Android Open Source - gif-video-adrnoid Gif Movie View






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Back to project page gif-video-adrnoid.

License

The source code is released under:

Copyright (c) 2013, Sergey Bakhtiarov All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are me...

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Java Source Code

package com.basv.gifmoviewview.widget;
// ww w . j  ava  2s . co  m
import android.annotation.SuppressLint;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Movie;
import android.os.Build;
import android.util.AttributeSet;
import android.view.View;

import com.basv.gifmoviewview.R;

/**
 * This is a View class that wraps Android {@link Movie} object and displays it.
 * You can set GIF as a Movie object or as a resource id from XML or by calling
 * {@link #setMovie(Movie)} or {@link #setMovieResource(int)}.
 * <p>
 * You can pause and resume GIF animation by calling {@link #setPaused(boolean)}.
 * <p>
 * The animation is drawn in the center inside of the measured view bounds.
 * 
 * @author Sergey Bakhtiarov
 */

public class GifMovieView extends View {

  private static final int DEFAULT_MOVIEW_DURATION = 1000;

  private int mMovieResourceId;
  private Movie mMovie;

  private long mMovieStart;
  private int mCurrentAnimationTime = 0;
  
  /**
   * Position for drawing animation frames in the center of the view.
   */
  private float mLeft;
  private float mTop;

  /**
   * Scaling factor to fit the animation within view bounds.
   */
  private float mScale;

  /**
   * Scaled movie frames width and height.
   */
  private int mMeasuredMovieWidth;
  private int mMeasuredMovieHeight;

  private volatile boolean mPaused = false;
  private boolean mVisible = true;

  public GifMovieView(Context context) {
    this(context, null);
  }

  public GifMovieView(Context context, AttributeSet attrs) {
    this(context, attrs, R.styleable.CustomTheme_gifMoviewViewStyle);
  }

  public GifMovieView(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) {

    /**
     * Starting from HONEYCOMB have to turn off HW acceleration to draw
     * Movie on Canvas.
     */
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
      setLayerType(View.LAYER_TYPE_SOFTWARE, null);
    }

    final TypedArray array = context.obtainStyledAttributes(attrs, R.styleable.GifMoviewView, defStyle,
        R.style.Widget_GifMoviewView);

    mMovieResourceId = array.getResourceId(R.styleable.GifMoviewView_gif, -1);
    mPaused = array.getBoolean(R.styleable.GifMoviewView_paused, false);

    array.recycle();

    if (mMovieResourceId != -1) {
      mMovie = Movie.decodeStream(getResources().openRawResource(mMovieResourceId));
    }
  }

  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();
  }

  public void setPaused(boolean paused) {
    this.mPaused = paused;

    /**
     * Calculate new movie start time, so that it resumes from the same
     * frame.
     */
    if (!paused) {
      mMovieStart = android.os.SystemClock.uptimeMillis() - mCurrentAnimationTime;
    }

    invalidate();
  }

  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();

      /*
       * Calculate horizontal scaling
       */
      float scaleH = 1f;
      int measureModeWidth = MeasureSpec.getMode(widthMeasureSpec);

      if (measureModeWidth != MeasureSpec.UNSPECIFIED) {
        int maximumWidth = MeasureSpec.getSize(widthMeasureSpec);
        if (movieWidth > maximumWidth) {
          scaleH = (float) movieWidth / (float) maximumWidth;
        }
      }

      /*
       * calculate vertical scaling
       */
      float scaleW = 1f;
      int measureModeHeight = MeasureSpec.getMode(heightMeasureSpec);

      if (measureModeHeight != MeasureSpec.UNSPECIFIED) {
        int maximumHeight = MeasureSpec.getSize(heightMeasureSpec);
        if (movieHeight > maximumHeight) {
          scaleW = (float) movieHeight / (float) maximumHeight;
        }
      }

      /*
       * calculate overall scale
       */
      mScale = 1f / Math.max(scaleH, scaleW);

      mMeasuredMovieWidth = (int) (movieWidth * mScale);
      mMeasuredMovieHeight = (int) (movieHeight * mScale);

      setMeasuredDimension(mMeasuredMovieWidth, mMeasuredMovieHeight);

    } else {
      /*
       * No movie set, just set minimum available size.
       */
      setMeasuredDimension(getSuggestedMinimumWidth(), getSuggestedMinimumHeight());
    }
  }

  @Override
  protected void onLayout(boolean changed, int l, int t, int r, int b) {
    super.onLayout(changed, l, t, r, b);

    /*
     * Calculate left / top for drawing in center
     */
    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);
      }
    }
  }
  
  /**
   * Invalidates view only if it is visible.
   * <br>
   * {@link #postInvalidateOnAnimation()} is used for Jelly Bean and higher.
   * 
   */
  @SuppressLint("NewApi")
  private void invalidateView() {
    if(mVisible) {
      if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) {
        postInvalidateOnAnimation();
      } else {
        invalidate();
      }
    }
  }

  /**
   * Calculate current animation time
   */
  private void updateAnimationTime() {
    long now = android.os.SystemClock.uptimeMillis();

    if (mMovieStart == 0) {
      mMovieStart = now;
    }

    int dur = mMovie.duration();

    if (dur == 0) {
      dur = DEFAULT_MOVIEW_DURATION;
    }

    mCurrentAnimationTime = (int) ((now - mMovieStart) % dur);
  }

  /**
   * Draw current GIF frame
   */
  private void drawMovieFrame(Canvas canvas) {

    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();
  }
}




Java Source Code List

com.basv.gifmoviewview.MainActivity.java
com.basv.gifmoviewview.widget.GifMovieView.java