Android/Java网络加载框架Retrofit（二）load bitmap into ListView

package zhangphil.http;

import android.app.ListActivity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.util.Log;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ImageView;

import java.util.ArrayList;

import okhttp3.ResponseBody;
import retrofit2.Call;
import retrofit2.Callback;
import retrofit2.Response;
import retrofit2.Retrofit;
import retrofit2.http.GET;
import retrofit2.http.Path;

public class MainActivity extends ListActivity {
private MyRetrofitService mRetrofitService;
private ArrayList<Call> mCalls = new ArrayList<>();

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);

Retrofit mRetrofit = new Retrofit.Builder()
.baseUrl("https://www.baidu.com/")
.build();

mRetrofitService = mRetrofit.create(MyRetrofitService.class);

ArrayAdapter mArrayAdapter = new ArrayAdapter(this, 0) {
@NonNull
@Override
public View getView(int position, @Nullable View convertView, @NonNull ViewGroup parent) {
ImageView imageView = new ImageView(getContext());
setBitmap("bd_logo1.png", imageView);
return imageView;
}

@Override
public int getCount() {
return 10;
}
};

setListAdapter(mArrayAdapter);
}

private void setBitmap(String picName, final ImageView imageView) {
final Call mCall = mRetrofitService.getImagesByName(picName);
mCall.enqueue(new Callback<ResponseBody>() {
@Override
public void onResponse(Call<ResponseBody> call, Response<ResponseBody> response) {
try {
Log.d("请求的网络链接", String.valueOf(mCall.request().url()));

byte[] bytes = response.body().bytes();
Bitmap bmp = BitmapFactory.decodeByteArray(bytes, 0, bytes.length);

imageView.setImageBitmap(bmp);
} catch (Exception e) {
e.printStackTrace();
}
}

@Override
public void onFailure(Call<ResponseBody> call, Throwable t) {
t.printStackTrace();
}
});

mCalls.add(mCall);
}

private interface MyRetrofitService {
@GET("img/{picName}")
Call<ResponseBody> getImagesByName(@Path("picName") String picName);
}

@Override
protected void onDestroy() {
super.onDestroy();

for (Call call : mCalls) {
call.cancel();
}
}
}