从相册或者相机获得uri转为bitmap

package com.amani.main;

import java.io.ByteArrayOutputStream;
import java.io.InputStream;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.ContentResolver;
import android.content.DialogInterface;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.net.Uri;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.ImageView;

public class chooser extends Activity {

        private ImageView imageView;
        private OnClickListener imgViewListener;
        Bitmap myBitmap;
        private byte[] mContent;
      
        @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        imageView = (ImageView) findViewById(R.id.ivPic);
       
        imgViewListener = new OnClickListener() {
                        public void onClick(View v) {
                                final CharSequence[] items = { "相册", "拍照" };
                                AlertDialog dlg = new AlertDialog.Builder(chooser.this).setTitle("选择图片").setItems(items,
                                new DialogInterface.OnClickListener() {
                                public void onClick(DialogInterface dialog,int item) {
                                        //这里item是根据选择的方式，        在items数组里面定义了两种方式，拍照的下标为1所以就调用拍照方法      
                                        if(item==1){
                                                                Intent getImageByCamera= new Intent("android.media.action.IMAGE_CAPTURE");  
                                                                startActivityForResult(getImageByCamera, 1);  
                                                        }else{
                                                                Intent getImage = new Intent(Intent.ACTION_GET_CONTENT);
                                                        getImage.addCategory(Intent.CATEGORY_OPENABLE);
                                                        getImage.setType("image/jpeg");
                                                        startActivityForResult(getImage, 0);
                                                        }
                                                }
                                        }).create();
                                dlg.show();
                        }
                };
                //给imageView控件绑定点点击监听器
                imageView.setOnClickListener(imgViewListener);
              
    }
      
        @Override
        protected void onActivityResult(int requestCode, int resultCode, Intent data) {
       
        ContentResolver resolver = getContentResolver();
        /**
         * 因为两种方式都用到了startActivityForResult方法，这个方法执行完后都会执行onActivityResult方法，
         * 所以为了区别到底选择了那个方式获取图片要进行判断，这里的requestCode跟startActivityForResult里面第二个参数对应
         */
        if (requestCode == 0) {
            try {
                //获得图片的uri
                Uri originalUri = data.getData();
                //将图片内容解析成字节数组
                mContent=readStream(resolver.openInputStream(Uri.parse(originalUri.toString())));
                //将字节数组转换为ImageView可调用的Bitmap对象
                myBitmap = getPicFromBytes(mContent, null);
                ////把得到的图片绑定在控件上显示
                imageView.setImageBitmap(myBitmap);
            } catch (Exception e) {
                System.out.println(e.getMessage());
            }

        }else if(requestCode ==1){
                try {
                        super.onActivityResult(requestCode, resultCode, data);
                            Bundle extras = data.getExtras();
                            myBitmap = (Bitmap) extras.get("data");
                            ByteArrayOutputStream baos = new ByteArrayOutputStream();    
                            myBitmap.compress(Bitmap.CompressFormat.JPEG , 100, baos);    
                                mContent=baos.toByteArray();
                        } catch (Exception e) {
                                // TODO Auto-generated catch block
                                e.printStackTrace();
                        }
                        //把得到的图片绑定在控件上显示
                        imageView.setImageBitmap(myBitmap);
        }

    }

    public static Bitmap getPicFromBytes(byte[] bytes, BitmapFactory.Options opts) {
        if (bytes != null)
            if (opts != null)
                return BitmapFactory.decodeByteArray(bytes, 0, bytes.length,opts);
            else
                return BitmapFactory.decodeByteArray(bytes, 0, bytes.length);
        return null;
    }
  
    public static byte[] readStream(InputStream inStream) throws Exception {
        byte[] buffer = new byte[1024];
        int len = -1;
        ByteArrayOutputStream outStream = new ByteArrayOutputStream();
        while ((len = inStream.read(buffer)) != -1) {
                 outStream.write(buffer, 0, len);
        }
        byte[] data = outStream.toByteArray();
        outStream.close();
        inStream.close();
        return data;

   }
}