如何向逐帧动画添加滚动背景？

我有一个Android应用程序内的帧动画工作。这很好 - 但我该如何将滚动背景添加到此应用程序，以便动画在背景上运行？我可以找到大量的例子来分别实现这两个过程 - 但不是在一起。任何帮助，将不胜感激！这里是我的动画活动代码..如何向逐帧动画添加滚动背景？

import java.util.ArrayList; 

import android.content.Context; 
import android.graphics.Bitmap; 
import android.graphics.Canvas; 
import android.graphics.drawable.BitmapDrawable; 
import android.graphics.drawable.Drawable; 
import android.util.AttributeSet; 
import android.util.Log; 
import android.view.SurfaceView; 
import android.widget.ImageView; 

/** 
* 
* 
*/ 
public class MyAnimationView extends ImageView 
{ 
    private static final String TAG = "AnimationTest:AnimationView"; 
    private Context mContext = null; 

    private static final int DELAY = 100; //delay between frames in milliseconds 

    private boolean mIsPlaying = false; 
    private boolean mStartPlaying = false; 

    private ArrayList<Bitmap> mBitmapList = new ArrayList<Bitmap>(); 

    private int play_frame = 0; 
    private long last_tick = 0; 

    public MyAnimationView(Context context, AttributeSet attrs) 
    { 
     super(context, attrs); 
     mContext = context; 
    } 

    @Override 
    protected void onDraw(Canvas c) 
    { 
     Log.d(TAG, "onDraw called"); 
     if (mStartPlaying) 
     { 
      Log.d(TAG, "starting animation..."); 
      play_frame = 0; 
      mStartPlaying = false; 
      mIsPlaying = true; 
      postInvalidate(); 
     } 
     else if (mIsPlaying) 
     { 

      if (play_frame >= mBitmapList.size()) 
      { 
       mIsPlaying = false; 
      } 
      else 
      { 
       long time = (System.currentTimeMillis() - last_tick); 
       int draw_x = 0; 
       int draw_y = 0; 
       if (time >= DELAY) //the delay time has passed. set next frame 
       { 
        last_tick = System.currentTimeMillis(); 
        c.drawBitmap(mBitmapList.get(play_frame), draw_x, draw_y, null); 
        play_frame++; 
        postInvalidate(); 
       } 
       else //still within delay. redraw current frame 
       { 
        c.drawBitmap(mBitmapList.get(play_frame), draw_x, draw_y, null); 
        postInvalidate(); 
       } 
      } 
     } 
    } 

    /*ideally this should be in a background thread*/ 
    public void loadAnimation(String prefix, int nframes) 
    { 
     mBitmapList.clear(); 
     for (int x = 0; x < nframes; x++) 
     { 
      String name = prefix + "_" + x; 
      Log.d(TAG, "loading animation frame: " + name); 
      int res_id = mContext.getResources().getIdentifier(name, "drawable", mContext.getPackageName()); 
      BitmapDrawable d = (BitmapDrawable) mContext.getResources().getDrawable(res_id); 
      mBitmapList.add(d.getBitmap()); 
     } 
    } 

    public void playAnimation() 
    { 
     mStartPlaying = true; 
     postInvalidate(); 
    } 
}

来源

2015-06-21 user1641906

“draw_x”和“draw_y”是你的位图位置的变量。如果你改变这两个变量（或者只是其中的一个），你可以在屏幕上移动（滚动）你的图片。

来源

2015-08-12 21:57:14

如何向逐帧动画添加滚动背景？

回答

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