Android显示GIF图片实例代码

public class GifView 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 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));  }  }  /**  * 设置gif图资源  *  * @param movieResId  */  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();  }  /**  * 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);   }  }  }  @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();  }  } 

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"   android:layout_width="fill_parent"   android:layout_height="fill_parent"   android:background="#ffffff"   android:gravity="center"   android:orientation="vertical"  >   <com.example.alarmtest.GifView  android:id="@+id/gif1"  android:layout_width="300dp"  android:layout_height="300dp"  android:layout_gravity="center_horizontal"  android:enabled="false"/>  <Button  android:id="@+id/bu"  android:text="进入"  android:layout_width="wrap_content"  android:layout_height="wrap_content"  android:layout_gravity="center_horizontal"/>  </LinearLayout> 

public class FirstActivity extends Activity {  private GifView gif;  @Override  protected void onCreate(Bundle savedInstanceState) {  super.onCreate(savedInstanceState);  setContentView(R.layout.activity_first);  gif = (GifView) findViewById(R.id.gif1);  // 设置背景gif图片资源  gif.setMovieResource(R.raw.a123);  } } 

<declare-styleable name="GifView">  <attr name="gif" format="reference" />  <attr name="paused" format="boolean" />  </declare-styleable>  <declare-styleable name="CustomTheme">  <attr name="gifViewStyle" format="reference" />  </declare-styleable>  <style name="Widget_GifView"></style>