okhttp下载图片

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依赖,别忘记加权限Intetnet

compile 'com.squareup.okio:okio:1.13.0'compile 'com.squareup.okhttp3:okhttp:3.9.0'

xml

<?xml version="1.0" encoding="utf-8"?><RelativeLayout 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:id="@+id/activity_main"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:padding="16dp"    tools:context="com.bwie.rikso.MainActivity">    <Button        android:text="下载图片"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignParentTop="true"        android:layout_alignParentStart="true"        android:id="@+id/button"        android:layout_alignParentEnd="true"        android:layout_alignParentLeft="true"        android:layout_alignParentRight="true" />    <ImageView        android:id="@+id/imageview"        android:paddingTop="40dp"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_below="@id/button"        android:layout_centerVertical="true"        android:layout_centerHorizontal="true"        /></RelativeLayout>

activity类

package com.bwie.rikso;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.os.Bundle;import android.os.Handler;import android.os.Message;import android.support.v7.app.AppCompatActivity;import android.view.View;import android.widget.Button;import android.widget.ImageView;import java.io.IOException;import okhttp3.Call;import okhttp3.Callback;import okhttp3.OkHttpClient;import okhttp3.Request;import okhttp3.Response;public class MainActivity extends AppCompatActivity {    private final String IMAGE_URL = "http://cdnq.duitang.com/uploads/item/201505/20/20150520102944_CiL3M.jpeg";    private static final int IS_SUCCESS = 1;    private static final int IS_FAIL = 0;    private Button button;    private ImageView imageView;    private OkHttpClient client;    private Handler handler = new Handler() {        @Override        public void handleMessage(Message msg) {            switch (msg.what) {                case IS_SUCCESS:                    byte[] bytes = (byte[]) msg.obj;                    Bitmap bitmap = BitmapFactory.decodeByteArray(bytes, 0, bytes.length);                    imageView.setImageBitmap(bitmap);                    break;                case IS_FAIL:                    break;                default:                    break;            }        }    };    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        button = (Button) this.findViewById(R.id.button);        imageView = (ImageView) this.findViewById(R.id.imageview);        button.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                //使用异步get                asyncGet();                //使用同步get  /*              new Thread(new Runnable() {                    @Override                    public void run() {                        synchronizedGet();                    }                }).start();*/            }        });    }    /**     * 异步get,直接调用     */    private void asyncGet() {        client = new OkHttpClient();        final Request request = new Request.Builder().get()                .url(IMAGE_URL)                .build();        client.newCall(request).enqueue(new Callback() {            @Override            public void onFailure(Call call, IOException e) {                e.printStackTrace();            }            @Override            public void onResponse(Call call, Response response) throws IOException {                Message message = handler.obtainMessage();                if (response.isSuccessful()) {                    message.what = IS_SUCCESS;                    message.obj = response.body().bytes();                    handler.sendMessage(message);                } else {                    handler.sendEmptyMessage(IS_FAIL);                }            }        });    }    /**     * 同步写法，需要放在子线程中使用     */    private void synchronizedGet() {        client = new OkHttpClient();        final Request request = new Request.Builder().get()                .url(IMAGE_URL)                .build();        try {            Response response = client.newCall(request).execute();            Message message = handler.obtainMessage();            if (response.isSuccessful()) {                message.what = IS_SUCCESS;                message.obj = response.body().bytes();                handler.sendMessage(message);            } else {                handler.sendEmptyMessage(IS_FAIL);            }        } catch (IOException e) {            e.printStackTrace();        }    }}

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