Android 如何从 png 文件加载 ImageView？
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How to load an ImageView from a png file?
提问by Peter vdL
I take a picture with the camera using
我用相机拍照
Intent intent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE );
startActivityForResult( intent, 22 );
When the activity completes, I write the bitmap picture out to a PNG file.
活动完成后，我将位图图片写入 PNG 文件。
java.io.FileOutputStream out = openFileOutput("myfile.png", Context.MODE_PRIVATE);
bmp.compress(Bitmap.CompressFormat.PNG, 90, out);
That goes OK, and I can see the file is created in my app private data space.
没问题，我可以看到文件是在我的应用程序私有数据空间中创建的。
I'm having difficulty when I later want to display that image using an ImageView.
当我以后想使用 ImageView 显示该图像时遇到了困难。
Can anyone suggest code to do this?
任何人都可以建议代码来做到这一点吗？
If I try to create a File with path separators in, it fails. If I try to create a Uri from a name without separators, that fails.
如果我尝试创建一个带有路径分隔符的文件，它会失败。如果我尝试从没有分隔符的名称创建 Uri，则会失败。
I canopen the file OK using:
我可以使用以下命令打开文件：
java.io.FileInputStream in = openFileInput("myfile.png");
But that doesn't give me the Uri I need to set an image with
但这并没有给我设置图像所需的 Uri
iv.setImageURI(u)
Summary: I have the picture in a png file in private app data. What's the code to set that into an ImageView?
摘要：我在私人应用程序数据中的 png 文件中有图片。将其设置为 ImageView 的代码是什么？
Thanks.
谢谢。
回答by CommonsWare
Try BitmapFactory.decodeFile()and then setImageBitmap()on the ImageView.
试试BitmapFactory.decodeFile()然后setImageBitmap()就可以了ImageView。
回答by Apc
Also possible:
也可以：
java.io.FileInputStream in = openFileInput("myfile.png");
iv.setImageBitmap(BitmapFactory.decodeStream(in));
回答by user2107276
iv.setImageURI(Uri.fromFile(in));
回答by Bernd
Why not this way:
为什么不这样：
ImageView MyImageView = (ImageView)findViewById(R.id.imageView1);
Drawable d = Drawable.createFromPath( PATH TO FILE );
MyImageView.setImageDrawable(d);
回答by Nauman Khalid
bitmap = BitmapFactory.decodeFile(imageInSD);
