android 获取图片

Android获取手机或者内存卡里面的图片有两种方式
1.这是通过一种action

        Intent intent=new Intent();
        intent.setAction(Intent.ACTION_GET_CONTENT);
        intent.setType("image/*");
        startActivityForResult(intent, MAIN_PIC);

2.这是通过另一个中action

        Intent intent=new Intent();
        intent.setAction(Intent.ACTION_PICK);
        //EXTERNAL_CONTENT_URI 是外部的存储uri
//      INTERNAL_CONTENT_URI是内部的存储uri
        intent.setData(MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
        startActivityForResult(intent, MAIN_PIC);

然后在onActivityResult里面进行操作

@Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        // TODO Auto-generated method stub
        super.onActivityResult(requestCode, resultCode, data);
        Uri uri = data.getData();

        Bitmap bitmap;
        try {
            bitmap = BitmapFactory.decodeStream(getContentResolver().openInputStream(uri));
            imageview.setImageBitmap(bitmap);    
        } catch (FileNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }    
        /* 将Bitmap设定到ImageView */    
        String[] proj = {MediaStore.Images.Media.DATA};

        //好像是android多媒体数据库的封装接口，具体的看Android文档
        Cursor cursor = managedQuery(uri, proj, null, null, null); 
        //按我个人理解 这个是获得用户选择的图片的索引值
        int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
        //将光标移至开头 ，这个很重要，不小心很容易引起越界
        cursor.moveToFirst();
        //最后根据索引值获取图片路径
        String path = cursor.getString(column_index);
        Toast.makeText(this, path, 1).show();
    }

得到uri之后，一般需要查询，然后得到结果集，里面就是图片的路径。

case REQ_CODE_PICTURE:  
                Uri uri = data.getData();  
                Cursor cursor = getContentResolver().query(uri, null, null,  
                        null, null);  
                cursor.moveToFirst();  
                try {  
                    srcpath = cursor.getString(1);  

                    Log.i("OnActivtyResult",  
                            "File path :[" + cursor.getColumnCount() + srcpath  
                                    + "]");  
                    //MediaStore.Images.Media.DATA
                    InputStream is = new FileInputStream(cursor.getString(1));  
                    Bitmap bmp = ImageLoader.createBitmap(is, 1);  
                    ivIcon.setImageBitmap(bmp);  
                } catch (Exception e) {  
                    e.printStackTrace();  
                }  
                break;  
            }  

protected String getAbsoluteImagePath(Uri uri) {
        // can post image
        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)
        if (cursor != null) {
            int column_index = cursor
                    .getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
            cursor.moveToFirst();

            return cursor.getString(column_index);
        } else {
            // 如果游标为空说明获取的已经是绝对路径了
            return uri.getPath();
        }
    }