用Intent传递图片

基本思路是先把bitmap转化为byte数组，用Intent传递数组，在将数组转化为bitmap

bitmap转化为byte数组的方法：

 private byte[] Bitmap2Bytes(Bitmap bm){
     ByteArrayOutputStream baos = new ByteArrayOutputStream();
     bm.compress(Bitmap.CompressFormat.PNG, 100, baos);
     return baos.toByteArray();
    }

byte数组转化为bitmap方法：

 byte buff[]=mIntent.getByteArrayExtra("image");
 bitmap = BitmapFactory.decodeByteArray(buff, 0, buff.length);

 

程序实例：

第一个activity：

 import java.io.ByteArrayOutputStream;

 import android.app.Activity;
 import android.content.Intent;
 import android.graphics.Bitmap;
 import android.graphics.BitmapFactory;
 import android.graphics.drawable.BitmapDrawable;
 import android.os.Bundle;
 import android.view.View;
 import android.view.View.OnClickListener;
 import android.widget.Button;
 import android.widget.ImageView;

 public class SendImageActivity extends Activity implements OnClickListener {

     /** Called when the activity is first created. */
     private Bitmap bitmap;
     byte buff[] = new byte[125*250];
     @Override
     public void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.main);

         ImageView mImageView = (ImageView) findViewById(R.id.image);
         Button bt1 = (Button) findViewById(R.id.bt1);
         bitmap =BitmapFactory.decodeResource(getResources(), R.drawable.option24);


         buff = Bitmap2Bytes(bitmap);


         BitmapDrawable mBitmapDrawable = new BitmapDrawable(bitmap);
         mImageView.setBackgroundDrawable(mBitmapDrawable);
         bt1.setOnClickListener(this);
     }

     @Override
     public void onClick(View arg0) {
         // TODO Auto-generated method stub
         Intent mIntent = new Intent();
         mIntent.putExtra("image", buff);
         mIntent.setClass(this, activity2.class);
         startActivity(mIntent);
     }

     private byte[] Bitmap2Bytes(Bitmap bm){
         ByteArrayOutputStream baos = new ByteArrayOutputStream();
         bm.compress(Bitmap.CompressFormat.PNG, 100, baos);
         return baos.toByteArray();
        }



 }

第二个activity：

 import android.app.Activity;
 import android.content.Intent;
 import android.graphics.Bitmap;
 import android.graphics.BitmapFactory;
 import android.graphics.drawable.BitmapDrawable;
 import android.os.Bundle;
 import android.widget.Button;
 import android.widget.ImageView;

 public class activity2 extends Activity {

     private Bitmap bitmap;
     public void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.layout2);
         ImageView mImageView = (ImageView) findViewById(R.id.image2);


         Intent mIntent = getIntent();
         byte buff[]=mIntent.getByteArrayExtra("image");
         bitmap = BitmapFactory.decodeByteArray(buff, 0, buff.length);

         BitmapDrawable mBitmapDrawable = new BitmapDrawable(bitmap);
         mImageView.setBackgroundDrawable(mBitmapDrawable);

     }
 }