Android Open Source - LiveWallpaperTutorial Canvas Player

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Back to project page LiveWallpaperTutorial.

License

The source code is released under:

Apache License

Java Source Code

package com.annalytics.livewallpapertutorial;
//from  ww  w  . ja  va2 s  . co m
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Paint.Style;
import android.graphics.Rect;
import android.view.animation.LinearInterpolator;

public class CanvasPlayer
{
  private static final long ROTATE_TIME = 4000;
  
  private Context mContext;
  private float mAngle = 0;
  private LinearInterpolator mInter = new LinearInterpolator();
  private long mTime = 0;
  private Bitmap mBitmap;
  private int mBitmapWidth, mBitmapHeight;
  private int mWidth, mHeight;
  
  protected BitmapFactory.Options mOptions;
  
  public CanvasPlayer(Context c)
  {
    mContext = c;
    mOptions = new BitmapFactory.Options();
  }
  
  public void draw(Canvas canvas, int height, int width, long delta)
  {
    mWidth = width;
    mHeight = height;
    if(mBitmap == null)
    {
      mBitmap = getScaledImage(R.drawable.ic_launcher, true);
      mBitmapWidth = mBitmap.getWidth();
      mBitmapHeight = mBitmap.getHeight();
    }
    
    canvas.drawColor(Color.BLACK);
    
    mTime += delta;
    if(mTime > ROTATE_TIME)
    {
      mTime -= ROTATE_TIME;
    }
    float perc = mInter.getInterpolation(mTime/(float)ROTATE_TIME);
    mAngle = 360*perc;
    
    int squaresize = 100;

    Paint p = new Paint();
    p.setColor(Color.RED);
    p.setStyle(Style.FILL_AND_STROKE);
    
    Rect r = new Rect(0, 0, squaresize, squaresize);
    r.offsetTo(width/2 - squaresize/2, height/2 - squaresize/2);
        
    canvas.rotate(mAngle, width/2, height/2);
    canvas.drawRect(r, p);
    
    canvas.drawBitmap(mBitmap, width/2, height/2, null);
  }
  
  protected Bitmap getScaledImage(int drawable, boolean width)
  {
    mOptions.inTargetDensity = 0;
    mOptions.inScaled = false;
    mOptions.inSampleSize = 1;
    mOptions.inJustDecodeBounds = true;

    BitmapFactory.decodeResource(mContext.getResources(), drawable, mOptions);
    if (width)
    {
      if (mOptions.outWidth > mWidth)
      {
        mOptions.inSampleSize = (int) Math.round((float) mOptions.outWidth / (float) mWidth);
      }
    }
    else
    {
      if (mOptions.outHeight > mHeight)
      {
        mOptions.inSampleSize = (int) Math.round((float) mOptions.outHeight / (float) mHeight);
      }
    }

    return getBitmapUsingPreviousSettings(drawable);
  }
  
  protected Bitmap getBitmapUsingPreviousSettings(int drawable)
  {
    mOptions.inJustDecodeBounds = false;
    Bitmap b = BitmapFactory.decodeResource(mContext.getResources(), drawable, mOptions);
    return b;
  }
}

Java Source Code List

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