Question

从这里得到代码： Coverflow

我需要制作一个垂直方法，通过改变一些方法来完成，但整个方法是相同的，但它，也有一个内存问题（我在Android 2.2中构建）。我必须使用drawable的图像。如果有人使用过这个样本，请告诉我你是如何处理内存问题的。

主要类是：

package com.example.coverflow;




      import java.io.FileInputStream;
       import java.io.FileOutputStream;

  import android.app.Activity;
  import android.content.Context;
  import android.graphics.Bitmap;
  import android.graphics.BitmapFactory;
  import android.graphics.Canvas;
  import android.graphics.LinearGradient;
  import android.graphics.Matrix;
  import android.graphics.Paint;
  import android.graphics.PorterDuffXfermode;
  import android.graphics.Bitmap.CompressFormat;
  import android.graphics.Bitmap.Config;
  import android.graphics.PorterDuff.Mode;
    import android.graphics.Shader.TileMode;
    import android.graphics.drawable.BitmapDrawable;
    import android.os.Bundle;
      import android.util.Log;
      import android.view.View;
        import android.view.ViewGroup;
       import android.widget.BaseAdapter;
         import android.widget.ImageView;
       import android.widget.ImageView.ScaleType;


       public class CoverFlowExample extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    CoverFlow coverFlow;
    coverFlow = new CoverFlow(this);

    coverFlow.setAdapter(new ImageAdapter(this));

    ImageAdapter coverImageAdapter =  new ImageAdapter(this);

    coverImageAdapter.createReflectedImages();

    coverFlow.setAdapter(coverImageAdapter);

    coverFlow.setSpacing(-15);
    coverFlow.setSelection(8, true);


    setContentView(coverFlow);

    //Use this if you want to use XML layout file
    //setContentView(R.layout.main);
    //coverFlow =  (CoverFlow) findViewById(R.id.coverflow);


}

public class ImageAdapter extends BaseAdapter {
    int mGalleryItemBackground;
    private Context mContext;

    private FileInputStream fis;

    private Integer[] mImageIds = {
            R.drawable.kasabian_kasabian,
            R.drawable.starssailor_silence_is_easy,
            R.drawable.killers_day_and_age,
            R.drawable.garbage_bleed_like_me,
            R.drawable.death_cub_for_cutie_the_photo_album,
            R.drawable.kasabian_kasabian,
            R.drawable.massive_attack_collected,
            R.drawable.muse_the_resistance,
            R.drawable.starssailor_silence_is_easy
    };

    private ImageView[] mImages;

    public ImageAdapter(Context c) {
        mContext = c;
        mImages = new ImageView[mImageIds.length];
    }
    public boolean createReflectedImages() {
            //The gap we want between the reflection and the original image
            final int reflectionGap = 4;


            int index = 0;
            for (int imageId : mImageIds) {
                Bitmap originalImage = BitmapFactory.decodeResource(getResources(), 
                        imageId);
                int width = originalImage.getWidth();
                int height = originalImage.getHeight();


                //This will not scale but will flip on the Y axis
                Matrix matrix = new Matrix();
                matrix.preScale(1, -1);

                //Create a Bitmap with the flip matrix applied to it.
                //We only want the bottom half of the image
                Bitmap reflectionImage = Bitmap.createBitmap(originalImage, 0, height/2, width, height/2, matrix, false);


                //Create a new bitmap with same width but taller to fit reflection
                Bitmap bitmapWithReflection = Bitmap.createBitmap(width 
                  , (height + height/2), Config.ARGB_8888);

               //Create a new Canvas with the bitmap that's big enough for
               //the image plus gap plus reflection
               Canvas canvas = new Canvas(bitmapWithReflection);
               //Draw in the original image
               canvas.drawBitmap(originalImage, 0, 0, null);
               //Draw in the gap
               Paint deafaultPaint = new Paint();
               canvas.drawRect(0, height, width, height + reflectionGap, deafaultPaint);
               //Draw in the reflection
               canvas.drawBitmap(reflectionImage,0, height + reflectionGap, null);

               //Create a shader that is a linear gradient that covers the reflection
               Paint paint = new Paint(); 
               LinearGradient shader = new LinearGradient(0, originalImage.getHeight(), 0, 
                 bitmapWithReflection.getHeight() + reflectionGap, 0x70ffffff, 0x00ffffff, 
                 TileMode.CLAMP); 
               //Set the paint to use this shader (linear gradient)
               paint.setShader(shader); 
               //Set the Transfer mode to be porter duff and destination in
               paint.setXfermode(new PorterDuffXfermode(Mode.DST_IN)); 
               //Draw a rectangle using the paint with our linear gradient
               canvas.drawRect(0, height, width, 
                 bitmapWithReflection.getHeight() + reflectionGap, paint); 

               ImageView imageView = new ImageView(mContext);
               imageView.setImageBitmap(bitmapWithReflection);
               imageView.setLayoutParams(new CoverFlow.LayoutParams(120, 180));
               imageView.setScaleType(ScaleType.MATRIX);
               mImages[index++] = imageView;

            }
            return true;
    }

    public int getCount() {
        return mImageIds.length;
    }

    public Object getItem(int position) {
        return position;
    }

    public long getItemId(int position) {
        return position;
    }

    public View getView(int position, View convertView, ViewGroup parent) {

        //Use this code if you want to load from resources
        //ImageView i = new ImageView(mContext);
        //i.setImageResource(mImageIds[position]);
        //i.setLayoutParams(new CoverFlow.LayoutParams(130, 130));
        //i.setScaleType(ImageView.ScaleType.MATRIX);           
        //return i;

        return mImages[position];
    }
     /** Returns the size (0.0f to 1.0f) of the views 
     * depending on the 'offset' to the center. */ 
     public float getScale(boolean focused, int offset) { 
       /* Formula: 1 / (2 ^ offset) */ 
         return Math.max(0, 1.0f / (float)Math.pow(2, Math.abs(offset))); 
     } 

}

}

Answer 1

<com.example.coverflow.CoverFlow
android:id="@+id/coverflow"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
/>

我认为您没有相应更改包名称。

Coverflow有OOM例外

1 个答案: