一分钟OkHttpClient编写请求网络图片

我敲好几遍啦才能一分钟完成

代码思路还是比较清晰简单的,不做过多的解释

package fengxing.primer.okhttpclient;

import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;

import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.Toast;

import java.io.IOException;

import okhttp3.Call;
import okhttp3.Callback;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.Response;

/**
 * 1.使用之前记得添加网络权限
 *      <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
 *      <uses-permission android:name="android.permission.INTERNET"></uses-permission>
 * 2.记得添加依赖: okclient框架
 *      implementation 'com.squareup.okhttp3:okhttp:3.2.0'
 * 3.当然,调试要开启网络数据
 */

public class MainActivity extends AppCompatActivity {

    private Button button;
    private ImageView image;
    private OkHttpClient client;
    private final String URL = "https://pic.liesio.com/2019/10/14/4403745f835d8.jpg";
    private static final int GET_IMAGE_BYTE = 1;
    private static final int NETWORK_ERRO = 2;
    private Toast toast;


    private Handler handler = new Handler(){
        @Override
        public void handleMessage(@NonNull Message msg) {
            super.handleMessage(msg);
            dealMessage(msg);
        }
    };

    private void dealMessage(@NonNull Message msg) {
        switch (msg.what){
            case GET_IMAGE_BYTE:
            {
                byte[] imageBytes = (byte[]) msg.obj;
                Bitmap bitmap = BitmapFactory.decodeByteArray(imageBytes,0,imageBytes.length);
                image.setImageBitmap(bitmap);
            }
                break;
            case NETWORK_ERRO:
            {
                toast.makeText(MainActivity.this,"请检查网络",Toast.LENGTH_LONG).show();
            }
                break;
                default:
                    break;
        }
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.one);

        initView();
    }


    private void initView() {
        button = findViewById(R.id.button);
        image = findViewById(R.id.image);

        initViewClick();
    }

    private void initViewClick() {
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                if (Utils.internetIsOK(MainActivity.this)) {
                    requstImage();
                }else{
                    Message message = new Message();
                    message.what = NETWORK_ERRO;
                    handler.sendMessage(message);
                }
            }
        });

    }

    private void requstImage() {
        client = new OkHttpClient();
        Request request = new Request.Builder().get().url(URL).build();
        
        //这个请求方法是直接返回字节数组的,还有一个返回字符串的指向方法有点不一样
        client.newCall(request).enqueue(new Callback() {
            @Override
            public void onFailure(Call call, IOException e) {
                new Throwable();
            }

            @Override
            public void onResponse(Call call, Response response) throws IOException {
                if (response.isSuccessful()){
                    Message message = new Message();
                    message.what = GET_IMAGE_BYTE;
                    message.obj = response.body().bytes();
                    handler.sendMessage(message);
                }else{
                    new Throwable();
                }

            }
        });
    }
}

最后

以上就是彩色导师为你收集整理的一分钟OkHttpClient编写请求网络图片的全部内容，希望文章能够帮你解决一分钟OkHttpClient编写请求网络图片所遇到的程序开发问题。

如果觉得靠谱客网站的内容还不错，欢迎将靠谱客网站推荐给程序员好友。