如何将图像从一个活动发送到另一个活动(使用文件路径) [英] how to send images from one activity to other (using file path)

问题描述

在我的应用中，我正在从列表视图中的url加载图像.我想在下一个活动中显示列表项的onclick.我可以通过意图传递位图，但是考虑到可以通过意图发送的数据的大小限制，我不想这样发送.

In my app, I am loading images from url's in listview. And onclick of list item I want to show it on next activity. I can pass bitmap through intent,But considering the size restriction of data that can be send through intent I dont want to send this way.

任何人都知道将图像从一种活动传递到另一种活动的更好方法.

Anybody knows the better way of passing image from one activity to other.

我听说过将图像存储在文件中并使用intent发送文件路径的消息，但是不知道如何?请告诉我该怎么做?

I have heard about storing image in file and sending filepath using intent But don't know how?Please tell me how can I do it?

listview.setOnItemClickListener(new OnItemClickListener() {



    public void onItemClick(AdapterView<?> arg0, View view, int position,
                        long arg3) {

                    imageview=(ImageView) view.findViewById(R.id.icon);
                    description=(TextView) view.findViewById(R.id.firstLine);
                    rating=(TextView) view.findViewById(R.id.text1);
                    noofDownloads=(TextView) view.findViewById(R.id.text2);
                    noofComments=(TextView) view.findViewById(R.id.text3);
                    imageId=(TextView) view.findViewById(R.id.imageIdText);
                    publishdate=(TextView) view.findViewById(R.id.thirdLine);
                    attribution=(TextView) view.findViewById(R.id.attributionText);
                    Intent intent = new Intent(PicturesList.this, PictureDetail.class);

   String fileName=description.getText().toString();
                fileclass=new FileClass();
                fileclass.saveImage(bitmap,fileName);

                Intent intent = new Intent(PicturesList.this, PictureDetail.class);
                intent.putExtra("imagePath",fileclass.getPath());


                    intent.putExtra("Description",description.getText());
                    intent.putExtra("Rate",rating.getText());
                    intent.putExtra("Downloads",noofDownloads.getText());
                    intent.putExtra("Comments",noofComments.getText());
                    intent.putExtra("PublishTime",publishdate.getText());


    startActivity(intent);

                }
            });

        }

我已经从ListAdapter保存了图像

And I have save images from ListAdapter

在

getview()
{
String fileName=lolpic.getDescription().toString();
                    FileClass fileclass=new FileClass();
                    fileclass.saveImage(bitmap,fileName);

和FileClass.java

and FileClass.java

public class FileClass {

    Picture pic;
    File file;

    public void saveImage(Bitmap myBitmap,String fileName) {

        String root = Environment.getExternalStorageDirectory().toString();
        File myDir = new File(root + "/Pictures");

        String fname = fileName+".png";
        file = new File (myDir, fname);
        if (file.exists ())
        {
            file.delete (); 
        }

        try {
            FileOutputStream out = new FileOutputStream(file);
            //myBitmap.compress(Bitmap.CompressFormat.JPEG, 90, out);

            ByteArrayOutputStream stream = new ByteArrayOutputStream();
            myBitmap.compress(Bitmap.CompressFormat.PNG, 100, stream);
            byte[] byteArray = stream.toByteArray();

            out.write(byteArray);
            out.flush();
            out.close();

        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public String getPath()
    {
        return file.getPath();
    }
}

推荐答案

使用此将图像存储在sdcard中

use this to store image in sdcard

void saveImage() {

String root = Environment.getExternalStorageDirectory().toString();
File myDir = new File(root + "/saved_images");

String fname = "MyImage.jpg";
File file = new File (myDir, fname);
if (file.exists ()) file.delete (); 
try {
       FileOutputStream out = new FileOutputStream(file);
       myBitmap.compress(Bitmap.CompressFormat.JPEG, 90, out);
       out.flush();
       out.close();

} catch (Exception e) {
       e.printStackTrace();
}

}

然后从 file.getpath()

并使用

intent.putExtra("imagePath", file.getpath()); 

通过意图发送图像并使用

to send the image through intent and use

String image_path = getIntent().getStringExtra("imagePath");
Bitmap bitmap = BitmapFactory.decodeFile(image_path);
myimageview.setImageDrawable(bitmap);

在您的接收活动中将图像显示在名为myimageview的imageview上

in your receiving activity to display an image onto the imageview named myimageview

基于注释，看起来应该是myimageview.setImageBitmap(bitmap).没有测试.但是，如果上面的方法不起作用，也可以尝试一下

Based on comments, looks like it should be myimageview.setImageBitmap(bitmap) . Didn't test this. But give a try to this also if above doesn't work

这篇关于如何将图像从一个活动发送到另一个活动(使用文件路径)的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！