android使用数组从url共享图像？

Question

我是 android 新手，我想与我的图像存储阵列中的相应位置共享我的图像。我使用了一个 viewpage 采用者，所以当用户向左或向右滑动时，imageview 会发生变化。现在我想分享一下这是一组imageview代码。

  package anil.card.christmas.christmascard;

import android.content.Context;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.drawable.Drawable;
import android.net.Uri;
import android.support.v4.view.PagerAdapter;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.Toast;

import java.io.File;
import java.io.FileOutputStream;

class ChristmasAdopter extends PagerAdapter {
    Context mContext;
    LayoutInflater mLayoutInflater;
    ImageView imageView;

    int imagepostion;
    private int[] mResources = {R.drawable.cs25, R.drawable.cs2,R.drawable.dx,R.drawable.prd, R.drawable.op,
            R.drawable.ud, R.drawable.ok,R.drawable.cs3,R.drawable.mux,R.drawable.ch, R.drawable.cs5,R.drawable.anil,
            R.drawable.cs6, R.drawable.cs7, R.drawable.pk, R.drawable.cs8, R.drawable.cs9,R.drawable.gk, R.drawable.cs10,
            R.drawable.cs11, R.drawable.cs13, R.drawable.cs14, R.drawable.cs15, R.drawable.cs16, R.drawable.cs17, R.drawable.cs19, R.drawable.cs21, R.drawable.cs23, R.drawable.cs1, R.drawable.cs27, R.drawable.cs29, R.drawable.cs31, R.drawable.cs33,
            R.drawable.cs35,R.drawable.newyear,R.drawable.ny,R.drawable.mn,R.drawable.hp,R.drawable.lifenew,

    R.drawable.cat,R.drawable.dog,R.drawable.flower,R.drawable.ws,R.drawable.chars,
    R.drawable.ship,R.drawable.bells,R.drawable.gift,R.drawable.dj};

    public ChristmasAdopter(Context context) {
        mContext = context;
        mLayoutInflater = (LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    }

    @Override
    public int getCount() {
        return mResources.length;
    }

    @Override
    public boolean isViewFromObject(View view, Object object) {
        return view == ((LinearLayout) object);
    }

    @Override
    public Object instantiateItem(ViewGroup container, int position) {
        View itemView = mLayoutInflater.inflate(R.layout.pager_item, container, false);

        imageView = (ImageView) itemView.findViewById(R.id.imageView);

      imagepostion=position;
    imageView.setImageResource(mResources[position]);

    container.addView(itemView);

        return itemView;
    }


    @Override
    public void destroyItem(ViewGroup container, int position, Object object) {
        container.removeView((LinearLayout) object);
    }


// here is share content please tell me how i can share image which is show in imageView
    public void shareContent(){

        Toast.makeText(mContext, ""+imagepostion, Toast.LENGTH_SHORT).show();



    }

    private Bitmap getBitmapFromView(View view) {
        Bitmap returnedBitmap = Bitmap.createBitmap(view.getWidth(), view.getHeight(),Bitmap.Config.ARGB_8888);
        Canvas canvas = new Canvas(returnedBitmap);
        Drawable bgDrawable =view.getBackground();
        if (bgDrawable!=null) {
            bgDrawable.draw(canvas);
        }   else{
            canvas.drawColor(Color.WHITE);
        }
        view.draw(canvas);
        return returnedBitmap;
    }

}



    }

Answer 1

在您的 ChristmasAdopter 类中，将 instantiateItem() 替换为，

@Override
public Object instantiateItem(ViewGroup container, int position) {
    View itemView = mLayoutInflater.inflate(R.layout.pager_item, container, false);

    imageView = (ImageView) itemView.findViewById(R.id.imageView);

  imagepostion=position;
  imageView.setImageResource(mResources[position]);

  imageView.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
//save image to device
      saveImage();
//share image code
      shareImageFromDevice();
    }
    });
    container.addView(itemView);

    return itemView;
}

private void saveImage(){

Bitmap bitmap = BitmapFactory.decodeResource(getResources(),mResources[position]);

File image = new File(getExternalFilesDir(null), "test.png");
// After that, you just have to write the Bitmap thanks to its method compress such as:

boolean success = false;

// Encode the file as a PNG image.
FileOutputStream outStream;
try {

    outStream = new FileOutputStream(image);
    bitmap.compress(Bitmap.CompressFormat.PNG, 100, outStream);
    /* 100 to keep full quality of the image */

    outStream.flush();
    outStream.close();
    success = true;
} catch (IOException e) {
    e.printStackTrace();
}
//Finally, just deal with the boolean result if needed. Such as:

if (success) {
    Toast.makeText(getApplicationContext(), "Image saved with success",
            Toast.LENGTH_LONG).show();
} else {
    Toast.makeText(getApplicationContext(),
            "Error during image saving", Toast.LENGTH_LONG).show();
}
}
    private void shareImageFromDevice(){

    File file = new File(getExternalFilesDir(null), "test.png");

    Uri uri=Uri.fromFile(file);

    Intent share = new Intent(Intent.ACTION_SEND);
    share.setType("image/*");
    share.putExtra(Intent.EXTRA_STREAM, uri);
    startActivity(Intent.createChooser(share, "Share Image"));
}