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; 

   } 
}