学步园

本文地址：http://blog.csdn.net/you_and_me12/article/details/7262988

从SD卡中获取图片资源，或者拍一张新的图片。

先贴代码

获取图片：

注释：拍照获取的话，可以指定图片的保存地址，在此不说明。

		CharSequence[] items = {"相册", "相机"};  
	    new AlertDialog.Builder(this)
		    .setTitle("选择图片来源")
		    .setItems(items, new OnClickListener() {
				public void onClick(DialogInterface dialog, int which) {
					if( which == SELECT_PICTURE ){
						Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
						intent.addCategory(Intent.CATEGORY_OPENABLE);
						intent.setType("image/*");
						startActivityForResult(Intent.createChooser(intent, "选择图片"), SELECT_PICTURE); 
			        }else{
			        	Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);  
			        	startActivityForResult(intent, SELECT_CAMER);  
			        }
				}
			})
			.create().show(); 

处理图片，方法一，直接处理返回图片：

注释：

1、网上有说明，直接处理返回的图片是被系统压缩过的，不过自己在测试的过程并没有区别；

2、如果用户不断的重新获取图片的话，必须把现在的Bmp内存释放，否则会报错！
bmp.recycle()。

	protected void onActivityResult(int requestCode, int resultCode, Intent data) {
		super.onActivityResult(requestCode, resultCode, data);
		if(resultCode == RESULT_OK){
			//选择图片
			Uri uri = data.getData(); 
			ContentResolver cr = this.getContentResolver(); 
			try {
				if(bmp != null)//如果不释放的话，不断取图片，将会内存不够
					bmp.recycle();
				bmp = BitmapFactory.decodeStream(cr.openInputStream(uri));
			} catch (FileNotFoundException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
			System.out.println("the bmp toString: " + bmp);
			imageSV.setBmp(bmp);
		}else{
			Toast.makeText(SetImageActivity.this, "请重新选择图片", Toast.LENGTH_SHORT).show();
		}
			
	}

处理图片，方法二，获得图片的地址再处理：

	protected void onActivityResult(int requestCode, int resultCode, Intent data) {
		super.onActivityResult(requestCode, resultCode, data);
		if(resultCode == RESULT_OK){
			Uri uri = data.getData(); 
			String [] proj={MediaStore.Images.Media.DATA};
			Cursor cursor = managedQuery( uri,
					proj,                 // Which columns to return
					null,       // WHERE clause; which rows to return (all rows)
					null,       // WHERE clause selection arguments (none)
					null);                 // Order-by clause (ascending by name)
			
			int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
			cursor.moveToFirst();
			
			String path = cursor.getString(column_index);
			bmp = BitmapFactory.decodeFile(path);
			System.out.println("the path is :" + path);
		}else{
			Toast.makeText(SetImageActivity.this, "请重新选择图片", Toast.LENGTH_SHORT).show();
		}
			
	}