Android显示GIF图片实例代码

最近.一个朋友跟我说想,我给她弄个闹钟APP软件...功能其实很简单...只需要弄个简单的闹钟.自己设计设计时间.然后时间到了的时候,闹铃放的声音是男朋友录制好的声音...于是就开始整了....

第一次做这种的时候.我想把首页界面做成一个GIF动画特效的.这样看起来可爱点...适合妹子用,于是就有了下面这个效果图

上代码

ndroid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
Movie其实管理着GIF动画中的多个帧，只需要通过 setTime() 一下就可以让它在draw()的时候绘出相应的那帧图像。通过当前时间与duration之间的换算关系，是很容易实现GIF动起来的效果。

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();
 } 

}

其次，在xml布局文件中，把这个view定义进去，代码如下：

<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> 

最后，在MainActivity中的使用，代码如下：

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);
 }
}

Styles.xml

<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> 

raw是res下面的一个文件放的是GIF动画图噢

我这里放了一个动画图 跟一个 音乐文件,因为我要做的是一个有声音的闹铃

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