在选择gridview时，将一个图像从一个活动移动到另一个活动

时间：2012-01-12 09:34:19

标签： android gridview bitmap android-intent

我有一个网格视图，其中包含图像，当点击一个图像时，它应该在另一个页面打开。我需要将图像从一个活动传递到另一个我要获取图像像素的图像。我有获取像素的代码。我需要的是，我必须在其他活动中显示图像，以便获得pixel.how将所选图像从一个活动传递到另一个活动.i已经尝试了一些来自堆栈的解决方案溢出但它没有起作用

// GridviewActivity.java

  

包gr.ed.vi; 

          import android.app.Activity;
              import android.content.Context;
                import android.content.Intent;
           import android.os.Bundle;
           import android.view.View;
           import android.view.ViewGroup;
           import android.widget.AdapterView;
            import android.widget.BaseAdapter;
              import android.widget.GridView;
             import android.widget.ImageView;
                   import android.widget.Toast;
            import android.widget.AdapterView.OnItemClickListener;

      public class GridviewActivity extends Activity
    {    
    //---the images to display---
     Integer[] imageIDs = {
        R.drawable.ic_launcher,
        R.drawable.ic_launcher,
        R.drawable.ic_launcher,
        R.drawable.ic_launcher,
        R.drawable.ic_launcher,
        R.drawable.ic_launcher,
        R.drawable.ic_launcher                    
};

@Override    
public void onCreate(Bundle savedInstanceState) 
{
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    GridView gridView = (GridView) findViewById(R.id.gridview);
    gridView.setAdapter(new ImageAdapter(this));

    gridView.setOnItemClickListener(new OnItemClickListener() 
    {
        public void onItemClick(AdapterView parent, 
        View v, int position, long id) 
        {                
           /* Toast.makeText(getBaseContext(), 
                    "pic" + (position + 1) + " selected", 
                    Toast.LENGTH_SHORT).show();*/
            switch(position){
           case 0:

           break;
           case 1:
           //call second class
              Intent intent = new Intent(GridviewActivity.this, sm.class);

         //  intent.putExtra("photo",imageIDs);
           //  Log.d(TAG, "jpegCallback1" +data);
            startActivity(intent); 

             // intent.putExtra("img", imageIDs);
             //startActivity(intent);

           break;
           case 2:
           //call third class
               Intent k1=new Intent(GridviewActivity.this,sm.class);
               startActivity(k1);
           break;

           default:
           break;
               }
        }
    });        
   }

   public class ImageAdapter extends BaseAdapter 
    {
    private Context context;

    public ImageAdapter(Context c) 
    {
        context = c;
    }

    //---returns the number of images---
    public int getCount() {
        return imageIDs.length;
    }

    //---returns the ID of an item--- 
    public Object getItem(int position) {
        return position;
    }

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

    //---returns an ImageView view---
    public View getView(int position, View convertView, ViewGroup parent) 
    {
        ImageView imageView;
        if (convertView == null) {
            imageView = new ImageView(context);
            imageView.setLayoutParams(new GridView.LayoutParams(85, 85));
            imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
            imageView.setPadding(5, 5, 5, 5);
        } else {
            imageView = (ImageView) convertView;
        }
        imageView.setImageResource(imageIDs[position]);
        return imageView;
       }
   }    
  }

sm.java 

package gr.ed.vi;

import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.BlurMaskFilter;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.PorterDuffXfermode;
import android.graphics.Rect;
import android.graphics.AvoidXfermode.Mode;
import android.graphics.Bitmap.Config;
import android.graphics.BlurMaskFilter.Blur;
import android.os.Bundle;
import android.view.MotionEvent;
import android.view.View;
import android.view.Window;
import android.view.WindowManager;

public class sm extends Activity {
/** Called when the activity is first created. */
Bitmap overlay;      
Paint pTouch;
int X = -100;
int Y = -100;
Canvas c2;
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    Bundle extras = getIntent().getExtras();
    byte[] photo = extras.getByteArray("photo");
    Bitmap mBitmap  = BitmapFactory.decodeByteArray (photo, 0, photo.length);
    Bitmap mBitmapover  = BitmapFactory.decodeByteArray (photo, 0, photo.length);

             getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,              
     WindowManager.LayoutParams.FLAG_FULLSCREEN);
    requestWindowFeature(Window.FEATURE_NO_TITLE);
   // Bitmap mBitmap = BitmapFactory.decodeResource(getResources(),         
    R.drawable.android);
   // Bitmap mBitmapover = BitmapFactory.decodeResource(getResources(), R.drawable.ss);
    overlay =   
    BitmapFactory.decodeResource                 
   (getResources(),R.drawable.ss).copy(Config.ARGB_8888, true);  
    c2 = new Canvas(overlay);

    pTouch = new Paint(Paint.ANTI_ALIAS_FLAG);         
  //  pTouch.setXfermode(new PorterDuffXfermode(Mode.TARGET); 
    pTouch.setColor(Color.TRANSPARENT);
    pTouch.setMaskFilter(new BlurMaskFilter(15, Blur.NORMAL));
    setContentView(new BitMapView(this, mBitmap,mBitmapover));
}

class BitMapView extends View {
    Bitmap mBitmap = null;
    Bitmap mBitmapover = null;

    public BitMapView(Context context, Bitmap bm, Bitmap bmover) {
    super(context);
    mBitmap = bm;
    mBitmapover = bmover;
    }
     @Override
     public boolean onTouchEvent(MotionEvent ev) {

         switch (ev.getAction()) {

             case MotionEvent.ACTION_DOWN: {

                 X = (int) ev.getX();
                 Y = (int) ev.getY();
                 invalidate();

                 break;
             }

             case MotionEvent.ACTION_MOVE: {

                     X = (int) ev.getX();
                     Y = (int) ev.getY();
                     invalidate();
                     break;

             }           

             case MotionEvent.ACTION_UP:

                 break;

         }
         return true;
     }


    @Override
    protected void onDraw(Canvas canvas) {
    // called when view is drawn
    Paint paint = new Paint();
    paint.setFilterBitmap(true);
    // The image will be scaled so it will fill the width, and the
    // height will preserve the image’s aspect ration
/*  double aspectRatio = ((double) mBitmap.getWidth()) / mBitmap.getHeight();
    Rect dest = new Rect(0, 0, this.getWidth(),(int) (this.getHeight() / aspectRatio));
    double aspectRatio2 = ((double) mBitmapover.getWidth()) / mBitmapover.getHeight();
    Rect dest2 = new Rect(0, 0, this.getWidth(),(int) (this.getHeight() / aspectRatio2));
    canvas.drawBitmap(mBitmap, null, dest, paint);
    canvas.drawBitmap(mBitmapover, null, dest2, paint);                    */

    //draw background
    canvas.drawBitmap(mBitmap, 0, 0, null);
    //copy the default overlay into temporary overlay and punch a hole in it                          
    c2.drawBitmap(mBitmapover, 0, 0, null); //exclude this line to show all as you draw
    c2.drawCircle(X, Y, 80, pTouch);
    //draw the overlay over the background  
    canvas.drawBitmap(overlay, 0, 0, null);
    }
}

4 个答案:

答案 0 :(得分：2)

单击图像时，

* 获取该图像的paht / uri并创建意图并将该值置于意图中并将其放入另一个活动中并显示它。

例如：

gridview.setOnItemClickListener（new OnItemClickListener（）{

    public void onItemClick(AdapterView<?> parent, View v, int position, long id) {
              int i=R.drawable.ic_launcher;

             Intent intent = new Intent(SamaaActivity.this,kl.class); 
            intent.putExtra("intVariableName", i);
            startActivity(intent);
    }
});

并在其他活动

上获取此信息 
Intent mIntent = getIntent();
    int intValue = mIntent.getIntExtra("intVariableName", 0);

答案 1 :(得分：0)

您可以在选择项目时获取图片ID并将ID传递给第二个活动并根据该图片检索图片，或者您可以使用static变量和Bitmap将图片从一个传递到第二个，这样当它获得选择时只是轻松显示这些图像

答案 2 :(得分：0)

您还可以将图像的uri作为用于调用第二个活动的意图的附加内容传递。这样您就可以避免解码数据，直到您真正需要它为止。

答案 3 :(得分：0)

Bitmap已经实现Parcelable，只需将您的位图置于意图中并将其传递给下一个活动。 

gridview.setOnItemClickListener(new OnItemClickListener() {
  public void onItemClick(AdapterView<?> parent, View v, int position, long id) {
    Bitmap image = imageAdapter.getItem(position);
    Intent intent = new Intent(getBaseContext(), NextActivity.class);
    intent.putExtra("details", image);
    startActivity(intent);
  }
});

<强>更新
最好更改ImageAdapter.getItem（）实现以返回ImageView或Bitmap，将imageView转换为Bitmap，只需执行以下操作：

BitmapDrawable drawable = (BitmapDrawable) imageView.getDrawable();
Bitmap bitmap = drawable.getBitmap();

从NextActivity检索位图：

Parcelable details = getIntent().getExtras().getParcelable("details");
Bitmap bitmap = (Bitmap) details;
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