本文實例為大家分享Android通過Movie展示Gif格式圖片的相關(guān)代碼,供大家參考,具體內(nèi)容如下
public class CommonGifView extends View {  private Resources mResources;  private Movie mMovie;  private long startTime = 0;  private float widthRatio;  private float heightRatio;  public CommonGifView(Context context) {    this(context, null);  }  public CommonGifView(Context context, AttributeSet attrs) {    this(context, attrs, 0);  }  public CommonGifView(Context context, AttributeSet attrs, int defStyleAttr) {    super(context, attrs, defStyleAttr);    mResources = context.getResources();    TypedArray ta = context.obtainStyledAttributes(attrs, R.styleable.custom_gif_view);    int src_id = ta.getResourceId(R.styleable.custom_gif_view_gif_src, -1);    setGifViewBg(src_id);    ta.recycle();  }  /**   * 為View設(shè)置gif格式圖片背景   * @description:   * @author ldm   * @date 2016-2-18 上午9:21:16   */  private void setGifViewBg(int src_id) {    if (src_id == -1) { return; }    // 獲取對應(yīng)資源文件的輸入流    InputStream is = mResources.openRawResource(src_id);    mMovie = Movie.decodeStream(is);// 解碼輸入流為Movie對象    requestLayout();  }  /*   * 這個方法供Activity中使用   */  public void setGifStream(InputStream is) {    mMovie = Movie.decodeStream(is);    requestLayout();  }  @Override  protected void onDraw(Canvas canvas) {    super.onDraw(canvas);    long now = SystemClock.uptimeMillis();    if (startTime == 0) { // 如果第一幀,記錄起始時間      startTime = now;    }    if (mMovie != null) {// 如果返回值不等于null,就說明這是一個GIF圖片      int duration = mMovie.duration();// 取出動畫的時長      if (duration == 0) {        duration = 1000;      }      int currentTime = (int) ((now - startTime) % duration);// 算出需要顯示第幾幀      mMovie.setTime(currentTime);      // mMovie.draw(canvas, getWidth() - mMovie.width(), getHeight() - mMovie.height());      float scale = Math.min(widthRatio, heightRatio);      canvas.scale(scale, scale);      mMovie.draw(canvas, 0, 0);      invalidate();    }  }  @Override  protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {    if (mMovie != null) {// 如果返回值不等于null,就說明這是一個GIF圖片      int w = mMovie.width();//寬度      int h = mMovie.height();//高度      if (w <= 0) {        w = 1;      }      if (h <= 0) {        h = 1;      }      int left = getPaddingLeft();      int right = getPaddingRight();      int top = getPaddingTop();      int bottom = getPaddingBottom();      int widthSize, heightSize;      w += left + right;      h += top + bottom;      w = Math.max(w, getSuggestedMinimumWidth());      h = Math.max(h, getSuggestedMinimumHeight());      widthSize = resolveSizeAndState(w, widthMeasureSpec, 0);//根據(jù)你提供的大小和MeasureSpec,返回你想要的大小值      heightSize = resolveSizeAndState(h, heightMeasureSpec, 0);      widthRatio = (float) widthSize / w;      heightRatio = (float) heightSize / h;      setMeasuredDimension(widthSize, heightSize);    }    else {      super.onMeasure(widthMeasureSpec, heightMeasureSpec);    }  }}自定義屬性res/values/attrs.xml文件:
<?xml version="1.0" encoding="utf-8"?><resources> <declare-styleable name="custom_gif_view"> <attr name="gif_src" format="reference"></attr> </declare-styleable></resources>
在Activity中使用:
public class MainActivity extends Activity {  private CommonGifView view;  private InputStream is;  @Override  protected void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentView(R.layout.activity_main);    view = (CommonGifView) findViewById(R.id.gif_test);    try {      is = getAssets().open("test01.gif");      view.setGifStream(is);    }    catch (IOException e) {      e.printStackTrace();    }  }}以上就是本文的全部內(nèi)容,希望對大家的學(xué)習(xí)有所幫助。
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