Android顯示GIF圖片實(shí)例代碼

更新時(shí)間：2018年05月09日 11:56:01 作者：poclist

這篇文章主要介紹了Android顯示GIF圖片實(shí)例代碼，小編覺(jué)得挺不錯(cuò)的，現(xiàn)在分享給大家，也給大家做個(gè)參考。一起跟隨小編過(guò)來(lái)看看吧

最近.一個(gè)朋友跟我說(shuō)想,我給她弄個(gè)鬧鐘APP軟件...功能其實(shí)很簡(jiǎn)單...只需要弄個(gè)簡(jiǎn)單的鬧鐘.自己設(shè)計(jì)設(shè)計(jì)時(shí)間.然后時(shí)間到了的時(shí)候,鬧鈴放的聲音是男朋友錄制好的聲音...于是就開(kāi)始整了....

第一次做這種的時(shí)候.我想把首頁(yè)界面做成一個(gè)GIF動(dòng)畫(huà)特效的.這樣看起來(lái)可愛(ài)點(diǎn)...適合妹子用,于是就有了下面這個(gè)效果圖

上代碼

ndroid中的Android.graphics.Movie 這個(gè)類(lèi)，這是android提供給我們的一個(gè)非常方便的工具。
首先，重寫(xiě)控件View,自定義一個(gè)展示gif圖的GifView
Movie其實(shí)管理著GIF動(dòng)畫(huà)中的多個(gè)幀，只需要通過(guò) setTime() 一下就可以讓它在draw()的時(shí)候繪出相應(yīng)的那幀圖像。通過(guò)當(dāng)前時(shí)間與duration之間的換算關(guān)系，是很容易實(shí)現(xiàn)GIF動(dòng)起來(lái)的效果。

public class GifView extends View { 
 /** 
 * 默認(rèn)為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); 
 } 
 // 從描述文件中讀出gif的值，創(chuàng)建出Movie實(shí)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)); 
 } 
 } 
 /** 
 * 設(shè)置gif圖資源 
 * 
 * @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(); 
 } 
 /** 
 * 設(shè)置暫停 
 * 
 * @param paused 
 */ 
 public void setPaused(boolean paused) { 
 this.mPaused = paused; 
 if (!paused) { 
  mMovieStart = android.os.SystemClock.uptimeMillis() 
   - mCurrentAnimationTime; 
 } 
 invalidate(); 
 } 
 /** 
 * 判斷gif圖是否停止了 
 * 
 * @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(); 
 // 如果第一幀，記錄起始時(shí)間 
 if (mMovieStart == 0) { 
  mMovieStart = now; 
 } 
 // 取出動(dòng)畫(huà)的時(shí)長(zhǎng) 
 int dur = mMovie.duration(); 
 if (dur == 0) { 
  dur = DEFAULT_MOVIE_DURATION; 
 } 
 // 算出需要顯示第幾幀 
 mCurrentAnimationTime = (int) ((now - mMovieStart) % dur); 
 } 
 private void drawMovieFrame(Canvas canvas) { 
 // 設(shè)置要顯示的幀，繪制即可 
 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，把這個(gè)view定義進(jìn)去，代碼如下：

<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="進(jìn)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，代碼如下：

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); 
 // 設(shè)置背景gif圖片資源 
 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下面的一個(gè)文件放的是GIF動(dòng)畫(huà)圖噢

我這里放了一個(gè)動(dòng)畫(huà)圖跟一個(gè) 音樂(lè)文件,因?yàn)槲乙龅氖且粋€(gè)有聲音的鬧鈴