            } catch (FileNotFoundException e) {  
                Log.e("Exception", e.getMessage(),e);  
            }  
        }  
        super.onActivityResult(requestCode, resultCode, data);  
    }  

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();
        if (id == R.id.action_settings) {
            return true;
        }
        return super.onOptionsItemSelected(item);
    }
}

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.gifandroid"
    android:versionCode="1"
    android:versionName="1.0"
    
     >
    <uses-sdk
        android:minSdkVersion="16"
        android:targetSdkVersion="21" />
    <uses-permission 
        android:name="android.permission.MOUNT_FORMAT_FILESYSTEMS"
        />
    <uses-permission 
        android:name="android.permission.WRITE_EXTERNAL_STORAGE"
        />
    <uses-permission 
        android:name="android.permission.READ_EXTERNAL_STORAGE"
        />
    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.example.activities.MainActivity"
            android:label="@string/app_name"
            android:hardwareAccelerated="false"
             >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

源码下载