okhttp3从服务器获取图片

<?xml version="1.0" encoding="utf-8"?><android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:app="http://schemas.android.com/apk/res-auto"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    tools:context="success.xiaoyu.okhttp3.MainActivity">   <Button       android:id="@+id/test"       android:layout_width="match_parent"       android:layout_height="wrap_content"       android:text="Wonder"       android:textAllCaps="false"/>    <ImageView        android:id="@+id/image"        android:layout_width="match_parent"        android:layout_height="match_parent" />android.support.constraint.ConstraintLayout>

package success.xiaoyu.okhttp3;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.os.Handler;import android.os.Message;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.view.View;import android.widget.Button;import android.widget.ImageView;import java.io.IOException;import java.io.InputStream;import okhttp3.Call;import okhttp3.Callback;import okhttp3.OkHttpClient;import okhttp3.Request;import okhttp3.Response;public class MainActivity extends AppCompatActivity {    private Button button;    private ImageView imageView;    private Handler handler = new Handler(){        public void handleMessage(Message msg) {            Bitmap bitmap = (Bitmap)msg.obj;            imageView.setImageBitmap(bitmap);//将图片的流转换成图片        }    };    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        button = (Button)findViewById(R.id.test);        imageView = (ImageView)findViewById(R.id.image);        button.setOnClickListener(new View.OnClickListener() {            public void onClick(View view) {                OkHttpClient okHttpClient = new OkHttpClient();                Request request = new Request.Builder()                                .url("http://115.159.217.226/xy.png")                                 .build();                okHttpClient.newCall(request).enqueue(new Callback() {                    public void onFailure(Call call, IOException e) {                    }                    public void onResponse(Call call, Response response) throws IOException {                        InputStream inputStream = response.body().byteStream();//得到图片的流                        Bitmap bitmap = BitmapFactory.decodeStream(inputStream);                        Message msg = new Message();                        msg.obj = bitmap;                        handler.sendMessage(msg);                    }                });            }        });    }}

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