Android 显示Gif 动态图片

项目(showgif)已推到GitHub，查看文末的链接即可下载。

显示如下一张Gif动态图片：

看一下在demo中的效果：

按钮用来暂停和继续。看一下代码逻辑实现：

package com.zms.showgif;

import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;


public class Main extends ActionBarActivity {
    private GifImageView gifImageView;
    private Button btnPause;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        gifImageView = (GifImageView) findViewById(R.id.imgGif);
        gifImageView.setMovieResource(R.raw.showme);
        btnPause = (Button) findViewById(R.id.btnPause);
        btnPause.setOnClickListener(new OnClickListenerImp());
    }

    private class OnClickListenerImp implements View.OnClickListener {
        @Override
        public void onClick(View v) {
            if (v == btnPause) {
                if (gifImageView.isPaused()) {
                    gifImageView.setPaused(false);
                    btnPause.setText("Pause");
                } else {
                    gifImageView.setPaused(true);
                    btnPause.setText("Play");
                }
            }
        }
    }


    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        int id = item.getItemId();
        if (id == R.id.action_settings) {
            return true;
        }
        return super.onOptionsItemSelected(item);
    }
}

package com.zms.showgif;

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;

/**
 * Created by AlexZhou on 2015/1/29.
 * 16:42
 */
public class GifImageView extends View {

    // 默认为1秒
    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;

    public GifImageView(Context context) {
        this(context, null);
    }

    public GifImageView(Context context, AttributeSet attrs) {
        this(context, attrs, R.styleable.Gif_style);
    }

    public GifImageView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        setViewAttributes(context, attrs, defStyle);
    }

    private void setViewAttributes(Context context, AttributeSet attrs,
                                   int defStyle) {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
            setLayerType(View.LAYER_TYPE_SOFTWARE, null);
        }
        // 从描述文件中读出gif的值，创建出Movie实例
        final TypedArray array = context.obtainStyledAttributes(attrs,
                R.styleable.Gif, defStyle, -1);
        mMovieResourceId = array.getResourceId(R.styleable.Gif_resource, -1);
        mPaused = array.getBoolean(R.styleable.Gif_paused, false);
        array.recycle();
        if (mMovieResourceId != -1) {
            mMovie = Movie.decodeStream(getResources().openRawResource(
                    mMovieResourceId));
        }
    }

    public int setMovieResource(int movieResId) {
        this.mMovieResourceId = movieResId;
        mMovie = Movie.decodeStream(getResources().openRawResource(
                mMovieResourceId));
        requestLayout();
        return movieResId;
    }

    public void setMovie(Movie movie) {
        this.mMovie = movie;
        requestLayout();
    }

    public Movie getMovie() {
        return mMovie;
    }

    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);
            }
        }
    }

    private void invalidateView() {
        if (mVisible) {
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) {
                postInvalidateOnAnimation();
            } else {
                invalidate();
            }
        }
    }

    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);
    }

    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();
    }

    @Override
    public void onScreenStateChanged(int screenState) {
        super.onScreenStateChanged(screenState);
        mVisible = screenState == SCREEN_STATE_ON;
        invalidateView();
    }

    @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();
    }
}

转载请注明出处：周木水的CSDN博客 http://blog.csdn.net/zhoumushui

我的GitHub：周木水的GitHub https://github.com/zhoumushui