OkHttp3网络加载Bitmap到DataBinding中BindingAdapter自定义属性

比眉伴天荒 2023-10-17 18:19 22阅读 0赞

**OkHttp3网络加载Bitmap到DataBinding中BindingAdapter自定义属性**

定义User：

import android.databinding.BaseObservable;
    import android.databinding.ObservableField;
    import android.graphics.Bitmap;
    
    public class User extends BaseObservable {
        public ObservableField<Bitmap> bitmap = new ObservableField<>();
    }

在XML布局中写入User：

其中的app:userImage为自己专门为ImageView自定义的属性。

下面单独为userImage属性增加绑定。Utils.java：

import android.databinding.BindingAdapter;
    import android.graphics.Bitmap;
    import android.widget.ImageView;
    
    public class Utils {
        @BindingAdapter({"userImage"})
        public static void setImageError(ImageView imageView, Bitmap bitmap) {
            imageView.setImageBitmap(bitmap);
        }
    }

接着在上层Java代码使用Okhttp3加载一个网络图片到ImageView的userImage中去：

import android.databinding.DataBindingUtil;
    import android.graphics.Bitmap;
    import android.graphics.BitmapFactory;
    import android.support.v7.app.AppCompatActivity;
    import android.os.Bundle;
    
    import java.io.IOException;
    
    import okhttp3.Call;
    import okhttp3.Callback;
    import okhttp3.OkHttpClient;
    import okhttp3.Request;
    import okhttp3.Response;
    
    public class MainActivity extends AppCompatActivity {
    
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
    
            ActivityMainBinding binding = DataBindingUtil.setContentView(this, R.layout.activity_main);
    
            final User user = new User();
            binding.setUser(user);
    
            String url = "http://avatar.csdn.net/9/7/A/1_zhangphil.jpg";
    
            OkHttpClient client = new OkHttpClient();
            Request request = new Request.Builder()
                    .url(url)
                    .build();
    
            client.newCall(request).enqueue(new Callback() {
                @Override
                public void onFailure(Call call, IOException e) {
    
                }
    
                @Override
                public void onResponse(Call call, Response response) throws IOException {
                    byte[] bytes = response.body().bytes();
                    Bitmap bitmap = BitmapFactory.decodeByteArray(bytes, 0, bytes.length);
                    user.bitmap.set(bitmap);
                }
            });
        }
    }

.gradle添加的okhttp3引用：

implementation 'com.squareup.okhttp3:okhttp:3.9.1'