java - Android 将位图设置为 Imageview

Question

嗨，我有一个 Base64 格式的字符串。我想将其转换为位图，然后将其显示为 ImageView。这是代码：

ImageView user_image;
Person person_object;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.user_profile_screen);

    // ImageViews
    user_image = (ImageView) findViewById(R.id.userImageProfile);

    Bundle data = getIntent().getExtras();
    person_object = data.getParcelable("person_object");
    // getPhoto() function returns a Base64 String
    byte[] decodedString = Base64.decode(person_object.getPhoto(), Base64.DEFAULT);

    Bitmap decodedByte = BitmapFactory.decodeByteArray(decodedString, 0, decodedString.length);
    user_image.setImageBitmap(decodedByte);
    }

此代码成功获取 Base64 字符串，我没有收到任何错误。但它不显示图像。可能是什么问题？谢谢

score 58 · Accepted Answer

请试试这个：

byte[] decodedString = Base64.decode(person_object.getPhoto(),Base64.NO_WRAP);
InputStream inputStream  = new ByteArrayInputStream(decodedString);
Bitmap bitmap  = BitmapFactory.decodeStream(inputStream);
user_image.setImageBitmap(bitmap);

score 6 · Accepted Answer

有一个名为Picasso的库，它可以有效地从 URL 加载图像。它还可以从文件中加载图像。

例子：

将 URL 加载到 ImageView 中而不生成位图：

Picasso.with(context) // Context
       .load("http://abc.imgur.com/gxsg.png") // URL or file
       .into(imageView); // An ImageView object to show the loaded image

通过生成位图将 URL 加载到 ImageView 中：

Picasso.with(this)
       .load(artistImageUrl)
       .into(new Target() {
           @Override
           public void onBitmapLoaded(final Bitmap bitmap, Picasso.LoadedFrom from) {
               /* Save the bitmap or do something with it here */

               // Set it in the ImageView
               theView.setImageBitmap(bitmap)
           }

           @Override
           public void onBitmapFailed(Drawable errorDrawable) {

           }

           @Override
           public void onPrepareLoad(Drawable placeHolderDrawable) {

           }
       });

毕加索还有更多选择。这是文档。

score 6 · Accepted Answer

    //decode base64 string to image
    imageBytes = Base64.decode(encodedImage, Base64.DEFAULT);
    Bitmap decodedImage = BitmapFactory.decodeByteArray(imageBytes, 0, imageBytes.length);
    image.setImageBitmap(decodedImage);

  //setImageBitmap is imp

score 5 · Accepted Answer

这段代码适用于我

 ImageView carView = (ImageView) v.findViewById(R.id.car_icon);

                            byte[] decodedString = Base64.decode(picture, Base64.NO_WRAP);
                            InputStream input=new ByteArrayInputStream(decodedString);
                            Bitmap ext_pic = BitmapFactory.decodeStream(input);
                            carView.setImageBitmap(ext_pic);

java - Android 将位图设置为 Imageview

4 回答 4

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