Android中使用Movie显示gif动态图

转载请注明：
http://blog.csdn.net/u012975705/article/details/48717391
在看这篇博文之前对attr自定义属性还是不是很熟的童鞋可以先看看：Android中attr详解（http://blog.csdn.net/u012975705/article/details/48716797）
源码下载：https://github.com/noyo/GifTest

效果图

显示的事两张动态gif图

实现代码

1、布局activity_main.xml

<?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"    xmlns:gif="http://schemas.android.com/apk/res-auto"    android:gravity="center"    android:orientation="vertical" >    <com.practice.noyet.giftest.MyGiftView        android:id="@+id/gif1"        gif:gif="@raw/gift1"        android:layout_width="150dp"        android:layout_height="150dp"        android:layout_gravity="center_horizontal"        android:enabled="false" />    <com.practice.noyet.giftest.MyGiftView        android:layout_marginTop="10dp"        gif:gif="@raw/gift2"        android:id="@+id/gif2"        android:layout_width="150dp"        android:layout_height="150dp"        android:layout_gravity="center_horizontal"        android:enabled="false" />LinearLayout>

2、自定义的com.practice.noyet.giftest.MyGiftView.java代码（代码中都有注释，我就不废话了）：

package com.practice.noyet.giftest;import android.annotation.SuppressLint;import android.content.Context;import android.content.res.TypedArray;import android.graphics.Canvas;import android.graphics.Movie;import android.os.Build;import android.util.AttributeSet;import android.view.View;import java.io.ByteArrayOutputStream;import java.io.IOException;import java.io.InputStream;/** * Created by noyet on 2015/9/24. */public class MyGiftView extends View {    /** gift动态效果总时长，在未设置时长时默认为1秒 */    private static final int DEFAULT_MOVIE_DURATION = 1000;    /** gift图片资源ID */    private int mGiftId;    /** Movie实例，用来显示gift图片 */    private Movie mMovie;    /** 显示gift图片的动态效果的开始时间 */    private long mMovieStart;    /** 动态图当前显示第几帧 */    private int mCurrentAnimationTime = 0;    /** 图片离屏幕左边的距离 */    private float mLeft;    /** 图片离屏幕上边的距离 */    private float mTop;    /** 图片的缩放比例 */    private float mScale;    /** 图片在屏幕上显示的宽度 */    private int mMeasuredMovieWidth;    /** 图片在屏幕上显示的高度 */    private int mMeasuredMovieHeight;    /** 是否显示动画,为true表示显示，false表示不显示 */    private boolean mVisible = true;    /** 动画效果是否被暂停 */    private volatile boolean mPaused = false;    public MyGiftView(Context context) {        this(context, null);    }    public MyGiftView(Context context, AttributeSet attrs) {        this(context, attrs, R.styleable.CustomTheme_gifViewStyle);    }    public MyGiftView(Context context, AttributeSet attrs, int defStyleAttr) {        super(context, attrs, defStyleAttr);        setViewAttributes(context, attrs, defStyleAttr);    }    /**     *     * @param context 上下文     * @param attrs 自定义属性     * @param defStyle 默认风格     */    @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);        }        final TypedArray array = context.obtainStyledAttributes(attrs,                R.styleable.MyGiftView, defStyle, R.style.Widget_MyGiftView);        mGiftId = array.getResourceId(R.styleable.MyGiftView_gif, -1);        mPaused = array.getBoolean(R.styleable.MyGiftView_paused, false);        array.recycle();        if (mGiftId != -1) {            byte[] bytes = getGiftBytes();            mMovie = Movie.decodeByteArray(bytes, 0, bytes.length);        }    }    /**     * 设置gif图资源     * @param giftResId     */    public void setMovieResource(int giftResId) {        this.mGiftId = giftResId;        byte[] bytes = getGiftBytes();        mMovie = Movie.decodeByteArray(bytes, 0, bytes.length);        requestLayout();    }    /**     * 手动设置 Movie对象     * @param movie Movie     */    public void setMovie(Movie movie) {        this.mMovie = movie;        requestLayout();    }    /**     * 得到Movie对象     * @return Movie     */    public Movie getMovie() {        return mMovie;    }    /**     * 设置要显示第几帧动画     * @param time     */    public void setMovieTime(int time) {        mCurrentAnimationTime = time;        invalidate();    }    /**     * 设置暂停     *     * @param paused     */    public void setPaused(boolean paused) {        this.mPaused = paused;        if (!paused) {            mMovieStart = android.os.SystemClock.uptimeMillis()                    - mCurrentAnimationTime;        }        invalidate();    }    /**     * 判断gif图是否停止了     *     * @return     */    public boolean isPaused() {        return this.mPaused;    }    @Override    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {        if (mMovie != null) {            int movieWidth = mMovie.width();            int movieHeight = mMovie.height();            int maximumWidth = MeasureSpec.getSize(widthMeasureSpec);            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(changed, 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);            }        }    }    /**     * 重绘     */    @SuppressLint("NewApi")    private void invalidateView() {        if (mVisible) {            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) {                postInvalidateOnAnimation();            } else {                invalidate();            }        }    }    /**     * 更新当前显示进度     */    private void updateAnimationTime() {        long now = 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        int dur = mMovie.duration();        if (dur == 0) {            dur = DEFAULT_MOVIE_DURATION;        }        // 算出需要显示第几帧        mCurrentAnimationTime = (int) ((now - mMovieStart) % dur);    }    /**     * 绘制图片     * @param canvas 画布     */    private void 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")    @Override    public void onScreenStateChanged(int screenState) {        super.onScreenStateChanged(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();    }    /**     * 将gif图片转换成byte[]     * @return byte[]     */    private byte[] getGiftBytes() {        ByteArrayOutputStream baos = new ByteArrayOutputStream();        InputStream is = getResources().openRawResource(mGiftId);        byte[] b = new byte[1024];        int len;        try {            while ((len = is.read(b, 0, 1024)) != -1) {                baos.write(b, 0, len);            }            baos.flush();        } catch (IOException e) {            e.printStackTrace();        } finally {            if (is != null) {                try {                    is.close();                } catch (IOException e) {                    e.printStackTrace();                }            }        }        return baos.toByteArray();    }}

3、MainActivity.java：

package com.practice.noyet.giftest;import android.app.Activity;import android.os.Bundle;public class MainActivity extends Activity {    private MyGiftView gif1;    private MyGiftView gif2;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        gif1 = (MyGiftView) findViewById(R.id.gif1);        gif2 = (MyGiftView) findViewById(R.id.gif2);        /** ........ */    }}

效果图

实现代码

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