Android显示GIF图片实例代码-优快云博客

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