Android 显示GIF图片实例详解gif图动画在Android中还是比较常用的,比如像新浪微博中,有很多gif图片,而且展示非常好,所以我也想弄一个。经过我多方的搜索资料和整理,终于弄出来了,其实GitHub上有很多开源的gif的展示代
Android 显示GIF图片实例详解
gif图动画在Android中还是比较常用的,比如像新浪微博中,有很多gif图片,而且展示非常好,所以我也想弄一个。经过我多方的搜索资料和整理,终于弄出来了,其实GitHub上有很多开源的gif的展示代码,我下载过几个,但是都不是很理想,不是我完全想要的。所以有时候就得自己学会总结,把开源的东西整理成自己的,现在无聊,也正好有朋友需要,所以现在整理了一下,留着以后备用!
废话不多说,直接上图:
在这里主要用的是:android中的android.graphics.Movie 这个类,这是android提供给我们的一个非常方便的工具。
首先,重写控件View,自定义一个展示gif图的GifView,代码如下:
package net.loonggg.gif.view; import net.loonggg.gif.R; 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; public class GifView extends View { 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 GifView(Context context) { this(context, null); } public GifView(Context context, AttributeSet attrs) { this(context, attrs, R.styleable.CustomTheme_gifViewStyle); } public GifView(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); setViewAttributes(context, attrs, defStyle); } @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); } // 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.GifView, defStyle, R.style.Widget_GifView); mMovieResourceId = array.getResourceId(R.styleable.GifView_gif, -1); mPaused = array.getBoolean(R.styleable.GifView_paused, false); array.recycle(); if (mMovieResourceId != -1) { mMovie = Movie.decodeStream(getResources().openRawResource( mMovieResourceId)); } } public void setMovieResource(int movieResId) { this.mMovieResourceId = movieResId; mMovie = Movie.decodeStream(getResources().openRawResource( mMovieResourceId)); requestLayout(); } public void setMovie(Movie movie) { this.mMovie = movie; requestLayout(); } public Movie getMovie() { return mMovie; } public void setMovieTime(int time) { mCurrentAnimationTime = time; invalidate(); } public void setPaused(boolean paused) { this.mPaused = paused; if (!paused) { mMovieStart = android.os.SystemClock.uptimeMillis() - mCurrentAnimationTime; } invalidate(); } 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); } } } @SuppressLint("NewApi") 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(); } @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(); } }
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